Nortel Networks 2750 User Manual
80
Appendix A Technical specifications
NN46110-318 02.01
Figure 28
Serial cable (9-pin D-sub plug to RS-232-C modem plug)
provides the multiple DB9/DB25 serial interface cable pinouts.
Modem cable specifications
If you need to connect a modem to a VPN Router 2750, you must obtain an
appropriate modem cable. The modem cable must have a 9-pin D-sub plug that
connects to the VPN Router 2750 serial port and a 25-pin D-sub plug that
connects to the RS-232-C modem port (
appropriate modem cable. The modem cable must have a 9-pin D-sub plug that
connects to the VPN Router 2750 serial port and a 25-pin D-sub plug that
connects to the RS-232-C modem port (
Table 20
Multiple DB9 and DB25 connector pinouts
Serial port
DB9 connector
Serial port
DB25 connector
Serial port
DB25 connector
Serial port
DB9 connector
Pinout
Signal
Pinout
Signal
Pinout
Signal
Pinout
Signal
2
RXD
3
TXD
>
2
RXD
3
TXD
3
TXD
2
RXD
>
3
TXD
2
RXD
4
DTR
20
DSR
>
6
DTR
6
DSR
5
Ground
7
Ground
>
7
Ground
5
Ground
6
DSR
6
DTR
>
20
DSR
4
DTR
7
RTS
4
RTS
>
5
CTS
8
CTS
8
CTS
5
CTS
>
4
RTS
7
RTS
Pin 1
Pin 5
Pin 6
Pin 9
10 ft
(3.05 m)
9-position D-sub receptacle with screw locks
(ground shield connected to backshell)
CAB0056A
Pin 13
Pin 1
Pin 25
Pin 14
25-position D-sub plug with screw locks
(ground shield connected to backshell)