Document:

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                                                                   EXHIBIT 10.1

                              SANTERA SYSTEMS INC.
                            2003 EMPLOYEE BONUS PLAN

The 2003 Employee Bonus Plan ("2003 Bonus Plan") is designed to motivate
employees of Santera Systems Inc. ("Santera" or the "Company") and to reward
them for their continuing contributions to the Company's business if Santera
achieves certain financial results in the second half of 2003. The Company
believes that the achievement of these results is essential for the Company's
success.

2003 Bonus Plan:

Each Eligible Employee (as defined below) who earns a bonus by virtue of his or
her continuing employment with Santera will be eligible to receive a quarterly
bonus ("Quarterly Bonus") based on the Company's financial performance as
measured by the degree of the Company's attainment of a pre-set, Board of
Directors' approved, non-GAAP "operating income before bonus" goal for each of
the third and fourth calendar quarters of 2003.

The Quarterly Bonuses payable to an Eligible Employee under the 2003 Bonus Plan
will be calculated as a percentage of such employee's actual earnings paid
during a calendar quarter, excluding certain compensation and payments (e.g.,
reimbursement for moving expenses, bonus payments received under this Plan or
otherwise, stock option compensation, disability benefits, sign-on bonuses,
vacation cash-outs, on call pay, and similar payments).

Eligible Employees:

All full-time and part-time (as defined in Santera's Human Resources policy)
employees of Santera, other than Excluded Employees (as defined below), are
Eligible Employees for purposes of the 2003 Bonus Plan. The following employees
of Santera are Excluded Employees for purposes of the 2003 Bonus Plan:

        1. Commissioned employees;

        2. Employees who are expressly covered by another 2003 bonus plan of
           Santera or any of its affiliates;

        3. Casual, co-op or temporary employees; and

        4. Employees who are on a Performance Improvement Plan on the last day
           of a calendar quarter.

In order to earn and be eligible to receive a Quarterly Bonus, a person must be
employed by Santera as an Eligible Employee (i) throughout the entire calendar
quarter for which the bonus is payable; and (ii) on the date on which such
bonuses are paid, unless such requirements are waived in writing by the Chairman
of the Board of Directors of the Company, in his sole discretion. An employee's
eligibility under the 2003 Bonus Plan shall be determined on a
quarter-by-quarter basis. An employee who is on an approved leave of absence
from the Company during a calendar quarter will, for purposes of determining
eligibility under the 2003 Bonus Plan, be treated as being employed by the
Company during such leave of absence.

Quarterly Bonuses:

The Company's non-GAAP operating income before bonus (which excludes the effects
of acquisition-related amortization and other merger-related charges)
("Operating Income before Bonus") for each of the third and fourth calendar
quarters will be the financial measure for the Quarterly Bonuses. For purposes
of the 2003 Bonus Plan, "Operating Income" means revenues less cost of goods
sold and operating expenses.

The amount of bonus payable as a Quarterly Bonus to an Eligible Employee will be
calculated by multiplying (i) the product of such Eligible Employee's actual
earnings paid in a calendar quarter and the Quarterly Bonus Percentage for such
calendar quarter listed opposite such employee's grade in the Bonus
Participation Table below by (ii) the applicable Bonus Factor (as determined in
accordance with the matrix set forth in Schedule A attached hereto). Stated
mathematically, the amount of a Quarterly Bonus equals (AxB)xC, where A = an
Eligible Employee's actual earnings paid in a calendar quarter; B = the
applicable Quarterly Bonus Percentage; and C = the applicable Bonus Factor.

<PAGE>
                                                                   EXHIBIT 10.1

The amount of the Company's quarterly Operating Income before Bonus will
determine the applicable Bonus Factor. As indicated on Schedule A, minimum
quarterly Operating Income before Bonus will result in a Bonus Factor of 25%;
mid-point Operating Income before Bonus will result in a Bonus Factor of 50%;
and maximum quarterly Operating Income before Bonus will result in a maximum
Bonus Factor of 100%. There will be a linear increase in the percentage amount
of the Bonus Factor between (i) the minimum quarterly Operating Income before
Bonus and the mid-point Operating Income before Bonus; and (ii) the mid-point
Operating Income before Bonus and the maximum quarterly Operating Income before
Bonus.

Except as otherwise provided herein, the Quarterly Bonus will be payable in one
lump sum (subject to applicable withholding taxes and other applicable
deductions) within 30 days after the Company's quarterly results are publicly
announced. An Eligible Employee who is on an approved leave of absence from the
Company on the date on which Quarterly Bonuses are paid and thereafter returns
to active status as an Eligible Employee upon the end of such leave of absence,
will be paid a Quarterly Bonus to which he/she is otherwise entitled under this
2003 Bonus Plan within 30 days following his/her return to active status as an
Eligible Employee. An Eligible Employee who is on an approved leave of absence
from the Company on the date on which Quarterly Bonuses are paid and thereafter
fails to return to active status as an Eligible Employee upon the end of such
leave of absence, will forfeit his/her right to any Quarterly Bonus to which
he/she may otherwise be entitled for such quarter.

Bonus Participation Levels:

For purposes of determining an Eligible Employee's Quarterly Bonus under the
2003 Bonus Plan, the Quarterly Bonus Percentages (by calendar quarter) shall be
as follows:

<TABLE>
<CAPTION>
                                      Bonus Participation Table
                                      -------------------------

                                                Quarterly Bonus Percentage
                                                --------------------------
                              Grade                 Q3               Q4
                              -----                 --               --
                        <S>                        <C>               <C>
                              E-22                  72%              96%
                              E-21                  60               80
                              E-20                  48               64
                              E-19                  36               48
                              E-18                  30               40
                              E-17                  24               32
                              E-16                  24               32
                              E-15                  18               24
                              E-14                  18               24
                              E-13                  12               16
                              E-12                  12               16
                              E-11                  12               16
                              E-10                  12               16
                        N-6 through N-13            12               16

</TABLE><PAGE>
                                                                   EXHIBIT 10.2

August 1, 2003

Monty Johnson                 Via Fax (919.380.2063)and Federal Express
1250 Dogwood Drive
Greensboro, GA 30642

Dear Monty:

On behalf of Tekelec, I am pleased to offer you employment as President and
General Manager of our Network Signaling Division, on the terms and conditions
set forth in this letter. As President and General Manager, Network Signaling
Division, you will report directly to Tekelec's President and Chief Executive
Officer, will be principally responsible for Tekelec's Network Signaling
Division and will have such other duties and responsibilities as may be
delegated to you from time to time by the President and Chief Executive Officer.
If you accept this offer, your appointment as President and General Manager,
Network Signaling Division, will be effective August 11, 2003 ("start date").
Your compensation and benefits will be as follows:

1.      Your annual base salary will be $225,000 (i.e., $8,653.85 per bi-weekly
        period).

2.      You will be eligible to participate in Tekelec's 2003 Executive Officer
        Bonus Plan, under which you will be eligible to receive, in accordance
        with the terms of such Plan, (a) quarterly cash bonuses in amounts up to
        57.6% of your salary paid during the 2003 third quarter and 76.8% of
        your salary paid during the 2003 fourth quarter (based in each quarter
        on the Company's achievement of certain financial milestones) and (b) an
        annual bonus equal to 12% of your annual base salary earned during 2003
        if you achieve certain individual objectives during 2003. The terms of
        your participation in any bonus plans after 2003 will be subject to
        change and the approval of the Board of Directors of Tekelec.

3.      You will receive applicable benefits, including personal time off,
        health, dental, vision, long-term disability and life insurance, as are
        generally provided to Tekelec's executive officers.

4.      You will continue to be offered the opportunity to participate in
        Tekelec's Employee Stock Purchase Plan and 401(k) Plan.

5.      You will be covered by Tekelec's Officer Severance Plan (a copy of which
        is enclosed). For purposes of Section 4(a) of the Officer Severance Plan
        and notwithstanding anything to the contrary therein, your office and
        title as President and General Manager, Network Signaling Division, will
        be treated as the equivalent of Vice President.

6.      The Compensation Committee of Tekelec will grant to you nonstatutory
        stock options under Tekelec's 1994 Stock Option Plan (the "Plan") to
        purchase 100,000 shares of Tekelec Common Stock ("Options"), effective
        as of the later of your start date or the date of the Compensation
        Committee's action granting such options (the "grant date"). The
        exercise price of your Options

<PAGE>
                                                                   EXHIBIT 10.2

        will be equal to the closing price of Tekelec's Common Stock on the
        grant date (as reported in The Wall Street Journal on the first business
        day following the grant date). Your Options will vest and become
        exercisable cumulatively in 16 equal quarterly installments of 6,250
        shares each, with the first installment vesting on December 31, 2003 and
        one additional installment vesting on the last day of each calendar
        quarter thereafter as long as you remain an employee of Tekelec. Each
        installment of your Options will expire, to the extent previously
        unexercised, upon the earlier of four years from the date of vesting or
        a date not less than three months after you cease to be a Tekelec
        employee as determined in accordance with the terms of the Plan. The
        Options will in all respects be subject to the terms and provisions of
        the Plan and the stock option agreement evidencing the grant of the
        Options.

As with every Tekelec employee, you reserve the right to terminate your
employment at any time for any reason, and we similarly reserve the right to
terminate your employment at any time, with or without cause. We hope and
expect, however, that this will be a long and mutually beneficial relationship.

This letter agreement contains our entire understanding with respect to your
employment as Tekelec's President and General Manager, Network Signaling
Division. The provisions of this letter may be amended only by a writing signed
by you and Tekelec. If you have any questions about the meaning of any of the
terms or provisions included herein, please let me know at your earliest
convenience. This letter agreement shall be construed under the laws of
California.

Monty, we believe that Tekelec can provide you with opportunities for
professional growth and financial return. We look forward to working with you in
your new position and to a mutually fulfilling and rewarding relationship.

If this letter agreement is acceptable to you, then please acknowledge your
acceptance by signing and dating the enclosed copy of this letter agreement
where indicated below and then faxing (fax number: 818.880.0176) and returning
such signed copy to me for receipt no later than August 7, 2003.

Sincerely,

/s/ Fred Lax

Fred Lax
President and Chief Executive Officer

Acknowledged and Accepted:

/s/ Monty Johnson                       Date:    August 6, 2003
----------------------------------            ------------------------
     MONTY JOHNSON

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