<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10-Q
FOR THE PERIOD ENDED SEPTEMBER 25, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0001002531
<NAME> TOLLGRADE COMMUNICATIONS, INC.

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JUN-27-1999
<PERIOD-END>                               SEP-25-1999
<CASH>                                       8,305,683
<SECURITIES>                                15,748,506
<RECEIVABLES>                                9,608,283
<ALLOWANCES>                                   198,801
<INVENTORY>                                 17,942,072
<CURRENT-ASSETS>                            49,640,788
<PP&E>                                       8,068,136
<DEPRECIATION>                               4,411,861
<TOTAL-ASSETS>                              56,548,301
<CURRENT-LIABILITIES>                        4,757,400
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                     1,194,097
<OTHER-SE>                                  49,601,411
<TOTAL-LIABILITY-AND-EQUITY>                56,548,301
<SALES>                                     13,402,653
<TOTAL-REVENUES>                            13,402,653
<CGS>                                        6,039,595
<TOTAL-COSTS>                                6,039,595
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                              3,030,333
<INCOME-TAX>                                 1,092,000
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 1,938,333
<EPS-BASIC>                                       0.34
<EPS-DILUTED>                                     0.32