00527nam 2278539 450000100060000000300230000600500090002900800410003808200120007907200250009102000180011610000190013426000270015324500730018065000250025365000290027865000400030778539StarLibrary Marc Built20180430201711 ||||| |||||||||||amh  a650.028 acommunications media a0-87709-507-8 aGary B. Shelly bboyd and fraser c1995 abusiness data communications bintroductory concepts and techniques acommunications media acommunications terminals afundamentals of eata communications