00619nam a22001457a 4500003000200000005001700002082001500019100002100034245006600055260003800121300000800159520023300167650003200400650004100432020260731153717.0  a384 09 SRE  aSreekanth, P. V.  aTelecom networks of digital era : a chronicle of developments  bIEEE Communications Societyc2025  a948  aThe book offers a comprehensive chronological analysis of how telecommunication systems evolved from fragile analog configurations into the highly resilient, intelligent digital infrastructures that power today's global economy.  aTelecommunication - History  aDigital communications - Development