81
Route Switch Processor (RSP8) Installation and Configuration Guide
OL-4920-02
Reference Information
Auxiliary Port Signals
The auxiliary port on the RSP8 is an EIA/TIA-232, DTE, DB-25 plug to which you can attach a CSU or
DSU or other equipment in order to access the router from the network. The asynchronous auxiliary port
supports hardware flow control and modem control.
Table 6
lists the signals used on this port.
Console and Auxiliary Y-Cable Pinouts
The console and auxiliary Y-cables allow you to simultaneously connect the console ports or auxiliary
ports on two RSPs (configured as system active and slave in RSP slots 2 and 3 in the Cisco 7507 and
Cisco 7507-MX, and RSP slots 6 and 7 in the Cisco 7513 and Cisco 7513-MX) to one console terminal
or external auxiliary device (such as a modem).
The two Y-cables (Product Number CAB-RSP8CON=, shown in
Figure 6
, and Product Number
CAB-RSP8AUX=, shown in
Figure 7
) ship with the router and are available as spare parts. The console
Y-cable pinout is listed in
Table 7
, and the auxiliary Y-cable pinout is listed in
Table 8
.
3
RxD
—>
Receive Data
6
DSR
—>
Data Set Ready (always on)
7
GND
–
Ground
8
DCD
—>
Data Carrier Detect (always on)
Table 5
Console Port Signals (Continued)
Pin
Signal
Direction
Description
Table 6
Auxiliary Port Signals
Pin
Signal
Direction
Description
2
TxD
—>
Transmit Data
3
RxD
<—
Receive Data
4
RTS
—>
Request To Send (used for hardware flow control)
5
CTS
<—
Clear To Send (used for hardware flow control)
6
DSR
<—
Data Set Ready
7
Signal Ground
–
Signal Ground
8
CD
<—
Carrier Detect (used for modem control)
20
DTR
—>
Data Terminal Ready (used for modem control only)
Table 7
Console Y-Cable Signals (Product Number CAB-RSP8CON=)
Female DB-25 Pins
Male DB-25 Pins
Signal Description
P1-1
J1-1 and J2-1
Ground
P1-2
J1-2 and J2-2
Receive Data (RxD)
P1-3
J1-3 and J2-3
Transmit Data (TxD)
P1-4
J1-4 and J2-4
Clear To Send (CTS); looped to 5
P1-5
J1-5 and J2-5
Request To Send (RTS); looped to 4