Bay Networks BayStack ARN Routers none Installation And Operating Manual page 135

The connector pin assignment described in
assignments for the modem port.
Table C-13.
Pin Assignment
114200 Rev. A
Service Modem Port DB-9 Pin Assignments
Pin 1
Pin 9
Table C-13
Pin No. Signal Name
1 DCD (Data carrier detect)
2 TXD (Transmit data)
3 RXD (Receive data)
4 DSR (Data set ready)
5 GND
6 DTR (Data terminal ready)
7 CTS (Clear to send)
8 RTS (Request to send)
9 Not used
Technical Specifications
shows signal and pin
Direction
From modem
To modem
From modem
From modem
N/A
To modem
From modem
To modem
N/A
C-15