Installation guide

Appendix B: Technical Specifications
E4G Series Routers Hardware Installation Guide
130
Figure 73 shows the pinouts for a 9-pin to 9-pin (PC-AT) null-modem serial cable.
Figure 73: PC-AT Serial Null-modem Cable Pinouts
Table 26 shows port mapping between the MRJ21 connector on the E4G-B16T1E1 module and the E1/T1
ports.
Table 26: Port Mapping between the E4G-B16T1E1 MRJ21 Connectors and T1E1 Ports
MRJ21 Connector 1 MRJ21 Connector 2
Port 1 Port 9
Port 2 Port 10
Port 3 Port 11
Port 4 Port 12
Port 5 Port 13
Port 6 Port 14
Port 7 Port 15
Port 8 Port 16
Screen
DTR
TxD
RxD
CTS
Ground
DSR
RTS
DCD
Cable connector: 9-pin female
Switch
Cable connector: 9-pin female
PC-AT Serial Port
Screen
DCD
RxD
TxD
DTR
Ground
DSR
RTS
CTS
Shell
4
3
2
8
5
6
7
1
Shell
1
2
3
4
5
6
7
8
9pin