00471nam 2276527 450000100060000000300230000600500090002900800410003808200120007907200240009102000180011510000060013326000200013924500380015965000240019765000470022165000230026876527StarLibrary Marc Built20180420201711 ||||| |||||||||||amh  a621.382 adata communications a81-219-3702-7 ad bS. CHAND c2011 adata comunications and networking adata communications ainterfaces transmission media multiplexing anetwork mechanisms