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Cisco 811 and Cisco 813 Routers Hardware Installation Guide
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1
Product Overview
The Cisco 811 and 813 routers connect small professional offices or
telecommuters over Integrated Services Digital Network (ISDN) Basic Rate
Interface (BRI) lines to corporate local area networks (LANs) and the Internet.
The routers offer multiprotocol routing between LAN and WAN ports.
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.
The Cisco 811 and 813 routers include both the ISDN U and ISDN S/T ports.
The ISDN U interface is a two-wire interface from the telephone switch that
supports full-duplex data transfer over a single pair of wires. The Cisco 811 and
813 ISDN U interface supports the data service unit (DSU) feature that is
integrated in the routers.
The ISDN S/T interface is a four-wire interface from the telephone switch that
supports full-duplex data transfer over two pairs of wires. Telephone service
providers typically provide an ISDN S/T interface. The Cisco 811 and 813 ISDN
S/T interface supports the connection to an external DSU, from which you can
connect a digital telephone and other network devices.
The Cisco 813 router supports data and voice applications. The data applications
are implemented through the ISDN port. The voice applications are implemented
with ISDN BRI and through the telephone ports.