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Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
Chapter 2 Rack-Mounting, Tabletop Installation, and Cabling
Connecting I/O Cables
Connecting I/O Cables
This section contains connection equipment information for the Fast Ethernet/Ethernet, Gigabit
Ethernet, console, and auxiliary ports.
Connecting Console and Auxiliary Port Cables
The Cisco 7401ASR router has a DCE-mode console port for connecting a console terminal, and a
DTE-mode auxiliary port for connecting a modem or other DCE device (such as a CSU/DSU or other
router) to your router.
Note Both the console and the auxiliary ports are asynchronous serial ports; any devices connected to these
ports must be capable of asynchronous transmission. (Asynchronous is the most common type of serial
device; for example, most modems are asynchronous devices.)
The Cisco 7401ASR router uses RJ-45 ports for both the auxiliary and console ports.
Before connecting a terminal to the console port, configure the terminal to match the router console port
as follows: 9600 baud, 8 data bits, no parity, 2 stop bits (9600 8N2). After you establish normal router
operation, you can disconnect the terminal.
Refer to Table 2-2 for a list of the pins used on the RJ-45-to-DB-25 adapters, used with an RJ-45 cable,
to connect terminals and modems to the Cisco7200 series routers. The cable you use may be a roll-over
cable or a straight cable.
A roll-over cable can be detected by comparing the two modular ends of the cable. Holding the cables
in your hand, side-by-side, with the tab at the back, the wire connected to the pin on the outside of the
left plug should be the same color as the pin on the outside of the right plug. If your cable was purchased
from Cisco, pin 1 will be white on one connector, and pin 8 will be white on the other (a roll-over cable
reverses pins 1 and 8, 2 and 7, 3 and 6, and 4 and 5). (See Figure 2-10.)
Table 2-2 Pinouts for the RJ-45-to-DB-25 Adapters
Adapter DTE M/F Pins
1
1. The female data terminal equipment (FDTE) adapter that is available from Cisco is labeled “Terminal”.
DCE M/F Pins MMOD Pins
2
2. The MMOD adapter that is available from Cisco is labeled “Modem”.
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