00368pam a2200121 a 4500020002400000041000500024082001200029100004300041245010500084250001100189260003800200300000800238  a978-81-203-5083-0c  h  a621.382  aVishwanathan T., & Bhatnagar MeAuthor  aTelecommunication Switching Syatems and NetworkscVishwanathan T., & Bhatnagar MhTextual Documents   a1st ED  bPHI Learning PVT. Ltd. Pub.c2015  a620