Cisco ASR 903 Installation Guide

DescriptionDirectionSignal NamePin
——GND4
——5
1PPS RS422 signal
Input1PPS_P6
Time of Day R422 output or input signalOutput or InputTOD_N7
Time of Day R422 output or input signalOutput or InputTOD_P8
Alarm Port Pinout
The table below summarizes the external alarm input pinout.
Table 30: External Alarm Input Pinout
DescriptionSignal NamePin
Alarm input 0ALARM0_IN1
Alarm input 1ALARM1_IN2
No connect—3
Alarm input 2ALARM2_IN4
Alarm input 3ALARM3_IN5
No connect—6
No connect—7
Alarm
common
COMMON8
Console/Aux RJ45 RS232 Serial Port Pinout
The table below summarizes the console/aux RJ45 RS232 serial port pinout.
Table 31: Console/Aux RJ45 RS232 serial port
DescriptionDirectionSignal
Name
Pin
Request to sendOutputRTS1
Data Terminal Ready (always On).OutputDTR2
Transmit dataOutputTXD3
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
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Troubleshooting
Alarm Port Pinout

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English