Chapter 3 Installing the Cisco 12404 Internet Router
Connecting to the Console Port and Auxiliary Ports
3-15
Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
GRP Console Port Signals
The console port on the GRP requires a straight-through EIA/TIA-232 cable.
describes the console port pin signals for the GRP.
GRP Auxiliary Port Signals
The auxiliary port on the GRP is a DB-25 plug DTE port for connecting a modem
or other DCE device (such as a CSU/DSU or other router) to the Cisco 12404
router.
There are several models of the GRP that can be used with the Cisco 12404 router:
the GRP=, the GRP-B=, and the GRP-C=. In order to maintain Class B EMI
compliance, shielded cables must be used on the console and auxiliary ports of
the GRP= and GRP-B=. The newer GRP-C= does not require shielded cables for
Class B compliance.
Table 3-1
GRP Console Port Pin Signals
Pin
Signal
Input/Output
Description
1
GND
–
Ground
2
TxD
Output
Transmit Data
3
RxD
Input
Receive Data
6
DSR
Input
Data Set Ready (always on)
7
GND
–
Ground
8
DCD
Input
Data Carrier Detect (always on)
20
DTR
Output
Data Terminal Ready
todd.book Page 15 Tuesday, November 27, 2007 6:02 PM
