<ARTICLE> 5
<MULTIPLIER> 1,000
       
                                                                       
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                          36,679                  45,858                  49,008
<SECURITIES>                                     4,500                   5,899                   3,900
<RECEIVABLES>                                   59,453                  58,899                  69,421
<ALLOWANCES>                                     3,591                   3,683                   3,067
<INVENTORY>                                     28,724                  24,388                  21,805
<CURRENT-ASSETS>                               134,725                 136,721                 147,301
<PP&E>                                          14,553                  31,833                  34,039
<DEPRECIATION>                                  15,769                  17,062                  19,254
<TOTAL-ASSETS>                                 150,473                 154,050                 164,581
<CURRENT-LIABILITIES>                           35,553                  33,685                  40,473
<BONDS>                                            792                     844                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                        48,854                  49,404                  49,768
<OTHER-SE>                                      64,801                  69,699                  73,859
<TOTAL-LIABILITY-AND-EQUITY>                   150,473                 154,050                 164,581
<SALES>                                         64,764                 139,358                 218,917
<TOTAL-REVENUES>                                64,764                 139,358                 218,917
<CGS>                                           45,997                 100,988                 160,344
<TOTAL-COSTS>                                   45,977                 100,988                 160,344
<OTHER-EXPENSES>                                12,728                  26,278                  40,926
<LOSS-PROVISION>                                     7                      20                   (178)
<INTEREST-EXPENSE>                                  17                      31                      70
<INCOME-PRETAX>                                  6,573                  13,070                  19,038
<INCOME-TAX>                                     2,169                   3,798                   5,603
<INCOME-CONTINUING>                              4,400                   9,249                  13,435
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     4,400                   9,249                  13,435
<EPS-PRIMARY>                                     0.21                    0.43                    0.63
<EPS-DILUTED>                                     0.20                    0.42                    0.61