000 00343pam a2200157a 44500
008 230515b2002 xxu||||| |||| 00| 0 eng d
020 _aNULL
041 _aENGLISH
082 _a0
100 _aSYED R ALI
245 _aDIGITAL SWITCHING SYSTEMS
250 _a0
260 _a
_bTATA MC GRAW HILL
_c2002
300 _a217
650 _aNULL
999 _c593994
_d593994