
Description
Direction
Signal Name
Pin
—
—
GND
4
—
—
5
1PPS RS422 signal
Input
1PPS_P
6
Time of Day R422 output or input signal
Output or Input
TOD_N
7
Time of Day R422 output or input signal
Output or Input
TOD_P
8
Alarm Port Pinout
The table below summarizes the external alarm input pinout.
Table 30: External Alarm Input Pinout
Description
Signal Name
Pin
Alarm input 0
ALARM0_IN
1
Alarm input 1
ALARM1_IN
2
No connect
—
3
Alarm input 2
ALARM2_IN
4
Alarm input 3
ALARM3_IN
5
No connect
—
6
No connect
—
7
Alarm
common
COMMON
8
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
Description
Direction
Signal
Name
Pin
Request to send
Output
RTS
1
Data Terminal Ready (always On).
Output
DTR
2
Transmit data
Output
TXD
3
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
164
Troubleshooting
Alarm Port Pinout