00342nam a2200121Ia 4500008004100000040001700041041001200058082001800070100002900088245005400117260003400171300001500205230917s9999||||xx |||||||||||||| ||und||  e192440aMAIN  aEnglish  a621.382 V829T  aViswanathan, Thiagarajan 0aTelecommunication switiching systems and networks  aNew DelhibPHI Learningc2011  axx, 583 p.