00420nam a2200097Ia 4500008004100000050002100041264007100062700002800133245007000161247009100231230508s1996    xx            000 0 und d  aTK 5105 U53 1996  a[Place of publication not identified] : bSams Publishing, c1996.1 aHeld, Gilbert rev.eed.00aUnderstanding data communications 5th ed.cHeld, Gilbert rev. ed.  aUnderstanding data communications 5th ed._TK 5105 U53 1996_Held, Gilbert rev. ed._1996