Document:

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                                                                   EXHIBIT 10.19

                           CHANGE IN CONTROL AGREEMENT

         THIS CHANGE IN CONTROL AGREEMENT (this "Agreement") is made as of this
30th day of December, 1999, between KLLM, Inc. ("KLLM"), and [NAME OF PERSON]
("Employee").

                                    RECITALS

         Employee is employed by KLLM. The Board of Directors of KLLM (the
"Board"), has determined that it is in the best interests of KLLM and its sole
shareholder, KLLM Transport Services, Inc. (the "Company") to assure that KLLM
will have the continued dedication of Employee, notwithstanding the possibility,
threat or occurrence of a Change in Control (as defined below) of the Company.
The Board believes it is imperative to diminish the inevitable distraction of
Employee by virtue of the personal uncertainties and risks created by a pending
or threatened Change in Control and to encourage Employee's full attention and
dedication to KLLM currently and in the event of any threatened or pending
Change in Control. Therefore, in order to accomplish these objectives, the Board
has caused KLLM to enter into this Agreement.

         NOW, THEREFORE, in consideration of the mutual promises set forth
below, in order to induce Employee to remain in the employ of KLLM, and to
provide continued services to KLLM now and in the event a Change of Control
occurs within the 12 month term hereof, this Agreement sets forth a Bonus, which
KLLM offers to pay to Employee in the event of a termination of employment
pursuant to those circumstances described in Section 3 below at the time and in
the manner prescribed herein.

                                    AGREEMENT

         1. EFFECTIVE DATE. This Agreement shall be effective as of the date
first noted above (the "Effective Date").

         2. PERFORMANCE OF SERVICE. Employee agrees to devote his or her full
business time, attention, skill and best efforts while at work exclusively to
the faithful performance of his or her duties assigned from time to time by
KLLM. The term of this Agreement shall commence immediately upon the date hereof
and continue for a period of twelve (12) months thereafter.

         3. BONUS PAYMENT. If Employee's employment with KLLM shall have
terminated within twelve (12) months after a Change in Control due to (i)
Employee's termination by KLLM without Cause (as defined below), or (ii)
Employee's resignation for Good Reason (as defined below), then KLLM will pay to
Employee a bonus (the "Bonus") equal to but not less than [PERCENTAGE OF GROSS
ANNUAL SALARY] of his gross annual salary, as of the Effective Date of this
Agreement, in cash, less applicable withholding of taxes. The Bonus shall be due
and payable on the date Employee's employment is terminated pursuant to clauses
(i) or (ii) above.

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         4. DEFINED TERMS.

         (i) CHANGE IN CONTROL. For the purposes of this Agreement, a "Change in
Control" shall mean the occurrence of any of the following events:

                  (a) Individuals who, at the Effective Date, constitute the
         Board of Directors of the Company (the "Incumbent Directors") cease for
         any reason to constitute at least a majority of the Company's Board,
         provided that any person becoming a director after the Effective Date
         and whose election or nomination for election was approved by a vote of
         at least a majority of the Incumbent Directors then on the Board
         (either by a specific vote or by approval of the proxy statement of the
         Company in which such person is named as a nominee for director,
         without written objection to such nomination) shall be an Incumbent
         Director; provided, however, that no Individual initially elected or
         nominated as a director of the Company as a result of an actual or
         threatened election contest (as described in Rule 14a-11 under the 1934
         Act ("Election Contest") or other actual or threatened solicitation of
         proxies or consents by or on behalf of any "person" (as such term is
         defined in Section 3(a)(9) of the 1934 Act and as used in Section
         13(d)(3) and 14(d)(2) of the 1934 Act) other than the Board ("Proxy
         Contest"), including by reason of any agreement intended to avoid or
         settle any Election Contest or Proxy Contest, shall be deemed an
         Incumbent Director;

                  (b) any person is or becomes a "beneficial owner" (as defined
         in Rule 13d-3 under the 1934 Act), directly or indirectly, of
         securities of the Company representing 15% or more of either (i) the
         then outstanding shares of common stock or (ii) the combined voting
         power of the Company's then outstanding securities eligible to vote for
         the election of the Board (the "Company Voting Securities"); provided,
         however, that the event described in this paragraph (b) shall not be
         deemed to be a Change in Control of the Company by virtue of any of the
         following acquisitions: (A) any acquisition by a person who is on the
         Effective Date the beneficial owner of 25% or more of the outstanding
         Company Voting Securities, (B) an acquisition by the Company which
         reduces the number of Company Voting Securities outstanding and thereby
         results in any person acquiring beneficial ownership of more than 25%
         of the outstanding Company Voting Securities; provided, that if after
         such acquisition by the Company such person becomes the beneficial
         owner of additional Company Voting Securities that increases the
         percentage of outstanding Company Voting Securities beneficially owned
         by such person by 5%, a Change in Control of the Company shall then
         occur, (C) an acquisition by any employee benefit plan (or related
         trust) sponsored or maintained by the Company or any Parent or
         Subsidiary, (D) an acquisition by an underwriter temporarily holding
         securities pursuant to an offering of such securities, (E) an
         acquisition pursuant to a Non-Qualifying Transaction (as defined in
         paragraph (c) below), or (F) a transaction (other than the one
         described in paragraph (c) below) in which Company Voting Securities
         are acquired from the Company, if a majority of the Incumbent Directors
         approve a resolution providing expressly that the acquisition pursuant
         to this clause (F) does not constitute a Change in Control of the
         Company under this paragraph (b);

                  (c) the consummation of a reorganization, merger,
         consolidation, statutory share exchange or similar form of corporate
         transaction involving the Company that requires the approval of the
         Company's stockholders, whether for such transaction or the issuance of
         securities in the transaction (a "Reorganization"), or the sale or
         other disposition of all or substantially all of the Company's assets
         to an entity that is not an affiliate of the Company (a "Sale"), unless
         immediately following such Reorganization or Sale: (A) more than 50% of
         the total voting power of (x) the corporation resulting from such
         Reorganization or the corporation which has acquired all or
         substantially all of the assets of the Company (in either case, the
         "Surviving Corporation"), or (y) if applicable, the ultimate parent
         corporation that directly or indirectly has beneficial ownership of
         100% of the voting securities eligible to elect directors of the
         Surviving Corporation (the "Parent Corporation"), is represented by the
         Company Voting Securities that were outstanding immediately prior to
         such Reorganization or Sale (or, if applicable, is represented by
         shares into which such Company Voting Securities were converted
         pursuant to such Reorganization or Sale), and such voting power among
         the holders thereof is in substantially the same proportion as the
         voting power of such Company Voting Securities among the holders
         thereof immediately prior to the Reorganization or Sale, (B) no person
         (other than (x) the Company, (y) any employee benefit plan (or related
         trust) sponsored or maintained by the Surviving Corporation or the
         Parent Corporation, or (z) a person who immediately prior to the
         Reorganization or Sale was the beneficial owner of 25% or

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         more of the outstanding Company Voting Securities) is the beneficial
         owner, directly or indirectly, of 25% or more of the total voting power
         of the outstanding voting securities eligible to elect directors of the
         Parent Corporation (or, if there is no Parent Corporation, the
         Surviving Corporation), and (C) at least a majority of the members of
         the board of directors of the Parent Corporation (or, if there is no
         Parent Corporation, the Surviving Corporation) following the
         consummation of the Reorganization or Sale were Incumbent Directors at
         the time of the Board's approval of the execution of the initial
         agreement providing for such Reorganization or Sale (any Reorganization
         or Sale which satisfies all of the criteria specified in (A), (B) and
         (C) above shall be deemed to be a "Non-Qualifying Transaction").

         (ii) TERMINATION FOR CAUSE. For the purposes of this Agreement, "Cause"
includes but shall not be limited to: (a) conduct amounting to fraud or
dishonesty against the Company or any affiliate of the Company, including the
knowing failure to disclose or stop such dishonest conduct of others; (b)
inattention to or substandard performance by Employee of his/her duties; (c)
repeated absences from work without a reasonable excuse; (d) intoxication with
alcohol or drugs while on Company business during regular business hours; (e)
any conduct by Employee involving moral turpitude; (f) commission of a felony;
(g) a breach or violation by Employee of any material terms of this Agreement or
any other agreement to which Employee and the Company or any affiliate of the
Company are a party; or (h) any act or omission by Employee that is likely to
injure the reputation or Business of the Company or any affiliate of the
Company.

         (iii) RESIGNATION FOR GOOD REASON. For the purposes of this Agreement,
"Good Reason" shall mean:

                  (a) without the written consent of Employee, any action by
         KLLM that results in a material diminution in Employee's position,
         authority, duties or responsibilities, excluding for this purpose any
         action not taken in bad faith and which is remedied by KLLM promptly
         after receipt of notice thereof given by Employee;

                  (b) a material reduction by KLLM in Employee's Base Salary as
         in effect on the Effective Date or as the same may be increased from
         time to time; or

                  (c) without the written consent of Employee, KLLM's requiring
         Employee, to be based at any office or location more than [60] miles
         from the Jackson, Mississippi metropolitan area.

         5. INDIVIDUAL. For the purposes of this Agreement, any reference to an
individual includes a natural person, entity or group, and use of any masculine
pronoun in this Agreement is used for convenience only.

         6. NOTICE. Any notice required or permitted to be given by this
Agreement shall be effective only if in writing, delivered personally against
receipt therefor or mailed by certified or registered mail, return receipt
requested, to the parties at the addresses hereinafter set forth, or at such
other places that either party may designate by notice to the other.

                  Notice to the Company shall be addressed to:
                  KLLM, Inc.
                  P. O. Box 6098
                  Jackson, MS  39288
                  Facsimile No. (601) 936-5441
                  Attention:  Chairman

         Notice to Employee shall be addressed to him or her at the business
address of the Company where Employee is employed.

         All such notices shall be deemed effectively given five (5) days after
the same has been deposited in a post box

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under the exclusive control of the United States Postal Service.

         7. COUNTERPARTS. This Agreement may be executed in several
counterparts, each of which shall be deemed to be an original but all of which
together will constitute one and the same instrument.

         8. ARBITRATION. Any dispute or controversy between the parties relating
to this Agreement shall be settled by binding arbitration in the City of
Jackson, State of Mississippi pursuant to the governing rules of the American
Arbitration Association then in effect. Judgment may be entered on the
arbitrator's award in any court of competent jurisdiction.

         9. COSTS OF ENFORCEMENT. Each party shall pay its own legal fees and
expenses incurred in connection with any arbitration (or other proceeding
whether or not instituted by KLLM or Employee), relating to the interpretation
or enforcement of any provision of this Agreement (including any action seeking
to obtain or enforce any right or benefit provided by this Agreement).

         10. NO RESTRICTION ON EMPLOYMENT RIGHTS. This contract is in relation
to certain benefits and compensation only and is not to be construed as an
employment contract for a definite term. Nothing in this Agreement shall confer
on Employee any right to continue in the employ of KLLM or shall interfere with
or restrict the rights of KLLM, which are expressly reserved, to discharge
Employee at any time for any reason whatsoever, with or without Cause. Nothing
in this Agreement shall restrict the right of Employee to terminate his or her
employment with the Company at any time for any reason whatsoever.

         11. OTHER BENEFITS PAYABLE. The Bonus shall be payable in addition to,
and not in lieu of, all other accrued or vested earned but deferred
compensation, rights, options or other benefits which may be owed to Employee
following his discharge or resignation (whether or not contingent on any Change
of Control preceding termination), including but not limited to accrued vacation
or sick pay, amounts or benefits payable, if any, under any bonus or other
compensation plan, stock option plan, stock purchase plan, life insurance plan,
health plan, disability plan or similar plan.

         12. ASSIGNABILITY. This Agreement is binding on and is for the benefit
of the parties hereto and their respective successors, heirs, executors,
administrators and other legal representatives. Neither this Agreement nor any
right or obligation hereunder may be assigned by KLLM (except to any subsidiary
or affiliate) or by Employee.

         13. SUCCESSOR. KLLM shall require any successor (whether direct or
indirect, by purchase, merger, consolidation or otherwise) to all or
substantially all of the business and/or assets of KLLM or the Company to assume
expressly and agree to perform this Agreement in the same manner and to the same
extent that the Company would be required to perform. As used in this Agreement,
Company shall mean the company as hereinabove defined and any successor to its
business and/or assets as aforesaid which assumes and agrees to perform this
Agreement by operation of law or otherwise.

         14. AMENDMENT; WAIVER. This Agreement may be amended only by an
instrument in writing signed by the parties hereto, and any provision hereof may
be waived only by an instrument in writing signed by the party or parties
against whom or which enforcement of such waiver is sought. The failure of
either party at any time to require the performance by the other party of any
provision hereof shall in no way affect the full right to require such
performance at any time thereafter, nor shall the waiver by either party of a
breach of any provision hereof be taken or held to be a waiver of any succeeding
breach of such provision or a waiver of the provision itself or a waiver of any
other provision of this Agreement.

         15. VALIDITY. The invalidity or unenforceability of any provision or
provisions of this Agreement shall not affect the validity or enforceability of
any other provision of this Agreement, which shall remain in full force and
effect, nor shall the invalidity or unenforceability of a portion of any
provision of this Agreement affect the validity or enforceability of the balance
of such provision. If any provision of this Agreement, or portion thereof is so
broad, in scope or duration, as to

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be unenforceable, such provision or portion thereof shall be interpreted to be
only so broad as is enforceable.

         16. ENTIRE AGREEMENT. This Agreement contains the entire understanding
of the Company and Employee with respect to the subject matter hereof.

         17. APPLICABLE LAW. This Agreement shall be governed by and construed
in accordance with the substantive internal law and not the conflicts provision
of the State of Mississippi.

         IN WITNESS WHEREOF, the parties have executed these presents as of the
day and year first above written.

                                      KLLM, INC.

                                      By:
                                          ----------------------------------
                                      Title:
                                            --------------------------------

                                      EMPLOYEE

                                      --------------------------------------

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                           SCHEDULE TO EXHIBIT 10.19

The named executive officers listed below have each entered into the above
form Change in Control Agreement with KLLM, Inc., except that the name of each
such named executive officer appears as set forth below in the place of the
phrase "[NAME OF PERSON]" on page 1 of the form Change of Control Agreement
and the percentage of such named executive officer's gross annual salary agreed
to in such agreement appears as set forth in the place of the phrase
"[PERCENTAGE OF GROSS ANNUAL SALARY]" on page 1 of the form Change of Control
Agreement.

<TABLE>
<CAPTION>
                             Percentage
                              of Gross
Name                        Annual Salary
--------------              -------------
<S>                         <C>
Jack Liles                       200
Steven L. Dutro                  200
Nancy M. Sawyer                  200
</TABLE><PAGE>   1
                                                                   Exhibit 10.24

               FORM OF ADDENDUM TO EMPLOYMENT [LETTER][AGREEMENT]

      This Addendum (the "Addendum") to the Employment [Letter][Agreement]
dated __________, _____ [LIST ALL EMPLOYMENT LETTERS/AGREEMENTS] (together, the
"Agreement") has been entered into as of the 18th day of October, 1999, between
DIGITAL LIGHTWAVE, INC., a Delaware corporation (the "Company"), and
________________ ("Executive") to provide for the continued employment of
Executive on the additional terms and conditions set forth herein.

      WHEREAS, Executive has served as the _______________________ of the
Company since __________________ (the "Effective Date");

      WHEREAS, Executive and the Company wish to add non-competition and
severance provisions to the Agreement; and

      WHEREAS, the Company wishes to assure itself of the continued employment
efforts of Executive for the period provided in the Agreement, and Executive is
willing to continue to serve in the employ of the Company on a full-time basis
for said period upon the terms and conditions hereinafter provided.

      NOW, THEREFORE, in consideration of the mutual agreements herein
contained, intending to be legally bound, the Company and Executive agree as
follows:

      1.    Definition of Terms. The capitalized terms used herein and in the
Agreement shall have the meanings set forth in this Addendum, the Agreement or
in Appendix A hereto. Capitalized terms defined in this Addendum and in the
Agreement shall have the meanings assigned thereto in this Addendum.

      2.    Severance Benefits.

            (a)   Severance Benefits Upon Termination of Employment. In the
                  event Executive's employment terminates for any reason
                  (including the expiration of Executive's term of employment
                  with the Company) except to the extent provided in Section
                  2(b) of this Addendum in connection with a Change of Control,
                  then Executive shall be entitled to receive severance
                  benefits as follows:

                  (i)   Voluntary Resignation. If Executive's employment
                        terminates by reason of Executive's voluntary
                        resignation, then Executive shall not be entitled to
                        receive severance or other benefits.

                  (ii)  Involuntary Termination Other Than For Cause. If
                        Executive's employment is terminated as a result of an
                        Involuntary Termination other than for Cause, then the
                        following severance benefits shall be paid or otherwise
                        provided to Executive: (A) the Company shall pay to
                        Executive in the form of a lump sum payment, in cash, a
                        severance payment equal to the lesser of (x) one and
                        one half (1.5) times Executive's annual base salary for
                        the year in which a severance payment is payable, or
                        (y) one (1) times Executive's Current

<PAGE>   2

                        Compensation; provided, however, that if an executive
                        bonus plan has not been approved by the Company's
                        Compensation Committee in the year in which the
                        severance payment is payable, the severance payment
                        shall be as set forth in Section 2(a)(ii)(x) of this
                        Addendum; (B) for the one (1) year period following the
                        date of Executive's termination of employment, the
                        Company shall at its sole cost and expense provide
                        Executive (and Executive's eligible dependents, if any)
                        with life, disability, accident and group health
                        insurance benefits substantially similar to those
                        benefits that Executive (and Executive's dependents)
                        were receiving immediately prior to Executive's
                        termination of employment; provided, however, that the
                        benefits otherwise receivable by Executive pursuant to
                        this Section 2(a)(ii)(B) of this Addendum shall be
                        reduced to the extent comparable benefits are
                        concurrently received by Executive (or Executive's
                        dependents) pursuant to a similar plan or program of
                        another employer, and any such other benefits actually
                        received by Executive (or Executive's dependents) must
                        be reported to the Company; and provided further,
                        however, that the health care coverage provided by the
                        Company pursuant to this Section 2(a)(ii)(B) of this
                        Addendum shall be in lieu of any other continued health
                        care coverage to which Executive or Executive's
                        dependents would otherwise, at Executive's own expense,
                        be entitled in accordance with the requirements of
                        Internal Revenue Code of 1986, as amended ("Code"),
                        Section 4980B ("COBRA"), by reason of Executive's
                        termination of employment; (C) all stock options,
                        warrants, rights and other Company stock-related awards
                        granted to Executive by the Company, to the extent
                        vested, shall remain exercisable for the lesser of the
                        one (1) year period and the maximum period permissible
                        under the accounting regulations governing business
                        combinations following the date of Executive's
                        termination of employment, in accordance with the
                        provisions of the agreement evidencing such option
                        without regard to any shortening of such period as a
                        result of any termination of employment; and (D) the
                        Company shall pay or reimburse Executive for any and
                        all reasonable expenses incurred by Executive for
                        outplacement services selected by Executive until the
                        earlier of (I) the first anniversary of the date of
                        termination of employment or (II) the date on which
                        Executive commences employment with another employer,
                        provided however that in no event shall such services
                        exceed 35% of Executive's annual base salary as in
                        effect on the date hereof.

                  (iii) Termination for Cause. If Executive's employment is
                        terminated for Cause, then Executive shall not be
                        entitled to receive any severance payments or other
                        severance benefits under this Section 2 of this
                        Addendum. Executive's benefits will be continued under
                        the Company's then existing benefit plans and policies
                        in accordance with such plans and policies in effect on
                        the date of termination.

            (b)   Severance Benefits Upon a Change of Control. If Executive's
                  employment terminates within twelve (12) months following the
                  Change of Control by reason of an Involuntary Termination
                  other than for Cause, then the following benefits shall be
                  paid or otherwise provided to Executive: (i) the Company
                  shall pay to Executive, in the form of a lump sum payment, in
                  cash, a severance payment equal to the lesser of (A) two (2)
                  times Executive's annual base salary for the year in which a
                  severance payment is payable, or (B) one and one-half (1.5)
                  times Executive's Current Compensation; provided, however,
                  that if an executive bonus plan has not been approved by the
                  Company's Compensation Committee in the year in which the
                  severance payment is payable, the severance payment shall be
                  as set forth in Section 2(b)(i)(A) of this Addendum; (ii) for
                  the one and one-half (1.5) year period following the date of
                  Executive's termination of employment, the Company shall at
                  its sole cost and expense provide

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                  Executive (and Executive's eligible dependents, if any) with
                  life, disability, accident and group health insurance
                  benefits substantially similar to those benefits that
                  Executive (and Executive's dependents) were receiving
                  immediately prior to Executive's termination of employment;
                  provided, however, that the benefits otherwise receivable by
                  Executive pursuant to this Section 2(b)(ii) of this Addendum
                  shall be reduced to the extent comparable benefits are
                  concurrently received by Executive (or Executive's
                  dependents) pursuant to a similar plan or program of another
                  employer, and any such other benefits actually received by
                  Executive (or Executive's dependents) must be reported to the
                  Company; and provided further, however, that the health care
                  coverage provided by the Company pursuant to this Section
                  2(b)(ii) of this Addendum shall be in lieu of any other
                  continued health care coverage to which Executive or
                  Executive's dependents would otherwise, at Executive's own
                  expense, be entitled in accordance with the requirements of
                  Internal Revenue Code of 1986, as amended ("Code"), Section
                  4980B ("COBRA"), by reason of Executive's termination of
                  employment; (iii) all stock options, warrants, rights and
                  other Company stock-related awards granted to Executive by
                  the Company, to the extent vested, shall remain exercisable
                  for the lesser of the one (1) year period and the maximum
                  period permissible under the accounting regulations governing
                  business combinations following the date of Executive's
                  termination of employment, in accordance with the provisions
                  of the agreement evidencing such option without regard to any
                  shortening of such period as a result of any termination of
                  employment; and (iv) the Company shall pay or reimburse
                  Executive for any and all reasonable expenses incurred by
                  Executive for outplacement services selected by Executive
                  until the earlier of (I) the first anniversary of the date of
                  termination of employment or (II) the date on which Executive
                  commences employment with another employer, provided however
                  that in no event shall such services exceed 35% of
                  Executive's annual base salary as in effect on the date
                  hereof.

            (c)   Benefit Reduction. Should any of Executive's severance
                  benefits under this Section 2 of this Addendum and under the
                  Agreement (including any lump sum severance payment and any
                  accelerated vesting of outstanding options or shares of
                  stock) be deemed to be parachute payments under Code Section
                  280G, then, first, the dollar amount of any severance payment
                  and, secondly, the accelerated vesting of any options or
                  shares of stock, will be reduced to the extent (and only to
                  the extent) necessary to provide Executive with the maximum
                  after-tax benefit available, after taking into account any
                  parachute excise tax which might otherwise be payable by
                  Executive under Code Section 4999 and any analogous State
                  income tax provision. Any determination made under this
                  Section 3(C) shall be made by the Company's independent
                  auditors.

      3.    Death and Disability. Upon the death or disability of Executive,
all of Executive's outstanding options shall vest in full. Such options shall
remain exercisable for the lesser of the one (1) year period and the maximum
period permissible under the accounting regulations governing business
combinations following the date of Executive's death or disability, in
accordance with the provisions of the agreement evidencing such options.

      4.    Noncompetition and Confidential Information.

                                       3
<PAGE>   4

            (a)   Executive shall have executed the Company's standard Employee
                  Proprietary Information and Inventions Agreement and the
                  Employee Internal Confidentiality Agreement (together, the
                  "Confidentiality Agreement").

            (b)   In addition to the provisions of the Confidentiality
                  Agreement, which shall remain in full force and effect, for
                  the six (6) month period following the effective date of an
                  Involuntary Termination of Executive's employment with the
                  Company without Cause and for the one (1) year period
                  following the effective date of an Involuntary Termination
                  without Cause following a Change of Control, Executive will
                  not compete with the Company.

            (c)   Executive agrees that during any period when the provisions
                  of Section 4(b) above are in effect, Executive will not,
                  without the Company's express written consent, directly or
                  indirectly invest in any business which is competitive with
                  the Company (other than ownership of securities of publicly
                  held corporations of which Executive owns less than one
                  percent (1%) of any class of outstanding securities).

      5.    Consulting. Executive and the Company may, but are not required to,
            enter into an agreement pursuant to which Executive will provide
            consulting services to the Company after the date of Executive's
            retirement or termination. Any consulting fees paid to Executive
            will be in addition to any retirement or severance payments.

      6.    Successors. Any successor to the Company (whether direct or
            indirect and whether by purchase, lease, merger, consolidation,
            liquidation or otherwise) or to all or substantially all of the
            Company's business and/or assets shall assume the obligations under
            this Agreement and shall perform the obligations under this
            Agreement in the same manner and to the same extent as the Company
            would be required to perform such obligations in the absence of a
            succession. The terms of this Addendum and the Agreement and all of
            Executive's rights hereunder shall inure to the benefit of, and be
            enforceable by, Executive's personal or legal representatives,
            executors, administrators, successors, heirs, distributees,
            devisees and legatees.

      7.    Notice. Notices and all other communications contemplated by the
            Agreement shall be in writing and shall be deemed to have been duly
            given when personally delivered or when mailed by U.S. registered
            or certified mail, return receipt requested and postage prepaid.
            Mailed notices to Executive shall be addressed to Executive at the
            home address from which Executive most recently communicated to the
            Company in writing. In the case of the Company, mailed notices
            shall be addressed to its corporate headquarters, and all notice
            shall be directed to the attention of its Secretary.

      8.    Miscellaneous Provisions.

            (a)   No Duty to Mitigate. Executive shall not be required to
                  mitigate the amount of any payment contemplated by this
                  Addendum and the Agreement (whether by seeking new employment
                  or in any other manner), nor shall any such payment be
                  reduced by earnings that Executive may receive from any other
                  source, except as provided in this Agreement.

            (b)   Waiver. No provision of this Addendum or the Agreement shall
                  be modified, waived or discharged unless the modification,
                  waiver or discharge is agreed to in writing and

                                       4
<PAGE>   5

                  signed by Executive and by an authorized officer or
                  representative of the Company (other than Executive) and
                  approved by the Company's Board of Directors. No waiver by
                  either party of any breach of, or of compliance with, any
                  condition or provision of this Addendum or the Agreement by
                  the other party shall be considered a waiver of any other
                  condition or provision or of the same condition or provision
                  of another time.

            (c)   Whole Agreement. No agreements, representations or
                  understandings (whether oral or written and whether express
                  or implied) which are not expressly set forth in this
                  Addendum and the Agreement have been made or entered into by
                  either party with respect to the subject matter hereof.

            (d)   Choice of Law. The validity, interpretation, construction and
                  performance of this Agreement shall be governed by the laws
                  of the State of Florida.

            (e)   Severability. If any term or provision of this Addendum or
                  the Agreement or the application thereof to any circumstance
                  shall, in any jurisdiction and to any extent, be invalid or
                  unenforceable, such term or provision shall be ineffective as
                  to such jurisdiction to the extent of such invalidity or
                  unenforceability without invalidating or rendering
                  unenforceable the remaining terms and provisions of this
                  Addendum or the Agreement or the application of such terms
                  and provisions to circumstances other than those as to which
                  it is held invalid or unenforceable, and a suitable and
                  equitable term or provision shall be substituted therefor to
                  carry out, insofar as may be valid and enforceable, the
                  intent and purpose of the invalid or unenforceable term or
                  provision.

            (f)   Employment Taxes. All payments made pursuant to this Addendum
                  or the Agreement will be subject to withholding of applicable
                  income and employment taxes.

            (g)   Counterparts. This Addendum and the Agreement may be executed
                  in counterparts, each of which shall be deemed an original,
                  but all of which together will constitute one and the same
                  instrument.

            (h)   Conflict. This Addendum shall not in any manner affect any
                  provisions or benefits under, or reduce any benefits provided
                  to Executive under, the Agreement; provided, however, that,
                  to the extent that the same benefits are provided to
                  Executive under this Addendum and the Agreement, Executive
                  shall receive the maximum amount of benefits provided under
                  this Addendum or the Agreement, whichever is greater.

            (i)   Cooperation and Assistance. Executive shall, during and after
                  termination of employment, upon reasonable notice, provide
                  such information and assistance as may reasonably be required
                  by the Company in connection with any litigation, potential
                  litigation, or governmental inquiries or investigations;
                  provided, however, that any such assistance provided after
                  termination of employment shall be provided for reasonable,
                  mutually agreed compensation.

                                       5
<PAGE>   6

      IN WITNESS WHEREOF, the parties hereto have executed this Addendum this
day and year first above written.

DIGITAL LIGHTWAVE, INC.                  EXECUTIVE:

By:                                      By:
   -----------------------------------      -----------------------------------

                                       6
<PAGE>   7

                                   APPENDIX A

                                  DEFINITIONS

      Cause. "Cause" shall mean (i) material breach of any terms or obligations
under this Addendum or the Agreement, (ii) conviction of a felony, or (iii)
gross negligence or willful misconduct where such gross negligence or willful
misconduct has resulted or is likely to result in material damage to the
Company. Cause shall be determined in accordance with this definition at the
sole discretion of the Company's Board of Directors.

      Change of Control. "Change of Control" shall mean the occurrence of any
of the following events:

            (i)   if any "person" (as such term is used in Sections 13(d) and
      14(d) of the Securities Exchange Act of 1934, as amended (the "Exchange
      Act")), other than Dr. Bryan J. Zwan and/or his family and his
      affiliates, becomes the "beneficial owner" (as defined in Rule 13d-3
      under the Exchange Act), directly or indirectly, of securities of the
      Company representing fifty percent (50%) or more of the total combined
      voting power of the Company's then outstanding securities; or

            (ii)  the stockholders of the Company approve the merger or
      consolidation of the Company in which the Company is the acquired party,
      or the stockholders of the Company approve a plan of complete liquidation
      or dissolution of the Company or an agreement for the sale or disposition
      by the Company of all or substantially all of the Company's assets.

      Executive's Current Compensation. "Executive's Current Compensation"
shall mean (i) Executive's annual base salary for the year in which a severance
payment is payable, plus (ii) an amount equal to the target bonus payment in
any executive bonus plan approved by the Compensation Committee of Company's
Board of Directors for such year.

      Involuntary Termination. "Involuntary Termination" shall mean termination
by the Company of Executive's employment for any reason other than for Cause,
and shall include:

      (i)   Executive's voluntary resignation following (A) the material breach
by the Company of one or more of its obligations under this Addendum or the
Agreement which are not otherwise corrected within ten (10) days following
Executive's written notice to the Company of such breach, or (B) the occurrence
of any of the following events without Executive's express prior written
consent: (I) a change in Executive's title or a change in Executive's position
with the Company which reduces Executive's level of responsibilities, (II) a
reduction in Executive's then current level of compensation (including base
salary, benefits and any non-discretionary and objective-standard incentive
payment or bonus award), (III) a relocation of Executive's place of employment
by more than fifty (50) miles from Executive's current place of employment, or
(IV) the assignment of additional material job responsibilities or a reduction
in job responsibilities inconsistent with Executive's position with the Company
as a public company and Executive's prior responsibilities; and

      (ii)  the failure by the Company to renew Executive's term of Employment.

                                       7

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