Cisco Systems Cisco 12816 Manuale Utente
2-27
Cisco 12016, Cisco 12416, and Cisco 12816 Router Installation and Configuration Guide
OL-11495-01
Chapter 2 Preparing for Installation
GRP Port Connection Guidelines
Caution
To maintain Class B EMI compliance, you must use shielded cables when
connecting to the auxiliary and console ports of original GRPs (part numbers
GRP= and GRP-B=). An updated version of the GRP-B= board (Rev. F0) does not
require shielded cables for Class B compliance.
connecting to the auxiliary and console ports of original GRPs (part numbers
GRP= and GRP-B=). An updated version of the GRP-B= board (Rev. F0) does not
require shielded cables for Class B compliance.
GRP Auxiliary Port Signals
The GRP auxiliary port is a DB-25 DTE port for connecting a modem or other
DCE device to the router. The auxiliary port supports hardware flow control and
modem control.
DCE device to the router. The auxiliary port supports hardware flow control and
modem control.
lists the signals used on the auxiliary port.
Table 2-2
GRP Auxiliary Port Signals
Pin
Signal
Direction
Description
1
GND
—
Shield ground
2
TxD
Output
Transmit data (to DCE)
3
RxD
Input
Receive data (from DCE)
4
RTS
Output
Request to send
(used for hardware flow control)
5
CTS
Input
Clear to send (used for hardware flow control)
6
DSR
Input
Data set ready
7
GND
—
Signal ground
8
DCD
Input
Carrier detect (used for modem control)
20
DTR
Output
Data terminal ready (used for modem control
only)
only)
22
RING
Input
Ring