00520nam a22001217a 4500020002400000082001700024100001600041245006800057260005500125300003500180500004100215650014200256  a9788122430882 (pbk)  a621.382bDAS  aDas, Apurba  aLine communication systembtelecommunication switching approach  aNew DelhibNew Age International (p) Limitedc2010  axvii, 266 p.b: ill.c; 24 cm.  aIncludes Bibliographical references.  aTelecommunication linesvSwitching systemsvComputer CommunicationvCircuit SwitchingvTelephone systemvTelephone NetworkvNetworkvFEAS