5-3
Cisco ASR 903 Router Hardware Installation Guide
OL-25178-05
Chapter5 Troubleshooting
Pinouts
Alarm Port Pinout
Table 5 -4 summarizes the external alarm input pinout.
Console/Aux RJ45 RS232 Serial Port Pinout
Table 5 -5 summarizes the console/aux RJ45 RS232 serial port pinout.
7 TOD_P Output or Input Time of Day
character
8 TOD_N Output or Input Time of Day
character
Table5-3 RJ45 1PPS/ToD Port Pinout (continued)
Pin Signal Name Direction Description
Table5-4 External Alarm Input Pinout
Pin Signal Name Description
1 ALARM0_IN Alarm input 0
2 ALARM1_IN Alarm input 1
3 No connect
4 ALARM2_IN Alarm input 2
5 ALARM3_IN Alarm input 3
6 No connect
7 No connect
8 COMMON Alarm common
Table5-5 Console/Aux RJ45 RS232 serial port
Pin Signal Name Direction Description
1 RTS Output Request to send
2 DTR Output Data Terminal Ready (always On).
3 TXD Output Transmit data
4 RI Ring Indicator
5GND
6 RXD Input Receive data
7 DSR/DCD Input Data set ready/Data Carrier detect
8 CTS Input Clear to send