00000nam a2200000 a 4500 20251203091636.0 047183727X 658.05, D, fit FitzGerald, Jerry Business data communications: basic concepts, security and design 2nd ed. New York John Willey & Sons 1988 xix, 655p, 24cm Data transmission system Eng 100 010 _ 54065 W 47457 47457 2 0 0 0 PU PU 1998-04-08 9.50 0 658.05, D, fit 54065 BK