Specifications

Preparing to Install the Router 2-17
Preparing to Connect to a Network
BRI Connections
On models with a Basic Rate Interface (BRI) port, the BRI port is an RJ-45 8-pin connector
located between the UTP and console ports on the Cisco 2520 and Cisco 2521, or between
the 10BT and console ports on the Cisco 2522 and Cisco 2523. Use an appropriate cable to
connect the system directly to the Integrated Services Digital Network (ISDN) through the
NT1. The common carrier will provide the NT1 connection worldwide, except in North
America, where the NT1 is customer owned.
Warning Network hazardous voltages are accessible in the BRI cable. If you detach the
BRI cable, detach the end away from the multiport serial router first to avoid possible
electric shock. Network hazardous voltages also are accessible on the system card in the
area of the BRI port (RJ-45 connector), regardless of whether power is turned off. (To see
translated versions of this warning, refer to the “Regulatory Compliance and Safety
Information” publication.)
Warning The ISDN connection is regarded as a source of voltage that should be
inaccessible to user contact. Do not attempt to tamper with or open any public telephone
operator (PTO)-provided equipment or connection hardware. Any hardwired connection
(other than by nonremovable, connect-one-time-only lug) must be made only by PTO staff
or suitably trained engineers. (To see translated versions of this warning, refer to the
“Regulatory Compliance and Safety Information” publication.)
Console and Auxiliary Port Connections
Your router includes an asynchronous serial console and an auxiliary port. The console and
auxiliary ports provide access to the router either locally (with a console terminal) or
remotely (with a modem). This section discusses important cabling information to consider
before connecting a console terminal (an ASCII terminal or PC running terminal emulation
software) to the console port or modem to the auxiliary port.