00403nam 2228622 450000100060000000300230000600500090002900800410003808200080007907200110008702000180009810000100011626000200012624500440014665000110019065000340020128622StarLibrary Marc Built20180420201711 ||||| |||||||||||amh  a621 aSignal a81-219-0053-0 aSingh bS. CHAND c2004 aprinciples of communication engineering aSignal aSwitched Communication System