00501nam 2200989 4500001000400000003002300004005000900027008004100036082001000077072002500087020001800112100001500130260001500145250000600160245004100166650002500207650004900232650002800281989StarLibrary Marc Built20180430201711 ||||| |||||||||||amh  a004.6 acommunications media a81-85336-33-4 aJohn Freer bEWP c1988 a2 aComputer Communicetions and Networks acommunications media adata communication concepts and alternatives amodems and multiplexers