Document:

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                                                                   EXHIBIT 10.17

                       AGREEMENT FOR PURCHASE OF PRODUCTS

                                     BETWEEN

                           ACCELERATED NETWORKS, INC.

                                       AND

              SIEMENS INFORMATION AND COMMUNICATION NETWORKS, INC.

                                JANUARY 21, 1999

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                       AGREEMENT FOR PURCHASE OF PRODUCTS

                                    CONTENTS

PARTIES AND SIGNATURES

<TABLE>
<S>                   <C>
ARTICLE I              DEFINITIONS

                       1.0        TERMS DEFINED

ARTICLE II             CONFIDENTIALITY PROVISIONS

                       2.0        CONFIDENTIAL INFORMATION
                       2.1        DISCLOSURE BETWEEN THE PARTIES
                       2.2        CONFIDENTIAL INFORMATION OF THIRD PARTIES
                       2.3        RETURN OF CONFIDENTIAL INFORMATION

ARTICLE III            PRODUCT

                       3.0        PRODUCT DESCRIPTION
                       3.1        INCOMPATIBILITIES
                       3.2        SPECIAL PRODUCTS
                       3.3        PRODUCT CHANGES
                       3.4        PRIVATE LABEL
                       3.5        CUSTOM SOFTWARE

ARTICLE IV             PRICES

                       4.0        PRODUCT AVAILABILITY FOR PURCHASE
                       4.1        PRICE WARRANTY
                       4.2        PRICE LIST
                       4.3        FORECAST
                       4.4        DISCOUNTS
                       4.5        PURCHASE COMMITMENT

ARTICLE V              PURCHASING TERMS AND CONDITIONS

                       5.0        ORDER SERVICING
                       5.1        CHANGE ORDER
                       5.2        SCHEDULE COMMITMENTS
                       5.3        PACKING
                       5.4        SHIPPING
                       5.5        RECEIVING AND INSPECTION
                       5.6        TITLE AND RISK OF LOSS
</TABLE>

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<TABLE>
<S>                   <C>
ARTICLE VI             PAYMENT

                       6.0        PAYMENT TERMS
                       6.1        INVOICING

ARTICLE VII            WARRANTY

                       7.0        WARRANTY
                       7.1        YEAR 2000 COMPLIANCE WARRANTY
                       7.2        WARRANTY EXCLUSIONS

ARTICLE VIII           REPAIR SERVICE

                       8.0        REPAIRS NOT COVERED UNDER WARRANTY

ARTICLE IX             TRAINING

                       9.1               TRAINING

ARTICLE X              DOCUMENTATION

                       10.0       SPECIFICATIONS OR DRAWINGS
                       10.1       DOCUMENTATION
                       10.2       USE OF INFORMATION
                       10.3       REPRODUCTION OF DOCUMENTATION

ARTICLE XI             COMPLIANCE

                       11.0       RADIO FREQUENCY ENERGY STANDARDS
                       11.1       REGISTRATION
                       11.2       TOXIC SUBSTANCES AND HAZARDOUS MATERIAL
                       11.3       COMPLIANCE WITH LAWS
                       11.4       COMPLIANCE WITH CERTIFICATION TESTS REQUIRED
                                   BY NORTH AMERICAN PUBLIC NETWORK PROVIDERS

ARTICLE XII            TERM AND TERMINATION

                       12.0       TERM OF AGREEMENT
                       12.1       TERMINATION OF AGREEMENT

ARTICLE XIII           SOFTWARE

                       13.0       RIGHTS TO SOFTWARE
                       13.1       SOFTWARE ESCROW

ARTICLE XIV            GENERAL PROVISIONS

                       14.0       TRANSFERABILITY
                       14.1       DISCLAIMER OF AGENCY
</TABLE>

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<TABLE>
<S>                              <C>
                       14.2       PUBLICITY
                       14.3       NOTICES
                       14.4       GOVERNING LAW
                       14.5       ARBITRATION
                       14.6       NON-WAIVER
                       14.7       EXECUTION OF FURTHER DOCUMENTS
                       14.8       OTHER REMEDIES
                       14.9       EFFECT OF HEADINGS
                       14.10      PATENT AND OTHER PROPRIETARY RIGHTS
                                  INFRINGEMENT INDEMNIFICATION
                       14.11      MARKINGS
                       14.12      CONTINGENCY
                       14.13      DEVELOPMENTS BY SIEMENS
                       14.14      VALIDITY
                       14.15      LIMITATION OF LIABILITY
</TABLE>

ATTACHMENTS:

Attachment A             Product Structure
Attachment B             Furnished and Related Materials
Attachment C             Product Specifications
Attachment D             Non-Disclosure Agreements
Attachment E             Price Lists
Attachment F             Forecast
Attachment G             Escrow Agreement

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                       AGREEMENT FOR PURCHASE OF PRODUCTS

        THIS AGREEMENT, having an Effective Date of January 21st, 1999, is
hereby entered into between ACCELERATED NETWORKS, INC., a California
corporation, having a principal place of business at 301 Science Drive,
Moorpark, California 93021 (hereinafter referred to as Company), and SIEMENS
INFORMATION AND COMMUNICATION NETWORKS, INC., a Delaware corporation, having a
principal place of business at 900 Broken Sound Parkway, Boca Raton, Florida
33487 (hereinafter referred to as Siemens).

        WHEREAS, Siemens desires to purchase Products (hereinafter described)
and thereafter desires to have Product delivered for Siemens' use in Siemens
products that may be offered for resale to third parties, and

        WHEREAS, Company is interested in selling product to Siemens.

        NOW THEREFORE, in consideration of the mutual covenants contained
herein, it is agreed as follows:

        (a)     The Articles and Attachments contained in this Agreement
                constitute the entire agreement between the Parties;

        (b)     No modifications or waiver of any of the provisions, or any
                future representation, promise, or addition shall be binding
                upon the Parties unless agreed to in writing;

        (c)     This Agreement supersedes and cancels any prior agreements
                between the parties with respect to the subject matter contained
                herein.

        IN WITNESS WHEREOF, the Parties hereto have as of the Effective Date
duly executed this Agreement, including Attachments A through G which are
incorporated herein and made a part hereof, by the respective representatives
thereunto duly authorized.

ACCELERATED NETWORKS, INC.                    SIEMENS INFORMATION AND
                                              COMMUNICATIONS NETWORKS, INC.

        /s/ Suresh Nihalani                           /s/ Fred From
        ---------------------------                   -------------------------
By:     Suresh Nihalani                       By:     Fred From
Title:  President & CEO                       Title:  President & CEO
Date:   January 17, 1999                      Date:   January 20, 1999

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                                    ARTICLE I

                                   DEFINITIONS

1.0     TERMS DEFINED

        As used in this Agreement, the following terms shall have the following
        respective meanings (in singular or plural usage, as indicated by the
        context).

1.1     "Catalog" means any document that describes Company Products that are
        generally available for sale through normal distribution channels.

1.2     "Customer" means an end-user of Product who, at the time of acquisition
        of the Product, has taken possession of the Product for its end use and
        does not intend to further distribute the Product.

1.3     "Effective Date" of this Agreement means the date first written above.

1.4     "Parties" means Company and Siemens.

1.5     "Product" means the Product(s) specified in Attachment A including all
        generally sold, (i) standard spare parts, (ii) improvements, upgrades,
        corrections, modifications, alterations, revisions, or updates, to the
        specified Products made by Company during the Term of this Agreement.

1.6     "Specifications" means the technical specifications for the Products,
        including, but not limited to Functional Requirements Specifications,
        User Manuals, Performance Specifications and Configuration Guidelines as
        set forth in Attachment C and revised by the Company from time to time.

1.7     "Related Materials" means all and any kind of information, whether or
        not in documentary form, used or useful in or relating to, the use,
        maintenance or marketing of Product including, but not limited to system
        manuals, program manuals, test and diagnostic information, maintenance
        information, and operating procedures, as more specifically set forth in
        Attachment B.

1.8     "Software" means the computer instructions, including firmware, in
        machine-readable language provided as part of a Product or comprising a
        Product.

1.9     "Source Code" means human-readable source statements for the Software
        including, without limitation, program listings, data definition models,
        indices, structure tables, system flow charts, program flow charts,
        defined terms, file layouts and program narratives.

1.10    "Spares" means any sub assembly generally provided by Company for field
        replacement for Products including, but not limited to, components,
        boards, fasteners, power supplies,

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        cables, wiring, casings and other associated materials as more
        specifically specified in Attachment A.

1.11    "Special Product" means any special feature or capability that is not a
        part of the Company's generally offered Product, not contained in the
        general Product Catalog and Price List, and generally built-to-order.
        Special Products covered by this Agreement shall be specified in
        Attachment A.

1.12    "Standard Price List" means Company's published listing of its standard
        prices for which Company will sell its Products as such list is updated
        from time to time by the Company as stipulated in Article IV.

1.13    "Siemens Discounted Price List" means the price list at which Siemens
        will purchase the Company's product.

1.14    "Term of this Agreement" means the term of this Agreement, including any
        renewal periods, as specified in Section 12.0.

                                   ARTICLE II

                           CONFIDENTIALITY PROVISIONS

2.0     CONFIDENTIAL INFORMATION

        For the purpose of this Agreement, "Confidential Information" shall mean
        any information and data of a confidential nature, including, but not
        limited to, proprietary, developmental, technical, marketing, sales,
        operating, performance, cost, know-how, business and process
        information, computer programming techniques, and all record bearing
        media containing or disclosing such information and techniques provided
        such information is conspicuously marked as being Confidential.

2.1     DISCLOSURE BETWEEN THE PARTIES

        2.1.1   All Confidential Information exchanged between the Parties
                pursuant to this Agreement:

                (a)     shall not be distributed, disclosed, or disseminated in
                        any way or form by the receiving Party to anyone except
                        its own employees, including Siemens AG, who have a
                        reasonable need to know such Confidential Information to
                        perform such Party's obligations hereunder;

                (b)     shall be treated by the receiving Party with the same
                        degree of care to avoid disclosure to any third party as
                        is used with respect to the receiving Party's own
                        information of like importance which is to be kept
                        secret. The receiving Party shall be liable for
                        disclosure of Confidential Information of the disclosing
                        Party only if such care is not used. The

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                        burden shall be upon the receiving Party to show that
                        such care was used; and

                (c)     shall not be used by the receiving Party for its own
                        purpose, except as otherwise expressly stated herein,
                        without the express written permission of the disclosing
                        Party; and

                (d)     shall remain the property of and be returned to the
                        disclosing Party (along with all copies, embodiments and
                        derivatives thereof) within thirty (30) days of receipt
                        by the receiving Party of a written request from the
                        disclosing Party setting forth the Confidential
                        Information to be returned.

        2.1.2   The obligations of the above paragraph shall not apply, however,
                to any information which:

                (a)     is already in the public domain or becomes available to
                        the public through no breach of this Agreement by the
                        receiving Party;

                (b)     was in the receiving Party's possession prior to receipt
                        from the disclosing Party as proven by the receiving
                        Party's written records;

                (c)     is received independently on a non-confidential basis
                        from a third party free to disclose such information to
                        the receiving Party; or

                (d)     is independently developed by the receiving Party as
                        proven by its written records prior to receipt from the
                        disclosing Party; or

                (e)     is the subject of subpoena or court order.

        2.1.3   Either Party shall have the right to refuse to accept any
                Confidential Information under this Agreement.

        2.1.4   Siemens shall be free to use and distribute Products and Related
                Materials in which Company's Confidential Information is
                embedded and disclosed; provided, Siemens shall not distribute
                or disclose any Related Materials which are not meant to be
                generally distributed, including without limitation, test,
                diagnostic and maintenance information and which are
                conspicuously marked "Confidential".

        2.1.5   No license to the receiving Party, under any trademark, patent
                or copyright, or applications which are now or may thereafter be
                owned by the disclosing Party, is either granted or implied by
                the conveying of Confidential Information to the receiving
                Party.

        2.1.6   Each Party shall advise its employees, personnel, agents, staff
                and representatives of the terms hereof and require them to
                observe the terms and conditions hereof.

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2.2     CONFIDENTIAL INFORMATION OF THIRD PARTIES

        Neither party shall communicate or otherwise disclose to the other,
        during the Term of this Agreement, confidential or proprietary
        information of third parties unless such third parties have consented to
        such disclosure.

2.3     RETURN OF CONFIDENTIAL INFORMATION

        Upon request of the disclosing Party, copies, derivatives and
        embodiments of the disclosing Party's Confidential Information shall be
        promptly returned to the disclosing Party by the receiving Party, except
        to the extent such information is required by Siemens to perform its
        support obligations with respect to the Products.

                                  ARTICLE III

                                     PRODUCT

3.0     PRODUCT DESCRIPTION

        Company shall sell Products to Siemens pursuant to this Agreement,
        provided no Software shall be sold, but shall be licensed to Siemens
        pursuant to all the terms and conditions of this Agreement.

        Company shall make available for Siemens' purchase (in the case of
        hardware) and or license (in the case of Software), all improvements,
        upgrades, enhancements, corrections, modifications, alterations,
        revisions, updates, made to Product and Related Materials during the
        Term of this Agreement on terms substantially as provided herein
        provided that none of the foregoing shall include any products,
        technology, information or the like developed or resulting from
        Company's work for other parties and such are not made generally
        available for sale by the Company.

3.1     INCOMPATIBILITIES

        During the Term, Company agrees to notify Siemens in writing of
        technical changes, enhancements, alterations, improvements or other
        modifications to the Products that could render such altered Product
        incompatible with previously provided Products or which would materially
        alter the manner in which such modified Products interface with Siemens'
        equipment using Siemens' previously specified interfaces. Such notice
        shall be provided at least ninety (90) days prior to delivery to allow
        Siemens, in the exercise of prompt due diligence, to test and determine
        any necessary modifications to its equipment or to the Product to ensure
        the continued marketability of the modified Product by Siemens, prior to
        delivery of Product with such changes, enhancements, alterations,
        improvements or other modifications.

        The Company and Siemens agree to establish a testing strategy that will
        minimize the potentiality of Product incompatibility.

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3.2     SPECIAL PRODUCTS

        Special Products may be requested, quoted and developed from time to
        time and added to this Agreement. Such Special Product, and associated
        prices shall only become part of this Agreement on written approval of
        both Parties. Once a Special Product becomes available in company's
        Catalog, it shall no longer be considered a Special Product.

3.3     PRODUCT CHANGES

        3.3.1   Company shall advise Siemens in writing of all changes to
                Product that impact (a) reliability, (b) the Specifications, or
                (c) form, fit or function in accordance with the procedures
                specified herein.

        3.3.2   Company may at any time make changes in the Product, or modify
                the drawings and Specifications relating thereto, or substitute
                Product of later design to fill an order, provided the changes,
                modifications or substitutions under normal and proper use do
                not impact upon the Product's (a) reliability, (b) the
                Specifications, or (c) form, fit or function. For such changes,
                Company shall notify Siemens in writing not later than thirty
                (30) days after such change has been implemented.

                Except in the case of Mandatory Changes, Company shall send
                copies of a written change modification to Siemens ninety (90)
                days prior to the effective date of each change to Product which
                impacts on form, fit, function, reliability, or Product
                Specifications. Company shall provide Siemens' with samples of
                the changed Product for testing. Siemens will either return the
                Product to the Company or purchase the Product at Siemens
                discount price within 30 days.

                "Mandatory Changes" are those changes required to correct an
                extremely unsatisfactory condition requiring immediate action,
                such as changes for safety or to meet existing Product
                Specifications. In such cases Company shall promptly send
                Siemens a written change notification. Company shall provide
                with each change notification the following information: (a)
                Product change number; (b) a detailed description of the change;
                (c) reason for the change; (e) description of the impact of the
                change; (f) price impact, if any; (g) proposed date for changes.
                Company shall provide Siemens with samples of the changed
                Product for testing.

                In the event that Siemens reasonably rejects such change to a
                Product, Siemens shall advise Company of such determination as
                soon as reasonably possible, but in no event more than thirty
                (30) days from the date on which the sample of the changed
                Product was received by Siemens. Siemens' failure to so notify
                Company shall be deemed an acceptance of the change. Company
                shall not furnish any such changed Products on any of Siemens
                orders if the change has been reasonably rejected.

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3.4     PRIVATE LABEL

        3.4.1   Siemens intends to private label and market any Products
                purchased hereunder under Siemens own trade names and trade
                dress. The Company may agree to private label such Products,
                provided that (a) the costs incurred by Company for changes to
                Products and for altered materials mandated ` by such private
                labeling shall be reimbursed to Company by Siemens, and that (b)
                the parties shall mutually agree to any other relevant terms and
                conditions of such private label services, including the
                procedure for reimbursement of costs associated with private
                labeling.

        3.4.2   Company may, in good faith, order private label special
                materials in quantities in excess of Siemens' orders, based upon
                Siemens' forecasts, and Siemens shall reimburse Company for all
                such materials and reasonable inventory costs associated, if
                such materials are not utilized in Products for Siemens by the
                end of the Annual Delivery Period as established in 4.3.

3.5     CUSTOM SOFTWARE

        3.5.1   Custom Software as used herein shall mean Software requested by
                Siemens and developed exclusively by Company for Siemens.
                Siemens and Company shall mutually agree on the process for
                contracting the development of Custom Software, payment terms
                and the rights of the Parties to such custom Software prior to
                the commencing of development work by Company on a request by
                request basis.

                                   ARTICLE IV

                                     PRICES

4.0     PRODUCT AVAILABILITY FOR PURCHASE

        Company agrees to have the Product and Related Materials available for
        purchase and/or license, in the case of Software, by Siemens during the
        Term of this Agreement at prices as set forth herein and with delivery
        lead times reasonable with respect to similar Products of Company.
        Company agrees that, when the Product is considered "generally
        available" in the marketplace, the normal delivery performance will be
        45 days after order acknowledgment or better for forecasted Product, so
        long as Siemens is generally ordering in accordance with its forecasts.

        Company agrees that during the Term of this Agreement it shall, if
        requested by Siemens and at Siemens expense as mutually agreed, maintain
        in inventory units of Product available for delivery to Siemens above
        and beyond that being manufactured in response to Siemens' purchase
        orders and scheduled for delivery hereunder. Siemens may order and take
        delivery of such inventory in the event Siemens requires additional
        quantities for sale or shipment. In the event of anticipated labor
        disturbances, shortages of materials, or

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        other conditions or events which could adversely interrupt deliveries by
        Company hereunder, Company agrees to advise Siemens as soon as
        reasonably possible and at Siemens' request, use commercially reasonable
        efforts to manufacture, sell, and deliver to Siemens, in advance,
        quantities originally scheduled for delivery during such period when
        such interruptions are anticipated.

        The site and facilities where Company shall manufacture the Product is
        Company's facility in Moorpark, CA or at other sites of which Company
        shall advise Siemens.

        Upon advance notice, with the concurrence of the Company which will not
        be unreasonably withheld, and subject to the Confidentiality provisions
        contained herein, Siemens employees, agents or representatives may visit
        Company's manufacturing premises during normal business hours to observe
        Company's performance of its obligations under this Agreement.

4.1     PRICE WARRANTY

        Subject to Section 4.2, during the Term of this Agreement, the terms,
        conditions and prices for Products and Related Materials under which
        Siemens may purchase the Product shall be no less favorable to Siemens
        than those which Company provides to any other OEM purchasing the same
        Product, or Product with similar functionality, in like quantities over
        like time periods under like terms, conditions, delivery times and under
        similar non-cancelable purchase commitments.

        Company agrees that the list prices established for the sale of the
        Product to Siemens are reasonable with respect to similar Products of
        Company.

        Company and Siemens mutually agree to establish regular meetings to
        assess performance under the Agreement and to mutually resolve issues or
        problems that might arise. These meetings should be conducted quarterly
        and whenever required.

        Company will, in concert with Siemens, periodically assess the fair
        market value of the Product and may adjust the price of the Product
        according to finding of such assessments.

4.2     PRICE LIST

        The Company's Standard Price List and the Siemens Discounted Price List
        for Product, Spares, and Special Products, during the Term of this
        Agreement are specified in Attachment E. Except as set forth in Section
        4.2, the prices contained in the Siemens Discounted Price List in
        Attachment E shall not be increased except as mutually agreed in writing
        by the Parties. Company will notify Siemens prior to any changes in the
        Company's Standard Price List. Whenever a change to the Company's
        Standard Price List results in a price reduction, Company will update
        the Siemens Discounted Price List to reflect such price reduction(s) in
        the Company's Standard Price List. Products added to the Agreement for
        purchase or license shall be at prices as mutually agreed at the time of
        adding to the price list.

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        Prices under this Agreement are based upon Siemens' forecast of a
        purchase level of $ 38,000,000 over the first three years of the
        Agreement, of which no less than 10% will be purchased prior to
        September 30, 1999, 30% between October 1, 1999 and September 30, 2000
        and 60% between October 1, 2000 and September 30, 2001. In the event
        that Siemens fails to purchase Products in the quantities as set forth
        herein, Company shall be entitled, at its sole discretion, to adjust
        Siemens' prices for Products on a going forward basis.

4.3     FORECAST

        Siemens shall forecast its anticipated Product requirements for the Term
        of this Agreement. An initial first year's forecast will be part of this
        Agreement, as shown in Attachment F. The forecasts will be scheduled
        according to the Siemens' fiscal year which is based on a 12 month
        period ending in September of each year. This period of time constitutes
        the Annual Delivery Period

        Forecasted quantities and delivery dates are subject to change and do
        not constitute a binding commitment to buy on the part of Siemens.
        However, Siemens shall, on an on-going monthly basis, update the one
        year forecast using its commercially reasonable best effort to provide
        an accurate forecast of demand for the succeeding 12 month period.

        Such forecasts are for information and planning purposes only. However,
        Siemens shall make every reasonable effort to comply with its forecasts.
        For each Annual Delivery Period, Siemens will provide the Company with
        its forecast of purchases for that period. The forecast will indicate
        expected and worst case scenarios. In the event that Siemens' orders
        vary from Forecast, Company shall have the right to reduce or increase
        forecast quantities, as applicable, and, while Company shall use its
        commercially reasonable best efforts to accept all orders and meet lead
        times, it shall not be obligated to accept orders for quantities in
        excess of those forecast or which are inconsistent with Siemens'
        previous purchase levels. Furthermore, beginning with the calendar
        quarter ending March 31, 2000, if Siemens fails to achieve at least
        seventy-five percent (75%) of the applicable quarterly forecasted
        purchase amount for two consecutive prior calendar quarters, Accelerated
        shall be entitled to terminate this Agreement pursuant to Section 12.0;
        provided, Accelerated must exercise such right to terminate within
        thirty (30) days of the last applicable quarter or be required to wait
        until the end of the next applicable quarter.

4.4     DISCOUNTS

        4.4.1   Subject to Section 4.2, Company agrees to sell Product to
                Siemens at discounts from Company's Standard Price List. The
                Siemens discounted price is as shown in the Siemens Discounted
                Price List in Attachment E.

                Spare part prices and discounts are specified in Attachment E.

        4.4.2   Special Products prices will be individually quoted, Special
                Products may be added to the Price List if mutually agreed to in
                writing by both Parties.

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        4.4.3   All prices are quoted in U.S. dollars and are F.O.B. Company
                factory and do not include, sales or other taxes, import duties,
                special packaging, shipping or insurance charges. Such
                additional charges shall be separately stated on the applicable
                invoice and paid by Siemens.

4.5     PURCHASE COMMITMENT

        Within 15 days of execution of this Agreement, Siemens will place an
        order to meet Siemens' estimation of its requirements for training, demo
        and beta testing. These Products will be purchased with a special
        discount for non- revenue producing Product as established in ATTACHMENT
        E.

        Within thirty (30) days of execution of this Agreement, Siemens will
        place an order for equipment on the Company that will be used for
        Customer sales. This value of this order will be $500,000. The delivery
        of Product for this order may be rescheduled per the terms and
        conditions of this Agreement with the provisions that in the absence of
        "Extenuating Circumstances" as set forth below, (a) the order is
        non-cancelable and (b) payment must be made no later than October 1,
        1999. Extenuating Circumstances will apply if Company fails to meet its
        obligations under this Agreement in terms of Product features, Product
        availability, Product quality, Product delivery, or warranty and
        maintenance support. In such cases, Siemens may, at its sole discretion,
        notify the Company in writing of the Company's failure to perform and
        rescind Siemens' remaining obligation under the purchase order.

                                   ARTICLE V

                         PURCHASING TERMS AND CONDITIONS

5.0     ORDER SERVICING

        Siemens in its sole discretion may purchase Product, Special Products,
        and Spares by issuing written purchase orders to Company. Acceptance by
        Company of Siemens order under the terms and conditions of this
        Agreement shall be indicated by written acceptance. Company agrees to
        acknowledge all purchase orders within two (2) business days and to
        accept all valid purchase orders within five (5) business days.

        So long as the original order complies with the Agreement, the Company
        must accept the order and deliver the Product.

        Any additional or different terms or conditions expressed by Siemens or
        Company in an order or acknowledgment shall be void unless expressly
        agreed to in writing by the other party.

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5.1     CHANGE ORDER

        Subject to Section 5.2.4, Siemens shall have the right, by written
        change order, to make changes in any one or more of the following: (a)
        quantity of goods to be delivered; (b) method of shipping or packing;
        (c) place of delivery; and (d) delivery schedules. In addition, if any
        such change order causes an increase or decrease in the cost or the time
        required for performance of the work under the order, an equitable
        adjustment shall be made in price and/or delivery schedule, and the
        order shall be modified accordingly.

        Orders may not be cancelled after shipment. Once accepted, Company shall
        not change an order without written approval by Siemens.

5.2     SCHEDULE COMMITMENTS

        5.2.1   The requested delivery dates applicable to each order will be
                set forth in such order. Delivery dates will be confirmed by
                Company's acknowledgement. Company agrees not to ship Product
                prior to the agreed upon delivery date without Siemens' prior
                written authorization.

        5.2.2   Subject to the provisions contained in the Section 14.12
                CONTINGENCY, in the event Company exceeds the agreed upon
                delivery date by more than five (5) business days, through no
                fault of Siemens, then in addition to all other rights and
                remedies provided for in this Agreement or otherwise and without
                any liability or obligation to Siemens, Siemens shall have the
                right to: (a) cancel the order or change such order if the delay
                results in the cancellation or change of the order from the
                Siemens Customer or (b) extend such delivery date to a later
                date.

        5.2.3   If an order is canceled pursuant to the above, Siemens shall
                have the right to retain or return any or all Product received
                by or paid for under such order. Company shall reimburse Siemens
                the costs of shipping the Product returned and amounts, if any,
                previously paid by Siemens for the Product; provided, however,
                if such order is part of a blanket purchase order, Siemens shall
                not have the right to return any Products previously delivered
                in connection with any prior scheduled shipments delivered under
                such blanket purchase order. Siemens shall pay for any Product
                retained at the prices set forth in Attachment E, if applicable,
                and quantity discounts, if any, shall be applied on the basis of
                the quantity specified in the order.

        5.2.4   If Siemens requests, for reasons other than covered by Section
                14.12 CONTINGENCY, that shipments be postponed beyond the date
                shown on an order and the date shown on the order is within
                forty-five (45) days succeeding the date of the receipt of the
                order postponement, Company may invoice Siemens as of the
                original scheduled delivery date for the Product manufactured
                hereunder. Title for such delayed Product shall pass to Siemens
                on date of invoice.

                The following schedule will be used to establish Siemens'
                obligations when it requires that shipments be rescheduled
                beyond the date shown on an order:

Page 11.
<PAGE>   16

<TABLE>
<CAPTION>
                DAYS PRIOR TO SCHEDULED DELIVERY                     CANCELLATION CHARGE
                --------------------------------                     -------------------
<S>                                                                 <C>
                Less than 45 days                                    Siemens Commits to Purchases

                46 - 60 days                                         10% Restocking Fee

                More than 60 Days                                    None
</TABLE>

                Siemens shall not reschedule any purchase order more than once.

        5.2.5   All Product invoiced to Siemens in accordance with the foregoing
                paragraph shall be marked conspicuously as Siemens' property,
                and stored by Company in a reasonably safe manner separated from
                any other material stocks. Such Product shall be shipped out as
                ordered by Siemens. Company shall have no liability for any loss
                or damage to such Product while stored by Company unless such
                loss or damage arises from Company's gross negligence or willful
                misconduct. Company agrees to cooperate with Siemens in regard
                to the safe storage and management of Siemens" property while
                such property is stored at the Company's facility. Company
                agrees to secure proper storage and insurance for Siemens'
                property when so requested in writing by Siemens. Siemens shall
                reimburse Company for storage and insurance costs for such
                Product.

                Company shall advise Siemens in writing of the specific location
                where Product is stored pursuant to Section 5.2.5 and of any
                subsequent movement of the Product. Company agrees, upon request
                by Siemens, to execute and deliver to Siemens a bill of sale
                evidencing conveyance/license of such Product, free from liens
                and encumbrances, together with any other document such as a
                bailment agreement, warehouse receipt, lease (on storage space),
                mortgage, deed of trust, or surety bond as Siemens may deem
                reasonably necessary to secure title in such Product against
                third parties, all of which documents shall be in a form
                reasonably acceptable to Siemens.

5.3     PACKING

        5.3.1   Company shall, at no charge, unless specified elsewhere in this
                Agreement, package and pack Product in a manner which will
                provide reasonable protection against damage (including static)
                during shipment, handling and storage in reasonably dry unheated
                quarters with temperatures and humidity levels within -30 to +65
                degrees Celsius, and up to 95% relative humidity, respectively.
                Corrugated shipping containers shall comply with requirements of
                Rule 41 of the Uniform Freight Classification. Containers of any
                type that are too heavy or too large to be palletized shall be
                skidded to facilitate fork truck and/or mechanical handling.

Page 12.
<PAGE>   17

        5.3.2   Company shall mark all such packaging for identification
                purposes in accordance with ARTICLE XI, COMPLIANCE. Company
                shall mark Products in conformance with Company's published
                documentation. Items which are intended to be field replaceable
                by Siemens shall be serialized for tracking and control
                purposes. Serial numbers shall be located to allow easy capture
                by craftspersons, without the necessity of disassembly of the
                field replaceable item and/or interruption of service to
                Siemens' Customers.

5.4     SHIPPING

        Unless specifically agreed to by Siemens and Company, all shipments to
        Siemens will be FOB Shipping Point, Freight Collect utilizing one of the
        approved and preferred carriers listed below. If questions arise
        concerning shipments Company is directed to contact the Siemens ICN
        Transportation Department at telephone (407) 942-5499 or 942-5347.

        5.4.1   Siemens' Approved Carriers:

                            Ground Parcel Shipments:
                         UPS Ground - Consignee Billing
                                   RPS Ground

                     LTL Motor Freight - Southeast Regional:
                           Southeastern Freight Lines
                                 Averitt Express

                          LTL Motor Freight - Longhaul:
                            Consolidated Freightways
                             Overnite Transportation

              Air Freight - Envelopes and packages up to 20 lbs.:
                                      FEDEX

                    Air Freight - Packages 21 lbs. and over:
                                Emery Air Freight
                             Burlington Air Express

                              Deferred Air Freight:
                             LEP/Profit Air Freight

                  International Envelope/Non-dutiable Parcels:
                                      FEDEX

                    International Package/Commercial Orders:
                              Kuehne & Nagel, Inc.
              (must consign to Orlando International Airport (MCO)

                           Van Line and TL Shipments:
                       Contact Siemens Traffic Department.

Page 13.
<PAGE>   18

        5.4.2   Additional Instructions:

                -       Consolidate each day's shipments into a single shipment
                        whenever possible.

                -       Route all motor freight and air shipments "Freight
                        Collect".

                -       Unless otherwise requested by exception, do not declare
                        an "insured value" with the carrier as Siemens is
                        self-insured.

                -       Air or other premium shipments must be authorized by a
                        Siemens ICN Purchasing Agent and will be routed via
                        second day service unless instructed otherwise.

                -       Excess transportation charges resulting from
                        non-compliance may be billed to the supplier or deducted
                        from the supplier's invoice.

                -       No "COD" or "FCCOD" deliveries unless previously agreed
                        to by Siemens.

                -       Contact the Traffic Department in the event of carrier
                        service failure(s) or if a deviation from these
                        instructions is desired.

        5.4.3   Unless prior approval has been provided in writing, all
                shipments NOT in compliance with these freight terms or carrier
                routing instructions will be refused at the destination.

        5.4.4   Unless otherwise agreed to in writing, all Product shipments
                under this Agreement will be in new, unused condition.

        5.4.5   Title and risk of loss shall pass to Siemens upon proper tender
                of delivery to the carrier.

        5.4.6   Siemens shall not be charged for cartons, wrapping, boxing,
                crating, drayage or other such costs, provided Siemens shall pay
                for any such costs incurred in connection with Siemens' special
                packaging requests.

        5.4.7   Company shall ship Product from Company's nearest facility
                capable of supplying Siemens' needs.

        5.4.8   Product, Special Products, and Spares will be shipped with a
                packing list enclosed with each shipment.

5.5     RECEIVING AND INSPECTION

        5.5.1   There shall be no partial shipments unless authorized by Siemens
                in writing. Company shall be responsible for Siemens' reasonable
                direct out of pocket costs actually incurred as a result of any
                unauthorized partial shipments. Siemens reserves the right to
                make final inspection of Product, Spares, and Special Products
                up to thirty (30) days after receipt by Siemens. After such
                time, such Products, Spares and Special Products will be deemed
                accepted by Siemens and Siemens' sole recourse shall be limited
                to its warranty hereunder.

Page 14.
<PAGE>   19

        5.5.2   Siemens may, upon inspection, notify Company of any defect,
                deficiency, or default and reject such goods. Goods so rejected
                may be returned to Company under warranty and unless promptly
                replaced may subject the Company to cancellation of the order.
                All defective Product returned under warranty will be at
                Company's expense.

        5.5.3   Goods shipped in advance of delivery schedule or unauthorized
                partial shipments, other than as provided for herein, may be
                rejected or returned to Company at Company's expense.

5.6     TITLE AND RISK OF LOSS

        5.6.1   Unless otherwise specified herein, title to Products, shall vest
                in Siemens when the Product has been delivered, consistent with
                the shipment date designated on the order, to the Carrier
                specified by Siemens. However, if Siemens expressly authorizes
                Company in writing to invoice Siemens for stocks prior to
                delivery, title to such stocks shall vest in Siemens upon
                receipt of the invoice.

        5.6.2   Company will insure, at Siemens expense, all Product orders
                hereunder from the delivery of the stock to FOB carrier
                designated by Siemens until delivery to Siemens of such Product
                at the location designated on the Order. Company shall cooperate
                with Siemens in every reasonable way to facilitate the
                settlement of any such claim.

                                   ARTICLE VI

                                     PAYMENT

6.0     PAYMENT TERMS

        6.0.1   Unless otherwise a greed to in writing by the Parties, the terms
                for all orders shall be net forty-five (45) days after receipt
                of invoice, provided, however, that payment shall not constitute
                acceptance of the goods or impair Siemens right of inspection.

        6.0.2   No C.O.D. payment terms shall be valid without Siemens prior
                written consent.

        6.0.3   Siemens will not accept invoices for partial shipments unless
                Siemens provided prior written approval to the Company.

6.1     INVOICING

        6.1.1   All applicable Federal, State, and local taxes shall be stated
                separately on Company invoice and paid by Siemens.

        6.1.2   Company shall render its invoice within two (2) business days of
                shipment.

Page 15.
<PAGE>   20

                                   ARTICLE VII

                                    WARRANTY

7.0     WARRANTY

        7.0.1   Company warrants to Siemens only and not to Siemens' Customers
                that, for a period of fifteen (15) months for hardware and six
                (6) months for Software, from date of shipment by Company, the
                Product sold or licensed hereunder shall be free from respects
                in material and workmanship and shall in all respects conform in
                all material respects to their final published Specifications,
                including any modification thereof mutually agreed upon in
                writing, included in Attachment C.

        7.0.2   The Parties mutually agree to negotiate the terms and conditions
                of the services provided by Company for warranty and extended
                warranty. The parties' agreement with respect to these matters
                will be set forth in a Service Level Agreement ("SLA") to be
                executed within thirty (30) days of the execution of this
                Agreement. If the parties fail to execute the SLA and attach it
                hereto as an Exhibit within such thirty (30) day period or any
                extension thereto as mutually agreed to by the parties, either
                party shall have the right to immediately terminate this
                Agreement, in which event Siemens may return to the Company for
                full refund the Products, if any, shipped pursuant to Section
                4.4.

        7.0.3   This warranty may only be utilized by Siemens and not Siemens'
                Customers, however, the sale or sub-license by Siemens to its
                Customers shall not terminate the warranty. Siemens shall
                provide first and second level warranty support and
                out-of-warranty sub-assembly replacement support directly to its
                end-user Customers. To this end, Siemens will maintain an
                appropriate level of spares inventory.

        7.0.4   If any Product supplied by Company hereunder fails to conform to
                this warranty, Company shall, at its option and sole cost and
                expense, either repair or replace the same. This warranty is
                made upon the express condition that:

                (a)     Company is given prompt written notice upon discovery of
                        any non-conformity, with explanation of the alleged
                        deficiencies;

                (b)     Siemens first secures a return material authorization
                        (RMA) and such Product is returned to Company's
                        manufacturing facilities, shipping prepaid, except as
                        otherwise agreed;

                (c)     The Product has not been altered, modified or changed in
                        any other manner than has been previously authorized in
                        writing by Company nor has Product been subject to
                        misuse or damage due to improper handling and/or
                        operation;

                (d)     Repairs to the Product have not been made by anyone
                        other than Company, or at Company's authorized service
                        facility; and

Page 16.

<PAGE>   21

                (e)     The Product was properly installed and maintained.

        7.0.5   Company will repair or replace the hardware within a reasonable
                time and will return repaired Product or will supply replacement
                Products to Siemens at Company's expense. For Software, Company
                will issue a patch or work around within a time frame as
                specified in the Service Level Agreement to be negotiated
                separately between the Parties.

        7.0.6   No term, condition, understanding, or agreement purporting to
                modify the terms of this warranty shall have any legal effect
                unless made in writing and signed by authorized representatives
                of both Parties.

        7.0.7   All Products which have been repaired or replaced by Company
                shall have the same warranty as above for Product originally
                shipped, except the term of the warranty shall be the balance of
                the period of time ascertained by deducting from the original,
                warranty term the number of days from shipment of the original
                unit by Company, and the time or receipt by Company of the
                defective Product, or ninety (90) days for hardware, thirty (30)
                days for the same defect for Software, from date of repair or
                replacement, whichever is greater.

        7.0.8   Company shall make available, upon request by Siemens Quality
                Assurance Department, repair data on defective Product returned
                by Siemens for repair. Company shall maintain this data as a
                repair history for a minimum of one (1) year.

        7.0.9   Company represents and warrants that it is authorized to grant
                the Software Licenses granted in this Agreement.

7.1     YEAR 2000 COMPLIANCE WARRANTY

        Company represents and warrants (the "Year 2000 Warranty") that (a) all
        Calendar-Related processing by the Products and Special Products of Date
        Data or of any System Date will not cause the Products to cease to
        operate substantially in accordance with their Specifications, (b) all
        data fields for the Date Data contained in the Products and Special
        Products are four-digit fields capable of indicating century and
        millennium, and (c) that Company has verified through its testing
        procedures that no change in the System Date (including the change from
        the year 1999 to the year 2000) will cause the Products or the Special
        Products to cease to operate substantially in accordance with their
        Specifications. Notwithstanding any provision to the contrary set forth
        in this Agreement, Company makes no representation or warranty with
        respect to the Products or Special Products operating in conjunction
        with any computer software, computer firmware, computer hardware, or any
        combination of the foregoing supplied by third parties. As used in this
        Section 7.2, the following terms shall have the meanings set forth
        below:

                "Calendar-Related" refers to date values based on the Gregorian
                calendar as defined in Encyclopedia Britannica, 15th edition,
                1982, page 602, and to all uses of those date values described
                in the Product Specifications.

Page 17.
<PAGE>   22

                "Date Data" means any Calendar-Related data in the inclusive
                range January 1, 1900 through December 31, 2050 that the
                Products or Special Products use in any manner.

                "System Date" means any Calendar-Related, date value in the
                inclusive range from January 1, 1985 through December 31, 2035
                (including the transition between such values) that the Products
                or Special Products will be able to use as their current date
                while operating.

        In the event that a Product or Special Product fails to comply with the
        warranty provided in this Section 7.2 in any material respect, Company
        shall use commercially reasonable efforts to modify or replace such
        Product or Special Product, or applicable component thereof, to correct
        such non-compliance. If Company is unable, through the use of
        commercially reasonable efforts, to modify or replace the Product or
        Special Product to correct the noncompliance, Company shall refund to
        Siemens the price paid by Siemens for such non-compliant Product or
        Special Product and Siemens may at its option cancel any purchase orders
        for such Products without incurring any liability for such cancellation.
        The remedy set forth in this Section 7.2 shall be Siemens' sole remedy
        for breach of the Year 2000 Warranty.

        Company also warrants and represents that it has assessed or is
        currently assessing Year 2000 compliance issues as it relates to its
        business operations; that it is actively resolving any internal Year
        2000 non-compliance relating to its operations; and that it will achieve
        Year 2000 compliance prior to January 1, 2000. Such compliance includes,
        but is not limited to, systems critical to the procurement of raw
        materials and components and/or the manufacture and shipment of Products
        to Siemens; provided, such compliance does not include any obligation to
        ensure that any third party's systems are Year 2000 compliant.

7.2     WARRANTY EXCLUSIONS

        THE WARRANTY PROVIDED IN ARTICLE VII EXCLUDES ALL OTHER WARRANTIES,
        WHETHER EXPRESS OR IMPLIED, ORAL OR WRITTEN, INCLUDING, WITHOUT
        LIMITATION ANY WARRANTY OF MERCHANTABILITY AND/OR FITNESS FOR A
        PARTICULAR PURPOSE. COMPANY WILL NOT, IN ANY EVENT BE LIABLE FOR
        SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS OR
        LOSS OF DATA OF ANY KIND OR TYPE OF SIEMENS ARISING FROM BREACH OF
        WARRANTY.

        SIEMENS' SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF THE FOREGOING
        WARRANTY SHALL BE REPLACEMENT OF OR (AT COMPANY'S OPTION OR IF
        REPLACEMENT IS IMPRACTICAL) REFUND OF THE DEPRECIATED PURCHASE PRICE FOR
        RETURNED NON-CONFORMING UNITS OF THE PRODUCTS FOR WHICH FULL
        DOCUMENTATION AND PROOF OF NON-CONFORMITY IS PROVIDED TO COMPANY;
        PROVIDED, IN THE EVENT PRODUCTS COVERED BY WARRANTY (INCLUDING EXTENDED

Page 18.
<PAGE>   23

        WARRANTIES PURCHASED BY SIEMENS) EXPERIENCE AN EPIDEMIC FAILURE AND
        COMPANY ELECTS NOT TO REPAIR OR REPLACE SUCH PRODUCTS, COMPANY SHALL
        REFUND THE UN-DEPRECIATED PURCHASE PRICE PAID BY SIEMENS FOR SUCH
        PRODUCTS IF SUCH PRODUCTS WERE DELIVERED WITHIN THREE (3) YEARS OF
        FAILURE AND THE DEPRECIATED PURCHASE PRICE. IF SUCH PRODUCTS WERE
        PURCHASED MORE THAN THREE (3) YEARS PRIOR TO FAILURE. "EPIDEMIC FAILURE"
        SHALL MEAN THE SAME MATERIAL FAILURE OR MATERIAL SPECIFICATION
        NON-CONFORMITY OF THE PRODUCT OCCURRING DUE TO THE SAME SPECIFICALLY
        IDENTIFIED CAUSE TO MORE THAN 5% OF INSTALLED PRODUCT WITHIN THREE (3)
        MONTHS, IN WARRANTY OR EXTENDED WARRANTY.

        COMPANY HAS NOT AUTHORIZED ANYONE TO MAKE ANY REPRESENTATION OR WARRANTY
        OTHER THAN AS PROVIDED IN THIS ARTICLE VII.

                                  ARTICLE VIII

                                 REPAIR SERVICE

8.0     REPAIRS NOT COVERED UNDER WARRANTY

        The parties are currently negotiating the terms and conditions of
        out-of-warranty services, emergency replacement services and ongoing
        support. The parties' agreement with respect to these matters will be
        set forth in a Service Level Agreement ("SLA") to be executed within
        thirty (30) days of the execution of this Agreement. If the parties fail
        to execute the SLA and attach it hereto as an Exhibit within such thirty
        (30) day period or any extension thereto as mutually agreed to by the
        parties, either party shall have the right to immediately terminate this
        Agreement, in which event Siemens may return to the Company for full
        refund the Products, if any, shipped pursuant to Section 4.4.

Page 19.
<PAGE>   24

                                   ARTICLE IX

                                    TRAINING

9.1     TRAINING

        9.1.1   Company shall offer to Siemens, at the prices listed in
                Attachment E, instructors and necessary instructional materials
                of Company's standard format to train Siemens personnel in the
                planning, configuring, installation, operation, and maintenance
                of Product. Such training shall, at Siemens' option, be held at
                Company's location or at Siemens' location. When such training
                is held at Siemens' location, Siemens shall provide adequate
                training facilities. However, Company agrees to provide at
                Company's facility at no charge to Siemens a one-time training
                program for up to 6 Siemens' employees for purposes of initial
                technical support readiness and train-the-trainer readiness.

        9.1.2   At the option of Siemens, Company shall at prices mutually
                agreed to, provide Siemens with training materials, student
                manuals, instructors' manuals, and any necessary assistance,
                covering those areas of interest outlined in Section 9.1.1,
                sufficient in detail, format and quantity to allow Siemens to
                develop and conduct a training program.

        9.1.3   Siemens shall be provided, at Siemens' cost, with updated
                training materials to reflect any changes, modifications, and
                enhancements to the Product. Training materials, courses, or
                bulletins will be provided by Company, as deemed necessary by
                Siemens, anytime significant changes to Product are made.

                                   ARTICLE X

                                  DOCUMENTATION

10.0    SPECIFICATIONS OR DRAWINGS

        Specifications shall cover the Products provided hereunder and are
        attached hereto as Attachment C; provided, however, where Products are
        still being developed, the Product Specifications are subject to change
        from time to time until the Products have been developed.

10.1    DOCUMENTATION

        10.1.1  Company agrees to furnish and convey to Siemens, in English, at
                no charge, one (1) complete set of Product documentation as is
                normally provided with the Product, and any succeeding changes
                hereto, as described in the Section 3.4 PRODUCT CHANGES. A list
                of such Product documentation is contained in Attachment B. Such
                Product documentation shall include the right to reproduce such
                Product documentation for use hereunder.

Page 20.
<PAGE>   25

                With each shipment by Company to Siemens, Company shall include
                without charge one (1) copy of documentation for each Product
                shipped.

        10.1.2  Company further agrees to furnish documentation in an electronic
                format conforming to one of the following specifications:

                a.      Master Documentation Set on diskette or CD-ROM saved in
                        HTML (Hyper Text Markup Language) OR

                b.      Master Documentation Set on diskette or CD-ROM saved in
                        SGML (Standard Generalized Markup Language), along with
                        Document Type Definitions (DTDs). Company will be
                        charged a fee by Siemens for converting the
                        documentation to a format compatible with our Customers'
                        browsers (HTML) OR

                c.      Company may provide Siemens with Uniform Resource
                        Locator (URL) to their electronic documentation on the
                        World Wide Web OR

                d.      Master Documentation Set on diskette or CD-ROM saved in
                        a current version of a commonly used word processing
                        package or in American Standard Code for Information
                        Interchange (ASCII). Company will be charged a fee by
                        Siemens for converting the documentation to a format
                        compatible with our Customers' browsers (HTML).

        10.1.3  Company must notify Siemens in writing of all updates to
                documentation. Notification will be sent to the Director of PLM
                Broadband Products in Boca Raton, Florida. This notification
                will include the new issue number, date of change, and reason
                for change. Siemens is responsible for notifying its end-user
                Customers.

10.2    USE OF INFORMATION

        All specifications, drawings, sketches, models, samples, tools, computer
        programs, technical information, confidential business information or
        data, written, oral or otherwise (all herein designated "Information")
        obtained by either Party hereunder or in contemplation hereof shall
        remain the property of the disclosing Party. Unless required to support
        the existing Customer base, all copies of such Information in written,
        graphic or other tangible form shall be returned to its owner upon
        request. Unless such Information was previously known to be free of any
        obligation to keep it confidential or has been or is subsequently made
        public by its owner or a third party pursuant to Article II
        CONFIDENTIALITY PROVISIONS, it shall be kept confidential, shall be used
        only in the filling of orders, or in performing otherwise hereunder, and
        may be used for other purposes only upon such terms as may be agreed
        upon in writing by both Parties.

Page 21.
<PAGE>   26

10.3    REPRODUCTION OF DOCUMENTATION

        Siemens may, in either electronic or paper media, do the following:
        reproduce, prepare derivatives and distribute copies of documentation
        supplied by Company under this Agreement for the purpose of allowing
        Siemens and its Customer to market, use and maintain the Products
        supplied by Company under this Agreement. All copies, so produced shall
        contain all copyright and/or other proprietary notice contained in the
        original Company supplied documentation. Siemens shall ensure that all
        such derivatives and copies are accurate and shall be solely responsible
        for any errors with respect thereto. Siemens shall indemnify Company for
        any liability arising from such reproduction, preparation and
        distribution of any such defective derivative or copied materials.

                                   ARTICLE XI

                                   COMPLIANCE

11.0    RADIO FREQUENCY ENERGY STANDARDS

        Materials furnished hereunder shall comply, to the extent applicable,
        with the requirements of Subpart J of Part 15 of the Federal
        Communications Commission's Rules and Regulations, as may be amended
        from time to time, including those sections concerning the labeling of
        such material and the suppression of radio frequency and electromagnetic
        radiation to specific levels. Should the Products generate harmful
        interference to radio communications, Company shall provide to Siemens
        information relating to methods of suppressing such interference. In the
        event such interference cannot reasonably be suppressed, Company shall,
        at the option of Siemens, accept return of the applicable Product and
        refund to Siemens the price paid for such Product and Siemens may cancel
        any pending orders for such Product without incurring any liability for
        such cancellation. Nothing herein shall be deemed to diminish or
        otherwise limit Company's obligations under Article VII WARRANTY of this
        Agreement.

11.1    REGISTRATION

        When Products furnished under this Agreement is subject to Part 68 of
        the Federal Communications Commission's Rules and Regulations, as may be
        amended from time to time, Company warrants that such Product when
        delivered is registered under and complies with Part 68 of the Federal
        Communications Commission's Rules and Regulations, including, but not
        limited to, all labeling and Customer instruction requirements. Company
        agrees to indemnify and save Siemens harmless from any liability, claims
        or demands (including the costs, expenses and reasonable attorney's fees
        on account thereof) that may be made because of Company's noncompliance
        with Part 68 of the Federal Communication Commission's Rules and
        Regulations. Company agrees to defend Siemens, at Siemens' request,
        against such liability, claim or demand. In such cases, Company shall
        have the right to control and direct the defense of and settlement of
        each claim or demand. Siemens shall promptly notify Company of all such
        claims. In

Page 22.
<PAGE>   27

        the event Siemens fails to promptly notify Company of any such
        liability, claim or demand and such failure prejudices Company's ability
        to defend against such claim, liability or demand, Company's liability
        under this Section 11.1 shall be excused to the extent of such
        prejudice.

11.2    TOXIC SUBSTANCES AND HAZARDOUS MATERIAL

        11.2.1  All material that is a "hazardous chemical substance or mixture"
                or a "hazardous material" as these terms are defined in the
                Toxic Substance Control Act and the Hazardous Material
                Transportation Act are hereinafter referred to as Hazardous
                Material.

        11.2.2  Company agrees to ship all such Hazardous Material on an F.O.B.
                Shipping Point, Freight Collect basis. Company agrees to comply
                with all labeling, packaging, shipping and all requirements as
                required by the afore-referenced acts, the Code of Federal
                Regulation, Title 49 and all applicable state and local
                regulations. The Hazardous Material itself and its packaging
                shall be clearly and visibly marked so as to be readily
                identified.

                Company agrees to provide the assistance to Siemens of an
                advisory nature in the use and disposal of all hazardous
                material purchased hereunder.

11.3    COMPLIANCE WITH LAWS

        11.3.1  Each party shall comply with all applicable federal, state,
                county and all local laws, ordinances, regulation and codes
                (including procurement of required permits or certificates) in
                its performance hereunder, irrespective of whether a
                specification is furnished. If material, services or containers
                furnished are required to be constructed, packaged, labeled or
                registered in a prescribed manner, Company shall comply with
                federal law and, in addition, with applicable state or local
                law. Each party agrees to defend, indemnify and hold harmless
                the other party for any loss, damage, penalty, fine or liability
                sustained because of its noncompliance; provided, Siemens shall
                be solely responsible for, and shall indemnify Company for any
                losses, fines charges or damages arising from, any claim which
                results solely from Company's compliance with specific
                instructions by Siemens as to construction, packaging, labeling
                or registration.

        11.3.2  Siemens shall not export any Products outside the United States
                and Canada without Company's express written permission. In the
                event Siemens receives such permission, Siemens agrees to fully
                comply with all relevant export laws and regulations of the
                United States to assure that no violation of such export laws or
                regulations occurs and shall be fully responsible for obtaining
                any required licenses or approvals; provided, Company shall, at
                Siemens' expense, provide reasonable assistance to Siemens in
                obtaining any such licenses and approvals.

        11.3.3  Company agrees to comply with any and all laws, rules and
                regulations governing design, manufacture, and testing of
                Product delivered to Siemens.

Page 23.
<PAGE>   28

11.4    COMPLIANCE WITH CERTIFICATION TESTS REQUIRED BY NORTH AMERICAN PUBLIC
        NETWORK PROVIDERS

        Company agrees that it will conduct the testing necessary to assure that
        the Product is compliant with requirements specified by Bellcore
        M-63-CORE, Network Equipment-Building Systems (NEBS), Issue 1, October
        1995. The testing required for Special Products will be mutually agreed
        to by the Parties.

        Company agrees to provide a copy of all test results to Siemens upon
        completion of the testing.

                                  ARTICLE XII

                              TERM AND TERMINATION

12.0    TERM OF AGREEMENT

        Unless otherwise amended in writing by the Parties, the Term of this
        Agreement shall commence on the Effective Date and continue for
        thirty-six (36) months. This Agreement may be extended at the mutual
        written agreement of the parties for a period of twenty-four (24) months
        upon the expiration of the initial term of the Agreement.

        This Agreement shall apply to the sale and or license of the Product to
        Siemens for use in the United States of America and Canada. The Parties
        may, upon mutual agreement, amend the Agreement to extend the terms and
        conditions of the Agreement for use of the Product by Siemens in other
        countries if Siemens so requests.

12.1    TERMINATION OF AGREEMENT

        12.1.1  Notwithstanding the provisions of Section 12.0 or any provision
                limiting the remedy of a Party, if either Party hereto shall
                fail to adequately perform or observe any of the terms and
                conditions to be performed or observed by it under this
                Agreement, the other Party shall give written notice to the
                defaulting Party specifying the respects in which the defaulting
                Party has so failed to perform or observe the terms and
                conditions of this Agreement, and in the event that any defaults
                so indicated shall not be remedied by the defaulting Party
                within thirty (30) days after such notice, the Party not in
                default may, by written notice to the defaulting Party terminate
                this Agreement or any outstanding order hereunder effective upon
                the defaulting Party's receipt of such notice of termination.
                Failure of either Party to so terminate this Agreement due to a
                breach on the part, of the other Party shall not prejudice its
                rights to terminate for a subsequent breach on the part of the
                defaulting Party. In addition the Company shall be entitled to
                terminate this Agreement pursuant to Section 4.3 and 14.13.

Page 24.
<PAGE>   29

        12.1.2  In the event that Company shall (i) cease conducting business in
                the normal course, (ii) become insolvent, (iii) make a general
                assignment for the benefit of creditors, (iv) suffer or permit
                the appointment of a receiver for its business or substantially
                all of its assets, or (v) avail itself or becomes subject to any
                proceeding under the Federal Bankruptcy Act or any other statute
                of any state relating to insolvency or the protection of rights
                of creditors, and such event materially and substantially
                prevents Company from carrying out its obligations hereunder,
                then Siemens may, at its sole option and subject to the
                provisions of this Agreement, terminate this Agreement for
                cause.

        12.1.3  Upon termination of this Agreement for any reason, each party
                shall promptly return any and all materials supplied by the
                other party.

        12.1.4  The provisions of sections 2.1, 2.3, 3.1, 6.0, Article VII,
                9.1.2, 10.2, 11.0, 11.1, 11.3.1, 11.3.2, 11.3.3, 12.0, 13.0,
                13.1, 14.1, 14.2, 14.3, 14.4, 14.5, 14.6, 14.8, 14.9, 14.10,
                14.14, 14.15 which by their nature are intended to survive
                expiration or termination of this Agreement, shall survive
                expiration or termination of this Agreement for any reason. All
                other rights and obligations shall cease upon termination of
                this Agreement. The provisions of the SLA shall survive based on
                the specific terms set forth in such Agreement.

                                  ARTICLE XIII

                                    SOFTWARE

13.0    RIGHTS TO SOFTWARE

        13.0.1  Title to Software furnished to Siemens shall remain in Company.
                For such term as Siemens or its Customers shall continue to use
                and operate Product, Company grants Siemens a non-exclusive
                license to use the binary version of the Software on the
                hardware with which the Software was first supplied and the
                right to sub-license such limited use to Siemens' end-user
                Customers under the end-user license terms as set forth in
                13.0.3, below.

        13.0.2  Siemens or Customer may reproduce the Software for archive or
                maintenance purposes for use with the hardware with which it was
                originally delivered. Any such reproduction or copies shall
                include any copyright, similar proprietary notice or other
                notices contained in the items being reproduced.

        13.0.3  Siemens' or its Customers' rights to use the Software are
                limited as follows:

                (a)     The Software may only be used on the hardware on which
                        it is first supplied or on supplied replacement
                        hardware.

                (b)     Copies may be made for archive or maintenance purposes
                        only. Software may not be modified, de-compiled,
                        disassembled or reverse engineered.

Page 25.
<PAGE>   30

        13.0.4  Siemens may, at no additional charge, sublicense Software as a
                part of the sale, rental, lease, transfer, or assignment of
                Product. Such sub-licensee shall succeed to all of Siemens' or
                Customer's rights and obligations under this license with
                respect to such Software.

        13.0.5  Siemens or Customer may, at no charge, relocate Software to
                another location within the United States for reuse with the
                Product with which it was originally delivered when such Product
                has been relocated. Such relocation or reuse shall not alter
                Siemens' or Customer's license to use the Software.

        13.0.6  The right-to-use fees for Software are as set forth in
                Attachment E, Price Lists.

13.1    SOFTWARE ESCROW

        Siemens has, pursuant to this Agreement, licensed Software from Company
        and Siemens desires to have the Source Code for such Software placed in
        an escrow account substantially in accordance with the terms and
        conditions of an Escrow Agreement, attached hereto as Attachment E.
        Company agrees to place a copy of the Source Code into escrow with a
        mutually agreed Escrow Holder. If there is more than one Software
        program, Company may, at its option, establish separate escrow accounts
        for each Software's Source Code. Company shall ensure that the copy of
        the Source Code that is deposited in Escrow at any given time is the
        latest generally released version.

        The Escrow Agreement shall be fully executed within 90 days of the
        Effective Date of this Agreement.

                                  ARTICLE XIV

                               GENERAL PROVISIONS

14.0    TRANSFERABILITY

        This Agreement shall be binding upon and shall inure to the benefit of
        any corporation, or other legal entity with which Company or Siemens may
        be merged or consolidated, or the successors to or assignee of the total
        assets of either of them which relate to this Agreement.

        Except as provided in the preceding paragraph, neither party may sell,
        assign, transfer, delegate, or subcontract this contract or any rights
        or obligations hereunder, in whole or in part, without the prior written
        consent of the other party, which consent shall not be unreasonably
        withheld.

14.1    DISCLAIMER OF AGENCY

        This Agreement shall not constitute either Party the employee, legal
        representation or agent of the other Party, nor shall either Party have
        the right or authority to assume,

Page 26.
<PAGE>   31

        create, or incur any liability or any obligation of any kind, expressed
        or implied against, or in the name of or on behalf of the other Party.

        If Siemens is approached by any third party, not a Customer of Siemens,
        with respect to any and all matters regarding Company's Products,
        warranties, or terms and conditions of sale, Siemens will refer the
        third party to the Company.

14.2    PUBLICITY

        The parties will, upon completion of the Agreement and at appropriate
        stages during its term agree upon joint press releases to be made to the
        industry and general press.

        Each Party shall use its commercially reasonable best efforts not to
        disclose to any third party during the Term of this Agreement, the terms
        and conditions of this Agreement, except as may be required by law, or
        by governmental regulation, requirements or orders or as may be
        necessary to establish or assert its right hereunder.

14.3    NOTICES

        Any and all written notices, communications and deliveries between
        Company and Siemens with respect to this Agreement shall be effective on
        the date of mailing if (i) sent registered or certified mail; (ii) if
        sent by mutually recognized overnight courier to the respective address,
        subject to change upon written notice, of the other Party as follows:

                             In the case of Siemens:

                                   Siemens ICN
                                400 RINEHART ROAD
                            Lake Mary, Florida 32746
                        Attention: Director of Purchasing

                                 with a copy to:

                                   Siemens ICN
                            900 Broken Sound Parkway
                              Boca Raton, FL 33487
                           Attention: General Counsel

                             In the case of Company:

                           Accelerated Networks, Inc.
                                301 Science Drive
                               Moorpark, CA 93021
                                 Attention: CFO

Page 27.
<PAGE>   32

                                 with a copy to:

                         Brobeck, Phleger & Harrison LLP
                               38 Technology Drive
                                Irvine, CA 92618
                       Attention: Frederic A. Randall, Jr.

14.4    GOVERNING LAW

        This Agreement shall be governed by the laws of the State of California.

14.5    ARBITRATION

        Any dispute hereunder shall be settled by binding arbitration in
        California under the rules of the American Arbitration Association for
        commercial disputes. The arbitrator's ruling may be enforced by any
        court having jurisdiction. Notwithstanding the foregoing, in the event
        of a threat of immediate, irreparable harm, either party may seek
        equitable relief in any court having jurisdiction.

14.6    NON-WAIVER

        No delay or failure to exercise any right or remedy or enforce any
        provision of this Agreement shall operate as a waiver thereof. The
        waiver of one breach or default hereunder shall not constitute the
        waiver of any other or subsequent breach or default.

14.7    EXECUTION OF FURTHER DOCUMENTS

        The Parties agree to execute, acknowledge, and deliver all such further
        instruments, and do all such other acts, as may be necessary or
        appropriate in order to carry out the intents and purposes of this
        Agreement or perfect or protect any right or license granted under this
        Agreement.

14.8    OTHER REMEDIES

        Any and all provisions for remedies agreed to in any specific provisions
        or instances in this Agreement are not intended as exclusive remedies,
        and each Party may pursue, in addition thereto, any remedies it may have
        at law, or otherwise, or take such other action as it may determine.

14.9    EFFECT OF HEADINGS

        The Article, Section, Paragraph, and Attachment headings appearing in
        this Agreement are inserted only as a matter of convenience and in no
        way define, limit, construe or describe the scope or intent of such
        Article, Section, Paragraph, or Attachment nor in any way affect this
        Agreement.

Page 28.
<PAGE>   33

14.10   PATENT AND OTHER PROPRIETARY RIGHTS INFRINGEMENT INDEMNIFICATION

        Company shall defend, indemnify and hold harmless Siemens, at Company's
        cost and expense, against any claim or suit alleging infringement of a
        duly issued United States or Canadian patent, copyright or other
        proprietary right brought against Siemens or its Customers, to the
        extent that such claim pertains to Products or Related Materials and
        Company shall pay all costs incurred in such claim or suit and all
        settlement payments and damages awarded, directly or indirectly,
        incurred in such claim or suit, provided that Siemens gives Company
        prompt written notice of such claim, sole control over its defense and
        settlement and reasonably cooperates with Company in the defense or
        settlement of such claim or suit. Notwithstanding anything herein to the
        contrary, in no event shall Company be responsible, directly or
        indirectly, for lost profits, consequential damages, indirect damages,
        or special damages of Siemens or any Customer of Siemens. If an
        injunction is obtained against use of the Products or Related Materials
        as a result of infringement of a patent, copyright or other proprietary
        right, Company shall, at its option, and at Company's expense, either
        procure the right to continue using the Product or Related Materials,
        replace or modify the same so they become non-infringing, but remain
        functionally equivalent, or accept return of the Product and pay to
        Siemens the actual costs incurred by Siemens in correcting problems
        caused by Company's Product infringement in Siemens' Customers' networks
        up to the purchase/license price paid by Siemens for such Products.
        Furthermore, Company's indemnification obligation hereunder shall not
        cover (a) any claim that any of the Products infringes any third party's
        rights as used in combination with Products not supplied by Company; (b)
        any claim that arises out of Company's compliance with technical
        specifications provide by Siemens; (c) any claim relating to Products
        which have been modified by any person other than Company; or (d) any
        claim relating to Siemens' continued use of an infringing Product after
        notification by Company thereof.

14.11   MARKINGS

        Company shall mark all Products furnished hereunder for identification
        purposes as follows:

        (a)     Model/part number and serial number, if applicable

        (b)     Month and year of manufacture

        (c)     Other identification which may be mutually agreed to by Parties

        In addition, in the event the Company implements, Common Language
        Equipment Identification (CLEI) Codes consistent with GR-485-CORE,
        Company shall also mark such Products with such codes. If Company does
        not implement such codes, Siemens may provide Company with its own codes
        which Company shall attach to the Products pursuant to Siemens'
        instructions. Upon Siemens' written request, certain of Siemens
        trademarks, names, symbols, decorative designs or evidence of Siemens
        inspection (herein "Insignia") may be properly affixed by Company to the
        Product. The design, location and manner in which such Insignia will be
        affixed must be approved in writing by Siemens. Charges, if any, for
        such Insignia shall be billed and payable by Siemens.

Page 29.
<PAGE>   34

        Siemens hereby grants Company a non-exclusive, non-transferable,
        sublicensable, license to affix Insignia to Products solely in
        accordance with Siemens' directions.

14.12   CONTINGENCY

        Neither of the Parties shall be held responsible for any delay or
        failure in performance hereunder caused by fires, strikes, embargoes,
        requirements imposed, by Government regulations, civil or military
        authorities, act of God or by the public enemy or other similar causes
        beyond such Party's control. However, Company's delay or failure to
        perform shall not be excused by a default of any of its subcontractors
        or suppliers unless such default arises out of causes reasonably beyond
        the control of the Company. If such contingency occurs, the party
        injured by the other's inability to perform may by giving written notice
        elect to: (a) terminate a particular order or part thereof if the
        contingency continues for a period of more than thirty (30) days as to
        Product not already received; (b) suspend a particular order for the
        duration of the delaying cause, buy or sell elsewhere Product to be
        bought or sold hereunder, and deduct from any commitments the quantity
        bought or sold or for which commitments have been made elsewhere; or (c)
        resume performance under a particular order once the delaying cause
        ceases with an option in the injured party to extend the period
        hereunder up to the length of time the contingency endured. Unless
        written notice is given within thirty (30) days after such injured party
        is apprised of the contingency, (b) shall be deemed selected.

14.13   DEVELOPMENTS BY SIEMENS

        Nothing contained in this Agreement shall prevent Siemens from
        independently developing, either through the use of its own personnel or
        through third parties, or acquiring from third parties, product similar
        to Product or other types of product. No such product shall be developed
        by Siemens using Company's Proprietary Information. Nothing herein shall
        be construed to grant Company any rights in any such similar product so
        developed or acquired or to the revenues or any portion thereof derived
        by Siemens from the use, sale, lease, license or other disposal of any
        such product.

        Given non-disclosure agreements that may be in place and business
        considerations private to Siemens, Siemens does agree to notify Company
        of such developments as soon as is practicable. Siemens will, however,
        use its best efforts to provide six (6) month notification to Company of
        any such developments that will decrease any of the current forecasts
        for the Annual Delivery Period by more than twenty-five percent (25%).
        In the event of any such development, Company shall be entitled to
        terminate this Agreement pursuant to Section 12.1.1 upon ninety (90)
        days notice to Siemens.

14.14   VALIDITY

        In the event any provisions of this Agreement shall be deemed invalid by
        any court of law, the invalidity of that provision shall not affect the
        remaining portions of this Agreement and any ambiguity which arises by
        reason of such invalidity shall be construed in accordance with the
        overall intent of the Parties as exhibited by the remaining provisions
        of this Agreement.

Page 30.
<PAGE>   35

14.15   LIMITATION OF LIABILITY

        Except for Company's obligation under Paragraph 14.10, in no event shall
        either Party be liable to the other for any lost revenue, profits or
        data or any special incidental, consequential or other such indirect
        damages, whether arising out of or as a result of breach of contract,
        warranty, tort (including negligence), strict liability or otherwise.

Page 31.
<PAGE>   36

                                  ATTACHMENT A

                                PRODUCT STRUCTURE

Brief description in marketing terms or Product brochures of:

(a)     Product Configuration

(b)     Spare Parts for Product

(c)     Special Products

(d)     Reserved

(e)     Software

Should include specific items such as:

(a)     Specific Product Numbers and Descriptions

(b)     Spare Parts List and Descriptions

(c)     Special Product Components .

(d)     Software Description and Function

Page 32.

<PAGE>   37

                                  ATTACHMENT B

Describe and list all materials that are furnished by Company at no charge or
are available for purchase by Siemens.

Included in this list are such items as:

            Sales Brochures
            System Manual
            Operations Manual or Procedures
            Installation Manual
            Program Manual
            Maintenance Manual
            Test and Diagnostic Information
            User Manuals
            Training Manual and Training Aids
            Special Product Information

Page 33.<PAGE>   1

                                                                  EXHIBIT 10.18

              SIEMENS INFORMATION AND COMMUNICATION NETWORKS, INC.

                                     - AND -

                           ACCELERATED NETWORKS, INC.

                             SERVICE LEVEL AGREEMENT

<PAGE>   2

                             SERVICE LEVEL AGREEMENT

                                     Between

                           Accelerated Networks, Inc.
                                   Located at:
                                301 Science Drive
                               Moorpark, CA 93021
                    - hereinafter referred to as "Company" -
                   ..........................................

                                       and
              Siemens Information and Communication Networks, Inc.
                                having offices at
               900 Broken Sound Parkway, Boca Raton, Florida 33487
                    - hereinafter referred to as "SIEMENS" -

WHEREAS SIEMENS and Company have entered into an OEM Agreement relating to sale
and distribution of certain Products; and

WHEREAS, the Parties wish to set out the terms and conditions under which a
Party will provide services for the Products sold by it;

NOW THEREFORE IN CONSIDERATION of the mutual covenants and agreements, and other
good and valuable consideration the receipt and sufficiency of which is hereby
acknowledged, the Parties hereto agree as follows:

        (a)     The Articles, Attachments, and Amendments contained in this
                Service Level Agreement are considered as part of the OEM
                Agreement executed between the parties dated 12/18/99;

        (b)     No modifications or waiver of any of the provisions, or any
                future representation, promise, or addition shall be binding
                upon the Parties unless agreed to in writing;

        (c)     This Service Level Agreement is, by its nature, intended to
                survive expiration or termination of the OEM Agreement and shall
                survive expiration or termination of the OEM Agreement for any
                reason.

        IN WITNESS WHEREOF, the Parties hereto have as of the Effective Date
duly executed this Agreement, including Attachments A through I which are
incorporated herein and made a part hereof, by the respective officers thereunto
duly authorized.

Accelerated Networks, Inc.                     SIEMENS INFORMATION AND
                                               COMMUNICATION NETWORKS, INC.

         /s/ Suresh Nihalani
By:      Mr. Suresh Nihalani                   By:     /s/ John D. McGowan
Title:   President                             Title:  Purchasing Manager
Date:    2/23/99                               Date:   3/5/99

                                       2

<PAGE>   3

<TABLE>
<S>      <C>                                                                                                          <C>
1.       DEFINITIONS...................................................................................................5

2.       SERVICES TO BE PERFORMED......................................................................................7

         2.1   General Services and Additional Services................................................................7
         2.2   Services not Included...................................................................................7
         2.3   Excluded Services, Separate Agreement...................................................................7

3.       COMMERCIAL TERMS..............................................................................................8

         3.1   Price for Additional Services...........................................................................8
         3.2   Warranty................................................................................................8
         3.3   Cost of out of Warranty Repair / Advanced Replacement Services..........................................8
         3.4   Technical Assistance....................................................................................8
         3.5   Technical Support for Software..........................................................................8

4.       COMPANY'S OBLIGATIONS.........................................................................................9

         4.1   Services to be Provided by Company......................................................................9
               4.1.1       Technical Assistance........................................................................9
               4.1.2       Technical Support...........................................................................9
                           4.1.2.1     Third Line Support and Problem Escalation.......................................9
                           4.1.2.2     Software Maintenance............................................................9
                           4.1.2.3     Compatibility and Correction Matrix ............................................9
                           4.1.2.4     Hardware Upgrades ..............................................................9
                           4.1.2.5     Support of Older Releases ......................................................10
                           4.1.2.6     Sporadic Malfunction ...........................................................10
                           4.1.2.7     Epidemic Failure ...............................................................10
                           4.1.2.8     Undetermined Problems ..........................................................10
                           4.1.2.9     Design Requirements ............................................................11
               4.1.3       Documentation...............................................................................11
                           4.1.3.1     Commercially Available Documentation............................................11
                           4.1.3.2     Electronic Bulletin Board Access ...............................................12
               4.1.4       Hardware Repair.............................................................................12
               4.1.5       Repair Alternatives.........................................................................14
               4.1.6       REFURBISHMENT...............................................................................14
               4.1.7       PRODUCT AVAILABILITY........................................................................15
               4.1.8       Extended Warranty Contract..................................................................15
               4.1.9       Reports.....................................................................................15
         4.2   Problem Resolution time frames..........................................................................15
         4.3   Additional Services.....................................................................................15
               4.3.1       Request for Additional Services.............................................................15

5.       SIEMENS' OBLIGATIONS..........................................................................................16

         5.1   Test Equipment availability.............................................................................16
         5.2   Adequate Training for First and Second Line Support individuals.........................................16
         5.3   Spares..................................................................................................16
         5.4   Adequate Support Personnel..............................................................................16

6.       SCHEDULE A: PROBLEM RESOLUTION SERVICES.......................................................................17

7.       SCHEDULE B: MANAGEMENT ESCALATION PROCEDURE...................................................................20

8.       SCHEDULE C: OPERATING PROCEDURES..............................................................................21

9.       SCHEDULE D: REPAIR AND REPLACEMENT............................................................................22

         9.1   Requests for Return.....................................................................................22
         9.2   Shipping of Defective Products..........................................................................22
         9.3   Repair and Return.......................................................................................22
         9.4   Return directly to Company..............................................................................22
         9.5   Return Policy...........................................................................................22

10.      SCHEDULE E: TRAINING SERVICES.................................................................................23
</TABLE>

                                       3

<PAGE>   4

<TABLE>
<S>                                                                                                                     <C>
11.      SCHEDULE F: OEM VENDOR DELIVERABLES.............................................................................26

12.      SCHEDULE G: TROUBLE TICKET INFORMATION..........................................................................28

13.      SCHEDULE H: REPAIR AND RETURN INFORMATION.......................................................................29

14.      SCHEDULE I: TRAINING EQUIPMENT..................................................................................31
</TABLE>

                                       4

<PAGE>   5

1. DEFINITIONS

For the purposes of this Agreement the definitions set forth in the OEM
Agreement shall have the meanings specified in the OEM Agreement, and the
following additional terms shall have the meanings set forth below:

"ADDITIONAL SERVICES" shall mean all commercially available services offered by
a Party other than those Services described in SECTION 4.1.

"SLA AGREEMENT" shall mean this Service Level Agreement and all Schedules and
Appendices attached hereto as such are amended from time to time in accordance
with the provisions hereof.

"AUTHORIZED PERSONNEL" shall mean an individual

        (i) who is properly trained to repair the Product;

        (ii) who, in the opinion of the responsible Company or SIEMENS manager,
        exhibits sufficient Product expertise; or

        (iii) who is working under the direction of either Company or SIEMENS
        TAC.

"BUSINESS DAY" shall mean the local time of 8:00 AM to 5:00 PM, Monday through
Friday, excluding holidays, in the geographic locations where Company performs
Third Line Support.

"COST" means Company's actual cost of providing a Service, calculated as the
direct plus overhead costs of the functional group providing the Service,
averaged over a six-month period.

"FIRST LINE SUPPORT" shall mean the initial fault diagnosis procedures
undertaken by SIEMENS to identify and correct a hardware or software problem as
such functions and procedures are further defined in SCHEDULE A and in the
Operational Procedures.

"MAINTENANCE RELEASE" shall mean a software release or revision which provides
fixes to problems, but which does not generally provide new functionality. Such
release shall be represented by an incremented revision level x, where the
revision number is N.x

"MAJOR RELEASE" shall mean a software or hardware release or revision which
provides new functionality. Such release shall be represented by an incremented
revision level N, where the revision number is N.x

"MINIMUM FIELD REVISION LEVEL" shall moan the latest level of hardware or
software supporting all mandatory Engineering Change Order currently supported
in the field by Company.

"OPERATING PROCEDURES" shall mean the operating procedures to be followed by the
Parties in connection with the provision of the Services pursuant to this
Agreement, which operating procedures shall be developed by the Parties in
accordance with SCHEDULE C hereto.

"OEM AGREEMENT" shall mean the OEM Agreement entered into between SIEMENS and
Company dated.

"PURCHASER" shall mean the Party who is purchasing the Services from the other
Party.

"SECOND LINE SUPPORT" shall mean those Services to be provided by SIEMENS as
described in SCHEDULE A and in the Operational Procedures.

"SERVICES" shall mean the services to be provided by Company pursuant to this
Agreement..

"SUPPLIER" shall mean the Party who is providing the Services.

                                       5
<PAGE>   6

"TAC" shall mean either the Company Technical Assistance Center, the Company
Second Line Support organization, or the SIEMENS Technical Assistance Center as
appropriate.

"THIRD LINE SUPPORT" shall mean the Services to be provided by Company in
accordance with the functions and procedures specified in SCHEDULE A and in the
Operational Procedures.

"VERSION" shall mean a new release of Software which adds functionality, and
which is produced and licensed as a separate feature release of the Product.

"TRANSFER PRICE" shall mean the net price to SIEMENS including all applicable
discounts.

                                       6
<PAGE>   7

2. SERVICES TO BE PERFORMED

2.1 GENERAL SERVICES AND ADDITIONAL SERVICES

Subject to the terms and conditions of this SLA Agreement and the OEM Agreement,
Company shall provide to SIEMENS the Services set out in SECTION 4.1 hereof, and
such of the Additional Services as SIEMENS may request from time to time.

2.2 SERVICES NOT INCLUDED

Services do not include:

(i)   maintenance or repairs necessitated by an attempt by an individual who is
      not an Authorized Person to repair or maintain the Products;

(ii)  maintenance or repairs resulting from casualty, catastrophe, or natural
      disaster, accident, misuse, neglect or negligence of SIEMENS or a
      Customer, or causes external to the Products such as, but not limited to,
      failed or faulty electrical power or air conditioning, or any causes other
      than ordinary use;

(iii) maintenance or repairs of accessories, attachments or any other devices
      which do not adhere to Company's specifications;

(iv)  repairs resulting from unauthorized changes, modifications or alterations
      of or to the Product; and

(v)   the furnishing of optional accessories or consumable supplies not defined
      as the product in the OEM Agreement.

2.3 EXCLUDED SERVICES, SEPARATE AGREEMENT

The excluded services set out in SECTION 2.2 above, may be performed by separate
agreement between Company and SIEMENS. The price for the performance of any
excluded service shall be the Transfer Price.

                                       7
<PAGE>   8

3. COMMERCIAL TERMS

Pricing for the services below should be negotiated to support a 25% margin for
Siemens. For example: Siemens charges $165.00 per hour for TAC. The OEM hourly
rate should be no higher than $123.75 to ensure a 25% margin for Siemens.

3.1 PRICE FOR ADDITIONAL SERVICES

The prices for additional services are listed below. All reasonable travel,
lodging and meal expenses without mark up shall be reimbursed by Siemens to
Company.

[ ] Third Line Technical Support (On-Site) at $125.00 per hour

[ ] Contracted Installation Support at $125.00 per hour

The prices for other additional services will be negotiated.

3.2 WARRANTY

All elements of the OEM agreement are applied to this SLA agreement. The
warranty for the Product is described in Section VII of the OEM agreement and
applies directly to this SLA Agreement. In, addition sections 3.1 and 3.3 for
product change notification, 5.3 Packaging, Section IX Training, Section X
Documentation, Section XI Compliance, Section XII Term of the OEM Agreement,
Section XIV General Provisions are all included as an integral part of this SLA
Agreement.

The return authorization process outlined in Section H of this document
describes the input data and procedures for repair and return equipment.

3.3 COST OF OUT OF WARRANTY REPAIR/ADVANCED REPLACEMENT SERVICES

The repair for equipment out of warranty will be provided by Company at a net
price to Siemens of 35% of list prices shown on the Standard Price List.

3.4 TECHNICAL ASSISTANCE

Reasonable amounts of Technical Assistance (as described in SECTION 4.1.1) shall
be provided at no cost.

3.5 TECHNICAL SUPPORT FOR SOFTWARE

Except as specifically provided herein, technical support for Software shall be
provided at no charge for the then current Version and one previous Version.
Company reserves the right to charge $250 per hour for any research and
development efforts required for problem resolution for older Versions, not
covered under warranty or extended warranty, to be determined by Company on a
case by case basis.

                                       8
<PAGE>   9

4. COMPANY'S OBLIGATIONS

4.1 SERVICES TO BE PROVIDED BY COMPANY

Company shall provide the following Services:

4.1.1 TECHNICAL ASSISTANCE

Company shall provide basic help desk functions to assist SIEMENS in the
provision of those functions described in the Company/SIEMENS Operating
Procedures, SCHEDULE C as being First and Second Line Support functions.
Technical Assistance will be provided by Company's TAC during its normal hours
of operations: 8:00 am EST to 5:00 pm EST Monday through Friday. Twenty-four
hour support will be provided on a call out basis for out of normal hours. The
response times for technical support are outlined in SCHEDULE A.

4.1.2 TECHNICAL SUPPORT

4.1.2.1 THIRD LINE SUPPORT AND PROBLEM ESCALATION

Company shall provide Third Line Support as described in SCHEDULE A, and provide
problem escalation as described in SCHEDULE B.

4.1.2.2 SOFTWARE MAINTENANCE.

a)    Master copies of Maintenance Releases for Software and associated
      documentation will be provided free of charge when available. SIEMENS
      shall have the right to copy and distribute Maintenance Releases to its
      Customers as necessary to correct Software problems. Company shall also
      provide SIEMENS with patches as needed for distribution to specific
      Customers.

b)    Company shall provide SIEMENS' support organizations with any new Versions
      for their internal use only, except in the event that the correction to a
      Software problem (bug fix) is made only in a Version, in which case
      SIEMENS shall have the right to distribute the Version to its Customers at
      no charge.

c)    Company shall ensure that all new Versions will be compatible with other
      then-current Version of Product(s) in a network, and with one previous and
      one subsequent Version of Product(s).

4.1.2.3 COMPATIBILITY AND CORRECTION MATRIX

Company shall develop a compatibility matrix which will illustrate the effects
of a hardware or Software update on other cards, modules or Software in a
system. Company shall document the effect of a correction to a specific release
of Software on other releases of the same Software. Compatibility and correction
matrices shall be updated each time a change is made.

4.1.2.4 HARDWARE UPGRADES

During the warranty period set out in the OEM Agreement and the extended
warranty period, Company shall provide, free of charge, any upgrades required to
remedy a hardware design

                                       9
<PAGE>   10

problem. These upgrades shall be performed in accordance with the Repair and
Return process set out in SCHEDULE C. The frequency of these upgrades will be
reviewed on quarterly basis to ensure that the effort required by Siemens to
implement these upgrades is within reason.

Hardware upgrades outside of the warranty period, including those required
solely as a result of the installation of a new Software Version, are not
covered under this Agreement and must be purchased in accordance with the OEM
Agreement

a)    For products, within the warranty period, that require a hardware upgrade
      to support a software correction to a known problem or deficiency, Company
      will provide the hardware upgrade at no charge to Siemens.

b)    In the event of a network-wide hardware upgrade which is required as a
      result of a design fault, Company will devise a plan to provide buffer
      stock as temporary replacements during the upgrade.

At all times, Company shall provide hardware for "Class A" changes as defined in
Bellcore TR209 or equivalent at no charge to Siemens.

4.1.2.5 SUPPORT OF OLDER RELEASES

Company shall provide Problem Resolution as described in SCHEDULE A for the
then-current Version of a Product, and for one preceding Version. Support for
Versions of a Product which precede a current Version by two Versions, shall be
agreed to on a Product by Product basis. Company may agree to provide support
for older Versions not covered under the preceding sentence, on a case by case
basis.

4.1.2.6 SPORADIC MALFUNCTION

In the case of sporadic malfunction of the Products, Company agrees to dispatch
the appropriate resources to investigate the malfunction. Subject to SECTION
2.2, Company shall use reasonable efforts, which may include Product upgrades,
replacements or "work-arounds", to correct any problem with the Products which
is identified as the cause of the sporadic malfunction. For the purposes of this
SECTION 4.1.2.6, "sporadic malfunction" shall mean any non-reproducible,
intermittent problem which results in a temporary cessation in Product
functionality. Sporadic Malfunctions will be escalated in accordance with the
Management Escalation Process set out in SCHEDULE B.

4.1.2.7 EPIDEMIC FAILURE

Company agrees to repair Products associated with an epidemic failure. In the
event Products covered by warranty experience an epidemic failure and Company
elects not to repair or replace such Products, Company shall refund the
un-depreciated purchase price paid by Siemens for such Products if such Products
were delivered within three (3) years of failure and were purchased more than
three years prior to failure. Epidemic failure shall mean the same material
failure or material specification non-conformity of the Product occurring due to
the same specifically identified cause to more than 5% of installed Product
within three months, in warranty or extended warranty.

4.1.2.8 UNDETERMINED PROBLEMS

If, during the term of this Agreement, network problems arise which cannot be
attributed to a specific Product, Company shall promptly investigate the
problem. If the problem is found to result from the integration or
inter-networking of the network, the parties shall work together in

                                       10
<PAGE>   11

accordance with the Management Escalation Process set out in SCHEDULE B to
achieve a mutually acceptable solution.

4.1.2.9 DESIGN REQUIREMENTS

Company shall use reasonable efforts to ensure that any Maintenance Releases and
patches are designed such that they may be incorporated into a Customer's
network with minimum disruption of network operations. Wherever possible,
updates and upgrades will be suitable for remote installation.

4.1.3 DOCUMENTATION

Company will provide to SIEMENS all available Product documentation required to
service and support the Products, including those documents set out in SCHEDULE
C hereto. SIEMENS shall have the right to use the documentation for the purpose
of providing service and support to its Customers as provided under this
Agreement.

Access to information marked confidential in accordance with the preceding
sentence will not be-unreasonably denied by Company. SIEMENS may copy the
documentation for internal distribution only as necessary for the purpose of
exercising its rights under this SECTION 4.1.3, and all copies shall include all
Company proprietary rights legends contained in or on the original document. All
documentation disclosed by Company hereunder shall be subject to the
confidentiality provisions set out in SECTION 2 of the OEM Agreement.

4.1.3.1 COMMERCIALLY AVAILABLE DOCUMENTATION.

In addition to the OEM Agreement, Company shall provide one set in hard Copy
format and one master copy in electronic format of all technical practices,
marketing materials, and other commercially available documentation. (The term
"format" used above indicates any current commercially available desktop
publishing tool such as MS Word, Adobe FrameMaker, etc.). Additionally, for the
purposes of this SECTION 4.1.3, "commercially available" documentation means
that generally available documentation that has been assigned a Company part
number. The medium for delivering the "electronic media" should be a current
commercially available medium such as Iomega Zip 100 disk(s), ISO 586 Compact
Disk (CD), or via an FTP site using any commercially available FTP client such
as WS-FTP, or MS Windows FTP, etc. using a Siemens maintained FTP site as the
host repository.

Company will also provide to Siemens all available Customer Documentation
required for product service and support. Siemens shall have the right to use
the documentation for the purpose of providing service and support to its
Customers as provided under this Agreement.

Company will make available to Siemens, as soon as it is internally (or under
internal review) available, any documentation, which is not commercially
available, including all updates and upgrades for customer documentation in
electronic format at first availability (including drawings, and functional
specifications, etc.).

            The documentation will include, but is not limited to:

                  -     Engineering and Planning Guides

                  -     User Guides Operations

                  -     Operations and Administration Manuals

                  -     Network Management Manuals

                  -     Installation Manuals

                  -     Acceptance Test Manuals

                                       11
<PAGE>   12

                  -     Installation Quick Reference Guides

                  -     Product Change Notice

                  -     Operator Hints

                  -     Technical Bulletins

                  -     Hardware Functional Descriptions

                  -     Maintenance Manuals

                  -     Event, Diagnostic, and Error Manuals

                  -     Service Specifications (Frame Relay, DXI, ATM, etc.)

                  -     System Descriptions *

                  -     Sales and Marketing Brochures

                  -     Customer Service Procedures

                  -     OEM Vendor Documentation

Company will provide to Siemens advance notice of documentation updates and
upgrades (revisions and new releases) by including Siemens in the Company
internal review cycle for customer documentation, for review of documents.
Siemens' suggestions shall not obligate' Company to incorporate changes. Siemens
will be provided with this information electronically via a Siemens maintained
File Transfer Protocol (FTP) site. Furthermore, COMPANY will employ the use of
"change bars" or other visual label to indicate changes from a previous issue.

Siemens will have the right to modify, change, edit, add, delete, and reformat
the provided customer documentation (without changing the content or the intent)
into electronic documentation to suit Siemens customers' requirements, and
Siemens shall assume full responsibility for all such changes made.

4.1.3.2 ELECTRONIC BULLETIN BOARD ACCESS

SIEMENS shall have full access to Company's then current electronic bulletin
boards and World Wide Web pages which contain Company technical information and
Product documentation. Such materials shall include information describing
features contained within a new Product feature release, engineering changes
made to the Products, configuration assistance, application documentation,
procedures for performing firmware and Software upgrades.

All of SIEMENS's engineers who perform the second line support function may have
access to the electronic bulletin board and any restricted support-related
information contained in the World Wide Web pages on a "need to know" basis for
support and training purposes only, including downloads of any such information
as Company may make available on compact disk from time to time. Access to
restricted information in accordance with the preceding sentence shall not be
unreasonably denied by Company.

4.1.4 HARDWARE REPAIR

a)    Access to Company's repair service will be provided at no charge through
      the appropriate Company service location, during its normal business hours
      (8:00 am EST to 5:00 pm EST). Services will be provided in accordance with
      the Repair Procedures described in SCHEDULE D attached hereto.

      No Products may be returned without prior authorization from Company,
      which authorization shall not be unreasonably delayed or withheld as
      outlined in SCHEDULE H.

b)    Siemens will provide a trouble report with the returned product. The
      trouble report is attached as SCHEDULE G.

c)    Company will provide three types of Repair Services during a five (5) day
      by twenty-four (24) hour availability:

                                       12
<PAGE>   13

I.    ADVANCED REPLACEMENT - DEAD-ON-ARRIVAL

      This is a replacement service for "Dead On Arrival" or "'infant
      Mortality", which refers to those Products which fail within 30 days of
      shipment from Company. Company will use commercially reasonable efforts to
      ship an equivalent new replacement Product, via overnight carrier, within
      one (1) Business Day of request. SIEMENS shall ship the defective Product
      to Company within thirty days of receipt of the replacement Product.

II.   ADVANCED REPLACEMENT LOAN

      This is an emergency loan service for both in-warranty and out-of-warranty
      Products that are not considered Dead-On-Arrival or an Infant Mortality.
      Company will use commercially reasonable efforts to ship an equivalent
      replacement Product, via overnight carrier, within one (1) Business Day of
      request. In such an event, SIEMENS shall establish an open purchase order
      for a limited dollar amount to cover the purchase for the replacement
      Product and pay Company's then-current repair charges, freight charges and
      an agreed order expedite fee in respect thereof. SIEMENS shall ship the
      defective Product to Company within thirty days of receipt of the
      replacement Product. The open purchase order will be reviewed on a
      quarterly basis and adjusted accordingly.

III.  REPAIR AND RETURN

      This is the standard repair service for both in-warranty and
      out-of-warranty Products which fail in service. SIEMENS shall return the
      faulty unit to Company for repair in accordance with the Return and Repair
      procedures set out in this Agreement and SCHEDULE D attached hereto.
      Company shall also ensure that all returned Products are brought up to the
      Minimum Field Revision Level at no additional charge. The upgrade to
      Minimum Field Revision will be determined as follows:

      Siemens will define where the Products are to be returned to: Customer's
      spares pool or Siemens stock. If to the customers spares pool, Company
      will utilize the compatibility matrix to determine the Minimum Field
      Revision level. If to Siemens stock the Company will upgrade the Product
      to the Minimal Field Revision level.

            A)    Company will either repair or, at its option, replace
                  defective Products covered under warranty within fifteen (15)
                  Business Days of its receipt. The new warranty period for
                  repaired or replaced Products shall be the remainder of the
                  original warranty period or ninety (90) days on hardware and
                  thirty (30) days on software, whichever is greater, measured
                  after ten (10) business days from the date of return shipment.
                  SIEMENS will ship Products to Company at SIEMENS's expense.
                  Company will ship the repaired or replacement Products surface
                  freight to SIEMENS at Company's expense. Expedited freight
                  shall be at SIEMENS's expense.

            B)    Company will either repair or replace, at SIEMENS' option and
                  cost, defective Products not covered under warranty, within
                  fifteen (15) Business Days of receipt. The new warranty period
                  for repaired or replaced Products shall be three months (90
                  days) for hardware and one month (30) days for software,
                  measured after ten (10) business days from the date of return
                  shipment. SIEMENS will ship Products to Company at SIEMENS's
                  expense. Company will ship the repaired or replacement
                  Products surface freight to SIEMENS at Company's expense.
                  Expedited freight shall be at SIEMENS's expense.

            C)    If a Product is returned for repair three (3) times within the
                  warranty period, other than for reasons set out in SECTION
                  2.2, Company shall replace the Product with a new Product or
                  new equivalent Product at no charge to SIEMENS. The new
                  Product shall be warranted as new as established in the OEM
                  Agreement.

                                       13
<PAGE>   14

4.1.5 REPAIR ALTERNATIVES

In the event Company is unable or unwilling to provide repair or replacement
service, except in the events covered in the SECTION 14.11 (of the OEM
agreement) CONTINGENCY, and is unable to obtain another source or repair for
Siemens, then Siemens will require Company, for a reasonable fee, to provide
Siemens with the technical information solely for Siemens' use in the repair of
the Product.

The technical information includes, by example and not by way of limitation: (a)
manufacturing drawings and specifications including circuit pack schematics; (b)
manufacturing drawings and specifications covering special tooling and the
operation thereof; (c) a detailed list of all-commercially available parts and
components purchased by Company on the open market disclosing the part number,
name and location of the supplier; and (d) repair specifications and test
procedures, as available.

If Product is returned to Company for repair as provided for in this section,
and is determined to be beyond repair, or repair costs are expected to exceed
fifty percent (50%) of the cost of a replacement, Company shall so notify
Siemens. If requested by Siemens, Company will sell to Siemens a replacement at
the current agreement price or, if no such agreement exists, at a price agreed
upon by Company and Siemens. Further, if requested-by Siemens, Company shall
take the necessary steps to dispose of the unrepairable Product consistent with
sound commercial practices. All transportation charges for and risk of
in-transit loss or damage to Product returned to Company for repair under this
Section will be born by Siemens. All transportation charges associated with the
return of such repaired and replacement Product to Siemens will be borne by
Company. Company shall bear the risk of in-transit loss and damage for shipments
to Siemens on repaired or replaced Product.

To facilitate the repair of Product, Siemens may contact Company with any
questions that may arise concerning Repair Services and, if required, specify
any special packing of Product that might be necessary to provide adequate
in-transit protection from transportation damage. Company will provide packing
material for the equipment to be returned.

Company may require that Siemens furnish the following information with Product
returned to Company for repair as outlined in SCHEDULE H.

Product repaired by Company shall have the repair completion date and RMA number
stenciled or otherwise identified at a readily visible location on the Product
packaging and the repaired Product shall be returned with a tag or other papers
describing the repairs which have been made with sufficient detail to identify
replaced components.

All invoices originated by Company for repair services must be clearly
identified as such, and must contain: (a) a reference to Siemens' Purchase
Order, requisition or RMA for these repair services, (b) a detailed description
of repairs made by Company and the need therefore, and (c) an itemized listing
of parts and labor charges, if any. If Siemens so requests, all replaced parts
will be returned to Siemens.

4.1.6 REFURBISHMENT

At the request of Siemens, and at a mutually agreed to price, Company shall
refurbish Product provided by Siemens for reuse. Refurbishment includes
maintenance necessary to return the Product to a "like-new" operational and
appearance condition that is suitable for its sale by Siemens.

                                       14
<PAGE>   15

4.1.7 PRODUCT AVAILABILITY

Company agrees to offer for sale to Siemens, for a period of five (5) years
after the expiration date of this agreement, or any subsequent renewal
agreement, but not to exceed five (5) years after discontinuation of the
product, functionally equivalent maintenance, replacement, and repair parts.
Such parts shall be priced at the then current agreement price, or if no such
agreement exists, at a price agreed upon by Parties.

In addition, should Company decide, during the life of this Agreement, to
discontinue manufacturing Product, Company shall give at least nine (9) months
prior notice to Siemens of such manufacture discontinuance to permit Siemens a
last time buy opportunity.

4.1.8 EXTENDED WARRANTY CONTRACT

Extended Warranty is a contracted extension of Company's original equipment
warranty, which lengthens the original warranty for a period of one (1) year.
Under the Extended Warranty program, Siemens continues to be eligible to return
products to Company for repair free of charge. Company will make available to
Siemens a discounted repair and return service. Such Extended Warranties to
SIEMENS's customers, on request by SIEMENS, at SIEMENS's expense

Company will offer the option to renew the extended warranty (at a mutually
agreed upon price) on an annual basis as long as the Product is being
manufactured by Company and the SLA is in force. If the Product is discontinued,
Company will provide an extended warranty for the 5 year continued support
window.

4.1.9 REPORTS

Company will provide reports to SIEMENS, on a quarterly basis, as specified in
the Operating Procedures (SCHEDULE C). These shall include, but shall not be
limited to, Hardware, Software and System reports detailing repair turnaround
times, fault measurements, card capture data, data on all returned failures,
problem resolution status, and quantitative data on problem reporting.

Company and Siemens will hold quarterly meetings to review inter-working
processes, quality issues, key indicators and customer services business issues.

4.2 PROBLEM RESOLUTION TIME FRAMES

Notwithstanding any other provision of this Agreement, the Problem Resolution
time frames set out in SCHEDULE A shall apply only to commercially available
versions of the Products.

4.3 ADDITIONAL SERVICES

4.3.1 REQUEST FOR ADDITIONAL SERVICES

Subject to the terms and conditions of this Agreement, SIEMENS shall be entitled
to request that Company provide any of the Additional Services. Additional
services may be provided to SIEMENS or directly to the Customers as
subcontractors of SIEMENS company may not otherwise provide Services directly to
SIEMENS's Customer without the express written consent of SIEMENS. Not all of
the Additional Services are available in all areas of the world.

                                       15
<PAGE>   16

5. SIEMENS' OBLIGATIONS.

5.1 TEST EQUIPMENT AVAILABILITY

Unless otherwise expressly agreed, SIEMENS shall ensure that it has test
equipment available for testing the Products at each of its Second Line Support
locations which is equivalent to that used by Company to test the Products. In
addition, SIEMENS's Second Line Support personnel shall have access to such
laboratory equipment as necessary to provide their Customers with assistance,
and to be able to reproduce problems with the Products

5.2 ADEQUATE TRAINING FOR FIRST AND SECOND LINE SUPPORT INDIVIDUALS

SIEMENS shall ensure that each of the individuals within its organization and
its distribution channel who are responsible for providing either First Line
Support or Second Line Support have been adequately trained, on an on-going
basis, in the Products, technology they are required to support in accordance
with Schedule E.

5.3 SPARES

SIEMENS shall maintain an appropriate number of spares for each of the Products,
or shall acquire spares through the Advanced Replacement Loan Service described
in SECTION 4.1.4(C)(II), in order to effectively support its installed Customer
base. Company warrants and discloses the ability to substantiate sparing levels.

5.4 ADEQUATE SUPPORT PERSONNEL

SIEMENS shall provide sufficient authorized personnel to support the Customer.

                                       16
<PAGE>   17

                                   SCHEDULE A
                           PROBLEM RESOLUTION SERVICES

6. SCHEDULE A: PROBLEM RESOLUTION SERVICES

A.1 PROBLEM RESOLUTION

A.1.1

In connection with the resolution of problems, SIEMENS shall provide First and
Second Line Support of the Products to its Customers in accordance
Company/SIEMENS Operating Procedures SCHEDULE C reference. Before escalating a
problem to Company Third Line Support, SIEMENS shall have completed all of the
functions and procedures described herein and in SCHEDULE B for both First and
Second Line Support.

A.1.2

In providing Second Line Support, SIEMENS shall provide detailed in-depth
problem analysis, problem duplication as well as those functions described in
SCHEDULED H and the Company/SIEMENS Operating Procedures as being Second Line
Support functions. Problems that cannot be resolved by SIEMENS's Second Line
Support Organization(s) shall be referred to Company in accordance with SECTION
A.1.4 for Third Line Support. Only those individuals identified to Company as
Primary Technical Contacts in accordance with SECTION A.1.4 hereof shall be
entitled to escalate a Problem to Company for Third Line Support.

A.1.3

Company is Third Line Support. Third Line Support shall mean the provision of a
correction or a work around to a problem which SIEMENS is unable to provide
through the provision of First and Second Line Support. Company shall perform
those functions described in the Company/SIEMENS Operating Procedures as Third
Line Support functions. Third Line Support shall normally not include the
provision of any hardware that may be required to support a new software
release, nor the labor to install a new software load.

A.1.4

Upon execution of a non-disclosure Company shall provide SIEMENS with access to
a designated individual or individuals within the TAC, which individual or
individuals shall be Company's Primary Technical Contact(s). SIEMENS shall also
have access to the call tracking database systems to electronically report
problems and requests for information, and no less than "read" access to
Company's Customer support problem tracking system. Company's Primary Technical
Contact(s) shall be SIEMENS's point of contact to Company's support
organization. Company's Primary Technical Contact(s) shall make the final
confirmation of the problem analysis and formally escalate the problem to
Company's R&D for resolution. The problem will be assigned a priority in
accordance with the provisions of SECTION A.2 hereof. The Parties shall advise
each other of the names of the Primary Technical Contacts in their respective
support organizations. The Parties may from time to time change the Primary
Technical Contact individuals by giving notice to the other Party, provided
however, any replacement Primary Technical Contact shall be sufficiently
trained, as described herein, to fulfill the functions of such position.

                                       17
<PAGE>   18

A.2 PROBLEM PRIORITY CLASSIFICATION

A.2.1

SIEMENS may request a specific priority classification of a problem or Request
for Information. If the Parties disagree on the classification of a particular
Problem or Request for Information, Company's and SIEMENS's Primary Technical
Contacts shall endeavor to agree on the classification of a problem. If
Company's and SIEMENS's Primary Technical Contacts are unable to agree, the
matter will be escalated in accordance with SCHEDULE B - Management Escalation
Process to ensure resolution. Problem shall be classified into one of the three
(3) following categories for issues related to trouble reports: Critical, Major,
and Minor. A fourth category, Query or Question, is a request for information
which is not directly related to a service outage or problem. In the event that
SIEMENS reports a problem that is determined by Company's R&D staff to be either
outside of the documented functional specification of the Product, or in respect
of a Product that is functioning in accordance with the documented functional
specification, Company reserves the right to request that the problem status be
changed to a 'Design Change Request', in which case Company will treat it as a
change in feature content rather than a problem. The Parties will work together
to come to a reasonable resolution and escalate the issue in accordance with
SCHEDULE B - Management Escalation Procedure.

Priority Definitions for reporting Problems and Requests for Information to
Company are as follows:

CRITICAL

Emergency Problems are those that result in:

-     A total system failure that results in the loss of all transaction
      processing capability (e g connection setup, data transmission)

-     Significant reduction in capacity or traffic handling capability

-     Any loss of safety or emergency capabilities

-     Loss of systems ability to perform automatic system reconfiguration

-     Inability to restart a processor or the system

-     System related loss or severe degradation of one or more primary
      rate/aggregate spans or connections

-     Loss of access for maintenance or recovery operations

-     Loss of the system's ability to provide any required Emergency or Major
      trouble notification

-     Total loss of a material feature or functionality that impacts the
      operation of the Product

MAJOR

Major problems are those that result in:

-     Emergency problems in which there is an acceptable work around in place

-     Degradation in capacity or traffic handling capability

-     Degradation of system's ability to perform automatic system
      reconfiguration

-     Difficulty restarting a processor or the system

-     Any loss of functional visibility and/or diagnostic capability

-     Short system or subsystem outages, whose duration accumulates to greater
      than 2 minutes in any 24 hour period, or that continue to repeat during
      longer periods

-     Prevention of access for routine administrative activity

-     Significant degradation of the system's ability to provide any required
      Emergency or Major Trouble notification

                                       18
<PAGE>   19

-     Significant degradation of a material feature or functionality that
      impacts the operation of the Product

MINOR

Minor problems are those that result in:

-     Degradation of access for routine administrative capability

-     User interface problems for network management that are not service
      affecting.

-     Any problems that are not safety related on non commissioned equipment.

-     Any other problems that do not result in the loss or degradation of a
      material feature or functionality

QUERY OR QUESTION

A fourth class, Query or Question, is a request for information which is not
directly related to a service outage or problem. This may include:

-     Requests for assistance in the installation or configuration or a system
      or subsystem

-     Requests for documentation pertaining to a system or subsystem

A.4 COMPANY RESPONSE TIME COMMITMENTS - (FOR THIRD LINE SUPPORT 7X24)

A.4.1 Call Response Time

Call Response Time is defined as the elapsed time between the reporting of a
Problem by SIEMENS and the time a Company Third Line technical support
specialist contacts SIEMENS. Call Response Time is monitored and is used to
trigger escalation. Company will use reasonable efforts to meet the Call
Response Times specified below for each Priority Level.

<TABLE>
<CAPTION>
Priority Level                     Response Time Commitment
--------------                     ------------------------
<S>                                <C>
Critical                           Thirty (30) minutes at all times.
Major                              Within one (1) hour at all times.
Minor                              By the next Business Day for calls received in the Business Day Query
                                   By the next Business Day for calls received in the Business Day
</TABLE>

A.4.2 Restore Time

Restore Time is defined as the elapsed time between the reporting of a Service
Affecting problem by SIEMENS and the time Company provides an acceptable work
around or returns the Product to a level of operation that is acceptable to the
Customer. Company will use reasonable efforts to meet the Restore Times
specified below for each Priority Level.

<TABLE>
<CAPTION>
Priority Level                     Response Time Commitment
--------------                     ------------------------
<S>                                <C>
Critical                           Less than or equal to 24 hours.
                                   Company will use all commercially reasonable efforts to restore the
                                   affected Product as soon as possible.
Major                              Less than or equal to Three (3) Business Days.
Minor                              Not Applicable
Query                              Not Applicable
</TABLE>

                                       19
<PAGE>   20

                                   SCHEDULE B
                         MANAGEMENT ESCALATION PROCEDURE

7. SCHEDULE B: MANAGEMENT ESCALATION PROCEDURE

The purpose of any escalation procedure is to ensure that unresolved problems
are brought to the appropriate levels of expertise and management for attention
and action. This includes, but is not limited to, problems not resolved in the
time frames as indicated in SCHEDULE A (Problem Resolution Process), problems
whose priorities can not be agreed to, problems that turn into design change
requests, undetermined problems, and sporadic problems.

For the purposes of this process, escalation time frames to the OEM levels of
management are determined by the requested prioritization of the problem. This
escalation process is for post sales support of hardened product at a Customer
site and is not intended for use during lab evaluation of beta or in field trial
loads of Product, nor is it intended for use where there is an acceptable
proposal for service restoration.

After the Customer reports the problem, it is the responsibility of the Second
Line support organization to begin the problem resolution process and to
escalate unresolved problems in, a timely and accurate manner.

The Management Escalation process should involve parallel escalation within both
SIEMENS and Company to insure that both companies are escalating unresolved
issues simultaneously.

It is also the intent of this escalation procedure to properly report escalated
issues to non-service groups within the Company and SIEMENS companies.

A list of the names of the "Manager(s)", along with their associated phone
numbers, will be kept up to date and shared between SIEMENS and Company on a
regular basis.

                                       20
<PAGE>   21

                                   SCHEDULE C
                              OPERATING PROCEDURES

8. SCHEDULE C: OPERATING PROCEDURES

Company and SIEMENS will participate in the development of ISO 9000 procedures
to define and/or update the existing the processes and procedures for the two
companies to interact. Writing procedures required by SIEMENS to interface to
existing processes of Company will be the responsibility of SIEMENS with
assistance of assigned 'content experts' from Company. Writing procedures that
cause change in both company's present practices will be done jointly, utilizing
prime contacts within each organization as appropriate.

Documents will be written to include, but not be limited to, the following
processes and procedures:

-     Ordering and scheduling services

-     Training and course development

-     Problem notification between the two organizations

-     First, second, and third line support

-     Installation and commissioning

-     Network integration

-     Site and network engineering

-     Repair and return, including hardware modification, hardware/software
      upgrade

-     Service logistics, including hardware inventory and management

-     System and network upgrade

-     Advance Replacement

-     Software Release and software patch distribution

-     New Product Introduction

-     Problem Escalation

                                       21
<PAGE>   22

                                   SCHEDULE D
                             REPAIR AND REPLACEMENT

9. SCHEDULE D: REPAIR AND REPLACEMENT

9.1 REQUESTS FOR RETURN.

All requests for return of Products or for Advance Replacement of Products
should be made to Company. Siemens will provide all necessary information for
processing the return and issuing a Return Authorization (RA) number.

9.2 SHIPPING OF DEFECTIVE PRODUCTS

Defective Products must be returned by SIEMENS in static protective material,
securely packaged to prevent damage in transit, and shipped prepaid with the RMA
Number written on the outside of the package. If to Company, shipment should be
made to:

Accelerated Networks
Attn: Customer Service
301 Science Drive
Moorpark Ca. 93021

If to SIEMENS:
900 Broken Sound Parkway
Boca Raton, Florida, 33487

9.3 REPAIR AND RETURN

Company will either repair or replace, at its option, defective Products and
return them to SIEMENS's point of origination.

9.4 RETURN DIRECTLY TO COMPANY.

Upon written request by SIEMENS, Company may permit SIEMENS's Customers to
return defective Products directly to Company for repair or replacement.
Permission shall be granted on a case by case basis, at Company's discretion.

9.5 RETURN POLICY.

Siemens will return the defective Products within 30 days of receipt of
replacement Product. Failure to return the defective Product will result in
Company invoicing Siemens at the transfer price.

                                       22
<PAGE>   23

10. SCHEDULE E TRAINING SERVICES

E.1 General

COMPANY and Siemens agree to participate in training programs and provide access
to personnel, materials and other resources in a manner consistent with the
co-operative spirit of their relationship.

E.1.1 Geographic Considerations

For the North American market, the "Train the Trainer" Program of this agreement
will apply to the following training organisations only: Siemens Information and
Communication Networks Training Center in Boca Raton, FL, and COMPANY. New
locations may be added upon mutual consent. Other Training Services listed
herein will be available on a global basis.

E.2 Courseware and Materials

COMPANY will deliver to Siemens and grant the right to Siemens to use all
available materials, courseware, tools, Lecture Based, Computer Based and Web
Based Training (LBT, CBT and WBT) packages developed by Company's training
department and/or the use of contractors by COMPANIES training development
services for any feature release of the products listed in this agreement and
the associated technologies FREE OF CHARGE. Siemens will have the right to
reproduce these materials without any restriction for training purpose only, as
long as no copyright, trademark or other rights of third parties are affected.

Access to training materials, courseware, and tools for any other products or
other general capabilities provided by either training organization may be
agreed to, either in other Service Level Agreements between COMPANY and Siemens,
or on a case by case basis by COMPANY and Siemens.

E.3 Standard Training Courses

COMPANY agrees to offer training courses on all its Products covering the
following categories, overview, installation, administration and operations,
planning and engineering, and maintenance of their Products. These courses will
be available at any of the COMPANY training facilities around the world or at
customer locations (suitcase classes). The training courses for the Products
listed in the agreement and the associated technologies will be offered in
English. All final training materials available will be provided to Siemens at
least one month prior to release of product for the first customer trial
/installation. Draft versions will be provided at appropriate time prior to
start of NIST to expedite ramp-up of Siemens trainers.

COMPANY will provide Siemens personnel and/or Siemens Customers with the
instructional delivery of all Training Courses for the Products listed in the
agreement and the associated technologies that are available at the time of
request from COMPANY. If required by Siemens, COMPANY will offer the delivery of
a requested training course not later than 2 months after the time of request
for that course. The cost for Siemens will be at a 50% off of list price for
Siemens personnel, and 25% off of list price for Siemens' Customers.

Hands-on training for up to 6 Siemens personnel (typically, TAC/FS or Train the
Trainer personnel) working with COMPANY TAC personnel will also be provided by
COMPANY prior to and during the system test phase (the final test phase before
first customer installation) for each Major Release of the products sold to
Siemens for the purpose of enabling the service department of Siemens. This
training will consist of formal and informal classroom instruction, actual
hands-on training in laboratory environments, and one-on-one training with
Company's technical support organization.

                                       23
<PAGE>   24

E.4 Customised Training Courses

In addition to Company's regularly scheduled training classes, arrangements for
the delivery of customised training courses can be initiated by contacting one
of Company's training facilities. Such courses can be arranged to be held at
either a COMPANY facility or at a Customer site and may be made available to
Siemens upon request.

This offering provides for specialised training that is targeted to the specific
needs of the individual Customer. Each class is developed according to the
specific requirements of the individual Customer. Prices for development and
delivery of such customised training are to be negotiated between the parties at
the time of request by Siemens.

E.5 Train-the-Trainer Program

Details of a "Train-the-Trainer" program for Siemens personnel are as follows:

      SIEMENS will be provided with the necessary knowledge enabling for two
      SIEMENS instructors to teach Overview, Installation, Operations and
      Administration, Planning and Engineering, and Maintenance to customers of
      the COMPANY Products sold by SIEMENS. The following training will occur at
      COMPANY's location, unless mutually agreed otherwise by the Parties.

      This knowledge enabling will include, but is not limited to, the two
      SIEMENS Instructors sifting through each of the COMPANY courses to be
      delivered at least twice plus access to COMPANY SME's for questions (if
      required). This will then be followed by a PILOT Course presentation by
      the SIEMENS instructors done with the COMPANY instructor present.

      This will be in effect for the current course offerings and any subsequent
      new course offerings of the products included within this agreement.

      For subsequent Major Releases, SIEMENS instructors will be allowed to sit
      in the initial pilot and delta pilot offerings of each updated course. It
      will then be the responsibility of that instructor to update their
      respective organizations.

      The knowledge enabling process will also include the participation of at
      least one (1) Instructor in the installation and commissioning of each of
      the COMPANY Products that SIEMENS will be supporting.

      COURSE MATERIALS:

      SIEMENS will be provided, at no charge, a copy of all course materials in
      electronic format. These materials will include, but will not be limited
      to student guides, student exercises, training lab information, student
      job aids, transparencies, presentation materials, and instructor guides,
      as available.

      Siemens will be responsible for upgrading its own training materials for
      each subsequent product release. SIEMENS will continue to be provided with
      all updates and upgrades to the (above) course materials by the completion
      of Companies System Test.

      At no charge, SIEMENS will be allowed to use the supplied course materials
      to instruct SIEMENS customers. This will include the ability to reproduce
      and provide the student portions of these materials to the customer.

      At no charge, SIEMENS will be allowed to reformat any of the course
      materials as deemed necessary to meet customer expectations/requirements.

                                       24
<PAGE>   25

      At no charge, SIEMENS will be allowed to change and use the presentation
      media of the originally provided course materials. This will include but
      is not limited to: electronic presentation, CBT, video presentation, or
      mixed-media.

      COMPANY INSTRUCTED CLASSES

      SIEMENS will have the option to enroll its customer students into
      COMPANY-taught training classes held at either Company's or Siemens'
      training facilities, subject to availability.

      COMPANY and Siemens agree to participate in training programs and provide
      access to personnel, materials and other resources in a manner consistent
      with the co-operative spirit of their relationship.

                                       25
<PAGE>   26

11. SCHEDULE F OEM VENDOR DELIVERABLES

The following deliverables are required for each new product release.

<TABLE>
<CAPTION>
DUE DATE                                     ACTIVITY
--------                                     --------
<S>                                          <C>
                                             SYSTEM TEST PLANS

At start of System test

                                             System test plans submitted to Siemens Training Courses list and description

15 Days prior to NITS                        System test plans completed with documented results Training Courses availability
                                             schedule

Start: FOAIS - 90 days                       NETWORK INTEGRATION TESTING Pilot Training Courses
Complete: FOAIS - 30 days

NITS - 60 days                               Company will deliver a list of test equipment, Documentation list and description
                                             required for Network Integration testing.

NITS - 15 days                               Company will deliver on-schedule, lab equipment (Products) necessary for Siemens
                                             to conduct network integration testing, along with a Documentation availability
                                             schedule.

NITS through completion                      Company will provide sufficient technical support (on-site) to enable Siemens
                                             network integration testing for new product deployments.

                                             TRAINING AND COURSE DEVELOPMENT

FOATC                                        Formal Training Courses available per semester

                                             DOCUMENTATION

NIST                                         Released Documentation

FOATC + 30 days                              Customer Deliverable Documentation

                                             TROUBLE TICKET HANDLING

FOAIS - 60 days                              Define trouble ticket tracking and status tools for the Company

FOAIS - 30 days                              Implement trouble tracking tools and procedures

FOAIS - 30 days                              Provide Siemens with documentation describing Company's Trouble Tracking Procedures.
FOAIS                                        Company will provide Siemens with electronic access to the trouble tracking system
                                             for status of all tickets and all technical alerts.

                                             THIRD LEVEL SUPPORT

FOAIS - 30 days                              Company will have implemented Tier III support procedures as outlined in the SLA

FOAIS - 30 days                              Company will define and publish escalation lists including phone numbers and pager
                                             numbers

FOAIS                                        Company will adhere to response times defined in the SLA

                                             SITE AND NETWORK ENGINEERING

FOAIS - 60 days                              Company will provide engineering data for equipment described in the OEM agreement.
</TABLE>

                                       26
<PAGE>   27

<TABLE>
<S>                                          <C>
                                             REPAIR AND RETURN, INCLUDING HARDWARE MODIFICATION, HARDWARE/SOFTWARE UPGRADE

FOAIS                                        Company will provide sufficient equipment to implement the repair and return
                                             procedures as specified in this SLA.

                                             COMPANY'S EQUIPMENT DELIVERIES

FOAIS                                        Company's equipment deliveries to Siemens customers will be on schedule per the
                                             mutually agreed upon delivery commitments to the customer order.
</TABLE>

1.    NITS = Network Integration Testing Start Date

2.    FOAIS = First Office Application Installation Start Date

3.    FOATS = First Office Application Testing Start Date

4.    FOATC = First Office Application testing Completed

                                       27
<PAGE>   28

12. SCHEDULE G TROUBLE TICKET INFORMATION

Problem Resolution will start with the initialization of a Trouble Ticket that
will be tracked to closure. Siemens Second Line Support personnel will be given
both read and write access to the Company's trouble ticketing system. The
information provided will be key to determining the nature of the problem and as
needed escalating the problem into the Company's R&D for resolution. Restoration
time frames and priority will begin after the confirmation of the problem
analysis. The minimal information needed to open a trouble ticket and begin the
Problem Resolution is as follows:

-     Person reporting the problem and contact information

-     Product with detailed model number

-     Serial number of unit

-     Detailed configuration of the product

-     Application information Network Diagram showing all connectivity

-     Detailed Description of the problem

-     The frequency of the problem and reproducibility

-     Severity of the problem

-     Any additional information required to aid in the reproduction of the
      problem

                                       28
<PAGE>   29
13. SCHEDULE H REPAIR AND RETURN INFORMATION

CUSTOMER SERVICE RMA FORM

<TABLE>
<S>                                                                                                   <C>
                                                                                                          Who
RMA NUMBER                               __________________________________________________________     Company

DATES
RMA request received                     __________________________________________________________     Company
RMA issued                               __________________________________________________________     Company
Equipment arrived
Repair start                             __________________________________________________________     Company
Repair complete
Return shipment                          __________________________________________________________     Company
                                         __________________________________________________________     Company
RMA closed
                                         __________________________________________________________     Company

CONTACT INFORMATION
RMA requested by                         __________________________________________________________     Siemens
RMA issued by                            __________________________________________________________     Company
ASC technical contact                    __________________________________________________________     Company
ASC ship-to contact                      __________________________________________________________     Company
Siemens technical contact                __________________________________________________________     Siemens
Siemens return-to contact                __________________________________________________________     Siemens

SHIP-TO ADDRESS
Company name                             __________________________________________________________     Siemens
Address, City, State, Zip                __________________________________________________________     Siemens
Special instructions                     __________________________________________________________     Siemens

BILL-TO ADDRESS
Company name                             __________________________________________________________     Company
Address, City, State, Zip                __________________________________________________________     Company
Billing contact                          __________________________________________________________     Company
                                         __________________________________________________________     Company

FINANCIAL INFORMATION
Warranty status                          __________________________________________________________     Company
Purchase order                           __________________________________________________________     Siemens
Repair charge                            __________________________________________________________     Company
Other charges                            __________________________________________________________     Company

RECEIVED PRODUCT INFO
(From customer to ASC)
Quantity                                 __________________________________________________________     Siemens
Model number                             __________________________________________________________     Siemens
CLEl codes                               __________________________________________________________     Siemens
Part number                              __________________________________________________________     Siemens
Serial number                            __________________________________________________________     Siemens
Hardware revision                        __________________________________________________________     Siemens
Software revision                        __________________________________________________________     Siemens
Contained sub-assemblies                 __________________________________________________________     Siemens
Hardware configuration                   __________________________________________________________     Siemens
Software configuration                   __________________________________________________________     Siemens

SHIPPED PRODUCT INFO
(From ASC to customer)
Quantity                                 __________________________________________________________     Company
Model number                             __________________________________________________________     Company
CLEl code                                __________________________________________________________     Company
Part number                              __________________________________________________________     Company
Serial number                            __________________________________________________________     Company
Hardware revision                        __________________________________________________________     Company
Software revision                        __________________________________________________________     Company
Contained sub-assemblies                 __________________________________________________________     Company
Hardware configuration                   __________________________________________________________     Company
</TABLE>

                                       29

<PAGE>   30

CUSTOMER SERVICE RMA FORM

<TABLE>
<S>                                                                                                   <C>
                                                                                                          Who
RMA NUMBER                               __________________________________________________________     Company

SHIPPING INFORMATION
Shipping carrier                         __________________________________________________________     Company
Carrier service                          __________________________________________________________     Company
Billing account                          __________________________________________________________     Company
Freight charges                          __________________________________________________________     Company
Insurance Y/N                            __________________________________________________________     Company
Freight paid by                          __________________________________________________________     Company

ADVANCED REPLACEMENT
AR required (YIN)                        __________________________________________________________     Siemens
AR-RMA number                            __________________________________________________________     Company
Purchase order                           __________________________________________________________     Siemens
AR charge                                __________________________________________________________     Company

STATEMENT OF PROBLEM
Symptoms                                 __________________________________________________________     Siemens
Application                              __________________________________________________________     Siemens
Connections                              __________________________________________________________     Siemens

INSTRUCTIONS
Repair/replace                           __________________________________________________________     Siemens
Repair/replace billable?                 __________________________________________________________     Company
H/W upgrade required                     __________________________________________________________     Siemens
S/W upgrade required                     __________________________________________________________     Siemens
Upgrades billable?                       __________________________________________________________     Company

DIAGNOSIS
What was found to be wrong               __________________________________________________________     Company

REPAIR ACTION
Repaired or replaced                     __________________________________________________________     Company
Tests completed                          __________________________________________________________     Company
H/W upgraded to revision                 __________________________________________________________     Company
S/W upgraded to revision                 __________________________________________________________     Company
Configurations restored                  __________________________________________________________     Company
                                         __________________________________________________________     Company

COMMENTS
Siemens / ASC                            __________________________________________________________     Both

ADVANCED SWITCHING COMMUNICATIONS

CURRENT LOCATION
Receiving                                __________________________________________________________     Company
Repair WIP                               __________________________________________________________     Company
Shipping                                 __________________________________________________________     Company

REPAIR DEPARTMENT
Repaired by                              __________________________________________________________     Company
Upgraded by                              __________________________________________________________     Company
Tested by                                __________________________________________________________     Company
</TABLE>

14. SCHEDULE I TRAINING EQUIPMENT

                                       30

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