Modem Cable Specifications; Figure 28 Modem Cable (9-Pin D-Sub Plug To Rs-232-C Modem Plug); Table 19 Multiple Db9 And Db25 Connector Pinouts - Nortel 1750 Install Manual

78 Appendix A Technical specifications

Figure 28 Modem cable (9-pin D-sub plug to RS-232-C modem plug)

Pin 5
Pin 9
9-position D-sub receptacle with screw locks
(ground shield connected to backshell)
Table 19

Table 19 Multiple DB9 and DB25 connector pinouts

Serial port
DB9 connector
Pinout Signal
2 RXD
3 TXD
4 DTR
5 Ground
6 DSR
7 RTS
8 CTS

Modem cable specifications

If you need to connect a modem to a VPN Router 1750, you must obtain an
appropriate modem cable. The modem cable must have a 9-pin D-sub plug that
connects to the VPN Router 1750 serial port and a 25-pin D-sub plug that
connects to the RS-232-C modem port
NN46110-316 02.01
(3.05 m)
Pin 1
Pin 6
provides the multiple DB9/DB25 serial interface cable pinouts.
Serial port
DB25 connector
Pinout Signal
3 TXD
2 RXD
20 DSR
7 Ground
6 DTR
4 RTS
5 CTS
10 ft
Pin 1
Pin 14
25-position D-sub plug with screw locks
(ground shield connected to backshell)
Serial port
DB25 connector
Pinout
> 2
> 3
> 6
> 7
> 20
> 5
> 4
(Figure 29).
Serial port
DB9 connector
Signal Pinout
RXD 3
TXD 2
DTR 6
Ground 5
DSR 4
CTS 8
RTS 7
Pin 13
Pin 25
CAB0056A
Signal
TXD
RXD
DSR
Ground
DTR
CTS
RTS