Cisco CISCO776 Installation Guide - Page 77
ISDN Ports
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PSTN Public Switched Telephone Network RIP Routing Information Protocol Service Profile Identifiers (SPIDs) Numbers assigned by the ISDN service provider that identify the ISDN B channels. They are assigned only in North America. The SPID format is generally the ISDN telephone number with several numbers added to it. Depending on the switch type supporting your ISDN BRI line, your ISDN line might be assigned none, one, or two SPIDs. TCP Transmission Control Protocol TPAD Terminal Packet Assembler and Disassembler ISDN Ports Cisco 700 series routers provide one basic rate interface (BRI). The ISDN BRI service provided by your telephone service provider offers two bearer channels (B channels) and one data channel (D channel). The B channel operates at 64 kbps and carries user data. The D channel operates at 16 kbps and carries control and signaling information, although it can support user data transmission under certain circumstances. Outside North America, telephone service providers typically provide an S/T interface. The S/T interfaces are four-wire (two pairs of two wires) interfaces that supports full-duplex data transfer over two pairs of wires. Inside North America, telephone service providers typically provide a U interface. The U interface is a two-wire (single pair) interface that supports full-duplex data transfer over a single pair of wires. Concepts and Descriptions 6-3