CHAPT ER
5-1
Cisco ASR 903 Router Hardware Installation Guide
OL-25178-05
5
Troubleshooting
The following sections provide information for troubleshooting problems on the CiscoASR 903 Router.
•Pinouts, page 5-1
•LED Summary, page5-8

Pinouts

The following sections describe the pinouts for the CiscoASR 903 Router interfaces:
•BITS Port Pinout, page 5-1
•GPS Port Pinout, page5-2
•Time of Day Port Pinout, page5-2
•Alarm Port Pinout, page5-3
•Console/Aux RJ45 RS232 Serial Port Pinout, page5-3
•T1/E1 Port Pinout, page5-4
•Serial Cable Pinouts, page5-5
•Management Ethernet Port Pinout, page 5-7
•USB Console Port Pinout, page5-7
•Fiber-Optic Specifications, page 5-8

BITS Port Pinout

Table 5 -1 summarizes the BITS port pinout.
Table5-1 BITS Port Pinout
Pin Signal Name Direction Description
1 RX Ring Input Receive Ring
2 RX Tip Input Receive Tip
3 Not used
4 TX Ring Output TX Ring