00719nam a2200217Ia 4500 20230706110527.0 210716s2003 xx 000 0 und d 8129702118 AIMIT LIBRARY eng 004.65 7 HELG Held, Gilbert. 125733 Understanding data communications / By Gilbert Held. 7th ed. New Delhi : Pearson Education , 2003. xv,765p. ; PB 24 cm. Messages and transmission channels 125734 Asynchronous modems and interfaces 125735 Synchronous modems digital transmission and service units 125736 ddc BK 7th 004.65 HELG 186260 186260 0 0 ddc 0 0 MCA AIMIT AIMIT Intel Book Distributors 295.00 Bill no:8894; Bill dt:2004-04-04 0 004.65 HELG MCA05768 2025-07-21 00:00:00 236.00 2021-07-16 BK 0 0 ddc 0 0 MCA AIMIT AIMIT Higginbothams Pvt Ltd 295.00 Bill no:7025; Bill dt:2006-08-05 0 004.65 HELG MCA07118 2025-07-21 00:00:00 236.00 2021-07-16 BK