000 00580nam a2200205Ia 4500
008 161214s9999 xx 000 0 und d
020 _a8176353191
_c(pbk)
082 _223
_a621.3981
_bHEL
100 _aHeld, Gilbert
245 0 _aUnderstanding Data Communications
250 _a6th ed.
260 _aNew Delhi:
_bTechmedia,
_c1999
300 _a619 p.;
_bIllus. Index.:
_c24 cm.
650 _aData Communications
650 _aDigital Transmission
650 _aFiber-Optics
650 _aMessages and Transmission Channels
650 _aTerminal Devices
942 _2ddc
_cBK
999 _c8500
_d8500