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Route Switch Processor (RSP8) Installation and Configuration Guide
OL-4920-02
Reference Information
Auxiliary Port Signals
Theauxiliary port on the RSP8 is an EIA/TIA-232, DTE, DB-25 plug to which you can attach a CSU or
DSUor 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, andRSP 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 inFigure 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 inTable 7, and the auxiliary Y-cable pinout is listed inTable 8.
3 RxD —> Receive Data
6 DSR —> Data Set Ready (always on)
7 GND – Ground
8 DCD —> Data Carrier Detect (always on)
Table5 Console Port Signals (Continued)
Pin Signal Direction Description
Table6 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)
Table7 Console Y-Cable Signals (Product Number CAB-RSP8CON=)
Female DB-25Pins 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