Bri Connections; Console And Auxiliary Port Connections; Console Port Connections - Cisco 2500 Series Installation And Configuration Manual
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Preparing to Install the Router
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.
The main difference between the console and auxiliary ports is that the auxiliary port supports hardware
flow control and the console port does not. Flow control paces the transmission of data between a
sending device and a receiving device. Flow control ensures that the receiving device can absorb the data
sent to it before the sending device sends more. When the buffers on the receiving device are full, a
message is sent to the sending device to suspend transmission until the data in the buffers has been
processed. Because the auxiliary port supports flow control, it is ideal for use with the high-speed
transmissions of a modem. Console terminals transmit at slower speeds than modems; therefore, the
console port is ideal for use with console terminals.
Console Port Connections
Your router includes an EIA/TIA-232 asynchronous serial console port (RJ-45). Cables and adapters to
connect a console terminal (an ASCII terminal or PC running terminal emulation software) to the console
port are included. To connect an ASCII terminal to the console port, use the RJ-45-to-RJ-45 roll-over
cable (looks like a telephone cable) with the female RJ-45-to-DB-25 adapter (labeled "TERMINAL"). To
connect a PC running terminal emulation software to the console port, use the RJ-45-to-RJ-45 roll-over
cable with the female RJ-45-to-DB-9 adapter (labeled "TERMINAL"). The default parameters for the
console port are 9600 baud, 8 data bits, no parity, and 2 stop bits. The console port does not support
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