Document:

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                                                                    EXHIBIT 10.8

                              AGREEMENT OF SUBLEASE

         This Agreement of Sublease (this "Sublease") is made as of the 17th day
of March, 2000 by and between RENAISSANCE WORLDWIDE, INC., a Massachusetts
corporation, having an office at 52 Second Avenue, Waltham, Massachusetts 02451
("Sublessor"), and SITARA NETWORKS, INC., a Delaware corporation, having an
office at 52 Second Avenue, Waltham, Massachusetts 02451 ("Sublessee").

                                   WITNESSETH

         WHEREAS, by a certain Lease Agreement, dated as of June 30, 1998 (the
"Lease"), by and between Waltham 60/10 LLC ("Landlord"), as landlord, and
Sublessor, as tenant, Landlord leased to Sublessor certain premises consisting
of approximately 201,378 rentable square feet (the "Premises"), being all of the
rentable area in that certain building known as and numbered 52 Second Avenue,
Waltham, Massachusetts (the "Building"), which Premises are more particularly
described in the Lease, a copy of which Lease is annexed hereto as Exhibit A and
made a part hereof; and

         WHEREAS, Sublessee desires to sublease from Sublessor and Sublessor is
willing to sublease to Sublessee a portion of the Premises consisting of
approximately one-half of the second floor of the Building, containing
approximately 25,889 rentable square feet as more particularly shown on Exhibit
B annexed hereto and made a part hereof (the "Subleased Premises");

         NOW THEREFORE, in consideration of Ten Dollars ($ 10) in hand paid by
Sublessee to Sublessor, the mutual covenants herein contained and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto hereby agree as follows:

         1. Subleasing of Subleased Premises; Condition of Premises.

         (1) Sublessor hereby subleases to Sublessee and Sublessee hereby hires
from Sublessor, the Subleased Premises, upon and subject to all of the terms,
covenants, rentals and conditions hereinafter set forth. Sublessee expressly
acknowledges and agrees that Sublessor has made no representations with respect
to the Subleased Premises or the Building and is not obligated to make repairs
of or to perform any work at, the Subleased Premises, except as set forth
elsewhere in this Sublease.
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         (2) The Subleased Premises, containing approximately 25,889 rentable
square feet, as more particularly shown on Exhibit B attached hereto and made a
part hereof, is currently unfinished "shell" space. Sublessee and Sublessor have
agreed upon the layout/partitioning plan for the Subleased Premises, which
layout/partitioning plan is shown on Exhibit B. Sublessor shall, at Sublessor's
sole cost and expense, cause the Subleased Premises to be built out in
accordance with Exhibit B to a kind and quality of construction consistent with
that of the balance of the second floor, excluding any non-standard
improvements, including, but not limited to, any labs, special electrical (such
as any work to equip an office or cubicle for more than one computer),
mechanical or plumbing requirements, and all tel/data cabling. The net
additional costs and expenses of all such non-standard improvements, as well as
of any changes or additions to the plan on Exhibit B and of any delays caused by
such changes or additions, by Sublessee's failure to promptly respond to
Sublessor requests for approvals or consents or by any other act or negligence
of Sublessee or Sublessee's agents, contractors or employees ("Sublessee
Delays") shall be payable as Additional Rent by Sublessee to Sublessor upon
demand. Any such demand shall be accompanied by copies of contracts, paid
invoices or other suitable evidence of Sublessor's payment thereof or obligation
therefor. Sublessee also acknowledges and agrees that it is obligated at its
sole cost and expense to restore the Subleased Premises prior to the end of the
Term to general office use substantially in accordance with Exhibit C attached
hereto and made a part hereof, including, without limitation, the restoration of
each circled and checked area of the plan on Exhibit C in accordance with the
plan on Exhibit C. Such cost and expense shall be deemed Additional Rent. The
Commencement Date referred to in Section 2 below shall mean the earlier of (i)
such date as Sublessor delivers the Subleased Premises to Sublessee
substantially complete and suitable for Sublessee's use and occupancy but not in
any event prior to June 10, 2000 (such suitability shall be evidenced by a
certificate of occupancy and the architect's certificate of substantial
completion); (ii) such date as Sublessee takes occupancy of any portion of the
Subleased Premises for business purposes; or (iii) such date (after June 10,
2000) as the Subleased Premises would have been substantially complete but for a
delay in the build-out attributable to any change, addition or non-standard
improvement to the plan in Exhibit B requested by Sublessee or to other
Sublessee Delays as aforesaid. Notwithstanding the foregoing, Sublessee shall
have the right, so long as the same does not materially adversely affect the
progress or completion of Sublessor's work therein, to have access to the
Subleased Premises at least two weeks prior to such substantial completion date
(which Sublessor shall provide notice thereof) for the purpose of installing
Sublessee's furnishings and equipment, without such access being deemed to be
occupancy for Sublessee's business purposes. In the event that the Subleased
Premises are not substantially complete within ninety (90) days after June 10,
2000, as extended for all such Sublessee Delays and by any delays caused by
force majeure, which shall include strikes, inability to obtain materials,
casualties and other matters beyond Sublessor's reasonable control, then
Sublessee may terminate this Sublease by providing written notice to Sublessor
prior to such substantial completion. Sublessor shall use commercially
reasonable efforts to have the Subleased Premises substantially complete by June
10, 2000, as extended by any Sublessee Delays and by any delays caused by force
majeure, which shall include strikes, inability to obtain materials, casualties
and other matters beyond Sublessor's reasonable control.

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         (3) Notwithstanding anything to the contrary herein (i) the Subleased
Premises shall not include, and Sublessor expressly reserves the exclusive use
of (including continuous access to and from), Telephone Closet No. 2117; (ii)
Sublessor and Sublessee shall share appropriate usage of Telephone Closet No.
203; and (iii) Sublessee shall provide its own reception functions within the
Subleased Premises, and shall not have any right to representation
at/participation in Sublessor's reception on the first office level of the
Building.

         2. Term.

         The term (the "Term") of this Sublease shall commence on the
Commencement Date and shall expire at 11:59 p.m. on the last day of the calendar
month in which occurs the expiration of three (3) years from the Commencement
Date (the "Expiration Date"), unless sooner extended or terminated as
hereinafter provided.

         3. Fixed Rent.

         (1) For the period commencing on the Commencement Date, Sublessee shall
pay to Sublessor, in lawful money of the United States, a Fixed Rent at the rate
of eight hundred sixty-seven thousand two hundred eighty-one and 50/100 dollars
($867,281.50) per annum ($72,273.46 per month). Concurrently with the execution
of this Sublease, Sublessee shall deliver to Sublessor the first month's rent in
the amount of $72,273.46. For any partial month at the beginning of the Term,
Fixed Rent shall be appropriately prorated.

         (2) Fixed Rent shall be due and payable on the first (1st) day of each
calendar month during the Term at the office of Sublessor, or at such other
place as Sublessor may designate, at any time from time to time, without any
set-off or deduction of any kind whatsoever, except that Sublessee shall pay to
Sublessor the first monthly installment of Fixed Rent due under this Sublease
(together with such electricity charges as shall be due in accordance with
Section 23 of this Sublease), upon the execution of this Sublease.

         4. Additional Rent.

         (1) Beginning with the payment of Fixed Rent due for the 13th full
calendar month of the Term, Sublessee shall pay to Sublessor, as Additional
Rent, Sublessee's Proportionate Share, as hereinafter defined, of such amounts
as Sublessor from time to time gives notice to Sublessee that Sublessor is
obligated to pay to Landlord in respect of Operating Costs, including estimated
payments thereof, under and pursuant to Section 4.2 of the Lease, but only to
the extent such payments on an annualized basis, exceed, or are reasonably
estimated by Sublessor to exceed, $9.50 per rentable square foot per year.
Sublessee shall be entitled to Sublessee's Proportionate Share of any credit or
refund as and when received by Sublessor, and shall pay Sublessee's

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Proportionate Share of any additional payment required to be made by Sublessor,
as a result of the final determination of Operating Costs for any calendar year
as provided in Section 4.2 of the Lease to the extent the same exceeds $9.50 per
rentable square foot. Sublessee's Proportionate share shall be a fraction, the
numerator of which is the rentable square feet in the Subleased Premises and the
denominator of which is the rentable square feet in the Premises, currently
25,889/201,378 or 12.86%.

         (2) All amounts payable by Sublessee to Sublessor pursuant to this
Sublease, including, without limitation, Fixed Rent and Additional Rent, shall
be deemed to be and shall constitute rent for all purposes hereunder and, in the
event of any non-payment thereof, Sublessor shall have all of the rights and
remedies provided herein (including, without limitation, those rights and
remedies set forth in Section 10 hereof), at law or in equity for non-payment of
rent. The obligation of Sublessee to pay all amounts to Sublessor of Fixed Rent
and Additional Rent due hereunder, as well as any refund which may be due to
Sublessee hereunder, and of other amounts payable by Sublessor to Sublessor
under the Lease, as and to the extent incorporated herein and as modified
hereby, shall survive the Expiration Date or earlier termination of this
Sublease.

         5. Care, Surrender and Restoration of the Subleased Premises.

         (1) Without limiting any other provision of this Sublease or the Lease,
Sublessee shall take good care of the Subleased Premises, suffer no waste or
injury thereto and shall comply with all laws, orders and regulations applicable
to the Subleased Premises, the Building and Sublessee's use or manner of use
thereof, which are imposed on Sublessor, as tenant under the Lease, in
connection with the Subleased Premises and/or the Building; provided Sublessee
is given copies of any rules and regulations applicable to the Building; and
provided further that Sublessee shall have no obligation to make or pay for
alterations to the Subleased Premises that would be required for any office use,
as distinct from Sublessee's particular use thereof. Notwithstanding the first
paragraph of Section 6.1 of the Lease, Sublessee shall make no Alteration (as
defined in Article 6 of the Lease) to the Subleased Premises without the prior
written consent of Sublessor, and then only fully in compliance with the
applicable provisions of Article 6 of the Lease. In no event, however, shall
Sublessee have any right with respect to the elevator and atrium lobby area of
the Subleased Premises either (i) to make any Alteration, addition,
modification, decoration or fixturing, or (ii) to use it for any Sublessee
purpose whatsoever, except as set-forth herein.

         (2) Upon the Expiration Date or earlier termination of the Term,
Sublessee shall quit and surrender the Subleased Premises to Sublessor, broom
clean, in good order and condition, ordinary wear and tear excepted and
Sublessee shall remove all of its personal property therefrom. If the Expiration
Date or earlier termination of the Term falls on a Sunday, this Sublease shall
expire at noon on the immediately preceding Saturday unless such Saturday is a
legal holiday, in which case the Term shall expire at noon on the first business
day immediately

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preceding such Saturday. Sublessee shall observe and perform each of the
covenants contained in this Sublease and Sublessee's obligations hereunder shall
survive the Expiration Date or earlier termination of this Sublease, but only to
the extent provided herein or incorporated by reference from the Lease.

         6. Use.

         Sublessee shall use and occupy the Subleased Premises as and for office
use and for no other purpose. Sublessee shall have access to the Subleased
Premises 24 hours a day, seven days a week, subject to Sublessor's usual
security measures and subject also to fire, casualty, emergency repairs and
other such matters beyond Sublessor's reasonable control.

         7. Subordination to and Incorporation of Terms of the Lease.

         (1) This Sublease is in all respects subject and subordinate to all of
the terms, provisions, covenants, stipulations, conditions and agreements of the
Lease, and, except as otherwise expressly provided in this Sublease, all of the
terms, provisions, covenants, stipulations, conditions, rights, obligations,
remedies and agreements of the Lease (including but not limited to Article 14
(except for Section 14.3) of the Lease as to payment of Fixed Rent and
Additional Rent in accordance with the provisions hereof) are incorporated in
this Sublease by reference and made a part hereof as if herein set forth at
length, and shall, as between Sublessor and Sublessee (as if they were the
Landlord and Tenant, respectively, under the Lease, and the word "Lease" were
"Sublease" and the word "Premises" were "Subleased Premises"), constitute the
terms of this Sublease, except for Articles 2, 3, 4 and 5 (except Section 5.3),
Section 7.1, Article 9, Sections 14.2 (e), 14.3, 15.1, 16.1 and 16.3, Articles
17, 18, 19 and 20 and Sections 21.2, 21.6, 21.9 and 21.10, as well as such other
terms of the Lease as do not relate to the Subleased Premises or are
inapplicable to, inconsistent with, or specifically modified by, the terms of
this Sublease (which provisions, for purposes of this Sublease, are hereby
deemed deleted in their entirety). In furtherance of the foregoing, Sublessee
shall not take any action or do or permit to be done anything which (i) is or
may be prohibited to Sublessor, as tenant under the Lease, (ii) might result in
a violation of or default under any of the terms, covenants, conditions or
provisions of the Lease or any other instrument to which this Sublease is
subordinate, or (iii) would result in any additional cost or other liability to
Sublessor. This clause shall be self-operative and no further instrument of
subordination shall be required, but Sublessee shall execute promptly any
certificate confirming such subordination that Sublessor may request. In the
event of any inconsistency between this Sublease and the Lease, such
inconsistency shall be resolved in favor of that obligation which is more
onerous to Sublessee or that restriction which is more restrictive of Sublessee,
as the case may be.

         (2) In the event that the Lease is canceled or terminated, Sublessee
shall, at the option of Landlord, attorn to and recognize Landlord, as Sublessor
hereunder, and shall, promptly upon

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Landlord's request, execute and deliver all instruments necessary or appropriate
to confirm such attornment and recognition. Sublessee hereby waives all rights
under any present or future law to elect, by reason by the termination of the
Lease, to terminate this Sublease or surrender possession of the Subleased
Premises.

         8. Sublessee's Obligations.

         Except as specifically set forth herein to the contrary, all acts to be
performed by, and all of the terms, provisions, covenants, stipulations,
conditions, obligations and agreements to be observed by, Sublessor, as tenant
under the Lease, shall, to the extent that the same relate to the Subleased
Premises, be performed and observed by Sublessee, and Sublessee's obligations in
respect thereof shall run to Sublessor or Landlord, as Sublessor may determine
to be appropriate or as may be required by the respective interests of Sublessor
and Landlord. Notwithstanding the foregoing, nothing in this Article 8 shall be
deemed to expand the terms, provisions, covenants, stipulations, conditions,
obligations and agreements of Sublessee beyond those set forth in this Sublease
or in the Lease, as and to the extent incorporated herein, as modified hereby.
Sublessee shall indemnify, defend and hold Sublessor harmless from and against
all liabilities, losses, obligations, damages, penalties, claims, costs and
expenses (including, without limitation, attorneys' fees and other costs) which
are paid, suffered or incurred by Sublessor or claimed or asserted against
Sublessor as a result of the nonperformance or nonobservance of any such terms,
provisions, covenants, stipulations, conditions, obligations or agreements by
Sublessee hereunder.

         9. Sublessor's Obligations.

         Sublessor agrees that except as expressly provided herein, Sublessee
shall have and enjoy the same rights which Sublessor, as tenant under the Lease,
has to performance by Landlord of any service, repair, alteration or other
similar obligation which is the obligation of Landlord to perform under those
provisions of the Lease incorporated herein, provided, however, that
notwithstanding anything contained in this Sublease to the contrary, Sublessor
shall have no responsibility to Sublessee for, and shall not be required to
provide, any of the services or make any of the repairs or restorations which
Landlord has agreed to make or provide, or cause to be made or provided, under
the Lease (including, without limitation, Landlord's obligations set forth in
Article 5 of the Lease) and Sublessee shall rely upon, and look solely to,
Landlord for the provision of such services and the performance of such repairs
and restorations. Sublessor agrees to use reasonable efforts to cooperate in
assisting Sublessee to obtain such repairs from Landlord, if requested. In no
event shall Sublessor have any obligation to bring any action or proceeding or
to take any steps to enforce Sublessor's rights against Landlord. Sublessee
shall contact Sublessor's facility manager, Spaulding & Slye Colliers (or such
other person or entity as Sublessor shall from time to time identify as its
facility manager by notice to Sublessee), for all Building concerns such as
maintenance, janitorial, cafeteria, fitness center, parking, security and other
Building related issues. Sublessee shall not make any claim against Sublessor
for any

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damage which may result from, nor shall Sublessee's obligations hereunder
(including, without limitation, Sublessee's obligation to pay all Fixed Rent and
Additional Rent when due) be impaired by reason of (a) the failure of Landlord
to keep, observe or perform any of its obligations under the Lease, or (b) the
acts or omissions of Landlord or any of its agents, contractors, servants,
employees, invitees or licensees. If Landlord shall default in any of its
obligations to Sublessor with respect to the Subleased Premises, Sublessee shall
be entitled to request that Sublessor enforce Sublessor's rights against
Landlord with respect thereto, but Sublessor shall have no obligation to bring
any action or proceeding or to take any steps to enforce Sublessor's rights
against Landlord. In the event of such default and in the event that Sublessor
elects a remedy that entitles Sublessor to rent abatement and Sublessor receives
such abatement, then Sublessor agrees, to pass on to Sublessee a share of such
abatement to the extent it applies to the Subleased Premises.

         10. Covenants with Respect to the Lease.

         In the event that Sublessee shall be in default of any term, provision,
covenant, stipulation, condition, obligation or agreement of, or shall fail to
honor any obligation under, this Sublease, Sublessor, on giving the notice, if
any, required by the Lease (as modified pursuant to Section 15 hereof) and
subject to the right, if any, of Sublessee to cure any such default within any
applicable grace period provided in the Lease (as modified pursuant to Section
15 hereof), shall have available to it all of the remedies available to Landlord
under the Lease including without limitation Section 14.2 of the Lease (with the
words "Fixed Rent" substituted for "Base Rent" and "Additional Rent" substituted
for "Operating Costs") in the event of a default or failure on the part of the
Sublessor, as tenant thereunder. Such remedies shall be in addition to all other
remedies available to Sublessor at law or in equity.

         11. Brokers.

         Sublessor and Sublessee each represent and warrant to the other that
neither has dealt with any broker or finder in connection with this Sublease
other than Trammell Crow Company (the "Broker") and Sublessor and Sublessee each
agree to indemnify, defend and hold the other harmless from and against any and
all liabilities, losses, obligations, damages, penalties, claims, costs and
expenses (including, without limitation, attorneys' fees and other charges)
arising out of (i) any breach of the foregoing representation and/or (ii) any
claim, demand or proceeding for a real estate brokerage commission, finder's fee
or other compensation made by any person or entity other than the Brokers in
connection with this Sublease claiming to have dealt with the indemnifying party
and not such other party. If, as and when this Sublease is executed, and the
first month's Fixed Rent is paid, Sublessor shall pay the Broker 50% of the fee
and commission due them pursuant to a separate agreement, with the remaining 50%
to be paid by Sublessor upon occupancy of, and the commencement of payments of
Fixed Rent by Sublessee for, the Subleased Premises.

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         12. Indemnification of Sublessor.

         (1) Sublessee agrees to indemnify, defend and hold Sublessor harmless
from, any and all liabilities, losses, obligations, damages, penalties, claims,
costs and expenses (including, without limitation, attorneys' fees and other
charges) which are paid, suffered or incurred by Sublessor as a result (i) any
personal injuries or property damage occurring in, on or about the Subleased
Premises during the Term caused by Sublessee or Sublessee's agents, contractors,
servants, employees, invitees or licensees, (ii) any work or thing done, or any
condition created, by Sublessee or Sublessee's agents, contractors, servants,
employees, invitees or licensees in, on or about the Subleased Premises or the
Building during the Term, or (iii) any act or omission of Sublessee or
Sublessee's agents, contractors, servants, employees, invitees or licensees
during the Term except to the extent caused wholly by the negligence,
recklessness or intentional misconduct of Sublessor.

         (2) Sublessor agrees to indemnify, defend and hold Sublessee harmless
from, any and all liabilities, losses, obligations, damages, penalties, claims,
costs and expenses (including, without limitation, attorneys' fees and other
charges) which are paid, suffered or incurred by Sublessee as a result any
personal injuries or property damage occurring in, on or about the Subleased
Premises in connection with Sublessor's use of the telephone closets, as
described in Section 1(c) of this Sublease, during the Term or otherwise caused
by the acts or negligence of Sublessor or Sublessor's agents, contractors,
servants, employees, invitees or licensees during the Term, except to the extent
caused wholly by the negligence, recklessness or intentional misconduct of
Sublessee. La no event shall Sublessor be liable for any indirect, incidental,
special, punitive or consequential damages, including lost profit or revenues,
even if informed of their possibility.

         13. Termination of Lease.

         If the term of the Lease is terminated prior to the Expiration Date,
then, subject to Section 7(b) hereof, this Sublease shall immediately terminate
and Sublessor shall not be liable to Sublessee by reason thereof.

         14. Approvals or Consents.

         In all provisions of the Lease requiring the approval or consent of
Landlord, Sublessee shall be required to obtain the express written approval or
consent of Sublessor.

         15. Time Limits.

         The parties agree that unless otherwise expressly modified herein, the
time limits set forth in the Lease for the giving of notices, making demands,
payment of any sum, the performance of

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any act, condition or covenant, or the exercise of any right, remedy or option,
are modified for the purpose of this Sublease by (i) shortening the same in each
instance by three (3) business days if requiring performance by Sublessee, and
(ii) by lengthening the same in each instance by three (3) business days if
requiring performance by Sublessor, so that notices may be given, demands made,
any act, condition or covenant performed and any right or remedy hereunder
exercised, by Sublessor or Sublessee, as the case may be, within the time limits
relating thereto contained in the Lease. Sublessor and Sublessee shall, promptly
after receipt thereof, furnish to each other a copy of each notice, demand or
other communication received from Landlord with respect to the Subleased
Premises.

         16. Assignment and Subletting.

         (1) Sublessee shall not assign, sublet, mortgage, pledge or encumber
this Sublease, the Subleased Premises, or any interest in the whole or in any
portion thereof, without the prior written consent of Sublessor (which consent
shall not be unreasonably withheld or delayed). For purposes of this Article 16,
a transfer, in one transaction or a series of transactions, of a controlling
interest in the capital stock or other ownership or membership interests in
Sublessee shall be deemed to be an assignment of this Sublease. If Sublessee
makes any such assignment, mortgage, sublease or pledge (whether with or without
Sublessor's written consent), Sublessee named herein shall nonetheless remain
primarily liable for the performance and observation of all of the terms of this
Sublease required to be observed or performed by Sublessee hereunder. Fifty
percent (50%) of the amount by which any rentals, fees and charges from time to
time received by Sublessee in connection with any such assignment or sublease
(after first netting out any reasonable brokerage and re-letting expenses
actually incurred by Sublessee), exceed the Fixed Rent and Additional Rent
payable to Sublessor hereunder (hereinafter referred to as "Excess Rental")
shall be paid immediately by Sublessee to Sublessor as Additional Rent under
this Sublease. In such event, the Fixed Rent and Additional Rent payable by
Sublessee to Sublessor under this Sublease for the balance of the Sublease Term
shall be increased by an amount equal to the Excess Rental. In addition,
Sublessor shall have the option, in its sole discretion, to terminate this
Sublease effective as of the proposed effective date of any assignment or
sublease, by giving Sublessee written notice thereof within ten (10) days after
Sublessor's receipt of said notice from Sublessee; and in the event Sublessee
shall propose to sublet only a portion of the Subleased Premises, Sublessor
shall have the additional option to terminate this Sublease as to that portion
of the Subleased Premises, Sublessor shall have the additional option to
terminate this Sublease as to that portion of the Subleased Premises proposed to
be sublet. Should Sublessor not elect to so terminate this Sublease in
connection with any proposed subletting or assignment, Sublessor shall continue
to have the right to disapprove same (subject to the terms herein). Upon any
subletting or assignment by Sublessee in accordance with the terms hereof, any
extension option granted herein shall become null and void. Consent by Sublessor
to one or more assignments or sublettings shall not operate as a waiver of
Sublessor's rights as to any subsequent assignments or sublettings.

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         (2) If Sublessee should desire to assign this Sublease or sublet the
Subleased Premises (or any part thereof), Sublessee shall give Sublessor written
notice thirty (30) days in advance of the proposed effective date of any
proposed assignment or sublease, specifying (i) the name, current address, and
business of the proposed assignee or sublessee, (ii) the amount and location of
the space within the Subleased Premises proposed to be so subleased, (iii) the
proposed effective date and duration of the assignment or subletting, and (iv)
the proposed rent or consideration to be paid to Sublessee by such assignee or
sublessee. Sublessee shall promptly supply Sublessor with financial statements
and other information as Sublessor may reasonably request to evaluate the
proposed assignment or sublease. Sublessee agrees to reimburse Sublessor for
Sublessor's reasonable attorney's fees incurred.

         (3) Notwithstanding anything to the contrary in this Sublease,
Sublessee shall have the right, for which Sublessor's prior written consent
shall not be withheld or delayed, at any time, and from time to time to transfer
to any entity into or with which Sublessee is merged or consolidated, or to
which substantially all of Sublessee's assets are transferred, or to any
corporation that controls or is controlled by Sublessee, or is under common
control with Sublessee, provided in any of such events (a) the successor to
Sublessee has a net worth (computed in accordance with generally accepted
accounting principles) of at least $100,000,000, and (b) proof satisfactory to
Sublessor of such net worth shall have been delivered to Sublessor within five
(5) days after the effective date of any such transaction. This covenant and
assignment shall run with the land and shall bind Sublessee and Sublessee's
heirs, executors, administrators, personal, representatives, successors and
assigns.

         (4) If Sublessee assigns, sublets or makes any other transfer of all or
any portion of its interest(s) hereunder, Sublessee named in this Sublease shall
remain directly and primarily responsible for the faithful performance and
observance of all of the covenants and obligations on Sublessee's part to be
performed in this Sublease.

         (5) Any assignee or subtenant hereunder shall be bound by and shall
comply with all of the terms and provisions in this Sublease. As a condition to
the effectiveness of any assignment that is permitted hereunder, the assignee
shall, by an instrument in writing, within five (5) days after the effective
date of the applicable transaction assume and agree to perform (for the express
benefit of Sublessor) the terms hereof; and as a condition to the effectiveness
of any sublease that is permitted hereunder, the subtenant shall acknowledge in
writing (for the express benefit of Sublessor) within five (5) days after the
effective date of the applicable transaction the existence of this Sublease and
shall covenant not to do or permit to be done anything that would constitute a
breach thereof.

         (6) Notwithstanding anything contained in this Paragraph 16 to the
contrary, provided Sublessee is not in default hereunder, Sublessor shall not
unreasonably withhold or delay its consent to Sublessee's request to assign this
Sublease or to sublease the Subleased Premises. In

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determining the reasonableness of Sublessor's approval of or failure to consent
to Sublessee's assignment of this Sublease or the subleasing of the Subleased
Premises, Sublessor may take into consideration all relevant factors surrounding
the proposed sublease and assignment, including without limitation, the
following:

                  (1)      the business reputation of the proposed assignee or
                           subtenant and its partners, officers, directors and
                           stockholders;

                  (2)      the nature of the business and the proposed use of
                           the Subleased Premises by the proposed assignee or
                           subtenant;

                  (3)      the financial condition of the proposed assignee or
                           subtenant;

                  (4)      the effect that the proposed assignee or subtenant
                           would have on the operations and maintenance of the
                           Building;

                  (5)      whether or not the proposed assignee or subtenant is
                           presently a competitor (or subsidiary, affiliate or
                           parent of a competitor);

                  (6)      restrictions, if any, contained in other leases, or
                           agreements affecting the Building;

                  (7)      the extent to which the proposed subtenant or
                           assignee and Sublessee provide Sublessor with
                           assurances reasonably satisfactory to Sublessor as to
                           the satisfaction of Sublessee's obligations
                           hereunder, including the payment of rent;

                  (8)      restrictions, if any, imposed by the holder of any
                           mortgage encumbering the Building or any portion
                           thereof;

taking into account the fact that the Building is Sublessor's corporate
headquarters and that portions of the Subleased Premises are visible from
Building common areas, including the atrium, and from other premises occupied by
Sublessor and by other tenants.

         17. End of Term.

         Sublessee acknowledges that possession of the Subleased Premises must
be surrendered to Sublessor on the Expiration Date or earlier termination of
this Sublease (subject to the force majeure) in the same condition as set forth
in Section 5(b) hereof, subject to normal wear and tear or casualty. Sublessee
agrees to indemnify, defend and hold Sublessor harmless from, any and all
liabilities, losses, obligations, damages, penalties, claims, costs and expenses
(including,

                                      -11-
<PAGE>   12
without limitation, attorney's fees and other charges) which are paid, suffered
or incurred by Sublessor as a result of the failure of, or the delay by,
Sublessee in so surrendering the Subleased Premises, including, without
limitation, any claims made by Sublessor or any succeeding tenant founded on
such failure or delay.

         18. Destruction, Fire and other Casualty.

             [Intentionally Omitted]

         19. Eminent Domain.

         With respect to Section 11.2 of the Lease, in the event Sublessor
receives an award for relocation benefits and moving expenses Sublessee shall be
entitled to a share provided that (i) Sublessee advanced Sublessor its
proportionate share of the expenses incurred by Sublessor in connection with any
effort to obtain such an award and (ii) the condemnation or taking adversely
affects Sublessee.

         20. Notices.

         Any notice, request or demand ("Notice") permitted or required to be
given by the terms and provisions of this Sublease, or by any law or
governmental regulation, either by Sublessor or Sublessee, shall be in writing.
Unless otherwise required by law or regulation, all Notices shall be given and
shall be deemed to have been served and given by either of the parties hereto
and received by the other party, on the date when the party giving the Notice
shall have mailed the Notice by any nationally recognized overnight delivery
service (with signature required) or hand delivered the Notice (with signature
required), addressed to the other party at the address of the other party first
set forth above. A copy of all Notices sent (i) to Sublessor shall be sent to
the address set forth on the first page of this Sublease, Attention: General
Counsel and (ii) to Sublessee shall be sent to Michael S. Palin, Chief Financial
Officer at the address set forth in the preface of this Sublease, except that
prior to the Commencement Date, the address shall be 60 Hickory Drive, Waltham,
Massachusetts 02451. Either party hereto may designate a different address for
Notices to such party by serving Notice of such change in accordance with this
Section 19.

         21. Extension.

         Sublessor may, at its sole election, give notice to Sublessee at least
twelve (12) months prior to the Expiration Date, of Sublessor's good faith
determination that all or a substantial portion of the Subleased Premises is or
will be needed by Sublessor within the two (2) years following the Expiration
Date for actual occupancy by Sublessor or one or more of its affiliates. Unless
Sublessor shall give timely such notice, Sublessee shall have the option, by
notice to Sublessor at least nine (9) months prior to the Expiration Date, to
extend the Term of this

                                      -12-
<PAGE>   13
Sublease for one (1) period of two (2) years. If Sublessee fails to give timely
such notice of extension, Sublessee's extension option shall be conclusively
deemed waived and of no further force or effect time being of the essence, Said
extension option is further subject to the conditions that Sublessee shall not
then (x) have assigned this Sublease or sublet more than twenty-five (25%)
percent of the Subleased Premises or (y) be in default under this Sublease
beyond such grace or cure period, if any, as may be applicable to such default.
The rate of Fixed Rent payable by Sublessee during such two-year extension
period shall be the higher of (i) the Fixed Rent and Additional Rent payable
during the then current lease year immediately proceeding such two-year
extension period or (ii) Fixed Rent determined pursuant to the method for
determining "Base Rent" set forth in subsection (c) (but not subsection (d)) of
Section 2.3 of the Lease, except that "Extension Market Rate" shall mean the
fair market rental rate for the Subleased Premises in its then "as is" condition
for such two-year extension term, upon and otherwise upon and subject to the
other terms and provisions of this Sublease, with "Sublessor" substituted for
"Landlord" and "Sublessee" substituted for "Sublessee".

         22. Security Deposit.

         Sublessee shall deposit with Sublessor, as security for the faithful
performance and observance by Sublessee of the terms, conditions, covenants and
provisions of this Sublease, including the timely and proper surrender of
possession of the Subleased Premises the following security:

         (1) Sublessee shall deliver to Sublessor upon execution of this
Sublease a clean, irrevocable, non-documentary (other than the sight draft
referred to therein) and unconditional Letter of Credit (the "Letter of Credit")
in an amount equal to Four Hundred Thirty-Three Thousand Six Hundred Forty and
75/100 Dollars ($433,640.75) (the "Security Deposit" issued by and drawn upon
any commercial bank (hereinafter referred to as the "Issuing Bank") with offices
for banking purposes in the City of Boston or the greater Boston area and which
shall mean Silicon Valley Bank or any other bank, trust company, national
banking association or savings and loan association which (or the parent company
of which) have outstanding unsecured, uninsured and unguaranteed indebtedness
that is then rated, without regard to qualification of such rating by symbols as
"+" or "-" or numerical notation, "Aa" or better by Moody's Investors Service
and "AA" or better by Standard & Poor's Corporation, and has combined capital,
surplus and undivided profits of not less than $500,000,000.00, which Letter of
Credit shall have a term of not less than one year, be in form and content
satisfactory to Sublessor, be for the account of Sublessor and be fully
transferable by Sublessor without the payment of any fees or charges, it being
agreed that if any such fees or charges shall be so imposed, then such fees or
charges shall be paid by Sublessee. The Letter of Credit shall provide that it
shall be deemed automatically renewed, without amendment, for consecutive
periods of one year each thereafter during the term of this Sublease, unless the
Issuing Bank sends notice (the "Non-Renewal Notice") to Sublessor by certified
mail, return receipt requested, not less than

                                      -13-
<PAGE>   14
thirty (30) days next preceding the then expiration date of the Letter of Credit
that it elects not to have such Letter of Credit renewed. Additionally, the
Letter of Credit shall provide that Sublessor shall have the right, exercisable
within twenty (20) days of its receipt of the Non-Renewal Notice, by sight draft
on the Issuing Bank to receive the monies represented by the existing Letter of
Credit and to hold such proceeds pursuant to the terms of this Paragraph 21 as a
cash security pending the replacement of such Letter of Credit. In the event
that Sublessee defaults in respect of any of the terms, provisions, covenants or
conditions of this Sublease, including, but not limited to, the payment of Fixed
Rent and Additional Rent, applicable after any notice and beyond the expiration
of any applicable grace period, Sublessor may notify the Issuing Bank and
thereupon receive all the monies represented by the Letter of Credit and use,
apply or retain the whole or any part of such proceeds, to the extent required
for the payment of any Fixed Rent or Additional Rent or any other sum as to
which Sublessee is in default or for any sum which Sublessor may expend or may
be required to expend by reason of Sublessee's default in respect of any of the
terms, provisions, covenants or conditions of this Sublease, including, but not
limited to, any damages or deficiency in the reletting of the Subleased
Premises, whether such damages or deficiency accrue or accrues before or after
summary proceedings or other reentry by Sublessor. If Sublessor applies or
retains any part of the proceeds of the Letter of Credit, Sublessee, upon
demand, shall deposit with Sublessor the amount so applied or retained so that
Sublessor shall have the full deposit on hand at all times during the Term. If
Sublessee shall surrender the Subleased Premises to Sublessor in accordance with
this Sublease and shall pay all Fixed Rent and Additional Rent due hereunder in
full through and including the Expiration Date of this Sublease and no other
default shall have occurred and be continuing, the Letter of Credit shall be
returned to Sublessee within twenty (20) days after the Expiration Date and
delivery of the entire possession of the Subleased Premises to Sublessor.
Sublessee expressly agrees that Sublessee shall have no right to apply any
portion of the Security Deposit against any Sublessee's obligations to pay Fixed
Rent or Additional Rent hereunder and, if Sublessee shall seek to so apply such
Security Deposit, Sublessee shall pay liquidated damages to Sublessor in a sum
equal to two (2) times the amount of any such unpaid Fixed Rent or Additional
Rent. In the event of a transfer or assignment of the Sublease, within thirty
(30) days of notice of such transaction, Sublessor at its sole cost and expense,
shall arrange (i) for the transfer of the Letter of Credit to the new
sublandlord as designated by Sublessor in such notice or (ii) to have the Letter
of Credit reissued in the name of the new sublandlord; and Sublessor shall
thereupon be released by Sublessee from all liability for the return of such
security. Sublessee shall look solely to the new sublandlord for the return of
such Letter of Credit and the provisions hereof shall apply to every transfer or
assignment made of the security to a new sublandlord. Sublessee further
covenants and agrees that it shall not assign or encumber or attempt to assign
or encumber the Letter of Credit deposited herein as security and that neither
Sublessor nor its successors or assigns shall be bound by any such assignment,
encumbrance, attempted assignment or attempted encumbrance.

         (2) Notwithstanding anything to the contrary contained in this
Sublease, provided that no default, beyond any applicable notice and grace
period, shall have occurred and be continuing

                                      -14-
<PAGE>   15
as of any Reduction Date, then the Security Deposit shall be reduced over the
Term as follows: (i) upon the first (1st) anniversary of the Commencement Date,
the Security Deposit shall be reduced to an amount equal to Two Hundred
Eight-Nine Thousand Ninety-Three and 83/100 Dollars ($289,093.83); (ii) upon the
second (2nd) anniversary of the Commencement Date, the Security Deposit shall be
reduced, and shall remain for the balance of the Term at, to an amount equal to
One Hundred Forty-Four Thousand Five Hundred Forty-Six and 92/100 Dollars
($144,546.92) (each of the anniversary dates provided for in (i) and (ii) above
is individually a "Reduction Date" and collectively, the "Reduction Dates"). In
connection with such reduction, provided that Sublessee shall tender to
Sublessor a replacement or amended Letter of Credit in the appropriately reduced
amount of the Security Deposit, Sublessor shall promptly exchange the Letter of
Credit then held by Sublessor for the Letter of Credit tendered by Sublessee in
the reduced amount set forth above. In the alternative, and provided that no
default, beyond any applicable notice and grace period, shall have occurred and
be continuing as of any Reduction Date, Sublessor shall, within ten (10)
business days following request from Sublessee furnish to the Issuing Bank a
letter signed by Sublessor acknowledging that no default by Sublessee has
occurred and is continuing beyond applicable notice and grace, and agreeing to
such reduction of the Security Deposit as provided above.

         23. Other Sublessee Rights.

         Sublessee shall have the right to use, on a non-reserved basis, a
maximum of 85 of the parking spaces made available to Sublessor pursuant to
Section 4.4 of the Lease on Levels 3, 4 and 5 of the Parking Facility. Sublessor
reserves the right to regulate and control such parking usage by Sublessee its
employees, licensees and invitees with parking stickers, tags, cards or any
other reasonable procedure. Sublessee shall participate and cooperate in such
control procedure and agrees that in the event of excess parking by Sublessee,
its employees, licensees or invitees, any of the offending vehicles or other
Sublessee vehicles may be denied parking privileges and/or towed at Sublessee's
expense and Sublessee may be subjected to a fine or penalty of $250.00 per
vehicle, which tow charges and fines or penalties shall be payable as Additional
Rent on each occasion. Sublessor shall attempt in good faith, but shall have no
obligation, to contact Sublessee prior to towing any offending vehicle. If
during any twelve month period Sublessor shall give written notice of such
excess parking on three or more occasions, any further such excess parking
during such twelve month period shall, at Sublessor's election, be deemed to
constitute a material incurable default under this Sublease. Sublessee shall
have the right to Building standard signage in the interior lobby of the
Subleased Premises and to representative inclusion in the Building lobby
directory, except that the provisions of Article 19, other than subsections (b),
(j) and (l) shall be applicable to Sublessee's lobby signage as if such signage
were "Tenant Building Signage", Sublessor were "Landlord" and Sublessee were
"Tenant" thereunder. Sublessor agrees to provide Building standard directional
signage to the Subleased Premises in the second floor and P-2 ground level
elevator lobbies and that its consent shall not be unreasonably withheld for
tenant signage at the entrance to the Subleased Premises.

                                      -15-
<PAGE>   16
Employees of Sublessee shall have the right to use the cafeteria, as well as the
fitness center in the Building from time to time maintained by Sublessor,
subject to such rules and regulations and, in the case of the fitness center the
payment of such per-employee annual fee, as Sublessor may reasonably establish
from time to time.

         24. Electricity Charge.

         Sublessee shall pay monthly, as Additional Rent, as and when payments
of Fixed Rent are due, an electricity charge equal to the sum of Two Thousand
One Hundred Fifty-Seven and 42/100 Dollars ($2,157.42) in respect of Sublessor's
costs of providing electricity to the Subleased Premises. Sublessee's use of
electricity within or serving its uses of the Subleased Premises shall not
exceed that reasonably required for normal office use. If Sublessor at any time
reasonably determines that Sublessee's use of electricity exceeds reasonable
requirements for normal office use, and Sublessor elects to permit such excess
usage, Sublessor may, at Sublessee's expense, submeter such space and the
electricity charge payable monthly by Sublessee shall be increased to such
amount as Sublessor from time to time reasonably estimates based upon such
submetering and specifies by notice to Sublessee, with periodic adjustments, not
less frequently than annually, as Sublessee's actual usages are known. In no
event shall Sublessee be obligated to pay more than the actual cost of such
electricity as reasonably determined by Sublessor.

         25. Sublessee's Insurance.

         (1) Sublessee shall obtain and keep in full force and effect during the
term of this Sublease:

                  (1)      a policy of commercial general public liability
                           insurance, on a primary and non-contributory basis,
                           including bodily injury and property damage, with a
                           broad form contractual liability endorsement or the
                           then equivalent of such coverage, protecting
                           Sublessee, Sublessor, Sublessor's employees and
                           agents and any other parties designated by Sublessor
                           having an interest in the Subleased Premises, as
                           additional insureds, on an occurrence basis against
                           claims for personal injury, death and/or property
                           damage occurring in or about the Subleased Premises,
                           and under which the insurer agrees to indemnify,
                           defend and hold Sublessee harmless from and against,
                           among other things, all cost, expense and/or
                           liability arising our of or based upon any and all
                           claims, accidents, injuries and damages for which
                           Sublessee shall be liable in accordance with this
                           Sublease and the Lease, with any umbrella and primary
                           commercial general liability policy on a coterminous
                           basis. The minimum limits for liability shall be a
                           combined single limit with respect to each occurrence
                           in an amount of not less than

                                      -16-
<PAGE>   17
                           $5,000,000 for injury (or death) and damage to
                           property (or in any increased amount reasonably
                           required by Sublessor); and

                  (2)      insurance against loss or damage by fire, and such
                           other risks and hazards (including burglary, theft,
                           vandalism, sprinkler leakage damage, breakage of
                           glass within the Subleased Premises as are insurable
                           under then available standard forms of "all risk"
                           insurance policies, to Sublessee's personal property
                           and Sublessee's alterations for the full replacement
                           cost value thereof (including an "agreed amount"
                           endorsement having a deductible amount, if any, as
                           shall be determined by Sublessee in the exercise of
                           Sublessee's commercially reasonable discretion);

                  (3)      during the performance of any alteration, until
                           completion hereof, builder's risk insurance, with no
                           restrictions on coverage on an "all risk" basis and
                           on a completed value form for full replacement value
                           covering the interests of Sublessor and Sublessee,
                           with Sublessor as a named insured; and

                  (4)      worker's compensation insurance as required by law,
                           with express wavier of subrogation for the benefit of
                           Sublessor.

         (2) Prior to the time such insurance is first required to be carried by
Sublessee and thereafter, at least thirty (30) days prior to the expiration of
any such policies, Sublessee agrees to deliver to Sublessor evidence of payment
for the policies together with certificates evidencing such insurance. All such
certificates shall contain endorsements that (a) such insurance may not be
modified or canceled or allowed to lapse except upon thirty (30) days' written
notice to Sublessor by certified mail, return receipt requested, containing the
policy number and the names of the insured and the certificate holder, and (b)
Sublessee shall be solely responsible for payment of all premiums under such
policies and Sublessor shall have no obligation for the payment thereof
notwithstanding that Sublessor is or may be named as an insured. Sublessee's
failure to provide and keep in force the aforementioned insurance shall be
regarded as a material default hereunder, entitling Sublessor to exercise any or
all of the remedies as provided in this Sublease in the event of Sublessee's
default. All insurance required to be carried by Sublessee pursuant to the terms
of this Sublease shall be effected under valid and enforceable policies issued
by reputable and independent insurers permitted to do business in The
Commonwealth of Massachusetts and rated in Best's Insurance Guide, or any
successor thereto (of if there be none, an organization having a national
reputation) as having a general policy-holder rating of "A" and a financial
rating of at least "XIII". Sublessee shall not carry separate or additional
insurance, concurrent in form or contributing, in the event of any loss or
damage, with any insurance required to be obtained by Sublessee under this
Sublease.

                                      -17-
<PAGE>   18
         (3) Sublessee shall procure an appropriate clause in, or endorsement
on, any such "all risk" or fire or extended coverage insurance covering the
Subleased Premises, the personal property, fixtures or equipment located thereon
or therein, pursuant to which the insurance company waives subrogation or
consents to a wavier of right of recovery by the insured prior to any loss. It
is expressly understood and agreed that Sublessor will not be obligated to carry
insurance on Sublessee's property or Sublessee's work or insurance against
interruption of Sublessee's business.

         (4) Sublessee hereby releases Sublessor (its servants, agents,
employees and invitees) with respect to any claim (including a claim for
negligence) which Sublessee might otherwise have against Sublessor for loss,
damage or destruction with respect to its property by fire or casualty
(including rental value or business interruption, as the case may be) occurring
during the term of this Sublease.

         26. Governing Law.

         The provisions of this Sublease shall be governed and interpreted in
accordance with the laws of The Commonwealth of Massachusetts.

         27. Miscellaneous.

         (1) This Sublease may not be modified, amended, extended, renewed,
terminated or otherwise modified by either Sublessor or Sublessee except by a
written instrument signed by both of the parties hereto.

         (2) It is acknowledged and agreed that all understandings and
agreements heretofore had between the parties hereto are merged in this
Sublease, which alone fully and completely expresses their agreement with
respect to the subject matter hereof. This Sublease has been executed and
delivered after full investigation by each of the parties hereto, and neither
party hereto has relied upon any statement, representation or warranty which is
not specifically set forth in this Sublease.

         (3) This Sublease does not constitute an offer to sublease the
Subleased Premises to Sublessee and Sublessee shall have not rights with respect
to the leasing of the Subleased Premises unless and until Sublessor, in its sole
and absolute discretion, elects to be bound hereby executing and unconditionally
delivering to Sublessee an original counterpart hereof.

         (4) With respect to Section 16.3 of the Lease, Sublessor agrees to
provide Sublessee with copies of any environmental reports or assessments
concerning the Subleased Premises that are provided to Sublessor by Landlord.

                                      -18-
<PAGE>   19
         IN WITNESS WHEREOF, this Sublease has been duly executed as of the day
and year first above written.

                          SUBLESSOR:

                          RENAISSANCE WORLDWIDE, INC.

                          By:  /s/ Ronan O'Brien
                               ---------------------------------
                               Name:  Ronan O'Brien
                               Title:  Corporate Counsel

                          SUBLESSEE:

                          SITARA NETWORKS, INC.

                          By:  /s/ Michael S. Palin
                               ---------------------------------
                               Name:  Michael S. Palin
                               Title:  Chief Financial Officer

                                      -19-<PAGE>   1
                                                                    EXHIBIT 10.9

                                  [PLEXUS LOGO]
                  Comprehensive Professional Services Agreement

This Agreement is hereby entered into on this 19th day of July, 2000 by and
between Sitara Networks, Inc., of 60 Hickory Drive, Waltham, MA 02451
(hereinafter "Customer") and Plexus Corp. of 55 Jewelers Park Drive, Neenah, WI
54956, (along with its wholly-owned subsidiaries Plexus Technology Group, Plexus
Electronic Assembly, and SeaMED, a Plexus Company hereafter collectively
referred to as "Plexus".)

A. PRODUCT DEVELOPMENT AND PROTOTYPE PHASE INCLUSIVE (Prototype Phase inclusive)
The terms and conditions set forth in this Section A, Product Development and
Prototype Phase, as well as the terms and conditions set forth in Section C,
Standard Terms and Conditions, shall be applicable to this portion of the
Agreement.

         1. PROGRAM
         Plexus will undertake for the Customer a Program which could also
         include a prototype program, defined in the accompanying Proposal which
         this Agreement is part of. The activity described in the accompanying
         Proposal will be referred to as the "Program". Prototype program, if
         applicable, will be defined at the time the program is defined in
         writing by the Customer.

                  a)       At the Customers request, Plexus will provide a
                           bi-monthly or as agreed upon by both parties,
                           detailed engineering report showing progress of the
                           agreed to Program and schedule.

                  b)       From time to time, Plexus and the customer may
                           redefine, revise, enlarge, amend, abandon, or
                           undertake a new phase of activity as an addition to
                           the Program. These revisions to the Program shall be
                           defined in writing and agreed upon by both parties.
                           Any additional cost associated with the revisions
                           shall be quoted by Plexus and authorized by the
                           Customer before work can proceed on them. Except for
                           appropriate changes in objectives, schedules and
                           budgets, all additional work shall be conducted under
                           the terms of this Agreement.

                  c)       Unit cost estimates provided in this Proposal or
                           during the course of the Product Development Phase
                           are not binding and are for informal use only.

                  d)       Sections B.1. and B.2.h) also apply to prototype
                           programs.

         2. DRAWINGS, RECORDS AND MODELS
         At this time, Plexus will develop all records, sketches, original
         drawings, photographs, prototypes, or finished models and the use
         thereof are the exclusive property of the Customer. Normally any such
         items, which are of continuing value to the Customer, are returned to
         the Customer. In order to avoid questions regarding value, the customer
         will issue written instructions to Plexus within sixty (60) days
         following termination or completion of the Product Development Phase
         for the disposition all such items. Plexus is authorized to determine
         the disposition of any such items, which are not covered by written
         instructions.

         At the completion of the Product Development Phase, the customer will
         receive hard copies and/or magnetic medium of the files generated as a
         result of the Product Development and Prototype Phase. These
         deliverables are described in the Proposal. Customer will be
         responsible for maintaining and archiving the deliverables in a
         suitable environment.

         3. COMMITMENT TO MANUFACTURE
         Customer understands that Plexus desires to manufacture the product at
         the end of the program. Customer understands that manufacturing of the
         product by a competitor of Plexus is undesirable to Plexus. Should
         Customer manufacture the product outside Customer's facilities,
         Customer will work with Plexus in good faith to ensure that Plexus is
         awarded the manufacture of the product, provided Plexus is cost
         competitive and capabilities analysis is proven.

Sitara Networks-Final Execution Comprehensive Professional Services Agreement
<PAGE>   2
         4. PROTOTYPE UNITS
         Engineering and Pre-production Prototypes: During the Product
         Development and Prototype Phase, Plexus may generate several versions
         of the unit to verify design concepts. The number of prototypes and/or
         pre-production units that Plexus will deliver to the Customer is
         outlined in the body of the proposal. These prototypes may or may not
         meet the requirements of the product specification. Once these units
         are built, any modifications (hardware, software, or mechanical)
         required as a result of further testing will be done by Plexus on a
         time and material basis.

         5. ON-GOING SUPPORT
         At the conclusion of the Product Development and Prototype Phase of the
         Program, Plexus and the Customer will jointly review the entire Program
         to assure compliance with the Program Specifications. When this has
         been completed, Plexus will notify the Customer in writing that this
         Phase has been completed, and the Customer will have thirty (30) days
         to respond by identifying errors or omissions they believe should be
         corrected by Plexus under this Agreement. After that period, the
         Customer requests for on-going support will be handled on a time and
         materials basis at Plexus' then current billing rates.

         6. COMPENSATION, CHARGES, AND BILLING

                  a)       Unless other specific arrangements are agreed upon,
                           Plexus will invoice the Customer each month for
                           services rendered up to the total amount specified in
                           the Proposal. Invoices are subject to terms of net
                           amount due in thirty (30) days following the date of
                           the invoice.

                  b)       Unless specifically stated to the contrary in the
                           Proposal, the following parts and/or services are not
                           included in the base Proposal and may be an
                           additional billing monthly as costs are incurred as
                           stated in Customer authorized quotation.

                                    1. Parts, PCBs and freight which may be
                                    required for project, breadboard and/or
                                    prototypes, plus actual cost plus defined
                                    mark-up.
                                    2. Tooling charges for custom components
                                    such as graphics, plastics, metal, etc. -
                                    actual cost plus defined mark-up.
                                    3. Telephone, fax, and travel expenses
                                    incurred by Plexus in pursuing the
                                    customer's objectives and directives -
                                    actual cost.
                                    4. Any travel required by Plexus in pursuing
                                    the Customer's objectives and directives
                                    will be billed at the normal hourly rate of
                                    the personnel performing the work for the
                                    Customer, with a maximum day billing of 8
                                    hours plus any expenses incurred.
                                    5. Services of consultants or other outside
                                    personnel retained by Plexus will be
                                    invoiced to the customer at a rate
                                    commensurate with Plexus' in-house rates or
                                    actual cost plus defined mark-up.
                                    6. NRE and Tooling: Markup percentage on NRE
                                    is 10%. Plexus will make reasonable efforts
                                    to minimize tooling and NRE charges
                                    including competitive quoting. Customer has
                                    the right to review NRE and tooling quotes.
                                    Customer has the right to alternatively
                                    source NRE materials if NRE pricing cannot
                                    be mutually agreed upon between the parties.

         7. PRODUCT DEVELOPMENT CANCELLATION
         During the Product Development and Prototype Phase, Customer may cancel
         this project upon providing forty-five (45) days written notice to
         Plexus. In such an event, the Customer shall be responsible for all
         expenses incurred through the effective date of cancellation,
         including, but not limited to, all labor undertaken and all materials
         purchased or ordered prior to said effective date. To help minimize the
         impact of cancellation charges, Plexus will attempt to restock
         components at the supplier, resell the components, and/or utilize the
         components on non-customer assemblies.

         8. ADVANCED PROCUREMENT OF COMPONENTS/TOOLING
         Plexus may, with customer prior approval on dollar value exceeding $500
         procure for assemblies for either Prototype or Risk Reduction any items
         that requires Customer to meet ship date requirements. Any deviation
         from the Supplied Approved Vendor List "AVL" (or franchised
         distributor) requires Customer prior approval.

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B. MANUFACTURING PHASE
The terms and conditions set forth in this Section B, Manufacturing Phase,
Section A, Product Development Phase, as well as the terms and conditions set
forth in Section C, Standard Terms and Conditions, shall be applicable to this
portion of the Agreement.

         1. DEFINITIONS
         For the purpose of this Manufacturing Phase:

         "Long Lead Time Component(s)" shall mean all of those individual parts
         and materials whose current lead times extend beyond forty (40)
         business days. The Long Lead Time Components may, from time to time, be
         reviewed by Plexus and Customer, at the request of either party due to
         possible changes in market conditions of supply and demand affecting
         the procurement by Plexus of the Components and/or Long Lead Time
         Components for the assemblies hereunder. Any changes resulting from
         such review shall be with the mutual written agreement of Plexus and
         Customer.

         "NCNR Component(s)" shall mean those parts that are not cancelable once
         placed on order with Plexus suppliers, and are not returnable once
         delivered to Plexus. The NCNR Component(s) may, from time to time, be
         reviewed by Plexus and Customer, at the request of either party due to
         possible changes in market conditions of supply and demand affecting
         the procurement by Plexus of the Components and/or NCNR Component(s)
         for the assemblies hereunder. Any changes resulting from such review
         shall be with the mutual written agreement of Plexus and Customer.

         "Special Component(s)" shall mean those parts that have special
         procurement conditions such as limited change parameters or other
         special liability conditions that are required by Plexus' suppliers.
         The Special Component(s) may, from time to time, be reviewed by Plexus
         and Customer, at the request of either party due to possible changes in
         market conditions of supply and demand affecting the procurement by
         Plexus of the Components and/or Special Component(s) for the assemblies
         hereunder. Any changes resulting from such review shall be with the
         mutual written agreement of Plexus and Customer.

         "Monthly Rolling Quantity Forecast of Delivery Requirements" shall mean
         the written documents provided to Plexus by Customer each month
         indicating the delivery requirements projected for the next twelve (12)
         months.

         "Obsolete Components" shall mean all material used in Buyer's product
         for which there is no current or future demand.

         "Inactive Components" shall be all material which is non-obsolete
         material with a balance that is greater than zero after all demand has
         been met.

         "Excess Components" shall be all material with a balance that is
         greater than zero after six (6) months that will be consumed by demand
         beyond six (6) months.

         2. AUTHORIZATION OF WORK PROCUREMENT OF MATERIALS
         The following terms will apply:

                  a)       The purpose of this section is to define the methods
                           under which Plexus will procure materials to support
                           manufacturing of product for the Customer. The intent
                           is to provide the Customer with flexibility to alter
                           and/or cancel schedules within a reasonable period of
                           time while at the same time minimizing Plexus
                           liability that is a result of those alterations and
                           cancellations. In order to offer the best possible
                           price, Plexus does not attempt to build unanticipated
                           carrying charges into its price. When changes in
                           Customer requirements occur that cause Plexus to
                           incur unanticipated expenses that are the result of
                           Customer actions, the Customer is expected to
                           reimburse Plexus for the costs incurred.

                  b)       For each assembly and/or board level to be
                           manufactured, Plexus establishes a manufacturing lead
                           time, which is the number of business days it will
                           take, an average, to receive and kit all

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                           components, assemble, test and ship the lot, unless
                           moved to Finished Goods Inventory ("FGI"). Unless
                           otherwise noted, this manufacturing lead-time is
                           twenty (20) business days. Plexus agrees to review
                           the manufacturing lead-time after three (3) months of
                           production of the product, and thereafter mutually
                           agree to any adjusted manufacturing lead-time. Plexus
                           schedules all components for a particular lot of
                           assemblies to arrive one manufacturing lead-time
                           prior to the Customer due date. Plexus then uses this
                           information, together with the Forecast and Purchase
                           Order information as defined below, to place
                           commitments to its suppliers for materials.

                  c)       At the beginning of each month, Customer will provide
                           a twelve (12) month rolling forecast of total
                           requirements listing top level assembly and/or board
                           level assembly requirements by month. This monthly
                           rolling forecast shall be used by Plexus to determine
                           the Components and/or the Long Lead Time Components,
                           NCNR Components and/or Special Components that Plexus
                           must obtain and/or procure and/or inventory, and
                           unless otherwise agreed to, Plexus will negotiate
                           pricing contracts with its suppliers based upon the
                           forecast.

                  d)       For purposes herein current month shall mean a
                           rolling four (4) week window. Changes from the
                           previous month's Purchase Orders are allowed to the
                           current Purchase Orders as follows:

                           i) Current Month:               No change allowed.
                           ii) Second Month:               Up to 50% reduction
                                                           or increase.
                           iii) Third Month:               Up to 75% reduction
                                                           or increase.
                           iv) Fourth Month (and beyond)   As required;
                                                           increase or decrease.

                           Changes in excess of these parameters may be mutually
                           agreed to by Plexus and Customer.

                           Changes to the monthly rolling Forecast may result in
                           an excess inventory position (due to component market
                           conditions), the impact for which is not considered
                           in the original cost of the assembly. In addition,
                           Plexus may have to place orders for quantities of
                           components in excess of that required to support
                           Customer requirements. This may be as a result of
                           minimum order size requirements or standard package
                           sizes from the supplier. In the event that the
                           monthly rolling Forecast does not define component
                           consumption of sufficient magnitude to eliminate the
                           excess inventory within sixty (60) business days,
                           Plexus will notify Customer of its excess inventory
                           position of Components and/or Long Lead Time
                           Components, NCNR Components and/or Special Components
                           that Plexus has procured and is inventorying and/or
                           has on order with its suppliers. Upon receipt of such
                           notification, Customer will purchase the excess
                           inventory at Plexus' actual cost plus the agreed upon
                           quoted material mark-up. Payment terms are net thirty
                           (30) days.

                  e)       At the end of each quarter, Customer will issue
                           Purchase Orders ("POs") for top level and/or board
                           level assemblies in accordance with, but not limited
                           to the monthly rolling Forecast of total
                           requirements. These POs will cover the next quarter's
                           total requirements. The pricing for that quarter's
                           POs will be reviewed for cost reductions the last
                           month of the prior quarter. There is a targeted price
                           reduction at a minimum of every other quarter. If
                           Plexus reduces cost, they keep 50/50% - if Customer
                           reduces cost it is all passed along to the Customer.

                  f)       Plexus shall procure in advance of Customer POs for
                           assemblies pursuant to the monthly rolling Forecast
                           for each top level and board level assembly, the
                           Components and/or Long Lead Time Components, NCNR
                           Components and/or Special Components, as required for
                           each top level and board level assembly. Plexus shall
                           purchase all components in accordance with Customer's
                           approved vendor list (AVL), exclusively. Any
                           deviation from the AVL must be authorized in writing
                           by Customer prior to purchase by Plexus.

                  g)       Customer may request that Plexus purchase from
                           Customer certain components that the Customer has in
                           its inventory as a result of the transfer of new
                           business to Plexus. Plexus and Customer will
                           negotiate in good faith to determine pricing and
                           title transfer of such inventory. In addition, open
                           component purchase order(s) with Customer's suppliers
                           may be transferred to Plexus upon mutual agreement.

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                  h)       Customer will communicate a monthly Production
                           Schedule to Plexus outlining the top level assembly
                           and/or board level production requirements. The
                           Production Schedule will be firmed for the current
                           month fifteen (15) business days prior to the start
                           of that month, will be within Forecasted quantities,
                           and have a six (6) month rolling horizon. Changes to
                           the Production Schedule are allowed as follows:

                           (1) Current Month:              No change Allowed.
                           (2) Second Month:               Up to 50% reduction.
                           (3) Third Month:                Up to 75% reduction.
                           (4) Fourth Month (and beyond)   As required; increase
                                                           or decrease.

                           Changes to the Production Schedule within the current
                           month may be mutually agreed to by Plexus and
                           Customer.

                           i)       At any time during the current month,
                                    Customer may exercise an increase or
                                    decrease in delivery requirements
                                    (Flexibility Quantity). This Flexibility
                                    Quantity is limited to a maximum
                                    accumulation of the Flexibility Percentage
                                    outlined in Attachment A (to be defined) for
                                    each top level and board level assembly, for
                                    the current month's production based on the
                                    average of the current sixty (60) business
                                    days of the Forecast. This Flexibility
                                    Quantity will be available within ten (10)
                                    business days of the Customer request.
                                    Additional Flexibility Quantity may be
                                    mutually agreed to between Plexus and
                                    Customer Any finished goods inventory (FGI)
                                    at the end of the current month will be
                                    netted from the Forecast in accordance with
                                    the change provisions of this Agreement.
                                    Customer understands and agrees that there
                                    may be associated costs with the efforts
                                    regarding this section and imposed by
                                    Plexus, which shall be borne by the
                                    Customer.

                           ii)      For Production Schedule decreases issued
                                    within the current month beyond the
                                    allowable Flexibility Quantity decrease, the
                                    Customer will pay full price and accept
                                    title and risk of loss for completed
                                    assemblies and any work in process materials
                                    and labor.

                                    (1)      Accept shipment of the completed
                                             assemblies within the current month
                                             as originally scheduled; or
                                    (2)      Pay full price and accept title and
                                             risk of loss for completed
                                             assemblies any work in process
                                             materials and labor.

                           iii)     For Production Schedule decreases issued
                                    outside the current month and beyond the
                                    allowable Production Schedule decrease
                                    parameters, the Customer will:

                                    (1)      Pay for and accept title and risk
                                             of Loss for the value of the
                                             components (cost plus the agreed
                                             upon quoted material markup) which
                                             Plexus is unable to return or
                                             reschedule to meet the new schedule
                                             requirements; and
                                    (2)      Pay Plexus for any additional cost
                                             from supplies resulting from the
                                             prescheduling.

                           iv)      For Production Schedule increases beyond the
                                    allowable Flexibility Quantity, Plexus will
                                    make its best effort to obtain the
                                    components necessary to meet Customer
                                    requirements. However, Plexus may be
                                    unsuccessful in obtaining all of the
                                    components required to meet the Customer's
                                    increased requirements at which Plexus will
                                    provide satisfactory evidence to Customer of
                                    such inability to meet such requirements. In
                                    that situation, Plexus reserves the right to
                                    Customer payment of the value of all
                                    inventory in house as of the delivery date
                                    that is a result of the increased
                                    requirement, which will be agreed upon by
                                    Plexus and Customer.

                  i)       Engineering Change

                           The term "Engineering Change(s)" (hereinafter called
                           "EC" or "EC's") shall mean those mechanical,
                           software, or electrical design and/or specification
                           and requirement changes which, if made to the
                           assemblies to be delivered hereunder, would affect
                           the schedule performance,

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                           reliability, availability, serviceability,
                           appearance, dimensions, tolerance, safety or purchase
                           price of such assemblies or which would require
                           additional approval test.

                               Plexus may determine that Engineering Changes
                               will affect its ability to maintain the delivery
                               schedule, due to the lead time of newly specified
                               parts and/or the impact of substantial rework or
                               modification. Under these circumstances, Plexus
                               reserves the right to define a new Production
                               Schedule for delivery and treat this as a
                               Production Schedule Change, with the Customer
                               liability as defined under Section 2 (g)
                               (ii)(iii) and (iv) above.

                               Upon receipt, Plexus shall review Customer's
                               proposed EC and Plexus shall give to Customer a
                               written evaluation of the EC, stating Plexus'
                               cost to implement the EC (including the cost to
                               modify any tooling), the excess quantity of
                               Components (including Long Lead Time Components,
                               NCNR Components and/or Special Components) Plexus
                               has inventoried and/or has on order with its
                               suppliers that are excess due to the EC, and
                               associated costs and expenses such Components
                               and/or Long Lead Time Components, NCNR Components
                               and/or Special Components that Customer shall be
                               liable for and the cost savings, if any,
                               resulting from the EC, and the expected effect on
                               the Production Schedule, availability and/or
                               purchase price of such assemblies, or which may
                               require additional approval tests by Customer.
                               Plexus will submit its written evaluation to the
                               Customer within five (5) business days after
                               receipt of the proposed EC, or in conjunction
                               with Customer's stated timeframe.

                  j)       Customer Supplied Parts
                           The Customer may provide certain components required
                           to build Customer's assemblies. The Customers
                           inability to provide parts in a timely manner may
                           effect Plexus' ability to meet its delivery schedule
                           and may cause Plexus to incur extraordinary expenses
                           to hold Plexus purchased material and/or labor in
                           process. Under these circumstances, Plexus reserves
                           the right to define a new Production Schedule for
                           delivery based upon component availability
                           information from the Customer and treat this as a
                           Production Schedule change, with the Customer
                           liability as defined under Section 2 (g) (ii)(iii)
                           and (iv) above.

                  k)       Minimum Component Purchases
                           Plexus may have to place order for quantities of
                           components in excess of that required to support
                           Customer requirements. This may be as a result of
                           minimum order size requirements or standard package
                           sizes from the supplier. The customer will agree to
                           have the cost of the excess components amortized over
                           a maximum of six (6) month's requirements, or will
                           place a purchase order separately for the excess
                           components.

                  1)       Obsolete, Inactive and Excess Inventory coverage
                           Customer and Plexus agree to review obsolete,
                           inactive and excess component(s) inventory on a
                           monthly basis, and to agree to disposition of such
                           material. Customer further agrees to issue monthly
                           Purchase Orders for actual purchase price plus margin
                           of all obsolete, inactive and excess materials(s),
                           due to changes in Customer's demand.

                  m)       Cancellation
                           Customer may cancel requirements defined in orders
                           and/or forecasts at any time before the scheduled
                           delivery date. Any assembly requirements canceled
                           within the manufacturing lead-time of the scheduled
                           delivery date will be invoiced at the full agreed to
                           price for the completed assembly.

                           For assembly requirements canceled outside the
                           manufacturing lead time of the scheduled delivery
                           date, Customer's liability to Plexus will be the
                           value of the components in Plexus' inventory
                           (including the full markup as defined in the Plexus
                           quotation), and other components for which Plexus has
                           liability but which are not in Plexus inventory, as
                           well as payment for any and all in-process
                           manufacturing costs and expenses, and reasonable
                           administrative costs and expenses. Plexus will
                           deliver an itemized list of these costs to customer.
                           Customer agrees to pay the costs identified by Plexus
                           within thirty (30) business days of notification of
                           such costs. To help

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                           minimize the impact of cancellation charges, Plexus
                           will attempt to restock components at the supplier,
                           resell the components, and/or utilize the components
                           on non-customer assemblies.

                  n)       Cost Reduction
                           Cost Reductions will be reviewed by both parties
                           quarterly. Plexus initiated cost reductions will be
                           shared 50/50 for the term of this Agreement. Customer
                           initiated reductions will be passed through at full
                           value. Actual cut-in reduction will based upon, at
                           minimum, inventory at Plexus and committed on-order
                           Product with Plexus' suppliers.

                  o)       Customer Property
                           Tooling and consigned material - Plexus has the
                           responsibility to have proper security, and material
                           storage. Customer shall be responsible for repairing,
                           upgrading, replacing and/or maintaining the materials
                           and/or equipment consigned to Plexus. However, Plexus
                           shall provide routine maintenance, of which
                           associated costs are borne by the Customer.

                  p)       Cost Increases or Changes
                           Parties will meet quarterly to discuss cost increases
                           or changes due to parts demand and availability.

         3. PACKAGING AND SHIPPING

                  a)       Product will be shipped to the customer in a manner
                           that meets industry standard packaging requirements.
                           Plexus is not liable for design related packaging
                           issues but is liable for products improperly
                           packaged. Customer is responsible for the selection
                           of the shipping company unless otherwise directed.

                  b)       Distribution Services: Plexus will provide Customer
                           with "Direct Ship" Distribution Services for the
                           specified product(s) identified in the Pricing Model
                           (Attachment D ), attached hereto and made a part
                           hereof. Prior to expanding these services for
                           additional product(s), Plexus and Customer must
                           review and mutually agree upon written changes to
                           this Agreement.

                  c)       Upon manufacturing completion of Direct Ship product,
                           Plexus will invoice Customer and identify/store
                           product as Customer's Finished Goods Inventory in an
                           approved storage location. Consequent to the invoice
                           transaction, Customer assumes complete title,
                           liability, and ownership of the Customer's Finished
                           Goods Inventory, which includes insurance coverage
                           and loss of product. Plexus assumes no liability for
                           Customer's Finished Goods Inventory on the premise or
                           in transit.

                  d)       At some point in time the Customer will provide
                           completely functional computer terminals, with
                           applicable hardware and software, dedicated printer,
                           and access to Customer's computer system.
                           Additionally, Customer will provide necessary
                           training and on-going computer support. At such time
                           immediately following the invoice transaction, Plexus
                           will "receive" Direct Ship product onto Customer's
                           computer system.

                  e)       When Plexus receives signal to direct ship product,
                           Plexus will complete appropriate actions and
                           transactions on Customer's computer system to
                           package, per specifications, and ship product. Plexus
                           to ship product 3rd party. Freight charges related to
                           this activity shall be borne by Customer. Plexus will
                           guarantee same business day shipment of product for
                           domestic locations, if signal is received prior to
                           2:00 p.m. CST. For signals received after 2:00 p.m.
                           CST, Plexus will make every effort to ship domestic
                           locations the same business day, but will guarantee
                           next business day shipment. Plexus will guarantee
                           shipment of product for all international locations
                           within two (2) business days. If any order(s) or
                           combination of orders exceed agreed upon Finished
                           Good Inventory "FGI" levels this subsection 3(e) does
                           not apply and shall not be enforced.

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                           The cost to provide these Direct Ship Distribution
                           Services will be included in the unit price of each
                           assembly shipped. Payment terms and conditions shall
                           be pursuant to this Agreement.

                  g)       Any EC's that will require re-work and/or upgrade for
                           Customer Finished Goods Inventory shall be the sole
                           liability of the Customer and follow standard
                           re-work/upgrade policies and procedures as specified
                           in this Agreement.

         4. FINISHED GOODS INVENTORY

                  a)       Finished Goods Inventory Introduction
                           The Customer has requested Plexus to begin building a
                           finished goods inventory ("FGI") of Customer's
                           product(s)hereinafter "finished assemblies or
                           product(s)") and store ("warehouse") such finished
                           assemblies on site at Plexus' facilities and/or
                           warehouse(s) after issuance of Customer's purchases
                           orders, for indefinite periods of time, until higher
                           level assembly or delivery instructions are issued by
                           the Customer.

                  b)       Payment Terms related to FGI
                           Customer further agrees to and understands that once
                           Product(s) is receipted into FGI, Plexus shall issue
                           an invoice for that Product(s) and payment terms
                           shall be as set forth in Section 5 of this Agreement.

                  c)       Cancellation of Purchase Orders related to FGI
                           The Parties agree that cancellation by the Customer
                           of any of the Purchase Orders issued to Plexus
                           relating to such finished goods inventory will create
                           material liability on behalf of the Customer, and
                           Customer agrees to abide by all the terms and
                           conditions set forth in Section C "Standard Terms and
                           Conditions" of this Agreement regarding cancellation
                           of Purchased Orders in the event of such
                           cancellation.

                  d)       Purchase Orders related to FGI
                           The finished goods inventory quantities will be
                           determined by the purchase orders issued by Customer
                           to Plexus. Plexus agrees to place this product in FGI
                           based on the same terms and conditions set forth in
                           Section C "Standard Terms and Conditions" of this
                           Agreement.

                  e)       Location of FGI
                           Plexus agrees to make available to Customer a
                           secured, segregated area at Plexus' facility for the
                           purpose of maintaining and storing Finished Goods
                           Inventory (hereinafter "FGI"). Plexus will furnish
                           sufficient heat and electricity, without charge to
                           Customer to adequately store such FGI. Plexus agrees
                           to maintain the storage area of the FGI in a clean
                           and orderly manner.

                  f)       Storage of FGI
                           Customer agrees Plexus shall be allowed, without
                           Customer's prior consent written or otherwise, to
                           make any alterations, additions, or improvements in
                           or to the storage area premises storing Customer's
                           FGI, as Plexus deems necessary for any reason. If for
                           the safety of the FGI Plexus is forced to relocate
                           Customer FGI, Customer agrees to allow Plexus access
                           to the FGI as needed and as required by Plexus.

                  g)       Stocking of FGI
                           Plexus shall stock FGI inventory in such a manner, in
                           Plexus' sole discretion, that is acceptable by the
                           Customer, and in Plexus' normal storage methods
                           relating to its engineering and manufacturing
                           services. Stocking requirements of customer may be
                           amended from time to time by mutual consent of both
                           parties and after a reasonable history of production
                           levels and/or demand is established. Shipments of FGI
                           inventory to the Customer's dock shall be handled in
                           the same manner as set forth in this Agreement. Such
                           inventory will remain the property of Plexus and
                           Plexus shall retain title and risk of loss to the FGI
                           until Customer issues a Purchase Order for such FGI
                           and Plexus invoices Customer for such FGI. Upon
                           issuance of Customer PO and invoice of FGI all title
                           and risk of loss shall be passed to the Customer.

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                  h)       Title and Risk of Loss related to FGI
                           Customer will assume all risk of loss or damage,
                           regardless of cause, to any of its property or any
                           property belonging to its employees upon transfer of
                           title and risk of loss of FGI to the Customer as
                           discussed previously. Plexus will at all times carry
                           adequate Worker's Compensation Insurance and such
                           appropriate insurance to cover its employees that are
                           mandated by federal or by state law of the state(s)
                           in which the employees perform work relating to
                           Customer's FGI. Plexus agrees to take all necessary
                           precautions to prevent injury or death to persons or
                           damage to property during the course of its
                           performance under this Agreement regarding Customer
                           FGI. However, Customer will maintain adequate risk of
                           loss, all, general liability, or other insurance, as
                           appropriate, for all FGI of which title and risk of
                           loss has been transferred to the Customer. Customer
                           shall name Plexus as additional insured, as evidenced
                           by a Certificate of Insurance, and evidencing such
                           policies, within thirty (30) days after execution of
                           this FGI Agreement and upon request by Plexus
                           thereafter.

                  i)       Quantity related to FGI
                           The FGI inventory and quantity of FGI to be
                           maintained by Plexus shall be mutually agreed upon
                           during the term of this Agreement and will be
                           specified by the purchase orders issued by the
                           customer to Plexus. Plexus may delete or discontinue
                           any type of FGI inventory from its storage area in
                           Plexus' facilities at any time, with sixty (60) days
                           prior written notice to Customer, or mutual written
                           agreement between the parties.

                  j)       Taxes related to FGI
                           Notwithstanding anything to the contrary, Customer
                           further agrees to and is responsible for the payment
                           of personal property taxes, or additional corporate
                           income taxes, if any, incurred by Plexus, on FGI
                           inventory sold to Customer resulting from the sale of
                           FGI. Customer further agrees to assist Plexus with
                           the reporting requirements of any personal property
                           or corporate income taxes upon Plexus' request, if
                           necessary.

                  k)       Plexus Personnel related to FGI
                           The storage area of Customer's FGI will be operated
                           by Plexus' personnel who will remain employees of
                           Plexus and on Plexus' payroll and will not be
                           considered employees of Customer. All of Plexus'
                           employees shall be subject to the reasonable rules
                           and regulations at any time promulgated by Plexus for
                           the safe, orderly, and efficient conduct of
                           operations of Customer's property. Customer shall
                           designate a specific managerial or person regarding
                           Customers FGI.

                  1)       UCC Filing related to FGI
                           Customer may, after prior written approval of Plexus,
                           and only after title and risk of loss has been
                           transferred to the Customer, file a Uniform
                           Commercial Code Form 1 (UCC-1), or any other UCC
                           form, as evidence of its title, or the creation of a
                           lien, of its inventoried FGI Product in Plexus'
                           facility, with any governing federal, state or city
                           agency or public records office, as necessary. Plexus
                           agrees to assist Customer, at Customer's sole
                           expense, with any necessary paperwork to secure such
                           notice of lien and/or evidence of title, as requested
                           by Customer.

         5. PRICING AND PAYMENT
         As full compensation for the assemblies provided by Plexus hereunder
         and its obligations contained herein, Customer will make payments
         subject to terms of net amount due twenty (20) days following the date
         of the invoice. Plexus and Customer will review the status of credit
         history on a regular basis, and, after sufficient credit history is
         established by the Customer, Plexus may amend payment terms at its sole
         discretion. Unless stated otherwise, prices quoted are F. 0. B. Plexus'
         manufacturing facility. Unless specifically stated otherwise, all
         quoted prices are firm for thirty (30) days from the date of quotation.
         Quotations are based on drawings, specifications, and other written
         information available to Plexus at the time of quotation. Any
         additional data supplied at the time of purchase may necessitate price
         adjustments. Any manufacturer's tax, retailer's occupation tax, use
         tax, sales tax, excise tax, or tax of any nature whatsoever imposed on
         or measured by the transaction between Plexus and Customer shall be
         paid by the Customer in addition to the prices quoted or invoiced. In
         the event Plexus is required to pay such tax, the Customer shall
         reimburse Plexus therefore, within ten (10) days of written demand by
         Plexus to the Customer for such reimbursement. If the transaction
         between

Sitara Networks-Final Execution Comprehensive Professional Services Agreement

                                                                               9
<PAGE>   10
         Plexus and the Customer is exempt from all such taxes, Customer shall
         provide Plexus with a tax exemption certification or other document
         acceptable to all taxing authorities at the time the order or contract
         is submitted.

         The parties further agree to the credit terms and conditions set forth
         in Attachment A, "Payment Terms", dated February 3, 2000, and attached
         hereto and made a part hereof. Plexus and Customer will review the
         status of credit history on a regular basis, and, after sufficient
         credit history is established by the Customer, Plexus will remove the
         credit restrictions set forth in Attachment A, "Payment Terms", and all
         business shall resume subject to the payment terms and provisions set
         forth in this Section 3 Payment, above.

         6. WARRANTY
         PLEXUS EXPRESSLY WARRANTS THE WORK AS SET FORTH HEREIN. PLEXUS MAKES NO
         OTHER WARRANTIES, EITHER EXPRESS OR IMPLIED (INCLUDING WITHOUT
         LIMITATION WARRANTIES AS TO MERCHANTABILITY OR FITNESS FOR PARTICULAR
         PURPOSES). IN ADDITION, THE FOLLOWING SHALL CONSTITUTE THE EXCLUSIVE
         REMEDIES FOR CUSTOMER FOR ANY BREACH BY PLEXUS OF ITS WARRANTIES
         HEREUNDER.

         Plexus warrants the assemblies against all defects in ) workmanship -
         where the assemblies do not conform to the agreed upon manufacturing
         specifications, for a period of fifteen (15) months from date of
         shipment, provided agreed upon testing is conducted by Plexus prior to
         shipment, except as set forth below. If the materials (components)
         furnished contains a manufacturer's warranty, Plexus hereby extends, to
         the extent possible, such Component Manufacturers' warranty to
         Customer. Plexus shall repair or replace, at Plexus' option and free of
         charge, any portion of the assemblies which is returned to Plexus'
         factory securely packaged, insured and with freight pre-paid within the
         warranty period, and which upon examination Plexus determines in its
         sole discretion to be defective in workmanship. Plexus will return the
         repaired or replaced assemblies to customer with freight pre-paid.

         Plexus is responsible for determining root cause of any defective
         assemblies, and will work with Customer and material supplier to
         develop corrective actions. Customer and Plexus will work cooperatively
         in pursuing corrective action if a third party is determined to cause
         failures. In the event Customer and Plexus are unable to reach an
         agreement for a resolution of a deficiency caused by a third party,
         then Plexus will recommend the final solution and/or corrective action
         plan to remedy any defect caused by such third party. Plexus will allow
         Customer to participate in any discussions with such third party as
         requested.

         This Warranty does not apply to:

                  a)       Design deficiencies. Plexus expressly disclaims any
                           warranty responsibility for design deficiency, and
                           for infringement for the like.

                  b)       Any modifications and/or alterations made to the
                           Assemblies, or any portion thereof, without the
                           express written authorization of Plexus obtained in
                           advance. If this is the case, all warranties made
                           herein are invalid and Customer shall have no further
                           remedies hereunder against Plexus.

                  c)       Any defect, loss or damage resulting from theft,
                           loss, fire, misuse, abuse, negligence, vandalism,
                           acts of God, accident, casualty, power failures or
                           surges, alteration, modification or failure to follow
                           installation, operation or maintenance instructions,
                           or any other cause beyond Plexus' reasonable control.

                  d)       Any defect, unless written notice of the defect is
                           given by the Customer to Plexus as soon as practical
                           after the defect first appears. The right to make a
                           claim under this warranty expires fifteen (15) months
                           from the date of shipment. Actions taken by Plexus to
                           correct any defect shall not extend beyond this
                           period.

                  e)       Components incorporated into the assemblies.

         IN NO EVENT, REGARDLESS OF CAUSE, SHALL PLEXUS BE LIABLE FOR
         INCIDENTAL, INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSSES OF
         ANY KIND, WHETHER IN CONTRACT OR IN TORT, ARISING FROM ITS PERFORMANCE
         UNDER THIS AGREEMENT.

Sitara Networks-Final Execution Comprehensive Professional Services Agreement

                                                                              10
<PAGE>   11
         7. TEST EQUIPMENT
         Unless otherwise noted, any test equipment quoted herein is warranted
         to be free from defects in material and workmanship for a period of one
         (1) year from the date of certification. After the warranty period the
         equipment will be repaired on a time and materials basis. Labor will be
         charged at the current billing rate. Parts will be charged at cost plus
         markup. Travel expenses will be added to any repairs including travel
         between Plexus and/or one of its affiliates. All dedicated test/burn in
         fixtures will be progress billed monthly up to 95% of the program cost.
         The remaining 5% is due upon fixture certification.

         8. DOCUMENTATION
         The Customer is responsible for supplying Plexus with complete
         documentation. This includes, at a minimum, (three) 3 complete and
         current sets of documentation including, at a minimum, all prints,
         softwares, artwork, and bill of materials with manufacturer and part
         number, and any specifications, including test specializations or
         procedure, called for on any customer prints. It is the Customer's
         responsibility to assure that Plexus receives timely notification of
         any changes to the documentation, and updated prints reflecting the
         changes.

         9. TOOLING
         All tooling produced or obtained for the assemblies delivered hereunder
         and paid for by Customer shall become and remain the property of
         Customer at the time payment in full is received for the tooling by
         Plexus. Such tooling shall be used by Plexus only for the benefit of
         Customer, and shall be delivered to Customer upon request. If Customer
         requests the return of any tooling from Plexus and Plexus determines
         the return of such tooling prevents Plexus from providing the
         assemblies to Customer, then Plexus shall inform Customer in writing,
         and Customer and Plexus shall negotiate a mutually acceptable
         resolution.

         Customer, at its sole discretion, may consign to Plexus, items,
         including, but not limited to, materials and/or equipment relating to
         the production and/or testing of the assemblies at Plexus' location.
         The material and/or equipment shall be utilized by Plexus only for the
         production and/or testing of the assemblies. Customer shall assist
         Plexus in installing the materials and/or equipment and shall provide
         training and maintenance instructions, if requested by Plexus or
         required by Customer. Customer shall be responsible for repairing,
         upgrading, replacing and/or maintaining the materials and/or equipment
         consigned to Plexus. However, Plexus shall provide routine maintenance.

         All tooling quoted herein is quoted at the cost to Plexus from its
         suppliers. A charge of 10% will be added to all tooling with a cost of
         less than $5,000, and a 5% charge added to all tooling with a cost of
         $5,000 or greater.

         10. TERMINATION AND CANCELLATION OF MANUFACTURING PHASE
         During the Manufacturing Phase, either party shall have the right to
         terminate any or all activities under this agreement for any reason and
         at any time upon ninety (90) days prior written notice to the other
         party. Plexus agrees to immediately terminate the specified activity
         pursuant to this Agreement upon termination or cancellation. If this
         entire Agreement is terminated, all existing Customer POs shall be
         deemed to have been canceled unless otherwise specified by Customer.
         Customer agrees to reimburse Plexus for unrecovered expenses. In
         addition, Customer and Plexus shall negotiate a settlement of charges,
         if any, for reasonable and allowable expense directly incurred by
         Plexus including, but not limited to, manufacturing process ramp down
         costs and packaging and transportation costs and expenses, and the
         return to Customer of any Customer owned material(s), tools, equipment
         and/or any other related items, consistent with Section B2, above.

         If this entire agreement is terminated, then Plexus shall:

                  a)       Deliver to Customer all completed assemblies which
                           conform to the applicable and then current
                           specifications and requirements; and

                  b)       Return to Customer, at Customer's expense, all
                           tooling, equipment, Components and/or Long Lead Time
                           Components, drawings, specifications, documentations
                           and supplies that are owned by Customer pursuant to
                           the Agreement; and

                  c)       Prepare and submit to Customer an itemized document
                           to include the quantity of assemblies in the
                           production process.

Sitara Networks-Final Execution Comprehensive
Professional Services Agreement                                               11
<PAGE>   12
         Upon such termination, all existing Customer POs shall be deemed to
         have been canceled unless otherwise specified by Customer and Customer,
         agrees to reimburses Plexus for unrecovered expenses, consistent with
         section B2, above.

C. STANDARD TERMS AND CONDITIONS
The terms and conditions set forth in this Section C, Standard Terms and
Conditions shall be applicable to Product Development and Prototype Phase, and
Manufacturing Phase of this Agreement.

         1. MUTUAL COOPERATION
         Plexus represents that it will pursue the Agreement to the best of its
         ability and in the best interest of the Customer, and the Customer
         represents that it will cooperate with Plexus in reaching the
         objectives of the Agreement. Plexus will appoint a project manager that
         is acceptable at al times with Customer for the duration of the
         Agreement and will require the Customer to establish one person to
         coordinate all activities through. In the event that the project
         manager is not operating in the best interest of the Customer, the
         Customer shall contact Plexus to discuss Agreement related concerns
         and/or complaints.

         2. CONFIDENTIAL INFORMATION
         Plexus and the Customer will use best efforts to prevent the disclosure
         of any confidential information, unless specifically instructed
         otherwise in writing by the disclosing party, and excepting in such
         instances where Plexus may be compelled by law to make disclosures. The
         mechanisms for controlling and processing confidential information may
         be covered under a separate Confidential Disclosure Agreement (if
         required).

         3. FORCE MAJEURE
         Plexus shall not be liable for any delay in or failure of performance
         under this agreement due to any contingency beyond Plexus' control,
         including, but not limited to, an act of God, war, insurrection, fire,
         riot, strike or labor dispute, sabotage, act of public enemy, flood,
         storm, accident, equipment failure, inability to obtain suitable or
         sufficient labor or material, laws or regulations, or any other cause
         beyond its reasonable control.

         4. INTELLECTUAL PROPERTY RIGHTS
         All patents, copyrights, trademarks, or other rights pertaining to
         inventions, developments, or improvements made in the course of the
         work, and funded by the Customer, are the property of Customer. Plexus
         will, upon written direction from Customer, execute any and all papers
         and documents prepared or submitted by Customer as may be reasonably
         required to transfer or secure to Customer full title and authority
         over such rights. Plexus will be compensated by Customer for time and
         expense as incurred in this obligation at the then current billing
         rates for those of its employees necessary for these purposes.

         Customer agrees that it shall assume all responsibility for determining
         whether the assemblies to be designed and assembled infringe an any
         patent, copyright or trademark, and Customer shall indemnify and hold
         harmless Plexus from any liability, including legal costs and expenses,
         damages and attorney fees arising from any claim demand or suit,
         including a claim by Customer, based on allegations or claims that the
         assemblies or any design, patent, copyright, or trademark sought to be
         obtained or obtained by Customer as a result of this agreement
         constitutes an infringement of any patent, trademark or copyright of
         the United States or any foreign county.

         In the event any such claim or suit is asserted or instituted against
         Plexus, Plexus shall promptly notify Customer of the assertion of any
         such allegation or claim. Customer shall thereupon assume
         responsibility for and conduct the defense of each assertion or suit at
         its expense, and reasonable information and assistance for the defense
         of same shall be provided by Plexus for which Plexus will be
         compensated for time and expenses at its then current billing rate.
         Plexus shall have the right, at its expense, to be represented in the
         defense of any such assertion or suit by counsel of its own selection.

         The prices quoted do not include, unless specifically stated otherwise,
         the cost for testing and/or submittals for assembly approvals or any
         annual file maintenance fee, such as for UL, VDE, CSA or FCC. Plexus
         will assist Customer in obtaining such approvals and charge for same
         services at Plexus' current hourly billing rate.

Sitara Networks-Final Execution Comprehensive
Professional Services Agreement                                               12
<PAGE>   13
         However, if Plexus has done the initial design for Customer, they agree
         to use design practices that conform with all standard industry agency
         requirements.

         5. LIABILITY AND INDEMNIFICATION
         Plexus will use its discretion to pursue the Agreement in the best
         interest of Customer. Plexus will be under no liability to Customer or
         otherwise for its choice of methods employed, the character or tests
         and experiments performed, the results obtained, nor for the use which
         shall thereafter be made by Customer of such results. IT IS UNDERSTOOD
         THAT OTHER THAN THE WARRANTY SET FORTH IN SECTION B4, NO OTHER
         GUARANTEES OR WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, ARE GIVEN BY
         PLEXUS, INCLUDING, BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY
         OR FITNESS FOR A PARTICULAR PURPOSE. PLEXUS SHALL NOT BE LIABLE FOR ANY
         INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING LOST PROFITS)
         SUSTAINED OR INCURRED IN CONNECTION WITH THIS AGREEMENT.

         Customer will fully indemnify and hold harmless Plexus from any and all
         liability, claims demands, costs and expense arising out of the use,
         publication, and/or marketing of the results of Plexus' efforts, the
         functioning of the assemblies or the product(s) which they are a pan
         of, or any other matter resulting from Plexus' performance under this
         Agreement, whether such liability, claims or demands be in the nature
         of patent, trademark or copyright infringement, public or product
         liability, contract liability, or otherwise during or following the
         terms of this Agreement, and Customer shall, at its own expense, defend
         any and all such actions based thereon and shall pay all attorney's
         fees and cost and other expenses arising therefrom.

         Plexus will not be liable for errors, or expenses which may be incurred
         in its performance of this work which results from the engineering
         and/or design of the Assemblies, or from Plexus' reliance upon
         information, technological records, sketches, drawings, or prototypes
         furnished by Customer or Customer's design engineering firm. Customer
         will forthwith, during the term of this Agreement, notify Plexus of any
         and all information, technology changes, or other facts relevant to any
         aspect or phase of the Agreement.

         6. ARBITRATION
         All rights and remedies conferred by this Agreement, by any other
         instrument, or by law are cumulative and may be exercised singularly or
         concurrently. If any provision of this Agreement is held by any court
         or governmental agency to be invalid, such invalidity shall not affect
         the enforceability of any other provision(s) hereof. This Agreement and
         any Purchase Orders issued hereunder shall be governed by and
         interpreted in accordance with the laws of the Commonwealth of
         Massachusetts. Unless otherwise agreed to in writing by the parties,
         any controversy or claim arising out or relating to this Agreement, or
         the parties' decision to enter into this Agreement, or the breach
         thereof, shall be settled by arbitration through the American
         Arbitration Association and in accordance with the Commercial
         Arbitration Rules of the American Arbitration Association. The
         arbitration proceeding shall be conducted and presided over by a single
         neutral arbitrator chosen pursuant to American Arbitration Association
         procedures. Decision of the arbitrator shall be final, binding, and not
         subject to appeal or review; provided that, either party may request
         that the arbitrator review and reconsider his or her decision, in whole
         or in part. Judgment upon the award rendered by the arbitrator may be
         entered in any court having jurisdiction thereof. The arbitration shall
         be held in Boston, Massachusetts and the arbitrator shall apply the
         substantive law of Commonwealth of Massachusetts except that the
         interpretation and enforcement of this arbitration provision shall be
         governed by the federal Arbitration Act. The arbitrator shall not award
         either party punitive damages and the parties shall be deemed to have
         waived any right to such damages.

         7. CONSENT TO JURISDICTION AND APPLICABLE LAW
         The parties hereby irrevocably submit to the jurisdiction of the courts
         of the Commonwealth of Massachusetts in any action or proceeding
         arising out of or relating to this Agreement, and the parties hereby
         irrevocably agree that all claims in respect of such action or
         proceeding may be determined by such courts. The parties hereby waive,
         to the fullest extent possible, the defense of an inconvenient forum to
         the maintenance of such action or proceeding, and the parties agree
         that a final judgement in any action or proceeding shall be conclusive
         and may be enforced in other jurisdictions by suit on the judgement or
         in any other matter provided by law.

         The parties hereby agree that this Agreement shall be governed by and
         will be construed in accordance with the laws of the State of
         Wisconsin, irrespective of the conflicts of laws provisions thereof.

Sitara Networks-Final Execution Comprehensive
Professional Services Agreement                                               13
<PAGE>   14
         8. NO RECRUITING
         Plexus and the Customer agree that during the term of this program and
         for twelve (12) months thereafter, it shall not solicit or recruit
         (even though professional recruiters) the employees of the other. This
         shall not preclude an employee of either Plexus or the Customer from
         independently pursuing and securing employment opportunities with the
         other on such employee's own initiative.

         9. ENTIRE AGREEMENT
         This Agreement, along with the proposal, and Confidential Disclosure
         Agreement and/or quotation (if any) and Plexus' invoices, contains the
         entire understanding of the parties pertaining to the subject matter
         hereof, and no other agreements, oral or otherwise, shall be deemed to
         exist or to bind the parties. Notwithstanding anything to the contrary
         contained herein, the parties hereto agree that the terms and
         conditions set forth herein and in Plexus' invoices, proposal and
         Confidential Disclosure Agreement (if any), shall supersede any and all
         terms and conditions submitted by the Customer in any document,
         including but not limited to any terms and conditions contained in the
         Customer's purchase order. This agreement may not be modified or
         terminated orally, and no claimed modification, termination, or waiver
         shall be binding unless in writing and signed by both parties.

         Accepted and agreed to:

         SITARA NETWORKS, INC.                    PLEXUS CORP.

                                                  ENGINEERING AUTHORIZATION:

         By:  /s/ Michael S. Palin               By:  /s/ [Illegible]
              -------------------------------         --------------------------
         Title: Chief Financial Officer          Title: Executive Vice President
                -----------------------------           / Tech. Group
                                                        ------------------------
         Date:  7/25/00                          Date:  7/19/00
                -----------------------------           ------------------------

                                                 MANUFACTURING AUTHORIZATION

         By:  /s/ Susan E. Fennell               By:  /s/ Chuck Williams
              -------------------------------         --------------------------
         Title: Director-Material Operations    Title:  Vice President
                -----------------------------           ------------------------
         Date:  7/25/00                          Date:  7/19/00
                -----------------------------           ------------------------

Sitara Networks-Final Execution Comprehensive
Professional Services Agreement                                               14
<PAGE>   15
                              [PLEXUS LETTERHEAD]

                                  ATTACHMENT A
                                  PAYMENT TERMS

December 13, 1999

Ms.  Susan Fennell
Sitara Networks, Inc.
60 Hickory Drive
Waltham, MA 02451

Dear Susan:

I was requested to outline the information that Plexus Electronic Assembly will
require in order to finalize the credit arrangement between Sitara Networks, Inc
and Plexus Electronic Assembly Corporation. Along with the following
information, a standard credit application, including trade and bank references
will need to be completed.

         1)   Sitara Networks will provide to Plexus Electronic Assembly,
              monthly confirmation of the available cash balances under Sitara's
              control. Such confirmation shall be from the bank or investment
              firm in which the funds are held. This information should be
              forwarded to me by the 10th day following each month-end.

         2)   Sitara Networks will provide to Plexus Electronic Assembly written
              confirmation that there are no restrictions against the use of
              Sitara's existing cash balances and, that there is no outside
              control of the use of these funds. A list of individuals
              authorized to disburse these funds should be included.

         3)   Sitara will provide quarterly financial statements to Plexus
              Electronic Assembly for review. Statements will be provided within
              20 working days after the close of each quarter. All information
              will be strictly confidential and for internal use only.

         4)   Sitara will provide cash deposits to cover all exposure created by
              Plexus Electronic Assembly purchase orders for non-cancelable /
              non-returnable material.

         5)   Initially, all products produced for Sitara will be invoiced after
              completion and transfer to finished goods. These goods will become
              the property of Sitara Networks, and Sitara will take title and
              insurability at that point.

         6)   Invoice terms will be NET 30 days from invoice date, via wire
              transfer. Payment to be received by Plexus Electronic Assembly on
              the 30th day.
<PAGE>   16
December 13, 1999
Page Two

         7)   An initial credit limit of S400,000 has been established for
              accounts receivable. If in the course of business this initial
              limit is exceeded, you will be contacted and may be required to
              pay some invoices before the NET 30 day term so as to remain
              within the limit. Any increase in the limit will be based upon
              length and status of credit history.

I thank you, in advance, for your cooperation in working to establish credit
standards, and look forward to a mutually beneficial relationship between our
two companies. If you have any questions or concerns, please contact me directly
at (920) 751-3625.

Sincerely,

/s/ Marty Verstegen

Marty Verstegen,
Controller
Plexus Electronic Assembly

Cc:      Bob Kronser, Vice President, Sales and Marketing - Plexus Corp.

                                  [PLEXUS LOGO]

                         The Product Realization Company
<PAGE>   17
                                  ATTACHMENT B

                      FLEXIBILITY PERCENTAGES PER ASSEMBLY

To be determined at a later date by mutual agreement between the parties.

Customer:   /s/ MSP / 7/25/00                  Plexus:   /s/ CW / 7/19/00
            -----------------                            ----------------
            Initial/Date                                 Initial/Date
<PAGE>   18
                                  ATTACHMENT C

                             REPORTING REQUIREMENTS

To be determined at a later date by mutual agreement between the parties.

Customer:   /s/ MWP / 7/25/00                  Plexus:   /s/ CW / 7/19/00
            -----------------                            ----------------
            Initial/Date                                 Initial/Date
<PAGE>   19
                                  ATTACHMENT D

                                  PRICING MODEL

To be determined at a later date by mutual agreement between the parties.

Customer:   /s/ MWP / 7/25/00                  Plexus:   /s/ CW / 7/19/00
            -----------------                            ----------------
            Initial/Date                                 Initial/Date

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