Document:

<PAGE>

                                                                    EXHIBIT 10.3

December 4, 2001

Lewis Chakrin

Dear Lew:

I am pleased to offer you a special retention opportunity, to recognize your
outstanding performance and contributions to AT&T Wireless.

This letter outlines the components of this bonus plan.

Our desire is for you to receive a gross amount of $1 million over the next four
years. Payouts will begin in January 2002, and will occur every 6 months as
follows:

<TABLE>
<CAPTION>
TARGET PAYOUT DATE                     GROSS AMOUNT
------------------                     ------------
<S>                                    <C>
January 15, 2002                         $125,000
July 15, 2002                            $125,000
January 15, 2003                         $125,000
July 15, 2003                            $125,000
January 15, 2004                         $125,000
July 15, 2004                            $125,000
January 15, 2005                         $125,000
July 15, 2005                            $125,000
</TABLE>

Please note that all applicable withholding taxes will be deducted from these
payouts, which will occur with the regularly-scheduled payroll that occurs on or
immediately following the target payout dates. Payouts may not be deferred, nor
are they eligible for the 401(k) or stock purchase plans.

Payouts are contingent on your remaining employed by AT&T Wireless in a
comparable position on the target payout dates. If you terminate employment in a
year prior to receiving the payout, you will not be eligible for a prorated
portion of that year's retention bonus.

<PAGE>

Lew, I look forward to continuing to work with you over the coming years, and
appreciate your hard work and recent success in the TeleCorp acquisition. If you
have any questions, please call Jane Marvin at 425.580.4591 or myself.

Sincerely,

John D. Zeglis
Chairman and CEO
AT&T Wireless<PAGE>

                                                                    Exhibit 10.4

                    [AT&T WIRELESS SERVICES, INC. LETTERHEAD]

                                                  February 12, 2004

Lewis Chakrin
One AT&T Way
Bedminster, New Jersey 07921

Dear Lew:

            Pursuant to the authority granted to me under the resolutions
adopted by the Compensation Committee of the Board of Directors of AT&T Wireless
Services, Inc. (the "Company") on January 19, 2004, in the event that your
employment terminates pursuant to any of the events described in Article III of
the Company's Amended and Restated Senior Officer Severance Plan (the "Plan"),
notwithstanding the provisions of the penultimate sentence of Section 7.6 of the
Plan, in addition to the severance benefits set forth in the Plan, you shall be
entitled to an additional payment under the Plan equal to the product of (a) the
Multiple (as defined in the Plan) and (b) $20,833. In consideration for the
foregoing, the Company reserves the right to make any payments otherwise due to
you under retention arrangements existing as of the date hereof on a monthly
basis rather than an semi-annual basis.

            The Company's obligation to make the payments provided for in this
letter and otherwise to perform its obligations hereunder shall not be affected
by any set-off, counterclaim, recoupment, defense, or other claim, right or
action that the Company may have against you or others. In no event shall you be
obligated to seek other employment or take any other action by way of mitigation
of the amounts payable to you under any of the provisions of this letter, nor
shall the amount of any payment hereunder be reduced by any compensation earned
by you as a result of employment by another employer.

            This letter shall be binding upon any successor of the Company or
its businesses (whether direct or indirect, by purchase, merger, consolidation
or otherwise), in the same manner and to the same extent that the Company would
be obligated under this letter if no succession had taken place. The term
"Company," as used in this letter, shall mean the Company as hereinbefore
defined and any successor or assignee to the business or assets which by reason
hereof becomes bound by this letter.

<PAGE>

            This letter shall be governed by, and construed in accordance with,
the laws of the State of Washington, without reference to its conflict of law
rules. All benefits hereunder are subject to withholding for applicable income
and payroll taxes or otherwise as required by law.

                                                    Sincerely,

                                                    Jane Marvin
                                                    Executive VP Human Resources
                                                    AT&T Wireless Services, Inc.

Acknowledged and Agreed:

Name: __________________________________

Dated: _________________________________

                                      -2-<PAGE>

                                                                    Exhibit 10.1

                      AMENDMENT TO LOAN AGREEMENT AND NOTE

         This amendment (the "Amendment"), dated as of the date specified below,
is by and between the borrower (the "Borrower") and the bank (the "Bank")
identified below.

                                    RECITALS

         A. The Borrower and Bank have executed a Loan Agreement (the
"Agreement") dated MARCH 19, 2002 and the Borrower has executed a Note (the
"Note"), dated MARCH 19, 2002, either or both which may have been amended and
replaced from time to time, and the Borrower (and if applicable, certain third
parties) have executed the collateral documents which may or may not be
identified in the Agreement and certain other related documents (collectively
the "Loan Documents"), setting forth the terms and conditions upon which the
Borrower may obtain loans from the Bank from time to time in the original amount
of $10,000,000.000 as may be amended from time to time.

         B. The Borrower has requested that the Bank permit certain
modifications to the Agreement and Note as described below.

         C. The Bank has agreed to such modifications, but only upon the terms
and conditions outlined in this Amendment.

                               TERMS OF AGREEMENT

         In consideration of the mutual covenants contained herein, and for
other good and valuable consideration, the Borrower and the Bank agree as
follows:

         |X| Extension of Maturity Date. If checked here, any references in the
Agreement or Note to the maturity date or date of final payment are hereby
deleted and replaced with "MARCH 31, 2005".

         |X| Change in Maximum Loan Amount. If checked here, all references in
the Agreement and in the Note (whether or not numerically) to the maximum loan
amount are hereby deleted and replaced with "$20,000,000.00", which evidences an
additional $10,000,000.00 available to be advanced subject to the terms and
conditions of the Agreement and Note.

         |_| Change in Multiple Advance Termination Date. If checked here, all
references in the Agreement and in the Note to the termination date for multiple
advances are hereby deleted and replaced with "____________".

         Change in Financial Covenant(s).

                  (i) |_| If checked here, all references to "$________________"
                  in the Agreement as the minimum Net Working Capital amount are
                  hereby deleted and replaced with "$_______________" for the
                  period beginning _____________________ and thereafter.

                  (ii) |_| If checked here, all references to
                  "$________________" in the Agreement as the minimum Tangible
                  Net Worth amount are hereby deleted and replaced with
                  "$_______________" for the period beginning
                  _____________________ and thereafter.

                  (iii) |_| If checked here, all references to
                  "$________________" in the Agreement as the maximum Debt to
                  Worth Ratio are hereby deleted and replaced with
                  "$_______________" for the period beginning

<PAGE>

                  _____________________ and thereafter.

                  (iv) |_| If checked here, all references to
                  "$________________" in the Agreement as the minimum Current
                  Ratio are hereby deleted and replaced with "$_______________"
                  for the period beginning _____________________ and thereafter.

                  (v) |_| If checked here, all references to "$________________"
                  in the Agreement as the maximum Capital Expenditures amount
                  are hereby deleted and replaced with "$_______________" for
                  the period beginning _____________________ and thereafter.

                  (vi) |_| If checked here, all references to
                  "$________________" in the Agreement as the minimum Cash Flow
                  Coverage Ratio are hereby deleted and replaced with
                  "$_______________" for the period beginning
                  _____________________ and thereafter.

                  (vii) |_| If checked here, all references to
                  "$________________" in the Agreement as the maximum Officers,
                  Directors, Partners, and

                  Management Salaries and Other Compensation amount are hereby
                  deleted and replaced with "$_______________" for the period
                  beginning _____________________ and thereafter.

|X| Change in Payment Schedule. If checked here, effective upon the date of this
Amendment, any payment terms are amended as follows:

Interest is payable beginning APRIL 1, 2004, and on the same date of each
CONSECUTIVE month thereafter (except that if a given month does not have such a
date, the last day of such month), plus a final interest payment with the final
payment of principal.

Principal is payable on MARCH 31, 2005

<PAGE>

         |_| Change in Late payment Fee. If checked here, subject to applicable
law, If any payment is not made on or before its due date, the Bank may collect
a delinquency charge of _______% of the unpaid amount. Collection of the late
payment fee shall not be deemed to be a waiver of the Bank's right to declare a
default hereunder.

         |_| Change in Closing Fee. If checked here and subject to applicable
law, the Borrower will pay the Bank a closing fee of $_________ (apart from any
prior closing fee) contemporaneously with the execution of this Amendment. This
fee is in addition to all other fees, expenses and other amounts due hereunder.

         |_| Change in Borrowing Base. If checked here, the Borrowing Base is
hereby changed to an amount equal to the sum of (i) ____________% of the face
amount of Eligible Accounts, and (ii) the lessor of $________ or _____% of the
Borrower's cost of Eligible Inventory, as such cost may be diminished as a
result of any event causing loss or depreciation in value of Eligible Inventory
less (iii) the current outstanding loan balance on the note(s) in the original
amount(s) of $___________, and less (iv) undrawn amounts of outstanding letters
of credit issued by the Bank of any affiliate thereof. The Borrower will provide
the Bank with information regarding the Borrowing Base in such form and at such
times as the Bank may request. The terms used in this section will have the
meanings set forth in a supplement entitled "Financial Definitions," a copy of
which the Borrower acknowledges having received with this Amendment, which is
Incorporated herein by reference and which replaces any prior Financial
Definitions supplement.

         |_| Change in Paid-in-Full Period. If checked here, all revolving loans
under the Agreement and the Note must be paid in full for a period of at least
________ consecutive days during each fiscal year. Any previous Paid-in-Full
provision is hereby replaced with this provision.

         Default Interest Rate. Notwithstanding any provision of this Note to
the contrary, upon any default or at any time during the continuation thereof
(including failure to pay upon maturity), the Bank may, at its option and
subject to applicable law, increase the interest rate on this Note to a rate of
5% per annum plus the interest rate otherwise payable hereunder. Not
withstanding the foregoing and subject to applicable law, upon the occurrence of
a default by the Borrower or any guarantor involving bankruptcy, insolvency,
receivership proceedings or an assignment for the benefit of creditors, the
interest rate on this Note shall automatically increase to a rate of 5% per
annum plus the rate otherwise payable hereunder.

         Effectiveness of Prior Documents. Except as specifically amended
hereby, the Agreement, the Note and the other Loan Documents shall remain in
full force and effect in accordance with their respective terms. All warranties
and representations contained in the Agreement and the other Loan Documents are
hereby reconfirmed as of the date hereof. All collateral previously provided to
secure the Agreement and/or Note continues as security, and all guaranties
guaranteeing obligations under the Loan Documents remain in full force and
effect. This is an amendment, not a novation.

         Preconditions to Effectiveness. This Amendment shall only become
effective upon execution by the Borrower and the Bank, and approval by any other
third party required by the Bank.

         No Waiver of Defaults; Warranties. This Amendment shall not be
construed as or be deemed to be a waiver by the Bank of existing defaults by the
Borrower, whether known or undiscovered. All agreements, representations and
warranties made herein shall survive the execution of this Amendment.

         Counterparts. This Amendment May be signed in any number of
counterparts, each of which shall be considered an original, but when taken
together shall constitute one document.

         Authorization. The Borrower represents and warrants that the execution,
delivery and performance of this Amendment and the documents referenced herein
are within the authority of the Borrower and have been duly authorized by all
necessary action.

         Attachments. All documents attached hereto, including any appendices,
schedules, riders, and exhibits to this Amendment, are hereby expressly
incorporated herein by reference.

Dated as of: MARCH 31, 2004

                                         RADISYS CORPORATION
(Individual Borrower)                    Borrower Name (Organization)

                                         a OREGON Corporation

___________________________________

Borrower Name       N/A                  By: /s/ Brian Bronson    3/31/2004
                                             -----------------------------------

<PAGE>

                          Name and Title: Brian Bronson

                                                        Chief Accounting Officer
                                                        & Treasurer

                                                         _______________________

____________________________________     By: ___________________________________

Borrower Name         N/A                Name and Title: _______________________

Agreed to:

U.S. Bank N.A.
(Bank)

By: /s/ Le G. Phan
    --------------------------------

                LE G. PHAN
Name and Title: VICE PRESIDENT

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