<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10-Q
FOR THE PERIOD ENDED MARCH 27, 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>                             JAN-01-1999
<PERIOD-END>                               MAR-27-1999
<CASH>                                       8,201,373
<SECURITIES>                                13,227,968
<RECEIVABLES>                                9,755,810
<ALLOWANCES>                                   199,886
<INVENTORY>                                 14,435,323
<CURRENT-ASSETS>                            46,486,979
<PP&E>                                       7,534,844
<DEPRECIATION>                               4,096,038
<TOTAL-ASSETS>                              50,913,793
<CURRENT-LIABILITIES>                        4,452,416
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                     1,186,913
<OTHER-SE>                                  45,264,514
<TOTAL-LIABILITY-AND-EQUITY>                50,913,793
<SALES>                                     11,120,345
<TOTAL-REVENUES>                            11,120,345
<CGS>                                        4,751,944
<TOTAL-COSTS>                                4,751,944
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                               100,000
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                              2,317,060
<INCOME-TAX>                                   831,000
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 1,486,060
<EPS-PRIMARY>                                      .26
<EPS-DILUTED>                                      .25