<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10-K
FOR THE YEAR ENDED 12/31/2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.

<CIK> 0001002531
<NAME> TOLLGRADE COMMUNICATIONS, INC.

                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               DEC-31-2000
<CASH>                                      30,423,783
<SECURITIES>                                28,405,655
<RECEIVABLES>                               18,975,643
<ALLOWANCES>                                   200,000
<INVENTORY>                                 30,499,482
<CURRENT-ASSETS>                           119,639,388
<PP&E>                                      12,695,400
<DEPRECIATION>                               6,191,477
<TOTAL-ASSETS>                             131,274,556
<CURRENT-LIABILITIES>                        8,504,766
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                     2,665,853
<OTHER-SE>                                 120,093,987
<TOTAL-LIABILITY-AND-EQUITY>               131,274,556
<SALES>                                    114,426,097
<TOTAL-REVENUES>                           114,426,097
<CGS>                                       42,637,979
<TOTAL-COSTS>                               42,673,979
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                             43,352,168
<INCOME-TAX>                                15,857,000
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                27,495,168
<EPS-BASIC>                                       2.18
<EPS-DILUTED>                                     2.06