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                                                                    EXHIBIT 10.1

                                   AGREEMENT

         This Agreement, made as of the 30th day of May, 1996 by and between
TOLLGRADE COMMUNICATIONS, INC., a Pennsylvania corporation (the "Corporation")
and SARA M. ANTOL, an individual residing in the Commonwealth of Pennsylvania
and an employee of the Corporation (the "Executive").

                                  WITNESSETH:

         WHEREAS, the Board of Directors of the Corporation has determined that
it is in the best interests of the Corporation to enter into this Agreement
with the Executive to provide for compensation of the Executive upon
termination of employment under certain circumstances relating to a change in
control of the Corporation; and

         WHEREAS, the Executive desires to obtain such benefits in the event
the Executive's employment is terminated under the circumstances provided
herein.

         NOW, THEREFORE, in consideration of the covenants and premises
contained herein, and intending to be legally bound hereby, the parties hereto
agree as follows:

         1.    DEFINITION OF TERMS.  The following terms when used in this
Agreement shall have the meaning hereafter set forth:

         "ANNUAL SALARY ADJUSTMENT PERCENTAGE" shall mean the mean average
         percentage increase in base salary for all elected officers of the
         Corporation during the two full calendar years immediately preceding
         the time to which such percentage is being applied; provided however,
         that if after a Change-in-Control, as hereinafter defined, there
         should be a significant change in the number of elected officers of
         the Corporation or in the manner in which they are compensated, then
         the foregoing definition shall be changed by substituting for the
         phrase "elected officers of the Corporation" the phrase "persons then
         performing the functions formerly performed by the elected officers of
         the Corporation."

         "CAUSE FOR TERMINATION" shall mean:

         (a)      the deliberate and intentional failure by the Executive to
                  devote substantially her entire business time and best
                  efforts to the performance of her duties (other than any such
                  failure resulting from the Executive's incapacity due to
                  physical or mental illness or disability) after a demand for
                  substantial performance is delivered to the Executive by the
                  Board of Directors which specifically identifies the manner
                  in which the Board of Directors believes that the Executive
                  has not substantially performed her duties,

               or

         (b)      wilfully engaging by the Executive in conduct which
                  constitutes a fraud against the Corporation or a material
                  breach of this Agreement,

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               or

         (c)      the Executive's conviction of any crime which constitutes a
                  felony.

         For purposes of this definition, no act, or failure to act, on the
         Executive's part shall be considered "deliberate and intentional" or
         "willfully" unless done, or omitted to be done, by the Executive not
         in good faith and without reasonable belief that her action or
         omission was in the best interests of the Corporation.

         "CHANGE-IN-CONTROL" shall mean the determination (which may be made
         effective as of a particular date specified by the Board of Directors
         of the Corporation) by the Board of Directors of the Corporation, made
         by a majority vote that a change in control has occurred, or is about
         to occur. Such a change shall not include, however, a restructuring,
         reorganization, merger, or other change in capitalization in which the
         Persons who own an interest in the Corporation on the date hereof (the
         "Current Owners")(or any individual or entity which receives from a
         Current Owner an interest in the Corporation through will or the laws
         of descent and distribution) maintain more than a sixty-five percent
         (65%) interest in the resultant entity. Regardless of the Board's vote
         or whether or not the Board votes, a Change-in-Control will be deemed
         to have occurred as of the first day any one (1) or more of the
         following subparagraphs shall have been satisfied:

         (a)      Any Person (other than the Person in control of the
                  Corporation as of the date of this Agreement, or other than a
                  trustee or other fiduciary holding securities under an
                  employee benefit plan of the Corporation, or a corporation
                  owned directly or indirectly by the stockholders of the
                  Corporation in substantially the same proportions as their
                  ownership of stock of the Corporation), becomes the
                  beneficial owner, directly or indirectly, of securities of
                  the Corporation representing more than thirty five percent
                  (35%) of the combined voting power of the Corporation's then
                  outstanding securities; or

         (b)      The stockholders of the Corporation approve:

                  (i)         A plan of complete liquidation of the Corporation;

                  (ii)        An agreement for the sale or disposition of all
                              or substantially all of the Corporation's assets;
                              or

                  (iii)       A merger, consolidation, or reorganization of the
                              Corporation with or involving any other
                              corporation, other than a merger, consolidation,
                              or reorganization that would result in the voting
                              securities of the Corporation outstanding
                              immediately prior thereto continuing to represent
                              (either by remaining outstanding or by being
                              converted into voting securities of the surviving
                              entity) at least sixty-five percent (65%) of the
                              combined voting power of the voting securities of
                              the Corporation (or such surviving entity)
                              outstanding immediately after such merger,
                              consolidation, or reorganization.

         However, in no event shall a Change in Control be deemed to have
         occurred, with respect to the Executive, if the Executive is part of a
         purchasing group which consummates the Change-in- Control transaction.
         The Executive shall be deemed "part of the purchasing group" for
         purposes

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         of the preceding sentence if the Executive is an equity participant or
         has agreed to become an equity participant in the purchasing company
         or group (except for (i) passive ownership of less than five percent
         (5%) of the voting securities of the purchasing company; or (ii)
         ownership of equity participation in the purchasing company or group
         which is otherwise deemed not to be significant, as determined prior
         to the Change-in-Control by a majority of the non-employee continuing
         Directors of the Board of Directors of the Corporation).

         "DATE OF TERMINATION" shall mean:

         (a)      if the Executive's employment is terminated for Disability,
                  the date that a Notice of Termination is given to the
                  Executive;

         (b)      if the Executive terminates due to her death or Retirement,
                  the date of death or Retirement, respectively;

         (c)      if the Executive decides to terminate employment upon Good
                  Reason for Termination, the date following such decision
                  specified by the Corporation after it has been notified of
                  the Executive's decision to terminate employment; or

         (d)      if the Executive's employment is terminated for any other
                  reason, the date on which such termination becomes effective
                  pursuant to a Notice of Termination.

         "DISABILITY" shall mean such incapacity due to physical or mental
         illness or injury as causes the Executive to be unable to perform
         herduties with the Corporation during 180 consecutive days.

          "GOOD REASON FOR TERMINATION" shall mean the occurrence of:

         (a)      without the Executive's express written consent, the
                  assignment to the Executive of any duties materially and
                  substantially inconsistent with her positions, duties,
                  responsibilities and status with the Corporation immediately
                  prior to a Change-in-Control, or a material change in her
                  reporting responsibilities, titles or offices as in effect
                  immediately prior to a Change-in-Control, or any removal of
                  the Executive from or any failure to re-elect the Executive
                  to any of such positions, except in connection with the
                  termination of the Executive's employment due to Cause for
                  Termination, Disability or Retirement (as hereinafter
                  defined) or as a result of the Executive's death;

         (b)      (i) a reduction by the Corporation prior to a
                  Change-in-Control in the Executive's base salary unless such
                  reduction is the result of the Board of Directors of the
                  Corporation determining that the Executive has not adequately
                  discharged herduties;

                  (ii) a reduction by the Corporation after a Change-in-Control
                  in the Executive's base salary as in effect immediately prior
                  to any Change-in-Control or a failure by the Corporation
                  after a Change-in-Control to increase the Executive's base
                  salary by the Annual Salary Adjustment Percentage;

         (c)      a failure by the Corporation to continue to provide incentive
                  compensation comparable to that provided by the Corporation
                  immediately prior to any Change-in-Control;

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         (d)      a failure by the Corporation after a Change-in-Control to
                  continue in effect any benefit or compensation plan, stock
                  option plan, pension plan, life insurance plan, health and
                  accident plan or disability plan in which the Executive is
                  participating immediately prior thereto (provided, however,
                  that there shall not be deemed to be any such failure if the
                  Corporation substitutes for the discontinued plan, a plan
                  providing the Executive with substantially similar benefits)
                  or the taking of any action by the Corporation which would
                  adversely affect the Executive's participation in or
                  materially reduce the Executive's benefits under any of such
                  plans or deprive the Executive of any material fringe benefit
                  enjoyed by the Executive immediately prior to a
                  Change-in-Control (provided, however, that any act or failure
                  to act by the Corporation that is on a plan-wide basis, i.e.,
                  it similarly affects all employees of the Corporation or all
                  employees eligible to participate in any such plan, as the
                  case may be, shall not constitute Good Reason for
                  Termination);

         (e)      the failure of the Corporation to obtain the assumption of
                  this Agreement by any successor as contemplated in SECTION
                  10(C) hereof;

         (f)      any purported termination of the employment of the Executive
                  by the Corporation which is not (i) due to the Executive's
                  Disability, Retirement (as hereinafter defined) or Cause for
                  Termination, or (ii) effected as a Notice of Termination, as
                  defined herein; or

         (g)      the Corporation's requiring the Executive to be based
                  anywhere other than the Corporation's executive offices at
                  which the Executive has her principal office immediately
                  prior to a Change-in-Control or executive offices located
                  within 50 miles of the location of the Corporation's
                  executive offices immediately prior to a Change-in-Control,
                  except for required travel on the Corporation's business to
                  an extent substantially consistent with the Executive's
                  present business travel obligations.

         "NOTICE OF TERMINATION" shall mean a written statement which sets
         forth the specific reason for termination and, if such is claimed to
         be a Cause for Termination or Good Reason for Termination, in
         reasonable detail the facts and circumstances which indicate that such
         is Cause for Termination or Good Reason for Termination.

         "OPTIONS" shall mean any stock options issued pursuant to any present
         or future stock option plan of the Corporation.

         "PERSON" shall have the meaning ascribed to such term in Section
         3(a)(9) of the Securities Exchange Act of 1934, as in effect on the
         date hereof and used in Sections 13(d) and 14(d) thereof, including a
         "group" as defined in Section 13(d) thereof.

         "RETIREMENT" shall mean the termination of the Executive's employment
         after age 65 or in accordance with any mandatory retirement
         arrangement with respect to an earlier age agreed to by the Executive.

         "STOCK APPRECIATION RIGHT" shall mean any stock appreciation rights
         issued pursuant to any stock option plan of the Corporation or any
         future stock appreciation rights plan.

         2.    TERMS OF EMPLOYMENT.  The Executive acknowledges that this
Agreement does not constitute an employment contract and that the Executive's
employment relationship with the

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Corporation is at-will and not for any particular period. Rather, this
Agreement is only intended to set forth certain liquidated damages to be paid
in the event of termination of the Executive upon the terms and conditions
specified herein.

         3. TERM OF AGREEMENT. The initial term of this Agreement shall be for
a period of four (4) years. Upon expiration of the initial term, the Company
shall, in its sole discretion, determine whether this Agreement shall be
renewed upon such terms it deems advisable.

         4. PAYMENTS FOLLOWING TERMINATION OF EMPLOYMENT UPON A
CHANGE-IN-CONTROL.

         (a)      If the Executive's employment with the Corporation shall be
                  terminated:

                  (i)      due to the Executive's death,

                  (ii)     by the Executive other than the Executive's having
                           terminated for Good Reason for Termination following
                           a Change-in-Control, or

                  (iii)    by the Corporation due to Cause for Termination or
                           for Disability or Retirement, then the Corporation
                           shall have no obligations to the Executive other
                           than to pay the Executive any unpaid portion of base
                           salary due until the Date of Termination and any
                           other sums due in accordance with the then various
                           policies, practices and benefit plans of the
                           Corporation.

         (b)      If the Executive's employment with the Corporation shall have
                  terminated during the period commencing six months prior to
                  the date of a Change-in-Control and ending on the third
                  anniversary of a Change-in-Control other than in the
                  circumstances described in subsection (a) above, then the
                  Corporation shall pay on or before the fifth day following
                  the Date of Termination (or if the Date of Termination
                  preceded the date of the Change-in-Control, on or before the
                  fifth day following the date of the Change-in-Control), to
                  the Executive the following sums:

                  (i)      in cash any unpaid portion of the Executive's full
                           base salary for the period from the last period for
                           which the Executive was paid to the Date of
                           Termination, or the date of the Change-in-Control,
                           as the case may be; and

                  (ii)     an amount in cash as liquidated damages for lost
                           future renumeration equal to the product obtained by
                           multiplying

                  (A)      the lesser of

                           (1)      two, or

                           (2)      a number equal to the number of calendar
                                    months remaining from the Date of
                                    Termination to the date on which the
                                    Executive is 65 years of age (or, if
                                    earlier, the age agreed to by the Executive
                                    pursuant to any prior arrangement) divided
                                    by twelve, or

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                           (3)      a number equal to the greater of (i) one
                                    (1.0) and (ii) thirty six (36) less the
                                    number of completed months commencing after
                                    the date of the Change-in-Control during
                                    which the Executive was employed by the
                                    Corporation and did not have Good Reason
                                    for Termination times (iii) one-twelfth
                                    (1/12) times

                  (B)      the sum of

                           (1)      the greater of

                                    (i)     the Executive's annual base salary
                                            for the year in effect on the Date
                                            of Termination (provided that in
                                            the case of Termination for Good
                                            Reason by the Executive the date
                                            immediately preceding the date of
                                            the earliest event which gave rise
                                            to the Termination for Good Reason
                                            by the Executive shall be used
                                            instead of the Date of Termination)

                                    or

                                    (ii)    the Executive's annual base salary
                                            for the year in effect on the date
                                            of the Change-in-Control;

                           plus

                           (2)      the greater of

                                    (i)     the average annual cash award
                                            received by the Executive as
                                            incentive compensation or bonus for
                                            one calendar year immediately
                                            preceding the Date of Termination
                                            (provided that in the case of
                                            Termination for Good Reason by the
                                            Executive the date immediately
                                            preceding the date of the event
                                            which gave rise to the Termination
                                            for Good Reason by the Executive
                                            shall be used instead of the Date
                                            of Termination)

                                    or

                                    (ii)    the average annual cash award
                                            received by the Executive as
                                            incentive compensation or bonus for
                                            one calendar year immediately
                                            preceding the date of the
                                            Change-in-Control.

         5. OUTPLACEMENT SERVICES. If the Executive's employment with the
Corporation should terminate under circumstances as to entitle the Executive to
receive payment hereunder, the Corporation shall reimburse the Executive for
any reasonable fees or other costs incurred by the Executive during the two (2)
years following the Date of Termination in retaining executive placement
agencies, up to a maximum dollar amount not to exceed fifteen percent (15%) of
the Executive's base salary at the time of such termination. Such reimbursement
shall be made within five (5) days following

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the Executive's presentment of bills or other evidence of the costs incurred
with executive placement agencies.

         6. TAX IMPLICATIONS. If any payment due to the Executive pursuant to
this Agreement result in a tax being imposed on the Executive pursuant to
Section 4999 of the Internal Revenue Code of 1954, as amended, or any successor
provision ("Section 4999"), then the Corporation shall, at the Executive's
option, either (i) reduce the total payments payable to the Executive to the
maximum amount payable without incurring the Section 4999 tax, or (ii) pay to
the Executive the total amount payable, with the understanding that Section
4999 tax will be due on that total amount.

         7. BENEFITS. If the Executive's employment with the Corporation should
terminate under circumstances as to entitle the Executive to receive payment
hereunder, the Executive shall also be deemed, for purposes of medical
insurance, pension and other benefits of the Corporation, to have remained in
the continuous employment of the Corporation for the two (2) year period
following the Date of Termination and shall be entitled to all of the medical
insurance, pension or other benefits provided by the Corporation as if the
Executive had so remained in the employment of the Corporation. If, for any
reason, whether by law or provisions of the Corporation's employee medical
insurance, pension or other benefit plans, or otherwise any benefits which the
Executive would be entitled to under this SECTION 6 cannot be paid pursuant to
such employee benefit plans, then the Corporation contractually agrees to pay
the Executive the difference between the benefits which the Executive would
have received in accordance with this Section if the relevant employee medical
insurance, pension or other benefit plan could have paid such benefit and the
amount of benefits, if any, actually paid by such employee medical insurance,
pension or other benefit plan. The Corporation shall not be required to fund
its obligation to pay the foregoing difference.

         8. OTHER EMPLOYMENT. In the event of termination under the
circumstances contemplated in SECTION 4(B) hereunder, the Executive shall have
no duty to seek any other employment after termination of her employment with
the Corporation and the Corporation hereby waives and agrees not to raise or
use any defense based upon the position that the Executive had a duty to
mitigate or reduce the amounts due her hereunder by seeking other employment
whether suitable or unsuitable and should the Executive obtain other
employment, then the only effect of such on the obligations of the Corporation
shall be that the Corporation shall be entitled to credit against any payments
that would otherwise be made pursuant to SECTION 7 hereof, any comparable
payments to which the Executive is entitled under the employee benefit plans
maintained by the Executive's other employer or employers in connection with
services to such employer or employers after termination of this employment
with the Corporation.

         9. STOCK APPRECIATION RIGHTS AND OPTIONS. If the Executive's
employment should terminate under circumstances as to entitle the Executive to
receive payment hereunder, then with respect to any standing Stock Appreciation
Rights and/or Options which did not immediately become exercisable upon the
occurrence of a Change-in-Control, such Stock Appreciation Right or Option
shall be automatically vested and remain outstanding in accordance with its
terms and be exercisable thereafter until the stated expiration date of such
Stock Appreciation Right or Option.

         10.      MISCELLANEOUS.

         (a)      This Agreement shall be construed under the laws of the
                  Commonwealth of Pennsylvania.

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         (b)      This Agreement constitutes the entire understanding of the
                  parties hereto with respect to the subject matter hereof and
                  may only be amended or modified by written agreement signed
                  by the parties hereto.

         (c)      The Corporation will 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 the
                  Corporation, by agreement in form and substance satisfactory
                  to the Executive, to expressly assume and agree to perform
                  this Agreement in the same manner required of the Corporation
                  and to perform it as if no such succession had taken place.
                  As used in this Agreement, "Corporation" shall mean the
                  Corporation as hereinbefore defined and any successor to its
                  business and/or assets as aforesaid which executes and
                  delivers the agreement provided for in this subsection (c) or
                  which otherwise becomes bound by all of the terms and
                  provisions of this Agreement by operation of law.

         (d)      This Agreement shall inure to the benefit of and be
                  enforceable by the Executive and the Corporation and their
                  respective legal representatives, executors, administrators,
                  successors, heirs, distributees, devisees and legatees. If
                  the Executive should die while any amounts would still be
                  payable to her hereunder if she had continued to live, all
                  such amounts, unless otherwise provided herein, shall be paid
                  in accordance with the terms of this Agreement to her
                  devisee, legatee or other designee or, if there be no such
                  designee, to her estate.

         (e)      Any notice or other communication provided for in this
                  Agreement shall be in writing and, unless otherwise expressly
                  stated herein, shall be deemed to have been duly given if
                  mailed by United States registered mail, return receipt
                  requested, postage prepaid, addressed in the case of the
                  Executive to her office at the Corporation with a copy to her
                  residence and in the case of the Corporation to its principal
                  executive offices, attention to the Chief Executive Officer.

         (f)      No provision of this Agreement may be modified, waived or
                  discharged unless such waiver, modification or discharge is
                  agreed to in writing signed by the Executive and approved by
                  resolution of the Board of Directors of the Corporation. No
                  waiver by either party hereto at any time of any breach by
                  the other party hereto of, or compliance with, any condition
                  or provision of this Agreement to be performed by such other
                  party shall be deemed a waiver of similar or dissimilar
                  provisions or conditions at the same or at any prior or
                  subsequent time. No agreements or representations, oral or
                  otherwise, express or implied, with respect to the subject
                  matter hereof have been made by either party which are not
                  set forth expressly in this Agreement.

         (g)      The invalidity or unenforceability of any provisions of this
                  Agreement shall not affect the validity or unenforceability
                  of any other provision of this Agreement, which shall remain
                  in full force and effect. If any provision hereof shall be
                  deemed invalid or unenforceable, either in whole or in part,
                  this Agreement shall be deemed amended to delete or modify,
                  as necessary, the offending provision and to alter the bounds
                  thereof in order to render it valid and enforceable.

         (h)      This Agreement may be executed in one or more counterparts,
                  each of which shall be deemed to be an original but all of
                  which taken together will constitute one and the same
                  instrument.

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         (i)      If litigation should be brought to enforce, interpret or
                  challenge any provision contained herein, the prevailing
                  party shall be entitled to its reasonable attorney's fees and
                  disbursements and other costs incurred in such litigation
                  and, if a money judgment be rendered in favor of the
                  Executive, to interest on any such money judgment obtained
                  calculated at the prime rate of interest in effect from time
                  to time at Mellon Bank, N.A., from the date that the payment
                  should have been made or damages incurred under this
                  Agreement.

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         IN WITNESS WHEREOF, this Agreement has been executed on the date first
above written.

ATTEST:                                 TOLLGRADE COMMUNICATIONS, INC.


                                        By:
                                            --------------------------------
WITNESS:


                                        ------------------------------------
                                        Sara M. Antol

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SCHEDULE 10.1

Change in Control Agreements were entered into between the Company and Robert
Cornelia, Ruth Dilts, Herman Flaminio, Rocco Flaminio, Mark Frey, Joseph
Giannetti, Douglas Halliday, Fred Kiko, Samuel Knoch, Goeffrey Lea, Gregory
Nulty, Matthew Rosgone and Kristee Williams, which were substantially identical
to that filed as Exhibit 10.1.

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