00281nam a2200109Ia 4500008004100000100001200041245002800053250002100081260004100102300001200143650001600155240817s9999    xx            000 0 und d  aSklar,B 0aDigital Communications.  a621.38153 Sp33,i  c2005a New Delhib Pearson Education  a1103 p.  a Electronic