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Sorting out the hip from the hype in new CD-ROMs, Web sites, and books. Do You Get This Bit? The Cisco Systems Internetworking Terms and Acronyms Web page has definitions for everything from A&B bit signaling ("Procedure used in T1 transmission facilities in which each of the 24 T1 subchannels devotes one bit of every sixth frame to the carrying of supervisory signaling information. Also called 24th channel signaling."), to zone multicast address ("Data-link-