Document:

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                                                                    Exhibit 10.7

May 3, 2002

Len Eisenstein
4961 Densmore Ave.
Encino, CA 91436

Dear Len:

I am pleased to offer you the position of Vice President of Worldwide Sales,
with Larscom Incorporated. In this position you will report directly to me, and
your annual base salary will be $190,000, payable $7307.69 biweekly.

For the year 2002, you will be eligible for a sales commission with a target
equal to $100,000 on an annualized basis, payable monthly based on invoiced
revenue shipments. For calculational purposes, the commission will be calculated
as 0.263% of the invoiced revenue shipments during the period of your employment
up to a total of ***** million in sales for the year and 0.35% for invoiced
revenue shipments greater than this limit. The ***** million break-point
includes sales for the entire year, including the period prior to your hiring
date.

You will be eligible to participate in Larscom's Incentive Stock Option Program.
I am pleased to offer you 150,000 new hire stock option shares, subject to board
approval. The option price will be the Fair Market Value on the day the
allocation is approved by the Board of Directors. 1/6th of these options will
vest at 6 months and 1/36th per month thereafter, so as to fully vest in 3
years.

Larscom will also provide relocation assistance as described in the attached
Relocation Assistance Policy. As we discussed, the period of assistance for
either the purchase or sale of a home will not be limited to 90 days, as
described in the policy, but will be extended for a period mutually agreed to.
In addition, relocation of two cars will be provided for. Should you leave
Larscom voluntarily within 12 months of your start date, you will be responsible
for reimbursing Larscom for your relocation expenses.

As a full time employee of Larscom, you will also become eligible to participate
in a number of the company sponsored benefits. Most of the benefits are
effective on your date of hire. The enclosed packet contains descriptions of the
benefits. Please read through the information and be prepared to enroll on your
date of hire. In addition, you will be eligible for a car allowance of $800 per
month. If you have any questions about your benefits, please feel free to
contact Lawrence Coburn in our Human Resources Office (408) 941-4170.

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

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Len Eisenstein Offer Letter
Page 2
May 3, 2002

Employment with Larscom is not for a specific term and can be terminated by you
or by the Company at any time for any reason, with or without cause. Any
contrary representations, which may be made to you, are superseded by this
offer.

Upon acceptance of employment, the terms described in this letter shall be the
terms of your employment. Any additions or modifications of these terms would
have to be in writing and signed by myself as President of the company.

This employment offer is contingent on signing the Proprietary Information and
Inventions Agreement, providing the Company with the required legal proof of
your identity and authorization to work in the United States within three (3)
working days from hire date, and satisfactory completion of a drug screen test
and a background investigation.

A copy of the letter has also been included for your files. If not accepted,
this offer will expire on Wednesday, May 8, 2002.

I am looking forward to your joining us as we enter an exciting and potentially
rewarding growth period. Upon acceptance of this offer, please designate a
convenient start date.

Sincerely,

/s/ Daniel Scharre
------------------
Daniel Scharre
President and CEO

I accept this offer.

/s/ Len Eisenstein
------------------

Len Eisenstein         Date: 5/9/02

My start date will be:     5/29/02
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                           Date<PAGE>

                                                                    Exhibit 10.8

April 9, 2002

Mr. Daniel Scharre
President and Chief Executive Officer
Larscom Incorporated
1845 McCandless Drive
Milpitas,  CA   95035

Dear Dan:

Per our recent discussions, in consideration of the transactions described
below, the parties agree as follows:

1. Payment. Upon execution of this letter agreement and concurrently with
delivery of the Deposit Materials (defined in paragraph 2, below), Larscom will
remit ***** to Oasys Telecom as consideration for the performance of Oasys
Telecom's obligations under this letter.

2. Mutually-Agreed Release of Deposit Materials. Pursuant to the Preferred
Escrow Agreement among the parties and DSI Technology Escrow Services, Inc.
("DSI") dated September 7, 2001 (Account Number 1501015-00001) (the "Escrow
Agreement"), DSI holds certain tangible personal property of Oasys embodying
certain technology and materials of Oasys Telecom, which tangible personal
property is referred to in such escrow agreement as the "Deposit Materials"
(herein also the "Deposit Materials"). Oasys Telecom hereby sells, assigns and
transfers to Larscom full rights of ownership, and clean title, in and to the
Deposit Materials. For greater certainty and without limiting the foregoing, the
foregoing transfer of the Deposit Materials does not transfer to Larscom of any
of Oasys Telecom's copyright, trade secret, patent, or other intellectual
property rights in or to the Deposit Materials (the "Oasys IP"), which rights
Larscom shall receive only by virtue of the license granted in paragraph 3,
below. Upon execution of this letter agreement, Oasys Telecom and Larscom will
execute and deliver to DSI the letter of instruction to DSI attached hereto as
Exhibit A to effect the release and delivery of the Deposit Materials to
Larscom. The transfer and delivery of the Deposit Materials hereunder, and the
rights of Larscom pursuant to the license granted in paragraph 3, below, are
unconditional (including, without limitation, any condition or limitation
contained in the Escrow Agreement) and irrevocable.

3. Grant of License. Oasys hereby unconditionally grants to Larscom a perpetual
and irrevocable, royalty-free, fully paid-up, non-exclusive, worldwide license,
under Oasys Telecom's intellectual property rights in and to the Deposit
Materials, to: (i) make, have made, use, sell, sell for use, offer for sale,
import, distribute, support and otherwise commercialize the products which are
the subject of the Deposit Materials and modifications thereof; (ii) copy,
reproduce, distribute and support the software included in the Deposit Materials
(as object code only), customer documentation and modifications of the
foregoing, in connection with the commercialization of such products; (iii)
debug, customize, update, enhance, make improvements to and otherwise modify the
products, and all related software, customer documentation and other materials;
and (iv) use, copy, reproduce, create derivative works of and modify the Deposit
Materials in connection with any of the foregoing.

The rights granted above may not be sublicensed by Larscom except that, subject
to the terms in the previous paragraph, Larscom may grant appropriate
sublicenses: (a) to its customers in connection with their use of the products;
(b) to third party resellers, distributors and others in Larscom's channels of
distribution; and (c) to Larscom's consultants, independent contractors and
third party manufacturers engaged by Larscom to provide consulting design,
manufacturing and testing services.

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

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Larscom acknowledges and agrees that Oasys Telecom shall continue to own all
right, title and interest in and to the underlying Oasys IP. Oasys Telecom
acknowledges and agrees that Larscom shall own all right, title and interest,
including all intellectual property rights, in and to any customizations,
updates, enhancements or improvements to, or derivative works or other
modifications of, the Deposit Materials or the technology, products, software or
customer documentation described or contained therein, created, developed or
made by or for Larscom.

4. Miscellaneous. Neither party may assign its rights or obligations hereunder
without the other party's prior written consent; provided, however, Larscom may
assign this letter agreement or the rights granted herein in connection with a
sale of all or substantially all of Larscom's assets or business relating to
products made pursuant to such license or an acquisition of a controlling
interest in Larscom's equity securities or in connection with a merger,
consolidation, reorganization or other like transaction. This letter agreement
will be governed by and construed in accordance with the laws of the State of
California as applied to agreements entered into and to be performed entirely
within California by California residents. Any dispute between the parties
arising out of or relating to this letter agreement (other than actions seeking
only equitable remedies) shall be settled by binding arbitration pursuant to the
Commercial Arbitration Rules of the American Arbitration Association. This
letter agreement is the complete and entire agreement of the parties relating to
the subject matter hereof. To the extent of any actual conflict between this
letter agreement and any prior agreement between the parties, the provisions of
this letter agreement shall take precedence and control.

I would be grateful if you would promptly execute and return a copy of this
letter to me to confirm the terms hereof. I look forward to a continued
productive business relationship.

Sincerely,

/s/ Gerard Miille

Gerard Miille, President and Chief Executive Officer

ACKNOWLEDGED AND AGREED

LARSCOM INCORPORATED

By: /s/ Daniel Scharre
      Daniel Scharre, President and Chief Executive Officer

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                                    Exhibit A

April 9, 2002

DSI Technology Escrow Services, Inc.
Contract Administration
9265 Sky Park Court, Suite 202
San Diego, CA 92123

Re: Release of Deposit Materials to Preferred Beneficiary and Termination of
    Escrow Account -- Account Number 1501015-00001

Dear Contract Administrator:

         Pursuant to Section 5.4 of the Preferred Escrow Agreement among Data
Securities International, Inc. ("DSI"), Oasys Telecom, Inc ("Oasys") and Larscom
Incorporated ("Larscom"), dated September 7, 2001, (the "Agreement"), Oasys
hereby instructs DSI to release all of the Deposit Materials (as defined in the
Agreement) to Larscom and to deliver the same to the Larscom representative
identified below or to such other person as Larscom may designate:

                  Larscom Representative: Tom Hornish

                  Further, pursuant to Section 5.1 of the Agreement, Oasys and
Larscom hereby jointly instruct DSI that the Agreement is terminated as of the
date of this letter. In addition, Oasys and Larscom acknowledge and agree as
follows: (i) upon completion of the release and delivery of the Deposit
Materials, unless otherwise agreed-to by the parties, Oasys shall have no
further obligation under Section 11.5 of the OEM Agreement between the parties
dated May 1, 2001, as amended on September 7, 2001, to establish an Escrow
Account or deposit or update Escrow Material (as those terms are defined in
Section 11.5 of the OEM Agreement, as amended); and (ii) the remainder of the
OEM Agreement, as amended, will continue in full force and effect pursuant to
its terms.

Sincerely,

/s/ Gerard Miille
Gerard Miille, President and Chief Executive Officer

ACKNOWLEDGED AND AGREED

LARSCOM INCORPORATED

By: /s/ Daniel Scharre
     Daniel Scharre, President and Chief Executive Officer

Address: 1845 McCandless Drive,
         Milpitas, CA 95035

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