5-6
Cisco ASR 903 Router Hardware Installation Guide
OL-25178-05
Chapter5 Troubleshooting
Pinouts
DB-9 Connector Pinouts
Table 5 -7 summarizes the pinouts for each serial interface type when using a DB-9 connector.
Note Twisted pairs are 2-5, 6-8, 4-7.
Note The X.21, V.35, RS-485, EIA-449, EIA-530, and IRIG-B standards are not currently supported by
software.
RJ-45 Connector Pinouts
Table 5 -8 summarizes the pinouts for each serial interface type when using an RJ-45 connector.
Note Twisted Pairs are: 1-2, 3-6, 4-5, 7-8.
Table5-7 DB-9 Pin-outs
Pin Standard DB-9 Direction Description RS-485 IRIG-B
1 NC Output Unused NC NC
2 RxD Input Receive NC NC
3 TxD Output Transmit IRIG-B (RS232) IRIG-B (RS232)
4 DTR Output DTR TxD- IRIG-B- (RS485)
5 GND GND GND GND
6 DSR Input DSR RxD NC
7 RTS Output RTS TxD+ IRIG-B+
8 CTS Input CTS RxD+ ( NC
9 NC/GND Unused or Ring NC NC
Table5-8 RJ45 Pinout
Pin Standard DB-9 Direction Description RS-485 IRIG-B
1 RTS Input Ready to send RxD+ (RS485) NC
2 DTR Input DTR RxD- (RS485) NC
3 TxD Input Transmit NC NC
4 GND Signal ground Gnd Gnd
5 GND Signal ground Gnd Gnd
6 RxD Output Receive data IRIG-B (RS232) IRIG-B (RS232)
7 DST Output DSR TxD- IRIG-B- (RS485)
8 CTS Output CTS TxD+ IRIG-B+ (RS485)