00548nam a2200181   4500001001400000003000700014005001700021008004100038020001500079040000800094100002600102245009100128260004000219300003600259500001900295650003000314650002200344vtls000012093KUKTEM20251117142352.0060606t2004    xxu    gr    |0 1 0|eng |  a0471930512  aUMP1 aHeld, Gilbert,d1943-00aUnderstanding data communications :b from fundamentals to networking /c Gilbert Held  aNew York:b J. Wiley & Sons,c 1991  axviii, 546 p.:b ill.;c 25 cm.  aIncludes index00aData transmission systems00aComputer networks