AT&T OneVision DEFINITY G3 Guide Installation And Connection Manual page 106

Planning Connectivity
Cables and Connectors
Step
1
2
3
4
5-28 Issue 2 April 1996
Action
Is the connector on the first serial port of the PC a
9-pin connector?
If yes, go to step 3.
If no, go to step 2.
Hint: PC ports are labeled with the port number and
type (serial or parallel).
Is the connector on the first serial port of the PC a
25-pin connector?
If yes, connect the female end of the RS232 cable
to the male connector of the PC's serial port.
If no, go to step 3.
On the modem or data module, connect the male end
of the RS232 cable to the female 25-pin RS232
connector.
On an ADU, connect the cable-end you configured to
the ADU.
Go to To Validate Dial Strings.