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.

Table 2-2 Pinouts for the RJ-45-to-DB-25 Adapters

Adapter

DTE M/F Pins1

DCE M/F Pins

MMOD Pins2

1

4

5

5

 

 

 

 

2

20

6

8

 

 

 

 

3

2

3

3

 

 

 

 

4

7

7

7

 

 

 

 

5

7

7

7

 

 

 

 

6

3

2

2

 

 

 

 

7

6

20

20

 

 

 

 

8

5

4

4

 

 

 

 

1.The female data terminal equipment (FDTE) adapter that is available from Cisco is labeled “Terminal”.

2.The MMOD adapter that is available from Cisco is labeled “Modem”.

Refer to Table 2-2for 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.)

 

Cisco 7401ASR Installation and Configuration Guide

2-14

OL-5419-01 B0

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Image 48
Cisco Systems 7401ASR manual Connecting I/O Cables, Connecting Console and Auxiliary Port Cables