Specifications

2-18 Cisco Multiport Router Hardware Installation and Configuration Guide
Preparing to Connect to a Network
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 hardware flow control. For detailed information about installing a console
terminal, see the section “Connecting to the Console Port” in the chapter “Installing the
Router.” See the appendix “Cable Specifications” for cable and port pinouts.
Auxiliary Port Connections
Your router includes an EIA/TIA-232 asynchronous serial auxiliary port (RJ-45) that
supports hardware flow control. A cable and an adapter to connect a modem to the auxiliary
port are included. To connect a modem to the auxiliary port, use the RJ-45-to-RJ-45
roll-over cable (looks like a telephone cable) with the male RJ-45-to-DB-25 adapter
(labeled “MODEM”). For detailed information about connecting devices to the auxiliary
port, see the section “Connecting a Modem to the Auxiliary Port” in the chapter “Installing
the Router.” See the appendix “Cable Specifications” for cable and port pinouts.