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                                                                    EXHIBIT 10.1

                                PLANTRONICS, INC.
                     NON-EMEA QUARTERLY PROFIT-SHARING PLAN
                            Effective March 26, 2000

1.1    INTRODUCTION

       The Plantronics, Inc. Non-EMEA Quarterly Profit Sharing Plan is
       structured to provide associates in the North, Central and South America,
       Asia, and the Pacific region with an ability to share in company
       profitability based on their combined efforts. At the end of each
       quarter, adjusted Company profit will be determined and a bonus pool
       created using 5% of adjusted Company pre-tax profit. Funds in the pool
       will be disbursed to eligible associates according to their prorata
       eligible earnings for the quarter.

2.1    DEFINITIONS

<TABLE>
<S>                                 <C>
       Adjusted Profit              Consolidated Company pre-tax earnings and profits --
                                    including all expenses and changes other than i) federal
                                    and foreign tax and ii) extraordinary gains or losses as
                                    defined by the Financial Accounting Standards Board, and
                                    following an addback of profit sharing estimates
                                    previously expensed during the period.

       Beneficiary:                 Any legally entitled beneficiary to an employee's estate
                                    and corresponding entitlement to payment under the Plan,
                                    as established by Human Resources.

       Company:                     Plantronics, Inc. or a successor entity or corporation
                                    that may, at its sole discretion, choose to continue
                                    this Plan.

       Consultant:                  Any person who provides service to the Company under a
                                    Consulting Agreement with Plantronics, Inc. or through
                                    employment by an outside agency, contract service, or
                                    educational institution and who is so designated as a
                                    Consultant by Human Resources.

       Disability/Death:            A permanent medical condition that renders the associate
                                    unable to perform usual duties and requires the
                                    Participant to cease employment with the Company.  A
                                    Participant or Beneficiaries seeking Disability or Death
                                    benefits under this Plan shall be required to provide
                                    evidence and records as appropriate for Human Resources
                                    to determine whether Disability or Death have occurred.

       Effective Date:              The Effective Date of the Plan is March 26, 2000.

       Eligible Associate:          All active indirect Company employees providing service
                                    through a Participating Employer payroll except those
                                    designated as a Consultant by Human Resources.

       Eligible Earnings:           All current base compensation paid or payable in cash by
                                    the Participating Employer to a Participant for services
                                    performed during the Fiscal Quarter.  Compensation shall
                                    not include overtime, bonuses, severance, sales
                                    commissions, or other cash incentive payments, but will
                                    include vacation, disability pay and sick pay.
</TABLE>

<PAGE>   2

                                PLANTRONICS, INC.
                     NON-EMEA QUARTERLY PROFIT-SHARING PLAN
                            Effective March 26, 2000

<TABLE>
<S>                                 <C>
       Fiscal Quarter:              The stated Company quarterly financial accounting
                                    periods during each Fiscal Year ending on the Saturday
                                    closest to June 30, September 31, December 31 and March
                                    31 each year.

       Lay-off                      The termination of employment by the Company
                                    under an announced Layoff program due to
                                    lack of work or the re-positioning of work
                                    within the Company for which the employee
                                    has received severance payments from the
                                    Company, and as determined by Human
                                    Resources.

       Leave of Absence             An authorized leave of absence during the Fiscal Quarter
                                    that has been approved by Human Resources

       Participant:                 Any Eligible Associate who provides service to the
                                    Company during a Fiscal Quarter and is employed with the
                                    Company on the last day of the Fiscal Quarter.

       Participating Employers:     All non-EMEA subsidiaries and divisions and their
                                    payrolling agencies are the Participating Employers
                                    under this Plan. Non-EMEA organizations are those
                                    outside the Plantronics, Inc. Europe, Middle East, and
                                    Asia division -- including but not limited to locations
                                    in North America, Central and South America, Asia, and
                                    the Pacific region.

       Payroll Quarter:             The stated Participating Employer payroll period that
                                    corresponds to a Fiscal Quarter, as determined by the
                                    local Payroll or Human Resource Manager with such
                                    responsibility.

       Plan                         The Plantronics, Inc. Non-EMEA Quarterly Profit Sharing
                                    Plan.

       Retirement                   The associate's termination of employment based on
                                    company defined and allowed retirement from service,
                                    as determined by Human Resources.

       Transfer-In:                 The transfer of an Eligible Employee from an EMEA
                                    subsidiary or division payroll to a Non-EMEA subsidiary
                                    or division payroll.

       Transfer-Out:                The transfer of an Eligible Employee from a Non-EMEA
                                    subsidiary or division payroll to an EMEA subsidiary or
                                    division payroll.
</TABLE>

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                                PLANTRONICS, INC.
                     NON-EMEA QUARTERLY PROFIT-SHARING PLAN
                            Effective March 26, 2000

III.   ELIGIBILITY

       3.1    PARTICIPATION

              For each Fiscal Quarter following the Effective Date, a Non-EMEA
              associate is a Participant if they are considered an Eligible
              Associate on the last working day of the Fiscal Quarter. Eligible
              Earnings for each Participant during the quarter are determined
              based on prorated earnings during the Payroll Quarter, based on
              the Participant's actual payroll earnings in the Non-EMEA division
              or subsidiary. Payroll and Fiscal Quarters do not necessarily
              match the same time periods during a quarter.

       3.2    DEATH/DISABILITY/RETIREMENT/LAYOFF/LEAVE OF ABSENCE/TRANSFER-OUT

              Any Eligible Employee who ceases employment with the Company for
              reason of Death, Disability, Retirement, Layoff, Leave of Absence
              or Transfer-Out will be considered a Participant through the end
              of that Fiscal Quarter. Payment will be calculated based on the
              Eligible Earnings earned during that quarter.

       3.3    TRANSFER-IN

              Any Eligible Employee who Transfers-In during a Fiscal Quarter
              will have payment calculated based on the Eligible Earnings earned
              during that quarter from a Participating Employer.

       3.4    OTHER TERMINATING EVENTS

              Any Eligible Employee who ceases employment with the Company for
              reasons other than Death, Disability, Retirement, Layoff, or Leave
              of Absence during the Fiscal Quarter -- whether voluntary or
              involuntary -- will no longer be considered a Participant in the
              Plan.

IV.    PROFIT SHARING POOL FUNDING

       As soon as practicable at the end of any fiscal quarter and following
       review of financial statements by an independent accounting firm, a
       profit sharing pool will be funded by the Company in an amount equal to
       5% of Adjusted Profit for distribution under this Plan.

V.     METHOD OF CALCULATION

       Once the Profit Sharing Pool is created, these funds are allocated to
       individual Participants, based on their prorata share of total Eligible
       Earnings. The method for determining the individual allocation shall be
       the Eligible Earnings paid to a Participant during the Fiscal Quarter
       divided by the aggregate Eligible Earnings paid to all Participants
       during the same Fiscal Quarter.

VI.    METHOD OF PAYMENT

       Upon completion of appropriate calculations and approval to proceed, each
       Participating Employer will pay to the Participant the amount determined
       under the Method of Calculation in a cash payment, subject to any locally
       required tax withholding. Payment will be made as soon as practicable
       following the completion of the review of Fiscal Quarter financials by an
       independent accounting firm.

<PAGE>   4

                                PLANTRONICS, INC.
                     NON-EMEA QUARTERLY PROFIT-SHARING PLAN
                            Effective March 26, 2000

VII.   ADMINISTRATION COMMITTEE

       An internal Administration Committee consisting of the Chief Executive
       Officer, Chief Financial Officer and each Participating Employer Human
       Resource and Payroll Manager administers the Plan. The Company
       indemnifies the committee members from all liability or claim against
       them.

VIII.  PLAN AMENDMENT OR TERMINATION

       The Plan can be amended or terminated by the Administration Committee at
       any time, for any reason, either retroactively or prospectively.

IX.    RIGHTS AND CLAIMS UNDER THE PLAN

       The Company intends to make contributions to the Plan indefinitely,
       however, the Company is not under any obligation or liability to continue
       its contributions to the Plan or to maintain the Plan for any given
       length of time. The Company may discontinue contributions or terminate
       the Plan with respect to all or part of the Participating Associates at
       any time.

       Any payment to a Participant or his/her Beneficiary, in accordance with
       the Plan, shall to the extent thereof be in full satisfaction of all
       claims such person may have against the Company. The Company may require
       the Participant or Beneficiary to execute a receipt and release as a
       condition precedent to payment, in a manner determined by the
       Administrative Committee.

       Neither the establishment of the Plan, nor any modification thereof, nor
       the creation of any fund or payment from such fund shall be construed so
       as to grant a Participant any legal or equitable right or any presumed
       contract of employment with the Company.<PAGE>   1

                                                                 EXHIBIT 10.4(a)

[PLANTRONICS LOGO]

HUMAN RESOURCE ADMINISTRATIVE GUIDE

                                                                       No. H0xxx
                                                                  Rev 3.0 7/1/00

                    REGULAR AND SUPPLEMENTAL BONUS GUIDELINES

1.0    PURPOSE

       The following Bonus guidelines shall apply to Fiscal Year 2001 and
       subsequent fiscal years, unless amended. These guidelines will determine
       how regular and supplemental bonuses are administered and calculated.

2.0    SCOPE

       Selected employees may be eligible to participate in the Plantronics,
       Inc. Regular and/or Supplemental Bonus Plan. Participants must receive
       appropriate approval, as designated by the Company's signature authority
       policy.

3.0    GENERAL

       Plantronics has introduced numerous forms of variable compensation to
       incent employees to achieve. The regular and supplemental bonus plans
       were created to reward performance against documented objectives.

4.0    GUIDELINE

       To become a Participant in the Regular or Supplemental Bonus Plan, an
       associate must receive confirmation by way of a fully executed offer
       letter or pay adjustment memo, received from the Human Resource
       department.

       The Regular and Supplemental Bonus Plan targets bonus amounts for
       participants as a percentage of base salary. Target base salary for the
       regular bonus plan is computed as one quarter of the ending pay rate.
       Payout of the regular bonus will be made on a quarterly basis -- 25% of
       the bonus target percentage each quarter times the individual performance
       score. Target base salary for the supplemental bonus plan is computed
       based on actual salary earned for the year. Actual payment is based on
       company and individual performance scores. The Supplemental Bonus is paid
       following the close of the fiscal year.

       Supplemental Bonus Plan is paid only on the basis of relative achievement
       against the Board approved plan for adjusted net income excluding
       one-time gains/losses from sales of capital assets and write-offs. Should
       adjusted net income fall below the Board-approved plan, supplemental
       bonus payments will be reduced proportionately, i.e., 95% achievement of
       net income funds a pool equal to 95% of target bonuses. Each participant
       will receive payment only to the extent of actual accomplishment of
       individual objectives.

       NO SUPPLEMENTAL BONUS WILL BE PAID IF RESULTS WERE LOWER THAN THE RESULTS
       FROM THE PRIOR YEAR. MAXIMUM PAYOUT FOR ANY INDIVIDUAL IS 100% OF TARGET.

<TABLE>
<CAPTION>
                    --------------------------------------------
                    EXAMPLE:                        FISCAL YEAR
                    --------------------------------------------
<S>                                                 <C>
                    Fiscal Year Base Salary             $150,000
                    --------------------------------------------
                    Bonus Percentage                         20%
                    --------------------------------------------
                    Target Supplemental Bonus             30,000
                    --------------------------------------------
                    Company Performance                      96%
                    --------------------------------------------
                    Personal Performance                     80%
                    --------------------------------------------
                    Payout                               $23,040
                    --------------------------------------------
</TABLE>

                                       1
<PAGE>   2

[PLANTRONICS LOGO]

HUMAN RESOURCE ADMINISTRATIVE GUIDE

                                                                       No. H0xxx
                                                                  Rev 3.0 7/1/00

                    REGULAR AND SUPPLEMENTAL BONUS GUIDELINES

       The actual Regular Bonus payment is based upon the attainment of
       individual objectives, as determined. Payouts will be made using an
       actual performance factor (0% to 100% of target) as determined by the
       supervisor, department Vice President, and/or the CEO, and based upon the
       participant's achievement of goals and objectives.

       For example, assume a participant earns $100,000 per year and is targeted
       to earn a 20% Regular Bonus. If the participant receives a 4% increase in
       Q2 and achieved objective factors of 80% in Q1, 85% in Q2, 90% in Q3 and
       85% in Q4, the bonus would be calculated as follows:

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------
                                           Q1          Q2             Q3            Q4
------------------------------------------------------------------------------------------
<S>                                    <C>          <C>            <C>           <C>
Fiscal Year Base Salary                $100,000     $104,000       $104,000      $104,000
------------------------------------------------------------------------------------------
Bonus Percentage                            20%          20%            20%           20%
------------------------------------------------------------------------------------------
Maximum Quarterly Bonus                   5,000        5,200          5,200         5,200
------------------------------------------------------------------------------------------
Personal Performance Factor                 80%          85%            90%           85%
------------------------------------------------------------------------------------------
Quarterly Payout                          4,000        4,420          4,680         4,420
------------------------------------------------------------------------------------------
Maximum Year-to-Date Bonus                5,000       10,000         15,000        20,000
------------------------------------------------------------------------------------------
CUMULATIVE ANNUAL PAYOUT                 $4,000       $8,420        $13,100       $17,520
------------------------------------------------------------------------------------------
</TABLE>

       Regular Bonuses will be paid as soon as practicable following the close
       of a quarter.

       A participant must be employed by Plantronics on the payment date to be
       eligible. If not employed on the payment date, the participant shall not
       be entitled to any funds. If the participant dies, or is disabled and
       therefore unable to work during the relevant quarter or prior to the
       payment date, the participant will be treated as being employed on the
       payment date and the participant or the participant's estate will be
       entitled to the portion of the quarterly bonus actually earned on a pro
       rata basis using the time actually worked during the relevant quarter.

                                       2

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