00438nam 2268942 450000100060000000300230000600500090002900800410003808200080007907200310008702000170011810000160013526000240015124500300017565000310020565000340023668942StarLibrary Marc Built20180420201711 ||||| |||||||||||amh  a621 aCommunications and Control a0-07001069-2 asayd riffat bMCGRAW. HILL c1997 adigital switching systems aCommunications and Control aSWItching System Fundamentals