Document:

<PAGE>   1
                                                                   Exhibit 10.16

EMPLOYMENT CONTRACT

between

            Net+Silicon Inc., USA
            411 Waverley Oaks Road
            Building 227
            Waltham
            Mass. 02452
            U.S.A.

                                       - hereinafter referred to as "Company" -

and

            Mr. Michael Evenson
            Lerchenstrasse 14
            71144 Steinenbronn
            Germany

                                 - hereinafter referred to as "Senior Manager" -

                                    RECITAL

     The Company and Senior Manager desire to enter into an Employment Agreement
setting forth the terms and conditions of Senior Manager's employment with the
Company.

                                   AGREEMENT

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
hereinafter set forth, the Company and Senior Manager agree as follows:

     1. EMPLOYMENT.

Form 7-8                                                                       1
<PAGE>   2
          (a)  Term. The Senior Manager shall be employed by the Company as Vice
          President and General manager responsible for the Company's business
          activities in Europe and the Industrial Automation Market worldwide
          (EIA). Specific responsibilities and to serve in such additional or
          different position or positions as the Company may determine in its
          sole discretion. This employment contract shall become effective on
          the date hereof, and is entered into for an indefinite period of time.
          The contract shall end without notice no later than at the end of the
          month in which the Senior Manager fulfills the conditions to receive
          state old age pension benefits unless earlier terminated as set forth
          herein.

          (b)  Duties and Responsibilities. Senior Manager will be reporting to
          Cornelius Peterson, President and shall be responsible for:

          -  Establishing European Operation with Sales, Support and Marketing.

          -  Develop the European Operation in line with Company objectives.

          -  Develop and operate the Company's Worldwide Industrial Automation
             Business via local Sales, Support and Marketing functions in
             Europe, ASIA and the Americas.

          -  Develop and accomplish a mutually agreeable business plan including
             products, marketing, sales budgets and profit and capital plan.
             This plan must be accepted by the company before it can be
             implemented and will be subject to regular review and updating to
             reflect the needs for profitability and growth with respect to
             prevailing business conditions.

          (c)  Controls. In performing these responsibilities Senior Manager
          must conform to the Company standard practices and controls for
          financial and contractual commitments, expenditures and obligations.

          (d)  Location. The initial principal location at which Senior Manager
          shall perform services for the Company shall be Germany. The Company
          reserves the right to transfer the Senior Manager to another place of
          work if this is necessary for business reasons and if such transfer
          can reasonably be imposed on the Senior Manager.

     2. Compensation.

          (a)  Base Salary. Executive shall be paid a base salary ("Base
Salary") at the annual rate of US$4807.69, payable in bi-weekly installments
consistent with Company's payroll practices which is equivalent to an annual
base salary of US$125,000.00. The annual Base Salary shall be reviewed on or
before January 1 of each year, unless Senior Manager's

Form 7-8                                                                       2

<PAGE>   3
employment hereunder shall have been terminated earlier pursuant to this
Agreement, starting on January 1st 2000 by the Executive Management group of
the Company to determine if such Base Salary should be changed for the
following year.

(b)  Commission. In addition to the Base Salary Senior Manager is entitled to
     an incentive package targeted at $125,000 per year at 100% of attainment
     of mutually accepted business and performance goals and targets. The yearly
     goals will be described in a separate agreement to be agreed on or before
     January 1st of each year. Attachment 1 contains the First year's goals.
     Commissions are paid monthly in the following month and will be guaranteed
     for the first three months at the following rate mo. 1 - 80%, mo. 2 and 3 -
     70% mo. A recoverable draw against commissions will be made available for
     the second three months, if requested by Senior Manager, at a rate of 50%
     of standard monthly commission ($125,000 : 12). The Company reserves the
     right to modify the Commission Plan at any time.

(c)  Payment.  Payment of all compensation to Senior Manager hereunder shall be
     made in accordance with the relevant Company policies in effect from time
     to time, including normal payroll practices, and shall be subject to all
     applicable employment and withholding taxes in Germany. By payment of the
     above remuneration all activities which the Senior Manager has to perform
     according to this contract shall be deemed compensated. In particular, the
     Senior Manager shall not be entitled to any additional compensation for
     overtime work.

          3.   Other Employment Benefits.

               (a)  Business Expenses.  Upon submission of itemized expense
statements in the manner specified by the Company, Senior Manager shall be
entitled to reimbursement for reasonable travel and other reasonable business
expenses duly incurred by Executive in the performance of his duties under this
Agreement.

               (b)  Benefit Plans.  Senior Manager shall be entitled to
participate in the Company's medical and dental plans, life and disability
insurance plans pursuant to their terms and conditions. Senior Manager shall be
entitled to participate in any other benefit plan offered by the Company to its
employees during the term of this Agreement (other than stock option or stock
incentive plans, which are governed by Section 3(d) below). Nothing in this
Agreement shall preclude the Company or any affiliate of the Company from
terminating or amending any employee benefit plan or program from time to time.

               (c)  Vacation.  Senior Manager shall be entitled to 2 weeks of
vacation for the first year and 3 weeks of paid vacation each subsequent year of
full employment, exclusive of legal holidays, as long as the scheduling of
Senior Manager's vacation does not interfere with the Company's normal business
operations.

Form 7-8                                                                       3
<PAGE>   4
               (d)  Stock Options. Senior Manager shall be awarded 40,000
stock options in NETsilicon. These options will be awarded on the date of the
new Company is established and vesting starts on the first day of employment.
The strike price of the options will be the same as that for the other senior
employees and that of the Initial Public Offering. The vesting will be over a
2-year period on a basis or 50% vested at the end of the first year and 100% at
the end of the second year. Senior manager is eligible to participate in the
Companies additional options programs such as annual performance options,
Employee stock purchase and 401k stock contributions by the Company. For all
design wins over the quota during the first 6 months of employment Senior
Manager will be given 500 additional stock options at the prevailing price as
set by the Board of Directors.

               (e)  No Other Benefits. Senior Manager understands and
acknowledges that the compensation specified in Sections 2 and 3 of this
Agreement shall be in lieu of any and all other compensation, benefits and
plans.

4.  Senior Manager's Business Activities. The Senior Manager shall devote his
full working time and ability to the Company's business. All other activity for
remuneration or activity which normally entitles to remuneration, including any
part time work, is prohibited unless the Company has given its prior written
consent. The Company shall grant such consent if the additional activity does
not adversely affect the Company's interests.

          5.  Termination of Employment.

Any notice of termination must be given in writing to be effective

               (a)  For Cause. Notwithstanding anything herein to the contrary,
the Company may terminate Senior Manager's employment hereunder for cause for
any one of the following reasons: (1) conviction of a felony, any act involving
moral turpitude, or a misdemeanor where imprisonment is imposed, (2) commission
of any act of theft, fraud, dishonesty, or falsification of any employment or
Company records, (3) improper disclosure of the Company's confidential or
proprietary information, (4) any action by the Senior Manager which has a
detrimental effect on the Company's reputation or business, (5) Senior Manager's
failure or inability to perform any reasonable assigned duties after written
notice from the Company of, and a reasonable opportunity to cure, such failure
or inability, (6) any breach of this Agreement, which breach is not cured within
ten (10) days following written notice of such breach, (7) a course of conduct
amounting to gross incompetence, (8) chronic and unexcused absenteeism, (9)
unlawful appropriation of a corporate opportunity, or (10) misconduct in
connection with the performance of any of Senior Manager's duties, including,
without limitation, misappropriation of funds or property of the Company,
securing or attempting to secure personally any profit in connection with any
transaction entered into on behalf of the Company, misrepresentation to the
Company, or any violation of law or regulations on Company premises or to which
the Company is subject. Upon termination of Senior Manager's employment with the
Company for cause, the Company shall be under no further obligation to Senior
Manager, except to pay all accrued but unpaid base salary and accrued vacation
to the date of termination thereof.

Form 7-8                                                                       4
<PAGE>   5
(b)  Without Cause. The Company may terminate Senior Manager's employment
     hereunder at any time without cause, provided, however, that Senior Manager
     shall be entitled to 6 months notice period. During this period Senior
     Manager will continue to discharge his responsibilities and be able to seek
     new employment. In case of such termination of this employment contract,
     the Company can, at any time, release the Senior Manager from his working
     duties until the end of the notice period. In such case the Company shall
     continue to pay to the Senior Manager his contractual remuneration in the
     amount of 6 Months of Base Salary in addition to accrued but unpaid Base
     Salary and accrued vacation, less deductions required by law, until the end
     of the notice period. Any outstanding vacation claim shall be credited by
     the such period of release. Such Payments to Senior Manager are due if, and
     only if, Senior Manager executes a valid and comprehensive release of any
     and all claims that the Senior Manager may have against the Company in a
     form provided by the Company and Senior Manager executes such form within
     seven (7) days of tender. If the Senior Manager terminates his employment
     hereunder he must give a minimum of three-(3) month notice period.

          (c)  Cooperation. After notice of termination, Senior Manager shall
cooperate with the Company, as reasonably requested by the Company, to effect a
transition of Senior Manager's responsibilities and to ensure that the Company
is aware of all matters being handled by Senior Manager.

     6.  Disability of Senior Manager. The Company may terminate this Agreement
without liability if Senior Manager shall be permanently prevented from properly
performing his essential duties hereunder with reasonable accommodation by
reason of illness or other physical or mental incapacity for a period of more
than [120] consecutive days.

     7.  Death of Senior Manager. In the event of the death of Senior Manager
during the Employment Period, the Company's obligations hereunder shall
automatically cease and terminate; provided, however, that within 15 days the
Company shall pay to Senior Manager's heirs or personal representatives Senior
Manager's Base Salary and accrued vacation accrued to the date of death.

     8.  Confidential Information and Invention Assignments. Senior Manager has
executed the Company Confidential Information and Invention Assignment Agreement
(See attachment 2-the "Confidential Information and Invention Assignment
Agreement"). The obligations under the Confidential Information and Invention
Assignment Agreement shall survive termination of this Agreement for any reason.

     9.  Exclusive Employment. During employment with the Company, Senior
Manager will not do anything to compete with the Company's present or
contemplated business, nor will he or she plan or organize any competitive
business activity. Senior Manager will not enter into any agreement which
conflicts with his duties or obligations to the Company. Senior Manager will not
during his employment, without the Company's express written consent, directly
or indirectly, solicit or encourage any employee, agent, independent contractor,
supplier, customer, consultant or any other person or company to terminate or
alter a relationship with the Company.

Form 7-8                                                                       5
<PAGE>   6
     10.  Assignment and Transfer. Senior Manager's rights and obligations under
this Agreement shall not be transferable by assignment or otherwise, and any
purported assignment, transfer or delegation thereof shall be void. This
Agreement shall inure to the benefit of, and be binding upon and enforceable by,
any purchaser of substantially all of Company's assets, any corporate successor
to Company or any assignee thereof.

     11.  Existing Obligations. Your start date is targeted at Oct 15, 1998 and
we understand that you have requirements to support you current employer in the
transition to their replacement staffing on a mutually agreeable basis. You are
authorized to fulfill whatever obligations are necessary to former employer
until December 31, 1998. Any such time spent on the behalf of former employer
will be taken without compensation to you by Company.

     12.  Miscellaneous

          (a)  Attorneys' Fees. Should either party hereto, or any heir,
personal representative, successor or assign of either party hereto, resort to
legal proceedings in connection with this Agreement or Senior Manager's
employment with the Company, the party or parties prevailing in such legal
proceedings shall be entitled, in addition to such other relief as may be
granted, to recover its or their reasonable attorneys' fees and costs in such
legal proceedings from the non-prevailing party or parties; provided, however,
that nothing herein is intended to affect the provisions of Section 12(l).

          (b)  Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of Germany.

          (c)  Entire Agreement. This Agreement incl. Attachment 1 and 2
contain the entire agreement and understanding between the parties hereto and
supersedes any prior or contemporaneous written or oral agreements,
representations and warranties between them respecting the subject matter
hereof.

          (d)  Amendment. This Agreement may be amended only by writing signed
by Senior Manager and by a duly authorized representative of the Company.

          (e)  Severability. If any term, provision, covenant or condition of
this Agreement, or the application thereof to any person, place or
circumstance, shall be held to be invalid, unenforceable or void, the remainder
of this Agreement and such term, provision, covenant or condition as applied to
other persons, places and circumstances shall remain in full force and effect.

          (f)  Construction. The headings and captions of this Agreement are
provided for convenience only and are intended to have no effect in construing
or interpreting this Agreement. The language in all parts of this Agreement
shall be in all cases construed according to its fair meaning and not strictly
for or against the Company or Senior Manager.

          (g)  Rights Cumulative. The rights and remedies provided by this
Agreement are cumulative, and the exercise of any right or remedy by either
party hereto (or by

Form 7-8                                                                       6
<PAGE>   7
its successor), whether pursuant to this Agreement, to any other agreement, or
to law, shall not preclude or waive its right to exercise any or all other
rights and remedies.

          (h)  Nonwaiver. No failure or neglect of either party hereto in any
instance to exercise any right, power or privilege hereunder or under law shall
constitute a waiver of any other right, power or privilege or of the same
right, power or privilege in any other instance. All waivers by either party
hereto must be contained in a written instrument signed by the party to be
charged and, in the case of the Company, by an officer of the Company (other
than Senior Manager) or other person duly authorized by the Company.

          (i)  Remedy for Breach; Attorney's Fees. The parties hereto agree
that, in the event of breach or threatened breach of any covenants of Senior
Manager, the damage or imminent damage to the value and the goodwill of the
Company's business shall be inestimable, and that therefore any remedy at law or
in damages shall be inadequate. Accordingly, the parties hereto agree that the
Company shall be entitled to injunctive relief against Senior Manager in the
event of any breach or threatened breach of any of such provisions by Senior
Manager, in addition to any other relief (including damages) available to the
Company under this Agreement or under law. The prevailing party in any action
instituted pursuant to this Agreement shall be entitled to recover from the
other party its reasonable attorneys' fees and other expenses incurred in such
action.

          (j)  Notices. Any notice, request, consent or approval required or
permitted to be given under this Agreement or pursuant to law shall be
sufficient if in writing, and if and when sent by certified or registered mail,
with postage prepaid, to Senior Manager's residence (as noted in the Company's
records), or to the Company's principal office, as the case may be.

          (k)  Assistance in Litigation. Senior Manager shall, during and after
termination of employment, upon reasonable notice, furnish such information and
proper assistance to the Company as may reasonably be required by the Company
in connection with any litigation in which it or any of its subsidiaries or
affiliates is, or may become a party; provided, however, that such assistance
following termination shall be furnished at mutually agreeable times and for
mutually agreeable compensation.

(l)  Disputes. Any controversy, claim or dispute arising out of or relating to
     this Agreement or the employment relationship, either during the existence
     of the employment relationship or afterwards, between the parties hereto,
     their assignees, their affiliates, their attorneys, or agents, shall be
     litigated solely in Germany. Each party (1) submits to the jurisdiction of
     such court, (2) waives the defense of an inconvenient forum, (3) agrees
     that valid consent to service may be made by mailing or delivery of such
     service to the party's last known address, if personal service delivery can
     not be easily effected, and (4) authorizes and directs the Agent to accept
     such service in the event that personal service delivery can not easily be
     effected.

Form 7-8                                                                       7

<PAGE>   8
     IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement
as of the date set forth below.

[COMPANY]                               Senior Manager,:

By:  /s/ Cornelius Peterson             By:  /s/  Michael Evensen
   --------------------------              --------------------------
Name:  Cornelius Peterson               Name:  Michael Evensen
Title: President NET+SILICON Division   Date:  October 1st 1998.

Date: October 1st 1998
     ------------------------

Form 7-8                                                             8
<PAGE>   9
                                  Attachment 1
                      Commission Incentive Goals for 1999

Q1 and Q1 1999  based on design wins as stated below and paid in accordance
with the same pratices as all other employees. If at the end of the first 3
months these goals are deemed by either party to be significantly unfair either
party can request a change in the goals and the request will be negotiated. The
incentive for the Design Wins will be paid at a rate of determined by the # of
wins at quota divided into the standard incentive for the quota period. A
design win is a PO for a development kit and a cancelable PO for the first
shipping year of chips.

<TABLE>
<S>                                <C>                 <C>
Business area                      Q1                  Q2

Europe New markets                 3                   7
IA Europe                          3                   5
IA Japan                           1                   3
IA USA                             7                   9

Total Design Win Goals             14                  24
----------------------------------------------------------
</TABLE>

Q3 and on  Based on attainment of EIA Revenue and operating profit mutually
agreeable goals.

Approved by

C Peterson     /s/ C Peterson

M Evensen      /s/ M Evensen

Date           Oct 1, 1998

Form 7-8                                                              9

<PAGE>   10
                                  Attachment 2
     NETsilicon Confidential Information and Invention assignment agreement

Form 7-8                                                                      10

<PAGE>   11
EMPLOYMENT CONTRACT REVISION #1
-------------------------------

between

                    Net+Silicon Inc., USA
                    [Address]

                                   - hereinafter referred to as "Company" -

and

                           Mr. Michael Evenson
                           [Address]

                                 - hereinafter referred to as "Senior Manager" -

The Following Sections of the Contract are replaced in the entirety by this
amendment.
2(a)
3(d)

Attachment 3, Sample NETsilicon Option Agreement is added.

              2. Compensation.

                  (a)  Base Salary. Executive shall be paid a base salary ("Base
Salary") at rate of US$10,416.67, payable in monthly which is equivalent to an
annual base salary of US$125,000.00. The annual Base Salary shall be reviewed on
or before January 1 of each year, unless Senior Manager's employment hereunder
shall have been terminated earlier pursuant to this Agreement, starting on
January 1st 2000 by the Executive Management group of the Company to determine
if such Base Salary should be changed for the following year.

                  (b)  Benefit Plans.  Until a GmbH German subsidiary has been
established Senior Manager shall provide his own medical etc insurance coverage.
Upon establishment of the German subsidiary, Senior Manager shall be entitled to
participate in the Company's medical and dental plans, life and disability
insurance plans pursuant to their terms and conditions. Senior Manager shall be
entitled to participate in any other benefit plan offered by the Company to its
employees during the term of this Agreement (other than stock option or stock
incentive plans, which are governed by Section 3(d) below). Nothing in this
Agreement shall preclude the Company or any affiliate of the Company from
terminating or amending any employee benefit plan or program from time to time.

Form 7-8                                                                       1

<PAGE>   12
                  (d)  Stock Options. Senior Manager shall be awarded 142,487
                       stock options in NETsilicon. These options will be
                       awarded on the date of NETsilicon's Initial public
                       offering and vesting will be 12.5% vested at IPO date,
                       12.5% vested at the end of the first year after the IPO
                       and 25% per year thereafter for the next three years. The
                       strike price of the options will be the same as that for
                       the other senior employees and that of the Initial Public
                       Offering. Senior manager is eligible to participate in
                       the Companies additional options programs such as annual
                       performance options, Employee stock purchase and 401k
                       stock contributions by the Company. For all design wins
                       over the quota during the first 6 months of employment
                       Senior Manager will be given 500 additional stock options
                       at the prevailing price as set by the Board of Directors.

                       In addition you have been awarded 13,333 Osicom stock
                       options at a strike price of $7 1/32. These option have
                       the standard osicom vesting.

     IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement as
of the date set forth below.

[COMPANY]                                 Senior Manager,:

By: /s/ Cornelius Peterson                By: /s/ Michael Evensen
   ------------------------                  ----------------------
Name: Cornelius Peterson                  Name: Michael Evensen
Title: President NET+SILICON
       Division

Date:  6/19/99                            June 19, 1999
---------------------------               -------------------------

Form 7-8                                                                       2<PAGE>   1
                                                                   EXHIBIT 10.17

                                                                      Par Chadha
                                                         Chief Executive Officer

June 18, 1999

Mr. Dan Sullivan
c/o NETsilicon, Inc.
411 Waverly Oaks Road, Suite 227
Waltham, MA 02154

VIA FEDEX

Dear Dan:

We propose that the following terms govern your continued employment as Chief
Financial Officer of NETsilicon, Inc.; if they are acceptable to you please
indicate your concurrence by signing at the place indicated below:

SALARY AND CONTINGENT COMPENSATION: Your base salary shall be increased to
$150,000 per calendar year, effective immediately upon your execution of this
letter agreement. In addition to your base salary, you shall receive a bonus to
be paid once per year, contingent upon NETsilicon's achievement of financial
milestones as set out in NETsilicon's annual operating plan and as approved by
the full board of NETsilicon prior to the fiscal year for which such bonus would
be due. The amount of your annual bonus shall have a maximum value equal to 40%
of your base salary at the commencement of the respective fiscal year. Pursuant
to the prior approval of NETsilicon's board, you may receive a pro rata share of
your maximum bonus at the end of such quarter or year to reflect NETsilicon's
partial achievement of its financial milestones as set out in the annual
operating plan. However, NETsilicon's board may specify minimum partial
milestones which NETsilicon must achieve in order for any pro rata portion of
your bonus to be paid. In the event that all or a majority share of NETsilicon,
Inc. is sold to an unaffiliated party, and you are an active participant in the
process whereby that share of NETsilicon, Inc., is sold, then you shall receive
one quarter (0.25) of one percent of the total value of that transaction and to
be paid in kind and at such time as Osicom Technologies receives its
consideration for that share. In the event of such a sale, any unvested options
to purchase the common stock of NETsilicon, Inc., which have been uncontingently
granted to you prior to the date upon which such sale becomes effective shall
immediately vest thereupon and you would have 90 days to exercise them and after
which they expire.

SEVERANCE FOLLOWING TERMINATION WITHOUT CAUSE: In the event that you are
terminated without cause, you shall continue to receive your medical benefits
and salary at a rate equal to your salary on the date of such termination for
the succeeding twelve months. You shall also have the right for 90 days
following the date of your termination to exercise any options to purchase the
common stock of Osicom Technologies, Inc. and or NETsilicon, Inc., that have
been uncontingently granted to you as of the date of your termination,
regardless of whether such options have been vested or not. In the

<PAGE>   2
event that you are terminated without cause, and [within the immediately
preceding six month period] Osicom Technologies has announced the cancellation
of the initial public offering of NETsilicon, Inc. (the "IPO"), then you shall
receive 12 months medical benefits and salary continuation as described above as
well as an additional one-time payment equal to your full annual salary at the
time of your termination. In the event that you are terminated without cause,
and Osicom Technologies has announced the cancellation of the IPO, and all or a
majority share of NETsilicon, Inc. has been sold to an unaffiliated party prior
to the date of your termination, and, you were an active participant in the
process whereby that share of NETsilicon, Inc., was sold, then you shall receive
twenty-five one hundredths of one percent (0.25) of the total value of that
transaction, and to be paid in kind and at such time as Osicom Technologies
receives its consideration for that share, if such consideration has not already
been paid as of the date of your termination.

VOLUNTARY SEPARATION: In the event that Osicom Technologies, Inc., has not
announced the cancellation of the IPO within the prior six months, and Osicom
Technologies, Inc., has not entered into a definitive agreement to sell all or a
majority share of NETsilicon, Inc., to an unaffiliated party, and if no
proceedings to terminate you with cause have been initiated, and you voluntarily
terminate your employment, then you shall receive your regular salary for twelve
months following the date of your voluntary termination. In addition, you shall
receive a one-time payment equal to 9 months salary at your then-applicable rate
of pay. However, if you voluntarily terminate your employment after an sale of
NETsilicon then you shall receive no severance.

REDUCTION IS RESPONSIBILITIES: In the event that a sale of all or a majority
share of NETsilicon has been completed and your responsibilities within 6
months after the sale are reduced as a result thereof, and you voluntarily
terminate your employment at NETsilicon, Inc., then you shall receive your
regular salary for twelve months following the date of your voluntary
termination.

Very truly yours,

/s/ Par Chadha
------------------
Par Chadha
PSC:ah
                                             /s/ Dan Sullivan
                                             -------------------------
                                                          Dan Sullivan

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