00514nam a22001812  4500001001100000005001700011008004100028020001700069040001500086100003100101245006000132250001300192260004300205300001600248650003500264700003000299852000300329000001307620151217152121.0090526s         xx           000 0 eng d  a8177585582 :  aKABUcKABU1 aRoddy, Dennis.@000017019110aElectronic communications /cDennis Roddy, John Coolen.  a4th  ed.  aNew Delhi :bPearson Education,c2008.  axi, 723  p. 0aTelecommunication.@00001563211 aCoolen, John.@00001701921