00521nam a2200157Ia 45000010003000000050017000030080041000200200015000610820014000761000022000902450053001122500013001652600060001783000046002386500079002849520261006003422.0120911s9999    xx            000 0 und d  a0805377204  a004.6 STA  aStamper, David A.  aBusiness data communications / David A. Stamper.  a3rd. ed.  aRedwood City, Calif. : Benjamin/Cummings Pub.Co., c1991  axxxix, 620 p. : ill. (some col.) ; 25 cm.  aData transmission systems.   2. Business enterprises -- Computer networks.