Document:

<PAGE>

                                                                    Exhibit 10.5

                               LICENSE AGREEMENT

         This License Agreement ("Agreement"), is entered into as of May 13,
2002 ("Effective Date") between Oasys Telecom, Inc., a California corporation
with offices at 7060 Koll Center Parkway, Suite 340, Pleasanton, CA 94566
("Oasys"), and Larscom Incorporated, a Delaware corporation with offices at 1845
McCandless Drive, Milpitas, CA 95035 ("Larscom").

         WHEREAS:

         A. Oasys and Larscom are parties to the OEM Agreement (as defined
below) pursuant to which Oasys is obligated to manufacture for and supply to
Larscom the Products (also defined below);

         B. Larscom has expressed to Oasys its concerns regarding the continued
performance by Oasys of the OEM Agreement and requested Oasys to provide
assurances as to Oasys' continued performance. Among other reasons and to
address these concerns, Oasys has requested that Larscom agree to a
restructuring of the manufacture and supply arrangements between Oasys and
Larscom;

         C. Larscom has agreed to terminate the OEM Agreement, subject to the
execution of this Agreement and the granting thereby to Larscom of a
non-executory license with respect to certain Oasys technology, so as to
mitigate the losses which Larscom may suffer through the loss of the benefit of
its investment in the Products and the essential benefit of the bargain
negotiated by Larscom with respect to the OEM Agreement, including through the
continued design, development, manufacture, sale, use, support, improvement,
modifications and other exploitation and commercialization of the Products;

         D. As further consideration for the entry of this Agreement, and among
other consideration provided to Oasys, Larscom has agreed, at the request of
Oasys, to enter into that certain Supply Agreement relating to the purchase of
certain Products from Oasys (as amended, restated or otherwise modified from
time to time, the "Supply Agreement");

         NOW, THEREFORE, in consideration of the foregoing premises and the
mutual covenants and agreements contained herein, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereby agree as follows:

1.       DEFINITIONS

         1.1 "Customer Documentation" shall mean any user manuals, QuickStart
Guides, release notes and application notes relating to the Products.

         1.2 "Customer" shall mean a person or business enterprise which
acquires Larscom Equipment, from Larscom or from its distributors, resellers, or
others in Larscom's distribution channels, for its ordinary purposes or use in
its normal operations.

          1.3 "Larscom Equipment" shall mean the telecommunications equipment
manufactured, marketed and/or distributed by Larscom and may include the
Products.

         1.4 "Products" shall mean only the products listed on Exhibit A and all
related Customer Documentation.

         1.5 "OEM Agreement" shall mean the Non-Exclusive OEM Agreement executed
by Oasys and Larscom as of May 1, 2001, as amended by Amendment No. 1 to the
Non-Exclusive OEM Agreement entered into on September 7, 2001 (the "Amendment").

         1.6 "Proprietary Rights" shall mean all patent rights, copyrights, mask
work rights, trade secret rights, sui generis database rights, and all other
intellectual and industrial property rights of any kind anywhere in the
universe,

<PAGE>

together with all applications for any of the foregoing or any rights to renew,
extend or otherwise improve the foregoing.

         1.7 "Software" shall mean the software and firmware developed and owned
or licensed from third parties by Oasys and included in the Products or used in
the design, development, manufacture, testing, use or support of the Products,
and includes, without limitation, software used in or with FPGAs and any other
digital logic devices.

         1.8 "Testing Equipment" shall have the meaning set forth in Section 7.3
below.

         1.9 "Technical Information" shall include all mechanical drawings,
assembly drawings, silk screen art work, layouts, Gerber plots, bills of
materials, supplier lists, specifications, schematics, designs, processes,
protocols, know-how, tool and equipment descriptions, inspection, manufacturing,
test and quality control procedures specific to the Products, tooling designs
and fixture designs, Oasys history files related to Product defects and fixes
and other technical information pertinent to the design, development,
manufacture, testing and support of the Products and the development and use of
the Testing Equipment.

         1.10 "Technology Deliverables" shall include all documents, software,
information and materials which permit Larscom to exercise fully the rights
granted under this Agreement, including, without limitation, the Technical
Information, source code and object code for the Software developed and owned by
Oasys together with associated documentation and the Customer Documentation. A
list of the Technology Deliverables is attached to this Agreement as Exhibit B.

2.       LICENSE GRANT

         2.1 License Grant. Oasys hereby unconditionally grants to Larscom a
royalty-free, fully paid-up, non-exclusive, perpetual, irrevocable,
non-terminable (except as provided in Section 2.3 below), worldwide license,
under all of Oasys' Proprietary Rights in and to the Technical Information, the
Software, the Customer Documentation and the Technology Deliverables (the
"License"), to:

make, have made, use, sell, sell for use, offer for sale, import, distribute,
support and otherwise commercialize the Products and modifications thereof made
by or for Larscom;

copy, reproduce, distribute and support the Software (as object code only) and
Customer Documentation and modifications of the foregoing made by or for
Larscom, in connection with the commercialization of the Products;

debug, customize, update, enhance, make improvements to and otherwise modify the
Products, the Software, and the Customer Documentation; and

use, copy, reproduce, create derivative works of and modify the Technical
Information, the Technology Deliverables, the Software and the Customer
Documentation in connection with any of the foregoing.

         2.2 Sublicenses. The rights granted under the License may not be
sublicensed by Larscom except that, subject to the terms in Section 2.1, Larscom
may grant appropriate sublicenses: (a) to its Customers in connection with their
use of the Products, including the Software therein and Customer Documentation
therefor; (b) to third party resellers, distributors and others in Larscom's
channels of distribution; and (c) to Larscom's consultants, independent
contractors and third party manufacturers engaged by Larscom to provide
consulting design, manufacturing and testing services solely and exclusively in
connection with such party's provision of such services.

         2.3 Exceptions to Non-Terminability. The License shall terminate if
during the one (1) year period immediately following the Effective Date,
Larscom:

                  (a) files for or converts to a case for relief under Chapter 7
of the United States Bankruptcy Code("Bankruptcy Code") in which Larscom is the
debtor; or

                  (b) is dissolved.

<PAGE>

Nothing in this Section 2.3 shall affect or result in the termination of any
rights of Larscom hereunder which are transferred or licensed to any third party
except as an integral part of the liquidation action described in (a) and (b)
and, for the avoidance of doubt, nothing in this Section 2.3 shall affect any
transfer or license otherwise permitted by the terms of this Agreement. Further,
one (1) year after the Effective Date, this Section 2.3 shall cease to have any
further force or effect, and thereafter, the License shall be deemed to be
non-terminable.

         2.4 Larscom's Rights under Bankruptcy. Larscom's rights under this
Agreement are perpetual, irrevocable, and non-executory, notwithstanding any
other provision of this Agreement or any other contract, to the maximum extent
permitted by applicable law. In the event of the commencement of a bankruptcy
proceeding by or against Oasys under the Bankruptcy Code, the License grant to
Larscom in Section 2.1 shall continue in full force and effect. Under no
circumstances shall Larscom's exercise of the rights granted to it in Section
2.1 ever be construed as an infringement of Oasys' Proprietary Rights. In the
event that a bankruptcy court or other court of competent jurisdiction ever
determines by final judgment that this Agreement is executory, despite every
intention and effort by the parties to negotiate and document non-executory
rights for Larscom, and without implying any acceptance of the rejected concept
that it is legally impossible to create such a non-executory license for
Proprietary Rights, all rights and licenses granted under or pursuant to this
Agreement are, and shall otherwise be deemed to be, for purposes of Section
365(n) of the Bankruptcy Code, licenses of rights to "intellectual property" as
defined under Section 101 of the Bankruptcy Code; the Technical Information, the
Software, the Customer Documentation and the Technology Deliverables are
"embodiments" of such intellectual property; and the Supply Agreement is an
agreement "supplemental to" this Agreement. Furthermore, in such an event, the
parties agree that Larscom, as a licensee of such rights under this Agreement,
shall retain and may fully exercise all of its rights and elections under the
Bankruptcy Code and other applicable law, including any right by Larscom to
specific performance of this Agreement, since Oasys acknowledges and agrees that
the Technical Information, the Technology Deliverables, the Software and the
Customer Documentation are unique and that rejection of the License will cause
Larscom irreparable harm for which its legal remedies are inadequate; provided,
however, that nothing herein shall be deemed to constitute a present exercise of
such rights and elections.

         2.5 Enforcement and Maintenance of Proprietary Rights. If any
infringement or threatened infringement of Oasys' Proprietary Rights licensed
hereunder comes to the notice of Larscom, Larscom will notify Oasys of same.
Upon such notification, Oasys may, but shall not be obligated to, take such
steps as it considers appropriate, at its sole expense, provided that if Oasys
fails for any reason to take actions or commence proceedings to restrain the
infringement within thirty (30) days of notification by Larscom, Larscom will be
entitled to take such actions or commence such proceedings. Larscom will be
entitled in any such action or proceeding to take all necessary or desirable
steps in the name of Oasys and Oasys will cooperate and assist Larscom in taking
such steps. Without limiting the foregoing, if necessary or desirable to do so,
Larscom may file, prosecute and maintain such applications, registrations and
other filings and recordation in respect of Oasys' Proprietary Rights licensed
hereunder, in the name of Oasys.

3.       DELIVERY OF TECHNOLOGY DELIVERABLES.

         3.1 Deliverables. Immediately following execution of this Agreement
Oasys will deliver to Larscom a significant portion of the Technology
Deliverables and Oasys will complete its delivery of the Technology Deliverables
by not later than fifteen (15) business days after the Effective Date. The
Technology Deliverables, which the parties have listed in the attached Exhibit
B, will include, without limitation: (i) a copy of the Software developed and
owned by Oasys (as described in Exhibit B) in both source code and object code
formats; and (ii) a complete copy of the Technical Information in formats
compatible with Oasys' own design tools (for example, Microsoft Office, PCAD,
AutoCad, etc.) to the extent applicable. Oasys will not be required to reformat
or convert any of the Technology Deliverables into any particular format
requested by Larscom.

         3.2 Modification. To the extent necessary, the Technology Deliverables
delivered by Oasys to Larscom may be modified by Oasys, at Oasys' sole cost and
expense, to remove or alter occurrences of Oasys' trademarks, trade names,
product names and product numbers which are unique to and serve to identify
Oasys' products; provided however, that no such removal or alteration shall
affect the ability of Larscom to use the Technology Deliverables as contemplated
in the License and otherwise under this Agreement.

<PAGE>
4.       OWNERSHIP.

         Oasys acknowledges and agrees that Larscom shall own all right, title
and interest, including all Proprietary Rights, in and to any customizations,
updates, enhancements or improvements to, or derivative works or other
modifications of, the Technical Information, the Software, the Customer
Documentation and the Technology Deliverables, created, developed or made by or
for Larscom. Larscom acknowledges and agrees that, except for the License and
other rights granted hereunder or pursuant to that certain letter agreement
between the parties dated April 9, 2002, Oasys shall continue to own all right,
title and interest, including the underlying Proprietary Rights as they
currently exist, in and to the Technical Information, the Software, the Customer
Documentation and the Technology Deliverables and any and all modifications,
improvements and/or derivative works thereof or thereto made by or for Oasys.

5.       NON-EXECUTORY AGREEMENT.

         5.1 License Fees. Oasys acknowledges and agrees that there are no
license fees, royalties or other amounts payable by Larscom in respect of the
License or the rights granted pursuant to this Agreement.

         5.2 Full Performance. The parties acknowledge and agree that upon
Larscom entering into this Agreement and the Supply Agreement, Larscom will have
fully paid for all consideration payable with respect to the grant of the
License and performed all of its obligations under this Agreement, and Larscom
has no further performance obligations under this Agreement, or any other
agreement, that must be satisfied in order to have fully performed its
obligations under this Agreement. There are no other conditions to the
effectiveness of this Agreement. Specifically, none of Larscom's performance
obligations under the Supply Agreement are relevant to the interpretation of the
non-executory nature of this Agreement, since the intent of the parties is that
this Agreement function as a non-executory transfer of rights.

6.       INTENTIONALLY LEFT BLANK.

7.       REPRESENTATIONS AND WARRANTIES; DISCLAIMER.

         7.1 General Representations and Warranties. Each party hereby
represents and warrants to the other party as follows:

                  (a) Corporate Existence, Power and Authorization. Such party:
(i) is a corporation duly organized, validly existing and in good standing under
the laws of the state in which it is incorporated; (ii) has the corporate power
and authority and the legal right to enter into this Agreement and to perform
its obligations hereunder; and (iii) has taken all necessary corporate action on
its part to authorize the execution and delivery of this Agreement and the
performance of its obligations hereunder.

                  (b) Enforcement of Obligations. This Agreement has been duly
executed and delivered on behalf of such party, and constitutes a legal, valid
and binding obligation, enforceable against such party in accordance with its
terms.

                  (c ) No Consents. All necessary consents, approvals and
authorizations of all governmental authorities and other persons required to be
obtained by such party in connection with this Agreement have been obtained.

                  (d) No Conflict. The execution and delivery of this Agreement
and the performance of such party's obligations hereunder: (i) do not conflict
with or violate any requirement of applicable laws or regulations and (ii) do
not conflict with, or constitute a default under, any contractual obligation of
it.

                  (e) Not in Bankruptcy. Neither party has made, nor has any
current intention of making, an assignment to or for the benefit of its
creditors, nor is aware of any petition or proceeding in bankruptcy having been
filed or threatened against it, nor does it have intention of filing any such
petition.

<PAGE>

         7.2 Intellectual Property. Oasys represents and warrants to Larscom
that: (i) except as listed on Exhibit B, Oasys is the sole and exclusive owner
of all right, title and interest, including all Proprietary Rights, in and to
the Technical Information, the Software, the Customer Documentation and the
Technology Deliverables; (ii) Oasys has not granted to any third party any
license or other interest in the Technical Information, the Software, the
Customer Documentation or the Technology Deliverables which would prevent,
impair or impede Larscom's exercise of the License or other rights granted to
Larscom under this Agreement; (iii) no Proprietary Right of any third party
would be infringed by Larscom's exercise of the License and the other rights
granted to Larscom under this Agreement; (iv) Oasys has not misappropriated or
infringed the Proprietary Rights of any third party in granting to Larscom the
License or other rights under this Agreement; provided that Larscom's sole and
exclusive remedy on a breach of this representation is set forth in Section 7.5
below; (v) Oasys is not aware of any infringement or misappropriation by a third
party of the Technical Information, the Software, the Customer Documentation or
the Technology Deliverables; and (vi) all Proprietary Rights in the Technical
Information, the Software, the Customer Documentation and the Technology
Deliverables are subsisting and have not been adjudged invalid or unenforceable,
in whole or in part; and (vii) the Technical Information, the Software, the
Customer Documentation and the Technology Deliverables are free and clear of any
liens, encumbrances or security interests.

         7.3 Technology Deliverables. Oasys further represents and warrants to
Larscom that: (a) the Technology Deliverables as delivered to Larscom hereunder
contain all technology, software, know-how and other information to enable a
person of ordinary skill in the art to manufacture each of the Products; and (b)
each unit of Product when so manufactured (and in the absence of any defect in
materials or workmanship) would: (i) subject to the following subsection (ii),
conform materially to its specifications as set forth in Exhibit C; (ii) comply
with the following governmental and industry certification requirements as
applicable to each Product: UL/cUL, NEBS-3 (once such Product has been
certified), FCC and CE mark (once such Product has been certified)
certifications; and (iii) materially comply with all other applicable federal,
state and local laws and regulations. Notwithstanding the foregoing, Oasys makes
no warranty (express, implied or statutory) with respect to a Product, nor will
Oasys be held liable to Larscom for breach of warranty for any claim made
against such Product, to the extent that such claim arises out of (i) a defect
in Larscom's manufacture of that Product, including any defect in materials or
workmanship, (ii) any modification to Oasys' specifications therefor by or on
behalf of Larscom, or (iii) the use of such Product in a manner contrary to the
published documentation for that Product. Notwithstanding the foregoing, the
Product identified as Orion 5001 Shelf & Backplane (part no. 815-00074-002) will
comply with the UL/cUL and NEBS-3 certification requirements once the
certification process for such Product has been completed.

         7.4 Testing Equipment. Oasys further represents and warrants to Larscom
that the Technology Deliverables contain all technology, software, know-how and
other information required for Larscom to precisely duplicate Oasys' testing
equipment for the Products (the "Testing Equipment") and testing specifications
and protocols. Subject to the foregoing, Oasys shall not be required to transfer
any of its own Testing Equipment to Larscom under this Agreement.

         7.5 Indemnity. Oasys shall defend, indemnify and hold Larscom, its
affiliates and Customers, and each of their respective directors, officers,
employees, agents and representatives harmless from any and all claims, actions,
damages or other liabilities, including reasonable attorney's fees, arising from
any breach of any representation or warranty of Oasys in this Agreement,
including any claim that any Product, any portion thereof or any related
Proprietary Rights therein or the exercise of such rights, constitutes an
infringement or unauthorized use of any third party Proprietary Rights (each, an
"Infringement Action"). Larscom shall at all times have the right to instruct
its own counsel and defend and settle any Infringement Action where Oasys fails
to take reasonable and timely steps to defend such action. Notwithstanding the
foregoing, Oasys shall have no obligation to indemnify Larscom against any
Infringement Action arising out of (i) the Larscom Equipment, (ii) the
combination of the Larscom Equipment and any Product or (iii) any modification
of the Products by Larscom, its affiliates or Customers.

8.       MISCELLANEOUS.

         8.1 Entire Agreement. This Agreement (and all Exhibits hereto)
supersede all other prior negotiations, representations, understandings and
agreements between or among the parties relating to the subject matter of this

<PAGE>

Agreement, except for that certain letter agreement between the parties dated
April 9, 2002 which shall continue in full effect in accordance with its terms.

         8.2 Amendment. No agreements amending, modifying or supplementing the
terms hereof shall be effective except by means of a written document signed by
the duly authorized representatives of both parties.

         8.3 Successors and Assigns. This Agreement shall be binding upon and
inure to the benefit of Oasys, Larscom and their respective successors and
permitted assigns. Larscom will not enter into any transaction for the purpose
of selling its license rights hereunder to any third party without any other
legitimate business purpose. Notwithstanding the foregoing, either party may at
any time assign or otherwise transfer to any other person or entity all or part
of its rights or obligations under this Agreement in connection with an
acquisition of all or substantially all of its assets or business relating to
the Products or this Agreement or an acquisition of a controlling interest in
its equity securities or in connection with a merger, consolidation,
reorganization or other like transaction. Except as provided herein, neither
party may assign or transfer any of its rights or obligations under this
Agreement without the prior written consent of the other party, which consent
shall not be unreasonably withheld (and any purported assignment without such
consent shall be void).

         8.4 Notices. All notices, consents or approvals required by this
Agreement shall be in writing and shall be deemed given five (5) days after
being sent by certified or registered mail, postage prepaid, or when received
after being sent by facsimile (confirmed by such certified or registered mail)
or by commercial overnight courier service with tracking capabilities, to the
parties at the addresses provided below or such other addresses as may be
designated in writing by the respective parties pursuant to the terms of this
notice provision:

          Initial Addresses for Notice:
          Oasys Telecom, Inc.                      Larscom Incorporated
          7060 Koll Center Parkway, Suite 340      1845 McCandless Drive
          Pleasanton, CA 94566                     Milpitas, CA 95035
          Attn: Mr. Gerard Miille, CEO             Attn: Chief Executive Officer

         8.5 Governing Law and Legal Actions. This Agreement shall be governed
by and construed in accordance with California law as applied to transactions
taking place in California between California residents. All disputes between
the parties arising out of or relating to this Agreement (other than actions
seeking only equitable remedies) shall be settled by binding arbitration
pursuant to the Commercial Arbitration Rules of the American Arbitration
Association by an arbitrator who is knowledgeable about telecommunications
equipment. The arbitrator may award any legal or equitable remedy and may, in
his discretion, require one party to pay the costs of the arbitration as well as
the fees and expenses, including reasonable attorneys' fees, of the other party.
In the absence of any such ruling, each party shall bear its own costs in
connection with an arbitration proceeding hereunder and the parties shall share
the costs of the arbitration equally.

         8.6 Waiver. The failure of Oasys or Larscom to enforce a right or
remedy under this Agreement shall not act as a waiver of that right or remedy or
the ability to assert that right or remedy relative to the particular situation
involved. The waiver by either party of a breach of any provisions contained in
this Agreement shall be effective only if set forth in a writing signed by both
parties and shall in no way be construed as a waiver of any succeeding breach of
such provision or the waiver of the provision itself.

         8.7 Headings. Headings included herein are for convenience only and
shall not be used to interpret or construe this Agreement.

         8.8 Severability. If any provision of this Agreement shall be held
void, invalid, illegal or unenforceable, that provision shall be limited or
eliminated to the minimum extent necessary so that this Agreement shall
otherwise remain in full force and effect and fully enforceable.

         8.9 Construction of Agreement. This Agreement is the product of
extensive negotiations between the parties hereto and no party shall be deemed
the drafter of this Agreement. No portion of this Agreement shall be construed
against any party as drafter.

<PAGE>

         8.10 No Joint Venture. Nothing contained in this Agreement shall be
deemed or construed as creating a joint venture or partnership between the
parties. Except as expressly set forth, no party is by virtue of this Agreement
authorized as an agent, employee or legal representative of any other party, and
the relationship of the parties is, and at all times shall continue to be, that
of independent contractors.

         8.11 Counterparts. This Agreement may be executed in counterparts, each
of which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

<PAGE>

         IN WITNESS WHEREOF, the parties have executed this Agreement to be
effective as of the Effective Date.

Larscom Incorporated                         Oasys Telecom, Inc.

By:/s/ Daniel L. Scharre                     By: /s/ Gerard Miille
   ----------------------                        -------------------

Name: Daniel L. Scharre                      Name: Gerard Miille
     ------------------                            --------------

Title: President and Chief                   Title: President and Chief
         Executive Officer                            Executive Officer
         -----------------                            -----------------

<PAGE>

                                    EXHIBIT A

                                    PRODUCTS
 ---------------- --------------------------------------------------------------
 Part Number      Item
 ---------------- --------------------------------------------------------------
 815-00063-001    Orion 5000 23" Shelf & Backplane
 ---------------- --------------------------------------------------------------
 815-00073-002    Orion 5000 19" Shelf & Backplane
 ---------------- --------------------------------------------------------------
 810-00062-010    MPU Module with Ethernet Aux Board, -48V
 ---------------- --------------------------------------------------------------
 810-00068-012    Programmable M13 Module, T1, -48V, "+" Version
 ---------------- --------------------------------------------------------------
 810-00068-003    Programmable M13 Module, E1, -48V
 ---------------- --------------------------------------------------------------
 810-00068-009    T3-Only M13 Module, -48V
 ---------------- --------------------------------------------------------------
 810-00067-002    OMX-3 Module, -48V
 ---------------- --------------------------------------------------------------
 810-00066-001    M13 IN Rim
 ---------------- --------------------------------------------------------------
 810-00065-001    M13 OUT Rim
 ---------------- --------------------------------------------------------------
 810-00069-002    OMX3 IN Rim
 ---------------- --------------------------------------------------------------
 810-00069-001    OMX3 OUT Rim
 ---------------- --------------------------------------------------------------
 815-00050-009    Module Blank
 ---------------- --------------------------------------------------------------
 835-00081-002    RIM Blank
 ---------------- --------------------------------------------------------------

 ---------------- --------------------------------------------------------------
 815-00077-002    Orion 5003 Shelf & Backplane, 1 MPU w/Aux, 2 OMX-3's
 ---------------- --------------------------------------------------------------
 815-00074-002    Orion 5001 Shelf & Backplane, 1 MPU w/Aux, 2 T3-Only M13's
 ---------------- --------------------------------------------------------------
 810-00062-009    MPU Module with Ethernet Aux Board, -48 V, no faceplate
 ---------------- --------------------------------------------------------------
 810-00067-003    OMX-3 Module, -48V, no faceplate
 ---------------- --------------------------------------------------------------
 810-00068-006    T3-Only M13 Module, T1, -48V, no faceplate
 ---------------- --------------------------------------------------------------

 ---------------- --------------------------------------------------------------
 815-00011-xxx    Cable, UID, Various lengths
 ---------------- --------------------------------------------------------------
 815-00055-xxx    Cable, Null Modem, Various lengths
 ---------------- --------------------------------------------------------------
 815-00064-xxx    Cable, RIM to Champ Plug, Various lengths
 ---------------- --------------------------------------------------------------
 815-00065-xxx    Cable, Champ Receptacle to Champ Receptacle, Various Lengths
 ---------------- --------------------------------------------------------------
 815-00066-xxx    Cable, Champ Receptacle to Wirewrap, Various Lengths
 ---------------- --------------------------------------------------------------
 815-00069-xxx    Cable, Champ Receptacle to Champ Plug, Various Lengths
 ---------------- --------------------------------------------------------------
 815-00082-001    Cable, OMX3 Rim to M13 Rim, 14"
 ---------------- --------------------------------------------------------------
 815-00082-002    Cable, OMX3 Rim to M13 Rim, 24"
 ---------------- --------------------------------------------------------------
 815-00033-xxx    Cable, DS3 Coax, Straight BNC's, Various Lengths
 ---------------- --------------------------------------------------------------
 815-00053-xxx    Cable, DS3 Coax, Straight/Right Angle BNC's, Various Lengths
 ---------------- --------------------------------------------------------------
 131-00004-001    Adapter, Right Angle, BNC, Male-to-Female
 ---------------- --------------------------------------------------------------

 ---------------- --------------------------------------------------------------
 890-00009-002    Version 4.1 Basic Software including terminal, telnet, SNMP,
                    & Web Server
 ---------------- --------------------------------------------------------------
 ---              Operations Manuals, Various
 ---------------- --------------------------------------------------------------

 ---------------- --------------------------------------------------------------

<PAGE>

                                    EXHIBIT B

                             TECHNOLOGY DELIVERABLES

                            I. Technical Information

1.   All Product Documentation included in the Escrow on January 23, 2002.

2.   All updates and current documentation as available on the date of this
     Agreement for the items in Escrow that were updated since the January 23,
     2002 date.

3.   Complete Documentation created by Oasys for each of the products listed in
     Exhibit A that are not included in escrow

         a. 815-00074-002 - Orion 5001, Shelf and Backplane, 1MPU w/Aux, 2 T3
            only M13's
         b. 810-00068-006 - T3-only M13 Module, T1, -48V, no faceplate
         c. 815-00033-xxx - Cable, DS3 Coax, Straight BNC's, Various Lengths
         d. 815-00053-xxx - Cable, DS3 Coax, Straight/Right Angle BNC's, Various
            Lengths
         e. 131-00004-001 - Adapter, Right Angle, BNC, Male to Female

4.   To the extent not included in items 1 through 3 above, all mechanical
     drawings, assembly drawings, silk screen art work, layouts, Gerber plots,
     bills of materials with AVL, specifications, schematics, designs,
     processes, protocols, know-how, tool and equipment descriptions,
     inspection, manufacturing test and quality control procedures specific to
     the Products, tooling designs and fixture designs, Oasys history files
     related to Product defects and fixes and other technical information
     pertinent to the design, development, manufacture, testing and support of
     the products listed in Exhibit A.

5.   All product development documentation associated with the requirements,
     design, and qualification of the products listed in Exhibit A. This would
     include but not be limited to such items as Functional Specifications,
     Design Specifications, relevant engineering design notes, Qualification
     Test Plans, and Qualification Test Results. Oasys will have no obligation
     to provide Product Requirements Documents hereunder.

6.   An itemized list of the CAD tools and versions used in the design and
     development of the products in Exhibit A. The would include Schematic
     Capture, PCB layout, Mechanical Design, and other tools utilized in the
     creation, viewing, and modifying documentation for the design, development
     and fabrication of the products in Exhibit A.

7.   All test plans, procedures, reports, and other documentation required to
     replicate Oasys' engineering validation test, manufacturing test, and
     repair functions. All equipment lists, descriptions, designs, drawings
     associated with replicating test and manufacturing equipment and fixtures.

<PAGE>

II.  Software

1.   Source code and all of the files associated with the software and FPGA for
     Release 4.1. This includes SNMP MIBs (private and public) associated with
     the current release.

2.   All object files that are required to operate the products in Exhibit A.
     This includes the file images for the boot proms, flash devices, FPGA, PLD,
     and other devices requiring programmed images.

3.   All software used by Oasys or its consultants, suppliers, vendors, contract
     manufacturers or other third party contractors for designing, developing,
     manufacturing, verification and testing the products in Exhibit A. For
     software packages purchased, a list by vendor and version of the software
     used and licensed for the purpose of developing, manufacturing,
     verification and testing will be supplied. For software developed by Oasys
     for the purpose of assisting with the design, developing, manufacturing,
     verification and testing, all the source code and object files will be
     supplied as part of this Agreement.

The software listed below has been licensed to Oasys by third parties. Larscom
acknowledges and agrees that it must obtain its own licenses to the following
Software:

4.   Third party Software used and licensed for the design and development of
     Product:

          o    Xilinx 4.1i Foundation Development System. Used for FPGA design.
          o    Viewlogic Viewdraw with Xilinx translators. Used for FPGA
               schematic capture.
          o    EST (Now Windriver) CLKVPA-C32-XM Vision CLICK Source debugger
               with probe for 683xx. Used for loading Boot Code into the MPU
               Module.
          o    AutoCad Lite V97 or later. Used for mechanical design.
          o    PCAD 2001 with integrated autorouter by Altium. Used for PC Board
               design of all modules except MPU Module.
          o    PCAD V8.5. Used for PC Board design of MPU Module.
          o    Spectra Router Ver. 10. Used for autorouting of complex PC
               Boards.
          o    Camtastic 2000. Gerber viewer for PC Boards.
          o    Greenhills Software, Inc. "Multi" Environment cross C/C++
               Compiler, Assembler, Linker for 68K target with ThreadX RTOS
               support. Need this environment to use our Make Files

5.   Third Party Software that is integrated into the Product:

          o    Express Logic ThreadX RTOS for 68K processors. Version G3.0F.3.0F
               for 68360. Real Time Operating System for MPU Module.
          o    Treck, Inc. (Now Elmic Systems) Ver. 2.2 Base TCP-IP Source
               Code(#TUTCPSRC), Telnet Source Code (#TUTELSRC), and Emanate/Lite
               SNMP Agent Source Code (#TUAGNSRC). Networking software
               integrated into MPU code.

<PAGE>

III. Customer Documentation

Customer Documentation for version 4.1 of the Products includes:

1.   Operations Manual for Exchange Mux II (Orion 5000) supporting release 4.1

2.   Quick Start Guide for Exchange Mux II (Orion 5000) supporting release 4.1

3.   Operations Manual for Mini Mux 155 (Orion 5003) supporting release 4.1

4.   Quick Start Guide for Mini Mux 155 (Orion 5003) supporting release 4.1

5.   Operations Manual for Mini Mux 280 (Orion 5001) supporting release 4.1

6.   Quick Start Guide for Mini Mux 280 (Orion 5001) supporting release 4.1

<PAGE>

                                    EXHIBIT C

                                 Specifications

Please see attached Oasys product specification sheets for:

1.   Mini-Mux 155 (OC-3/STM-1)

2.   Mini-Mux 280 M13 Multiplexer

3.   Exchange Mux II Advanced Multiplexer

                        [To be attached prior to signing]<PAGE>
                                                                    Exhibit 10.6

                                SUPPLY AGREEMENT

        This Supply Agreement ("Agreement"), is entered into on May 13, 2002
("Effective Date") between Oasys Telecom, Inc., a California corporation with
offices at 7060 Koll Center Parkway, Suite 340, Pleasanton, CA 94566 ("Oasys"),
and Larscom Incorporated, a Delaware corporation with offices at 1845 McCandless
Drive, Milpitas, CA 95035 ("Larscom").

        WHEREAS:

        A. Oasys and Larscom are parties to the OEM Agreement (as defined
below) pursuant to which Oasys is obligated to manufacture for and supply to
Larscom the Products (also defined below);

        B. Larscom is the holder of certain Warrants to purchase equity
securities of Oasys issued pursuant to that certain Note and Warrant Purchase
Agreement between Larscom and Oasys dated September 7, 2001 ("Note and Warrant
Purchase Agreement");

        C. Larscom has expressed to Oasys its concerns regarding the continued
performance by Oasys of the OEM Agreement and requested Oasys to provide
assurances as to Oasys' continued performance. Among other reasons and to
address these concerns, Oasys has requested that Larscom agree to a
restructuring of the manufacture and supply arrangements between Oasys and
Larscom;

        D. Larscom and Oasys have therefore agreed to terminate the OEM
Agreement subject to: (i) the execution of that certain License Agreement dated
as of May 13, 2002 between Oasys and Larscom providing for the grant to Larscom
of a license to certain Oasys technology to permit Larscom to carry on its
business relating to the design, development, manufacture, distribution and
support of the Products (as amended, restated or otherwise modified from time to
time, the "License Agreement"); and (ii) the execution of this Agreement
providing for the placement of a final order for Products, certain prepayments
and support services;

        E. Larscom has further agreed, at the request of Oasys and subject to
the terms hereof, to surrender the Warrants.

        NOW, THEREFORE, in consideration of the foregoing premises and the
mutual covenants and agreements contained herein, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereby agree as follows:

        1. Certain Definitions.

        Capitalized terms used in this Agreement and not otherwise defined
herein shall have the meanings assigned to them in the License Agreement.

        1.1 "Final Order" shall have the meaning set forth in Section 2.1.

        1.2 "OEM Agreement" shall mean the Non-Exclusive OEM Agreement executed
by Oasys and Larscom as of May 1, 2001, as amended by Amendment No.1 to the
Non-Exclusive OEM Agreement entered into on September 7, 2001.

        1.3 "Purchase Order" shall mean a written or electronic purchase order
placed by Larscom to Oasys that specifies the name, part number, quantity and
delivery schedule of the Products (unless otherwise agreed by the parties).

        1.4 "Products" shall mean only the products listed on Exhibit A and all
related Customer Documentation.

        1.5 "Selected Larscom Customers" shall mean the entities set forth in
Exhibit D.

<PAGE>

         1.6 "Selected Oasys Customers" shall mean the entities set forth in
Exhibit D.

         1.7 "Selected Oasys Partners" shall mean the entities set forth in
Exhibit D.

         1.8 "Specifications" shall mean the operating requirements and
functionality of the Products as attached hereto as Exhibit B.

         2. SHIPMENT AND DELIVERY OF FINAL ORDERS

         2.1 Final Order. Subject to the terms and conditions of this Agreement
and the continued performance by Oasys in accordance with the terms hereof,
Larscom agrees to submit to Oasys two (2) Purchase Orders for the purchase of
Products, which Purchase Orders shall in the aggregate be not less than *****
($*****), exclusive of shipping and handling charges (the "Final Order"). The
Products purchased under the Final Order shall consist of approximately half
(1/2)-loaded equivalent systems.

         2.2 Order and Acceptance. Upon execution of this Agreement, Larscom
will submit the Purchase Orders for the purchase of Products to Oasys pursuant
to the Final Order. Such Purchase Orders shall have been reviewed by Oasys prior
to the Effective Date and be deemed accepted by Oasys upon its execution of this
Agreement.

         2.3 Delivery Dates. Unless otherwise agreed to by the parties, each
Purchase Order shall specify the date on which the Products must be received by
Larscom (the "Delivery Date"). Larscom may schedule regular intervals for
deliveries by setting forth the intervals in the Purchase Order. At Larscom's
sole expense, Larscom may utilize drop shipment options to any destination
specified by Larscom and agreed upon by Oasys. Notwithstanding the foregoing,
Oasys shall use all commercially reasonable efforts to deliver the Products
purchased under the Final Order not later than six (6) months after the
Effective Date. Oasys shall not be responsible for any delays in shipment or any
failure to ship to the extent resulting from Larscom's acts or omissions.

         2.4 Shipment Requirements and Risk of Loss. All shipments of Products
hereunder shall be F.O.B. Oasys' place of shipment. Title to Products ordered
hereunder shall pass from Oasys to Larscom upon Oasys' delivery to Larscom's
designated delivery location. Oasys shall immediately advise Larscom of any
prospective failure to timely ship the specified quantity of Products.

         2.5 Packaging. Oasys shall preserve, package, handle and pack all
Products so as to protect the Products from loss or damage, in conformance with
good commercial practice, government regulations and other applicable standards.
Static protection shall be provided for Products requiring such packaging.
Normal Products will be packaged in appropriate containers labeled with the
Larscom mark pursuant to Section 2.7 below. Each package label shall include the
following data: (i) quantity and (ii) assembly numbers of Products in package.

         2.6 Condition of Products. All Products shall be new except as
otherwise agreed in writing by the parties.

         2.7 Private Labeling. At Oasys' sole cost and expense, Oasys shall
manufacture the Products, including the Customer Documentation, ordered by
Larscom hereunder as Larscom private label versions, bearing the trademarks,
trade names and logos (the "Larscom Marks") and labeling and packaging specified
by Larscom and conforming to Larscom specifications for external appearance
(which shall not require any material change in form or dimensions of the
Products or require commercially unreasonable actions). Neither party is granted
any right or interest to the trademarks, marks or trade names of the other
party. However, Oasys may reproduce Larscom's Marks, as provided by Larscom, as
necessary to fulfill its obligations hereunder.

         2.8 Larscom-Specific Inventory and Tooling. Within sixty (60) days
after the Effective Date where practical, but otherwise after delivery to
Larscom of all Products pursuant to the Final Order, Larscom shall purchase from
Oasys, and Oasys shall sell to Larscom, (i) any and all Larscom-specific
inventory (such as labels bearing

Confidential treatment has been requested for portions of this exhibit. The copy
herewith omits the information subject to the confidentially request. Omissions
are designated as *****. A complete version of this exhibit has been filed
separately with the Securities and Exchange Commission.

<PAGE>

Larscom's name, logo or trademark but excluding silk screens, stencils and other
tooling) owned or controlled by Oasys as of the Effective Date (and not required
to fill the Final Order); and (ii) all Larscom-specific tooling owned or
controlled by Oasys, including without limitation, all silk screens, stencils
and the like that are only usable for Products produced for Larscom. For the
avoidance of doubt, Oasys shall have no obligation to sell to Larscom, and
Larscom shall have no right to purchase from Oasys, any tooling which is
currently Larscom-specific but can be adapted for other uses for other Oasys
customers. Oasys will diligently assist Larscom in purchasing all
Larscom-specific tooling which is not owned or controlled by Oasys but is,
rather, owned or controlled by Oasys' contract manufacturers.

         2.9 Purchase by Larscom. The combined purchase price for all
Larscom-specific inventory and tooling to be purchased by Larscom shall be
Oasys' net cost for same (excluding any and all indirect costs, cost of labor,
overhead expenses and the like) plus ***** (*****%), but where such price
calculated in accordance with the foregoing exceeds ***** ($*****), the purchase
price for Larscom's purchase of all such inventory and tooling shall be *****
($*****). Upon request, Oasys will furnish Larscom with copies of invoices,
receipts and other supporting documentation. The purchase of any
Larscom-specific inventory from Oasys will be pursuant to a separate purchase
order issued by Larscom.

         3. PRICES and PAYMENTS

         3.1 Prices. The prices payable by Larscom for Products purchased under
the Final Order are set forth in Exhibit C. Such prices shall apply only to the
Final Order.

         3.2 Prepayment. Subject to Section 2.2, upon execution of this
Agreement, Larscom will advance to Oasys the sum of ***** ($*****) which amount
shall be a prepayment in advance on account of the Final Order described in
Section 2.1 above (the "Prepayment"). Oasys hereby accepts the Prepayment,
subject to Section 3.4 below. The Prepayment shall first be applied to any
amounts due from Larscom pursuant hereto before any invoice shall be submitted
to, or be payable by, Larscom. In addition, except as otherwise agreed or
specified by Larscom in writing, no payment shall be due and no part of the
Prepayment may be applied toward an invoice, unless: (i) Oasys has delivered to
Larscom the Products to which such invoice relates; and (ii) Larscom has
accepted delivery of such Products, where "accepted" shall mean that Larscom has
conducted its inspection of an incoming shipment consistent with the manner in
which it conducted similar inspections when receiving shipments of Products
under the OEM Agreement. On the first business day after July 1, 2002, if any
part or all of the Prepayment has been duly applied to invoice(s) for Products
delivered to and accepted by Larscom pursuant to the Final Order, Larscom will
make a further one-time advance of such amount as may be needed to restore the
sum held by Oasys as the Prepayment to ***** ($*****). Such further advance
shall in no event exceed the sum of ***** ($*****).

         3.3 Payment Procedure. Except as otherwise provided in Section 3.2 and
subject to the continued performance of Oasys in accordance with the terms of
this Agreement, payment for Products shall be net thirty (30) days of delivery
to Larscom's place of business or other destination specified by Larscom.
Invoices outstanding forty-five (45) days after such delivery and acceptance by
Larscom shall be subject to a late charge equal to the lesser of one point five
percent (1.5%) per month or the maximum amount permitted by law. Shipping and
handling charges under this Agreement shall be consistent and comparable with
those amounts charged to Larscom for shipping and handling under the OEM
Agreement.

         3.4 Purchase Money Security Interest. As security for the payment and
performance of the obligations of Oasys pursuant to this Agreement (and any
purchase order, invoice or other document issued in connection herewith and in
each case whether now existing or hereafter arising, and whether due or to
become due, absolute or contingent, liquidated or unliquidated, determined or
undetermined) in an aggregate principal amount of up to

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

<PAGE>

$*****, Oasys hereby grants to Larscom a security interest in all of Oasys'
right, title and interest in, to and under the following personal property,
wherever located and whether now existing or owned or hereafter acquired or
arising: (i) the Prepayment (however evidenced and including, without
limitation, any accounts, investment property, instruments or chattel paper);
(ii) any and all goods (and any document issued in respect thereof) and general
intangibles, of whatever kind or nature (including, without limitation,
inventory, equipment spare parts, components, supplies, packing and other
materials, maintenance and servicing agreements, warranty claims, licenses and
any other contractual rights); (iii) all additions, substitutions, replacements,
attachments, accessories and accessions to and for the foregoing (including all
software upgrades), (iv) any and all lease, purchase, supply or other contracts
for, or with respect to, any of the foregoing; (v) any and all rights to any
payments due and payable from Larscom pursuant to this Agreement; and (vi) all
products and proceeds (including insurance proceeds) and supporting obligations
of any and all of the foregoing. Upon completion of Oasys' supply obligations
under the Final Order to the extent of the Prepayment, the foregoing security
interest shall terminate and be deemed to be released and discharged in full.

         3.5 UCC. The security interest granted under Section 3.4 is intended to
be, and the parties hereby agree that it shall be treated, to maximum extent
possible, as a purchase money security interest for the purposes of Article 9 of
the California Uniform Commercial Code (as amended from time to time, the
"UCC"). Terms not otherwise defined in this section shall, where applicable,
have the meaning ascribed to them in the UCC.

         3.6 Oasys' Cooperation. Oasys agrees to take all action which Larscom
deems reasonably necessary to perfect the security interest granted in Section
3.4 and authorizes and appoints Larscom as its attorney for the purposes of
executing and filing any financing statements (or amendments, assignments,
continuations or terminations thereof) in connection with this Agreement and the
security interests granted hereunder. Oasys ratifies and authorizes the filing
by Larscom of any financing statements filed prior to the date hereof.

         3.7 Enforcement Cost. Oasys agrees to pay or reimburse Larscom for any
expenses (including reasonable attorneys fees), costs or liabilities which may
be suffered or incurred by Larscom in enforcing or exercising any of its rights
or remedies in connection with the security interests granted under Section 3.4
(including, without limitation, costs of collection, repossession, foreclosure,
defense of Larscom's rights or interests hereunder or costs in any bankruptcy or
insolvency proceedings or work out of Oasys).

         4. REPRESENTATIONS AND WARRANTY; DISCLAIMERS

         4.1 Division of Warranty Obligations. Responsibility to honor
warranties for the Products shall be that of the party manufacturing the
Products. For the avoidance of doubt, Oasys shall continue to bear the
responsibility for all warranty-related obligations for Products manufactured
prior to the Effective Date (pursuant to the OEM Agreement) and Products
manufactured under this Agreement pursuant to the Final Order or any other
Purchase Order submitted by Larscom and accepted by Oasys. Larscom shall be
responsible for all warranty-related obligations for any Product manufactured
pursuant to the License granted in the License Agreement.

         4.2 Product Warranty. Subject to Section 4.1, Oasys warrants for a
period of sixty (60) months after shipment thereof that each Product
manufactured by Oasys and purchased by Larscom, including the associated
embedded software, shall: be manufactured, processed and assembled by Oasys or
by companies under Oasys' direction; subject to item (iii) below, conform
materially to its Specifications; comply with the following governmental and
industry certification requirements as applicable to each Product:

UL/cUL, NEBS-3 (once such Product has been certified), FCC and CE mark (where
applicable, once such Product has been certified) certifications, and materially
comply with all other applicable federal, state and local laws and regulations;
be free from material defects in material and workmanship; and be free and clear
of all liens, encumbrances, restrictions and other claims against title or
ownership.

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

<PAGE>

         4.3 Exceptions to Warranty Coverage. This warranty is contingent upon
proper use of the Products in the application for which they were intended as
indicated in the Customer Documentation, and Oasys makes no warranty (express,
implied or statutory) for Products that are modified or subjected to accident,
misuse, neglect, unauthorized repair or improper testing or storage.

         4.4 Intellectual Property Warranty. Oasys represents and warrants to
Larscom that it owns or has the licenses to exercise all rights, including
Proprietary Rights, in and to the technology embodied in or used to manufacture
the Products, including without limitation, the Software and the Customer
Documentation, free of any and all restrictions, liens, encumbrances,
settlements, judgments or adverse claims and, except as set forth on Exhibit B
of the License Agreement, as owner or licensor of such Proprietary Rights, it
has the full power and authority to grant Larscom the rights granted in this
Agreement. Larscom acknowledges and agrees that it must obtain its own licenses
to use the third-party Software identified on Exhibit B of the License
Agreement.

         5. SURRENDER OF WARRANTS.

         Upon execution of this Agreement, Larscom shall surrender to Oasys the
following warrants issued pursuant to the Note and Warrant Purchase Agreement
dated September 7, 2001 (each a "Warrant" and collectively, the "Warrants"):

             ------------------------- ----------------------
             Date                      Warrants
             ------------------------- ----------------------
               9/7/01                  *****
             ------------------------- ----------------------
              9/25/01                  *****
             ------------------------- ----------------------
             10/26/01                  *****
             ------------------------- ----------------------
             12/17/01                  *****
             ------------------------- ----------------------
             12/27/01                  *****
             ------------------------- ----------------------
             Total                     *****
             ------------------------- ----------------------

         6. TERMINATION OF OEM AND RELATED AGREEMENTS.

         The agreements specified below shall be terminated as follows:

                  (i) the OEM Agreement shall be terminated upon the execution
of this Agreement and shall thereafter be of no further force or effect,
however, all terms relating to warranty-related obligations shall survive and
continue in effect; and

                  (ii) the Note and Warrant Purchase Agreement shall be
terminated upon the surrender of Warrants as described in Section 5 above and
their cancellation by Oasys and shall thereafter be of no further force or
effect, including any and all terms originally listed as surviving any such
termination.

         7. RETURN OF PRODUCTS

         7.1 Return Materials Authorization. Subject to the terms and conditions
set forth in Section 4.1, if any Product is defective or otherwise not in
conformity with the requirements of this Agreement (a "Non-complying Product"),
in addition to its other rights and remedies hereunder, Larscom may return the
Non-complying Product for replacement or repair at Oasys' expense. *****
Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

         7.2 RMA. All Products returned by Larscom to Oasys, including
Non-complying Products, shall be accompanied by a Return Materials Authorization
("RMA"). Unless further verification is reasonably required by Oasys, Oasys
shall supply an RMA within three (3) business days of Larscom's request. If
Oasys fails to timely provide the RMA, Larscom may return the Products without
an RMA.

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

<PAGE>

         7.3 Return Charges. All Non-complying Products returned by Larscom to
Oasys, and all replacement or repaired Products shipped by Oasys to Larscom to
replace Non-complying Products, shall be shipped each way at Oasys' expense,
including transportation charges (round trip charges for replacement or reworked
Products). Notwithstanding the foregoing, if it is objectively determined to the
reasonable satisfaction of both parties that Products returned hereunder do not
constitute "Non-complying Products," Larscom shall reimburse Oasys for any and
all of its shipping and handling costs incurred hereunder.

         7.4 Repair Period. Oasys shall return the replacement or reworked
Products as soon as possible but in no event later than fifteen (15) business
days after receipt of the Non-complying Products from Larscom. If Oasys fails to
return the replacement or repaired Products to Larscom in a timely manner,
Larscom may reject the Non-complying Products and obtain a full refund of all
amounts paid by Larscom for the Products, without any deductions.

         7.5 Duty To Remove Marks. Oasys shall remove from all Products
rejected, returned or not purchased by Larscom, Larscom's name or any of
Larscom's trademarks, trade names, insignia, part numbers, symbols or decorative
designs prior to any other sale, use, or disposition of such Products by Oasys.

         8. PROCESS OR DESIGN CHANGES; COUNTRY OF MANUFACTURE.

         8.1 The following obligations shall be in effect until the last of the
Products purchased under the Final Order has been delivered to and accepted by
Larscom:

                  (i) Notice of Changes. Oasys shall give Larscom at least sixty
(60) days' prior written notice of any change to the Products or their
Specifications affecting the form, fit and function of the Products. On
Larscom's reasonable request, Oasys shall provide evaluation samples and other
appropriate information to Larscom.

                  (ii) Safety Standard Changes. Oasys shall immediately give
notice to Larscom if any change, upgrade, or substitution is required to make
the Products meet applicable safety standards or specifications, excluding any
changes which do not affect the Products' form, fit or function.

                  (iii) Country of Origin Certification. Upon Larscom's request,
Oasys shall provide Larscom with an appropriate certification stating the
country of origin for Products, sufficient to satisfy the requirements of: (a)
the customs authorities of the country of receipt and (b) any applicable export
licensing regulations, including those of the United States.

                  (iv) Country Of Origin Marking. If and as required, Oasys
shall mark each Product, or the container if there is no room thereon, with the
country of origin. Oasys shall, in marking Products, comply with the
requirements of the customs authorities of the country of receipt.

                  (v) Quality Program. Oasys shall maintain an objective quality
program for all Products supplied pursuant to the Final Order. Oasys shall, upon
Larscom's request, provide to Larscom copies of Oasys' program and supporting
factory test documentation.

         9. SUPPORT.

         9.1 Division of Product Support Obligations. Larscom shall be
responsible for all support obligations for any Product manufactured pursuant to
the License granted in the License Agreement and all direct first-tier and
second-tier support to its customers. Oasys shall continue to bear the
responsibility to provide third-tier product support for Products manufactured
prior to the Effective Date and Products manufactured under this Agreement
pursuant to the Final Order or any other Purchase Order submitted by Larscom and
accepted by Oasys; provided, however, that such support obligations (including
all obligations under this Section 9) shall terminate six (6) months after the
Effective Date. Notwithstanding the foregoing, Oasys shall continue to be
responsible for all of its warranty obligations as set forth in Section 4 above.

<PAGE>
         9.2 Product Support. Subject to Section 9.1, Oasys shall support
Larscom by telephone from 8:00 a.m. through 5:00 p.m., p.t., including direct
dial into the equipment of any Larscom customer at any location. On Larscom's
reasonable request, Oasys shall travel with Larscom to a Larscom customer site
and, if there proves to be a defect in the Product, each of Oasys and Larscom
shall bear their own travel and service costs for such on-site call. If the
Product is shown not to be defective in any way, Larscom shall pay Oasys at
Oasys' then-current consulting rate for all time spent by Oasys personnel and
shall reimburse Oasys for its personnel's reasonable travel and living expenses
during that on-site visit in accordance with the expense reimbursement
procedures described in Section 10.2. The current consulting rate as of the
effective date of this Agreement is $150/hr + expenses (M-F, 8:00 am to 5:00 pm)
and $225/hr + expenses (nights and weekends).

         9.3 Defect Reports. Oasys shall notify Larscom of the resolution of any
defects discovered in any Product and shall provide Larscom with the necessary
data, equipment and/or software to allow Larscom to distribute the solution to
its customers. Larscom shall periodically supply Oasys with available repair
data or defect reports, including field failure rate data, inspection tests and
strife tests. On Larscom's request, Oasys shall supply to Larscom available
repair data from Oasys' service facilities.

         10. TRANSITION SUPPORT.

         10.1 Transitional Support. During the Transitional Support Period (as
defined below) and only during such period, Oasys shall provide transitional
support services to Larscom (and such personnel designated by Larscom) to
effectively transfer to Larscom all know-how and information relating to the
design, development, implementation, manufacture, testing, applications,
support, existing capabilities, features, functions, uses, specifications and
operation of the Products, set-up of the Testing Equipment and use of the
Technology Deliverables so as to permit Larscom to exercise fully its rights
under the License Agreement and this Agreement, including without limitation,
the right to design, develop, manufacture, test, use, sell, support and improve
the Products in accordance with the License Agreement ("Transitional Support").
Upon requests made by Larscom from time-to-time to the Chief Executive Officer
or Vice President, Engineering of Oasys, Oasys shall provide up to twenty-four
(24) man-weeks of Transitional Support during the three (3)-month period
following the Effective Date (the "Transitional Support Period"). Transitional
Support shall consist of tasks to be determined by Larscom. The schedule for
Transitional Support shall be mutually agreed upon by the parties and Oasys
shall use its best efforts to adhere to the agreed upon schedule for the
Transitional Support.

         10.2 Transitional Support Fees. Larscom will pay Oasys for Transitional
Support at the hourly rate of *****($*****) and shall pay for reasonable travel,
meal and lodging expenses and other expenses incurred by Oasys which are
directly related to such Transitional Support, for which Oasys agrees to submit
supporting documentation as Larscom may reasonably require. Oasys shall submit
to Larscom a weekly statement identifying each Oasys employee performing
Transitional Support hereunder, the number of hours spent on a daily basis by
each individual providing Transitional Support during such week and a brief
description of the Transitional Support services rendered on each day. Oasys
shall use commercially reasonable efforts at all times during the Transitional
Support Period to make available technically competent, qualified and
experienced Oasys employees and avoid last minute substitutions.

         10.3 Certification. Oasys hereby represents and warrants to Larscom
that each of the Products excluding the Product identified as Orion 5001 Shelf &
Backplane (part no. 815-00074-002): (a) has passed UL/cUL and FCC certification,
and (b) has undergone or is presently undergoing the NEBS-3 and, as applicable,
CE mark testing and certification processes. Oasys covenants that it will use
all commercially reasonable efforts to successfully complete the NEBS-3 and, as
applicable, CE mark certification for each of the Products as soon as
practicable. Oasys further covenants that for each of the Products for which
UL/cUL, FCC, NEBS-3 and CE mark certification is obtained, Oasys will take steps
to have Larscom designated as a multiple listee, OEM or like designation with
respect to each

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

<PAGE>

such Product. As and when received by Oasys, Oasys will provide copies of
certifications or other written confirmation of UL/cUL, NEBS-3, FCC and CE mark
certifications for the Products and Larscom's designation as a multiple listee,
OEM or like designation with respect to each such Product. The obligations of
Oasys under this Section 10.3 shall survive any expiration or termination of
this Agreement. The parties agree to cooperate and negotiate in good faith to
achieve NEBS-3 certification for the Product identified as Orion 5001 Shelf &
Backplane (part no. 815-00074-002) and reach agreement upon a fair and equitable
cost sharing scheme.

         11. INTELLECTUAL PROPERTY RIGHTS

         11.1 Infringement Indemnity. Oasys shall defend, indemnify and hold
Larscom, its affiliates and Customers and their respective directors, officers,
employees, agents and representatives harmless from and against any and all
claims, actions, damages or other liabilities, including reasonable attorney's
fees (collectively, "Damages") arising from any claim that any Product, any
portion thereof or any related Proprietary Rights therein or the exercise of
such rights, constitutes an infringement or unauthorized use of any third
party's intellectual property rights (each, an "Infringement Action"). The
foregoing indemnity shall apply to Products supplied by Oasys under the OEM
Agreement as well as under this Agreement or manufactured pursuant to the
License. Notwithstanding the foregoing, Oasys shall have no obligation to
indemnify Larscom against any Infringement Action arising out of: (i) the
Larscom Equipment, (ii) the combination of the Larscom Equipment and any Product
or (iii) any modification of the Products by Larscom, its affiliates or its
customers.

         11.2 Procedures. Larscom shall give Oasys prompt notice of any
Infringement Action and shall give Oasys sole authority, information and
assistance (at Oasys' expense) to defend against or settle the Infringement
Action, provided that Oasys shall not enter into any settlement that affects
Larscom's rights or interest without Larscom's prior written approval. Larscom
shall at all times have the right to instruct its own counsel and defend and
settle any Infringement Action where Oasys has failed to take reasonable and
timely steps to defend such action.

         11.3 Indemnity by Larscom. Larscom shall defend, indemnify and hold
Oasys, its affiliates and customers and their respective directors, officers,
employees, agents and representatives harmless from and against any and all
Damages arising from any Infringement Action arising out of: (i) the Larscom
Equipment, (ii) the combination of the Larscom Equipment and any Product, to the
extent that the claim is attributable to the combination and not the underlying
Product, or (iii) any modification of the Products by Larscom, its affiliates or
Customers, to the extent that the claim is related to the modification itself
and not the underlying Product. Notwithstanding the foregoing, Larscom shall
have no obligation to indemnify Oasys against any Infringement Action arising
out of items (ii) and (iii) above that is attributable to choice of
configuration that is part of the Product features as set forth in the Customer
Documentation.

         11.4 Duty To Notify. Oasys shall give Larscom prompt notice of any
Infringement Action and shall give Larscom sole authority, information and
assistance (at Larscom's expense) to defend against or settle the Infringement
Action, provided that Larscom shall not enter into any settlement that affects
Oasys' rights or interest without Oasys' prior written approval.

         12. PRODUCT LIABILITY INDEMNIFICATION.

         12.1 Product Liability Indemnification. Oasys shall defend, indemnify
and hold Larscom, its affiliates and Customers and their respective directors,
officers, employees, agents and representatives harmless from and against any
and all Damages (as defined in Section 11, above) specifically resulting from
the injury to or death of any person or damage to, or loss or destruction of,
any real property or tangible personal property and arising out of any claim
that any Product supplied hereunder is defective in design or manufacture. The
foregoing indemnity shall also apply to (i) Products supplied by Oasys under the
OEM Agreement, and (ii) Products manufactured by Larscom under the license
granted by Oasys to Larscom in the License Agreement to the extent arising out
of any defects in Oasys' design of the Products. Oasys will not be liable for
and will not be obligated to indemnify Larscom against any claim made against a
Product to the extent that such claim arises out of a defect in Larscom's
manufacture of the Product or out of the use of any Larscom or third party
product bundled with and/or sold together and used with the Product in a manner
contrary to the published documentation for the Product.

<PAGE>

         12.2 Procedures. Larscom shall give Oasys prompt notice of any action
hereunder and shall give Oasys sole authority, information and assistance (at
Oasys' expense) to defend against or settle such action, provided that Oasys
shall not enter into any settlement that adversely affects Larscom's rights or
interest without Larscom's prior written approval. Larscom shall at all times
have the right to instruct its own counsel and defend and settle any
Infringement Action where Oasys has failed to take reasonable and timely steps
to defend such action.

         12.3 Exclusion. However, Oasys shall have no indemnification obligation
or liability under Section 12.1 for Damages to the extent resulting from: (a)
any party's use of a Product in a manner other than for which it was intended,
(b) any party's modification of a Product, (c) the misuse, neglect, damage,
unauthorized repair or improper testing or storage of any Product, (d) any
party's use of the Larscom Equipment, or (e) Oasys' adherence to Larscom's
designs, instructions or directions.

         12.4 Indemnity by Larscom. Larscom shall defend, indemnify and hold
Oasys, its affiliates and its customers and their respective directors,
officers, employees, agents and representatives harmless from and against any
and all Damages specifically resulting from the injury to or death of any person
or damage to, or loss or destruction of, any real property or tangible personal
property and arising out of any claim that any Larscom Equipment (excluding the
Products supplied hereunder), any combination of the Larscom Equipment and any
Product or any modification of the Products by Larscom, its affiliates or its
customers is defective in design or manufacture.

         12.5 Duty To Notify. Oasys shall give Larscom prompt notice of any
action hereunder and shall give Larscom sole authority, information and
assistance (at Larscom' expense) to defend against or settle such action,
provided that Larscom shall not enter into any settlement that affects Oasys'
rights or interest without Oasys' prior written approval.

         13. INSURANCE.

         During the term hereof, Oasys shall maintain, with insurers acceptable
to Larscom, the following minimum insurance protecting Oasys and Larscom against
liability from damages because of injuries, including death, suffered by persons
including employees of Larscom, and liability from damages to property arising
from or growing out of Oasys' operations in connection with the performance of
this Agreement:

  --------------------------------- -----------------------------------------
  COVERAGE                          LIMITS
  --------------------------------- -----------------------------------------
  Commercial General Liability      $2,000,000 General/Aggregate

                                    $2,000,000 Products/Completed Operations
                                    Aggregate

                                    $1,000,000 Combined Limit/Each Occurrence
  --------------------------------- -----------------------------------------
  Product Liability                 $2,000,000 General Aggregate
  --------------------------------- -----------------------------------------

         14. CONFIDENTIALITY.

         14.1 Each party acknowledges that all information relating to the
business, products and operations of the other party which it learns or has
learned during or prior to the Term is the valuable, confidential and
proprietary information of the disclosing party. The receiving party shall
maintain all confidential information disclosed hereunder by the disclosing
party in confidence and shall not disclose such information to any third party
other than those of its employees or contractors with a need to know such
information; provided that each such employee or contractor shall have executed
a confidentiality agreement or be otherwise bound by the obligations of the
receiving party hereunder. The receiving party shall safeguard the confidential
information with the same degree of care which it uses to protect its own
confidential information.

<PAGE>

         14.2 This Section 14 shall not apply to any information which: (i) is
already lawfully in the receiving party's possession (unless received pursuant
to a nondisclosure agreement); (ii) is or becomes generally available to the
public through no fault of the receiving party; (iii) is disclosed to the
receiving party by a third party who may transfer or disclose such information
without restriction; (iv) is required to be disclosed by the receiving party as
a matter of law (including, without limitation, security law requirements),
governmental order or judicial mandate; provided that the receiving party will
use all reasonable efforts to provide the disclosing party with prior notice of
such disclosure; (v) is disclosed by the receiving party with the disclosing
party's approval; and (vi) is independently developed by the receiving party
without any use of confidential information. In all cases, the receiving party
will use all reasonable efforts to give the disclosing party ten days' prior
written notice of any disclosure of information hereunder.

         14.3 Each party acknowledges that any breach of this Section by a
receiving party will irreparably harm the disclosing party. Accordingly, on any
such breach, the disclosing party shall be entitled to promptly seek injunctive
relief in addition to any other remedies which it may have at law or in equity.
Disclosure of confidential information under this Agreement may take place for a
period of two (2) years from the Effective Date. The confidentiality obligations
of the receiving party shall survive and continue for a period of ten (10) years
from the date of disclosure.

         15. LIMITATION OF LIABILITY.

         EXCEPT FOR ONE PARTY'S MISAPPROPRIATION OF THE OTHER PARTY'S
CONFIDENTIAL INFORMATION OR INTELLECTUAL PROPERTY OR BREACH OF SECTIONS 11 OR 12
ABOVE, NEITHER PARTY SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING BUT NOT LIMITED TO LOSS OF PROFITS OR COST OF
PROCUREMENT OF SUBSTITUTE GOODS) ARISING OUT OF THIS AGREEMENT, REGARDLESS OF
WHETHER SUCH DAMAGES ARE BASED ON TORT, WARRANTY, CONTRACT OR ANY OTHER LEGAL
THEORY EVEN IF THE DEFAULTING PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES. NOTWITHSTANDING ANY OTHER PROVISION OF THIS AGREEMENT, IN NO EVENT
SHALL THE AGGREGATE LIABILITY OF ANY PARTY HEREUNDER EXCEED THE AMOUNT OF THE
PREPAYMENT UNDER MADE UNDER SECTION 3.2.

         16. TERM AND TERMINATION

         16.1 Term. This Agreement shall be effective as of the Effective Date
and shall remain in effect until the later of: (i) the delivery to Larscom of
all of the Products purchased pursuant to the Final Order; or (ii) six (6)
months after the Effective Date (the "Term").

         16.2 Termination for Breach. If either party materially breaches this
Agreement, the other party may terminate this Agreement on thirty (30) days'
prior written notice to the other party unless such breach is cured within such
thirty (30)-day notice period or, if such breach is curable but cannot with all
diligent efforts be cured in thirty (30) days, the breaching party has commenced
good faith efforts to cure such breach and provided that the breach is cured
within forty five (45) days.

         16.3 Rights Upon Breach. If Oasys terminates this Agreement due to
Larscom's uncured breach, Larscom shall remain obligated to pay for Products
delivered under any outstanding Purchase Orders submitted by Larscom prior to
such termination (and accepted in accordance with Section 3.2). If Larscom
terminates this Agreement due to Oasys' uncured breach, Larscom will not be
required to purchase Oasys' inventory of Products or work-in-progress made
pursuant to the Final Order and Oasys shall immediately refund to Larscom the
unapplied portion of the Prepayment, if any.

         16.4 Survival. The following Sections of this Agreement shall survive
any termination hereof: 4,9,10,11,12,14,15,16,18,19 and 22 (as applicable).

         17. LIMITED NON-SOLICITATION OF CUSTOMER AND PARTNERS.

<PAGE>

         17.1 For a period of six (6) months immediately following the Effective
Date, Larscom shall not: (i) directly or indirectly solicit the Selected Oasys
Customers (set forth in Exhibit D) for sales of Products or (ii) establish
partnerships or joint ventures for the commercialization of Products with
Selected Oasys Partners (as set forth in Exhibit D).

         17.2 For a period of six (6) months immediately following the Effective
Date, Oasys shall not directly or indirectly solicit the Selected Larscom
Customers (set forth in Exhibit D) for sales of Products.

         17.3 A breach of any obligation under this Section 17.3 shall be a
material breach for which the non-breaching party may terminate this Agreement
under Section 16.2.

         18. OASYS CONTRACT MANUFACTURING.

         Larscom will establish relationships with contract manufacturers other
than Symprotek and UMAI for the manufacture of the Products by not later than
twelve (12) months after the Effective Date. For the avoidance of doubt, the
foregoing obligations do not apply to any product not listed in Exhibit A.

         19. NON-SOLICITATION OF EMPLOYEES.

         For a period of two (2) years from the Effective Date, neither party
shall, directly or indirectly, solicit the employment or services of any
employee or individual consultant of the other party, without the prior written
consent of the other party. Notwithstanding the foregoing, either party may
engage in general solicitations of employment not specifically targeted at any
of the other party's employees, and either party may hire former employees of
the other party.

         20. BUSINESS CONDUCT.

         The parties acknowledge and agree that upon the execution of this
Agreement, except as specifically provided in Sections 14,17 and 18 or in
Section 2.2 of the License Agreement, each party will be free to compete within
the marketplace for the design, manufacture and sale of communications products.
Having regard to the past relationship of the parties, and the ongoing
relationship pursuant to this Agreement and the License Agreement, each party
agrees to use commercially reasonable efforts to avoid any undue malicious
conduct with respect to each other's position in the marketplace. To this end,
the executive management of each party will endeavor to foster within that
party's organization an atmosphere of respect for the other party, to the extent
it is commercially reasonable to do so.

         21. NON-EXCLUSIVIEY; NO FURTHER OBLIGATIOND.

         The parties expressly acknowledge and agree that this Agreement does
not create an exclusive supply or purchase relationship. Except as expressly
provided in Sections 17.1 and 18, Larscom may freely engage any third-party
suppliers and manufacturers to meet its product supply needs and solicit
business from any potential customers. Except as expressly provided in Section
17.2, Oasys may freely deal with any potential customers of its products.

         22. MISCELLANEOUS

         22.1 Entire Agreement. This Agreement, including its Exhibits A through
D, constitutes the entire agreement between the parties, supersedes all prior
communications, representations, negotiations and agreements, whether oral or
written and may only be modified in a writing signed by an authorized
representative of each party.

         22.2 Amendment. No agreements amending, modifying or supplementing the
terms hereof shall be effective except by means of a written document signed by
the duly authorized representatives of both parties.

         22.3 Successors and Assigns. This Agreement shall be binding upon and
inure to the benefit of Oasys, Larscom and their respective successors and
permitted assigns. Either party may at any time assign or otherwise transfer to
any other person or entity all or part of its rights or obligations under this
Agreement in connection with

<PAGE>

an acquisition of all or substantially all of its assets or business relating to
the Products or this Agreement or an acquisition of a controlling interest in
its equity securities or in connection with a merger, consolidation,
reorganization or other like transaction. Except as provided herein, neither
party may assign or transfer any of its rights or obligations under this
Agreement without the prior written consent of the other party, which consent
shall not be unreasonably withheld (and any purported assignment without such
consent shall be void).

         22.4 Notices. All notices, consents or approvals required by this
Agreement shall be in writing and shall be deemed given five (5) days after
being sent by certified or registered air mail, postage prepaid, or when
received after being sent by facsimile (confirmed by such certified or
registered mail) or by commercial overnight courier service with tracking
capabilities, to the parties at the addresses provided below or such other
addresses as may be designated in writing by the respective parties pursuant to
the terms of this notice provision:

         Initial Addresses for Notice:
         Oasys Telecom, Inc.                     Larscom Incorporated
         7060 Koll Center Parkway, Suite 340     1845 McCandless Drive
         Pleasanton, CA  94566                   Milpitas, CA 95035
         Attn: Mr. Gerard Miille, CEO            Attn: Chief Executive Officer

         22.5 Governing Law. This Agreement shall be governed by and construed
in accordance with California law as applied to transactions taking place in
California between California residents. All disputes between the parties
arising out of or relating to this Agreement (other than actions seeking only
equitable remedies) shall be settled by binding arbitration pursuant to the
Commercial Arbitration Rules of the American Arbitration Association by an
arbitrator who is knowledgeable about telecommunications equipment. The
arbitrator may award any legal or equitable remedy and may, in his discretion,
require one party to pay the costs of the arbitration as well as the fees and
expenses, including reasonable attorneys' fees, of the other party. In the
absence of any such ruling, each party shall bear its own costs in connection
with an arbitration proceeding hereunder and the parties shall share the costs
of the arbitration equally.

         22.6 Headings. Headings included herein are for convenience only and
shall not be used to interpret or construe this Agreement.

         22.7 Severability. If any provision of this Agreement shall be held
void, invalid, illegal or unenforceable, that provision shall be limited or
eliminated to the minimum extent necessary so that this Agreement shall
otherwise remain in full force and effect and fully enforceable.

         22.8 Construction of Agreement. This Agreement is the product of
extensive negotiations between the parties hereto and no party shall be deemed
the drafter of this Agreement. No portion of this Agreement shall be construed
against any party as drafter.

         22.9 No Joint Venture. Nothing contained in this Agreement shall be
deemed or construed as creating a joint venture or partnership between the
parties. Except as expressly set forth, no party is by virtue of this Agreement
authorized as an agent, employee or legal representative of any other party, and
the relationship of the parties is, and at all times shall continue to be, that
of independent contractors.

         22.10 Counterparts. This Agreement may be executed in counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one and the same instrument.

         22.11 No Publicity. No press releases or publicity of any kind related
to this Agreement shall be made by one party hereto without the prior written
consent of the other party. Notwithstanding the foregoing, the obligations
contained in this Section 22.11 shall not apply to the extent that disclosure
and publicity is necessary: (i) to comply with any law, order or regulation of a
governmental agency or a court of competent jurisdiction (including, without
limitation, any securities law requirement); except, however, that a party will
use reasonable efforts to seek confidential treatment of the economic terms
herein, it being understood that such treatment is at the discretion of the
securities regulation authorities and no assurances of such treatment can be
given; or (ii) in perfecting any security interest pursuant to this Agreement or
the License Agreement. In addition to the foregoing, Larscom shall be

<PAGE>

permitted to disclose the existence of the License Agreement and the Supply
Agreement (but excluding the economic terms herein) to authorized sublicensees
as described in Section 2.2 of the License Agreement and, subject to Article 17,
to any of prospective customers.

         22.12 Force Majeure. Neither party shall be liable to the other for its
failure to perform any obligations under this Agreement during any period in
which such performance is rendered impracticable or impossible due to
circumstances beyond its reasonable control, including acts of God, floods,
earthquakes, riots or other hostilities, strikes or government actions, provided
that the party experiencing the delay promptly notifies the other of the delay.

<PAGE>

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first set forth above.

Larscom Incorporated                       Oasys Telecom, Inc.

By: /s/ Daniel L. Scharre                  By: /s/ Gerard Miille
    ---------------------                      -----------------

Name: Daniel L. Scharre                    Name: Gerard Miille
     ------------------                         --------------

Title: President and Chief                 Title: President and Chief
         Executive Officer                          Executive Officer
         -----------------                          -----------------

<PAGE>
                                    Exhibit A

                                    PRODUCTS

 ---------------- --------------------------------------------------------------
 Part Number      Item
 ---------------- --------------------------------------------------------------
 815-00063-001    Orion 5000 23" Shelf & Backplane
 ---------------- --------------------------------------------------------------
 815-00073-002    Orion 5000 19" Shelf & Backplane
 ---------------- --------------------------------------------------------------
 810-00062-010    MPU Module with Ethernet Aux Board, -48V
 ---------------- --------------------------------------------------------------
 810-00068-012    Programmable M13 Module, T1, -48V, "+" Version
 ---------------- --------------------------------------------------------------
 810-00068-003    Programmable M13 Module, E1, -48V
 ---------------- --------------------------------------------------------------
 810-00068-009    T3-Only M13 Module, -48V
 ---------------- --------------------------------------------------------------
 810-00067-002    OMX-3 Module, -48V
 ---------------- --------------------------------------------------------------
 810-00066-001    M13 IN Rim
 ---------------- --------------------------------------------------------------
 810-00065-001    M13 OUT Rim
 ---------------- --------------------------------------------------------------
 810-00069-002    OMX3 IN Rim
 ---------------- --------------------------------------------------------------
 810-00069-001    OMX3 OUT Rim
 ---------------- --------------------------------------------------------------
 815-00050-009    Module Blank
 ---------------- --------------------------------------------------------------
 835-00081-002    RIM Blank
 ---------------- --------------------------------------------------------------

 ---------------- --------------------------------------------------------------
 815-00077-002    Orion 5003 Shelf & Backplane, 1 MPU w/Aux, 2 OMX-3's
 ---------------- --------------------------------------------------------------
 815-00074-002    Orion 5001 Shelf & Backplane, 1 MPU w/Aux, 2 T3-Only M13's
 ---------------- --------------------------------------------------------------
 810-00062-009    MPU Module with Ethernet Aux Board, -48 V, no faceplate
 ---------------- --------------------------------------------------------------
 810-00067-003    OMX-3 Module, -48V, no faceplate
 ---------------- --------------------------------------------------------------
 810-00068-006    T3-Only M13 Module, T1, -48V, no faceplate
 ---------------- --------------------------------------------------------------

 ---------------- --------------------------------------------------------------
 815-00011-xxx    Cable, UID, Various lengths
 ---------------- --------------------------------------------------------------
 815-00055-xxx    Cable, Null Modem, Various lengths
 ---------------- --------------------------------------------------------------
 815-00064-xxx    Cable, RIM to Champ Plug, Various lengths
 ---------------- --------------------------------------------------------------
 815-00065-xxx    Cable, Champ Receptacle to Champ Receptacle, Various Lengths
 ---------------- --------------------------------------------------------------
 815-00066-xxx    Cable, Champ Receptacle to Wirewrap, Various Lengths
 ---------------- --------------------------------------------------------------
 815-00069-xxx    Cable, Champ Receptacle to Champ Plug, Various Lengths
 ---------------- --------------------------------------------------------------
 815-00082-001    Cable, OMX3 Rim to M13 Rim, 14"
 ---------------- --------------------------------------------------------------
 815-00082-002    Cable, OMX3 Rim to M13 Rim, 24"
 ---------------- --------------------------------------------------------------
 815-00033-xxx    Cable, DS3 Coax, Straight BNC's, Various Lengths
 ---------------- --------------------------------------------------------------
 815-00053-xxx    Cable, DS3 Coax, Straight/Right Angle BNC's, Various Lengths
 ---------------- --------------------------------------------------------------
 131-00004-001    Adapter, Right Angle, BNC, Male-to-Female
 ---------------- --------------------------------------------------------------

 ---------------- --------------------------------------------------------------
 890-00009-002    Version 4.1 Basic Software including terminal, telnet, SNMP,
                    & Web Server
 ---------------- --------------------------------------------------------------
 ---              Operations Manuals, Various
 ---------------- --------------------------------------------------------------

 ---------------- --------------------------------------------------------------

<PAGE>

                                    Exhibit B

                                 Specifications

Please see attached Oasys product specification sheets for:

1.   Mini-Mux 155 (OC-3/STM-1)

2.   Mini-Mux 280 M13 Multiplexer

3.   Exchange Mux II Avanced Multiplexer

                        [To be attached prior to signing]

<PAGE>

                                    Exhibit C

                                     Prices

Oasys Transfer Price Discount Schedule Effective for Deliveries After August 28,
2001
<TABLE>
<CAPTION>
<S>                     <C>                             <C>                      <C>                    <C>          <C>
------------------------------------------------------------------------------------------------------------------------------
M1-3 Prog 23"                                            Attachment A
------------------------------------------------------------------------------------------------------------------------------
2RU SHELF            Programmable M1-3 with STS-1 & T3 Capability -- 1 Redundant Pair of M1-3s
------------------------------------------------------------------------------------------------------------------------------
Part Number          Description                         Oasys List Price      QTY    Oasys Total    Discount    Cost to
                                                                                      List           per unit    Larscom
------------------------------------------------------------------------------------------------------------------------------
815-00063-001        23" Shelf                           $ *****              *****   $    *****    *****%       $*****

-------------------------------------------------------------------------------------------------------------------------
890-00009-002        Software Latest Rel. incl. SNMP     $ *****              *****   $    *****    *****%       $*****

-------------------------------------------------------------------------------------------------------------------------
810-00062-010        MPU -48V w/Aux. Board               $ *****              *****   $    *****    *****%       $*****

Included in MPU      Ethernet Daughter Board             $ *****              *****   $    *****    *****%       $*****

-------------------------------------------------------------------------------------------------------------------------
Included in Sftwre   SNMP Upgrade (1 per MPU)            $ *****              *****   $    *****    *****%       $*****

-------------------------------------------------------------------------------------------------------------------------
700-00052-004*       Total Starter Kit (Larscom)         $ *****                      $    *****    *****%       $*****

------------------------------------------------------------------------------------------------------------------------------
*All Starter Kits Discounts per Line Item  Do not Apply to Individual Component Purchases.
------------------------------------------------------------------------------------------------------------------------------
810-00068-004        M13 MUX (PM1-3)                     $ *****              *****   $    *****    *****%       $ *****

---------------------------------------------------------------------------------------------------------------------------
810-00068-003        M13 MUX (E1)                        $ *****              *****   $   *****     *****%       $ *****

---------------------------------------------------------------------------------------------------------------------------
810-00065-001        Output RIM                          $ *****              *****   $    *****    *****%       $ *****

---------------------------------------------------------------------------------------------------------------------------
810-00066-001        Input RIM                           $ *****              *****   $    *****    *****%       $ *****
---------------------------------------------------------------------------------------------------------------------------
815-00050-009        Module, Blank, 1 Slot Wide (Lars)   $ *****              *****   $    *****    *****%       $ *****

---------------------------------------------------------------------------------------------------------------------------
815-00071-001        RIM, Blank                          $ *****              *****   $    *****    *****%       $ *****

---------------------------------------------------------------------------------------------------------------------------
Total M1-3 Kit                                           $ *****                      $    *****    *****%       $ *****

---------------------------------------------------------------------------------------------------------------------------

Total Starter & M1-3 Kit                                 $ *****                      $    *****    *****%       $ *****

---------------------------------------------------------------------------------------------------------------------------

815-00064-002        Cable, 28DS1/E, 10'                 $ *****              *****   $    *****    *****%       $ *****

------------------------------------------------------------------------------------------------------------------------

815-00011-002        Cable, Craft, 15'                   $ *****              *****   $    *****    *****%       $ *****

------------------------------------------------------------------------------------------------------------------------
Total Cables                                             $ *****                      $    *****    *****%       $ *****

---------------------------------------------------------------------------------------------------------------------------

Grand Total                                              $ *****                      $    *****    *****%       $ *****

------------------------------------------------------------------------------------------------------------------------------

T3 ONLY 23"
------------------------------------------------------------------------------------------------------------------------------
2RU SHELF             M1-3 with T3 CAPABILITY ONLY -- 1 Redundant Pair of M1-3s
------------------------------------------------------------------------------------------------------------------------------
Part Number          Description                         Oasys List Price      QTY    OasysTotal     Discount    Cost to
                                                                                      List           per unit    Larscom
------------------------------------------------------------------------------------------------------------------------------
815-00063-001        23" Shelf                            $  *****            *****   $  *****         *****%       $    *****

-----------------------------------------------------------------------------------------------------------------
890-00009-002        Software Latest Rel. incl. SNMP      $  *****            *****   $  *****         *****%       $    *****

-----------------------------------------------------------------------------------------------------------------
810-00062-010        MPU -48V w/Aux. Board                $   *****           *****   $  *****         *****%       $    *****

-----------------------------------------------------------------------------------------------------------------

Included in MPU      Ethernet Daughter Board              $  *****            *****   $  *****         *****%       $    *****

-----------------------------------------------------------------------------------------------------------------
Included in Sftwre   SNMP Upgrade (1 per MPU)             $  *****            *****   $  *****         *****%       $    *****

------------------------------------------------------------------------------------------------------------------
700-00052-004*       Total Starter Kit (Larscom)          $  *****                    $  *****         *****%       $    *****

--------------------------------------------------------------------------------------------------------------------------
*All Starter Kits Discounts per Line Item  Do not Apply to Individual Component Purchases

--------------------------------------------------------------------------------------------------------------------------
810-00068-009        M13 MUX -T3 ONLY                     $ *****             *****   $  *****         *****%       $    *****

--------------------------------------------------------------------------------------------------------------------
810-00065-001        Output RIM                           $  *****            *****   $  *****         *****%       $    *****

--------------------------------------------------------------------------------------------------------------------
810-00066-001        Input RIM                            $  *****            *****   $  *****         *****%       $    *****

-----------------------------------------------------------------------------------------------------------------------
815-00050-009        Module, Blank, 1 Slot Wide (Lars)    $  *****            *****   $  *****         *****%       $    *****

-----------------------------------------------------------------------------------------------------------------------
815-00071-001        RIM, Blank                           $  *****            *****   $  *****         *****%       $    *****

-----------------------------------------------------------------------------------------------------------------------
Total M1-3 Kit                                            $  *****            *****   $  *****         *****%       $    *****

------------------------------------------------------------------------------------------------------------------------------
</TABLE>

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

<PAGE>
<TABLE>
<S>                                                         <C>                    <C>        <C>         <C>         <C>

------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Starter & M1-3 Kit                                  $ *****                          $ *****      *****%     $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
815-00064-002        Cable, 28DS1/E, 10'                  $ *****              *****       $ *****      *****%     $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00011-002        Cable, Craft, 15'                    $ *****              *****       $ *****      *****%     $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Cables                                              $ *****                          $ *****      *****      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Grand Total                                               $ *****                          $ *****      *****      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
T3 ONLY

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
1RU Shelf             M1-3 with T3 CAPABILITY ONLY -- 1 Redundant Pair of M1-3s, 1MPU
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Part Number          Description                         Oasys List Price      QTY    OasysTotal     Discount    Cost to
                                                                                      List           per unit    Larscom
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     1 RU Box                                                  *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     Software Latest Rel. incl. SNMP                           *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     MPU -48V w/Aux. Board                                     *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in MPU      Ethernet Daughter Board                                   *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in Sftwre   SNMP Upgrade                                              *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     M13 MUX (No E1)                                           *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     Output RIM                                                *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     Input RIM                                                 *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
700-00056-001        Total 1 Ru Box                       $ *****              *****       $ *****      *****      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00064-002        Cable, 28DS1/E, 10'                  $ *****              *****       $ *****      *****      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00011-002        Cable, Craft, 15'                    $ *****              *****       $ *****      *****      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Cables                                              $ *****                          $ *****      *****      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Grand total                                               $ *****                          $ *****      *****      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
OC3 Only

------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
1RU Shelf            1 Pair OC3 with 1 MPU
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Part Number          Description                         Oasys List Price      QTY    OasysTotal     Discount    Cost to
                                                                                      List           per unit    Larscom
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     1 RU Box                                                  *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     Software Latest Rel. incl. SNMP                           *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     MPU -48V w/Aux. Board                                     *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in MPU      Ethernet Daughter Board                                   *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in Sftwre   SNMP Upgrade                                              *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     OC3/DS3 MUX                                               *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     Output RIM                                                *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
                     Input RIM                                                 *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
700-00057-001        Total 1 Ru Shelf                     $ *****              *****       $ *****      *****%     $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
TBD                  TBD OC3                              $ *****              *****       $ *****      *****%     $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00011-002        Cable, Craft, 15'                    $ *****              *****       $ *****      *****%     $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Cables                                              $ *****              *****       $ *****      *****%     $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Grand total                                               $ *****                          $ *****      *****%     $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
M1-3 Prog 19"

------------------------------------------------------------------------------------------------------------------------------
</TABLE>

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

<PAGE>
<TABLE>
<S>                 <C>                                  <C>               <C>           <C>           <C>          <C>

------------------------------------------------------------------------------------------------------------------------------
2RU SHELF          Programmable M1-3 with STS-1 & T3 Capability -- 1 Redundant Pair of  M1-3s

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Part Number        Description                          Oasys List Price    QTY          OasysTotal     Discount    Cost to
                                                                                         List           per unit    Larscom
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00073-001      19" Shelf                            $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
890-00009-002      Software Latest Rel. incl. SNMP      $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00062-010      MPU -48V w/Aux. Board                $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
Included in MPU    Ethernet Daughter Board              $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in Sftwre SNMP Upgrade (1 per MPU)             $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
700-00053-002*     Total Starter Kit (Larscom)          $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
*All Starter Kits Discounts per Line Item  Do not Apply to Individual Component Purchases.
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00068-004      M13 MUX (PM1-3)                      $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00068-003      M13 MUX (E1PM13E)                    $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00065-001      Output RIM                           $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00066-001      Input RIM                            $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
815-00050-009      Module, Blank, 1 Slot Wide (Lars)    $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00071-001      RIM, Blank                           $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total M1-3 Kit                                          $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Starter & M1-3 Kit                                $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00064-002      Cable, 28DS1/E, 10'                  $ *****             *****        $ *****        *****%      $ *****
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00011-002      Cable, Craft, 15'                    $ *****             *****        $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Cables                                            $ *****             *****        $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Grand Total                                             $ *****             *****        $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
T3 ONLY 19"

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
2RU SHELF          M1-3 with T3 CAPABILITY ONLY -- 1 Redundant Pair of M1-3s
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Part Number        Description                        Oasys List Price    QTY            OasysTotal     Discount     Cost to
                                                                                         List           per unit     Larscom
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00073-001      19" Shelf                          $ *****             *****          $ *****       *****%       $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
890-00009-002      Software Latest Rel. incl. SNMP    $ *****             *****          $  *****       *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
810-00062-010      MPU -48V w/Aux. Board              $ *****             *****          $  *****       *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in MPU    Ethernet Daughter Board            $  *****            *****          $  *****       *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in Sftwre SNMP Upgrade (1 per MPU)           $ *****             *****          $  *****       *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
700-00053-002*     Total Starter Kit (Larscom)        $ *****             *****          $  *****       *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
*All Starter Kits Discounts per Line Item  Do not Apply to Individual Component Purchases.
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00068-009      M13 MUX -T3 ONLY                   $ *****             *****          $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00065-001      Output RIM                         $ *****             *****          $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00066-001      Input RIM                          $ *****             *****          $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00050-009      Module, Blank, 1 Slot Wide (Lars)  $ *****             *****          $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00071-001      RIM, Blank                         $ *****             *****          $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total M1-3 Kit                                        $ *****             *****          $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Starter & M1-3 Kit                              $ *****             *****          $ *****        *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00064-002      Cable, 28DS1/E, 10'                $ *****             *****          $ *****        *****%      $ *****

</TABLE>

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

<PAGE>
<TABLE>
<S>                                                         <C>               <C>       <C>            <C>          <C>

------------------------------------------------------------------------------------------------------------------------------
815-00011-002        Cable, Craft, 15'                    $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Cables                                              $ *****                     $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Grand Total                                               $ *****                     $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
OC3/DS3 Prog 23"

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
2RU SHELF             1 Redundant Pair of OC3/DS3 Cards
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Part Number          Description                         Oasys List Price      QTY    OasysTotal     Discount    Cost to
                                                                                      List           per unit    Larscom
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00063-001        23" Shelf                            $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
890-00009-002        Software Latest Rel. incl. SNMP      $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
810-00062-010        MPU -48V w/Aux. Board                $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in MPU      Ethernet Daughter Board              $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in Sftwre   SNMP Upgrade (1 per MPU)             $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
700-00052-004*       Total Starter Kit                    $ *****                     $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
*All Starter Kits Discounts per Line Item  Do not Apply to Individual Component Purchases.
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00067-002        OC3 to DS3 Cards                     $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00069-001        Output RIM                           $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00069-002        Input RIM                            $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00050-009        Module, Blank, 1 Slot Wide (Lars)    $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00071-001        RIM, Blank                           $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total OC3/DS3 Kit                                         $ *****                     $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Starter & OC3/DS3 Kit                               $ *****                     $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
TBD                  TBD OC3                              $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00011-002        Cable, Craft, 15'                    $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Cables                                              $ *****                     $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Grand Total                                               $ *****                     $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
OC3/DS3 19"

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
2RU SHELF             1 Redundant Pair of OC3/DS3 Cards
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Part Number          Description                         Oasys List Price      QTY    OasysTotal     Discount    Cost to
                                                                                      List           per unit    Larscom
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00073-001        19" Shelf                            $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
890-00009-002        Software Latest Rel. incl. SNMP      $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00062-010        MPU -48V w/Aux. Board                $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in MPU      Ethernet Daughter Board              $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Included in Sftwre   SNMP Upgrade (1 per MPU)             $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
700-00053-002*       Total Starter Kit                    $ *****                     $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
*All Starter Kits Discounts per Line Item  Do not Apply to Individual Component Purchases.
------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00067-002        OC3 to DS3 Cards                     $ *****             *****   $ *****         ****%       $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00069-001        Output RIM                           $ *****             *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
810-00069-002        Input RIM                            $*****              *****   $ *****         *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
</TABLE>

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

<PAGE>
<TABLE>
<S>                 <C>                                  <C>               <C>          <C>        <C>         <C>

------------------------------------------------------------------------------------------------------------------------------
815-00050-009      Module, Blank, 1 Slot Wide (Lars)    $ *****           *****      $ *****      *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00071-001      RIM, Blank                           $ *****           *****      $ *****      *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total OC3/DS3 Kit                                       $ *****           *****      $ *****      *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Starter & OC3/DS3 Kit                             $ *****           *****      $ *****      *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
TBD                TBD OC3                              $ *****           *****      $ *****       *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
815-00011-002      Cable, Craft, 15'                    $ *****           *****      $ *****     *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Total Cables                                            $  *****          *****      $ *****     *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------
Grand Total                                             $  *****          *****      $ *****     *****%      $ *****

------------------------------------------------------------------------------------------------------------------------------
</TABLE>

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

<PAGE>

                                    EXHIBIT D

                        LIMITED NON-SOLICITATION PARTIES

I.  Selected Oasys Customers

         *****

         *****

         *****

         *****

         *****

         *****

         *****

         *****

         *****

         *****

         *****

         *****

II.  Selected Larscom Customers

         *****

         *****

         *****

III.  Selected Oasys Partners

         *****

         *****

***** Confidential treatment has been requested for the redacted portions. The
confidential redacted portions have been filed separately with the Securities
and Exchange Commission.

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00042-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00042-of-00352.parquet"}]]