Modem (9-25) Cable
(To Computer).
(To Modem).

 

 
Female
Male
Dir
Shield
1
---
Transmit Data
3
2
-->
Receive Data
2
3
<--
Request to Send
7
4
-->
Clear to Send
8
5
<--
Data Set Ready
6
6
<--
System Ground
5
7
---
Carrier Detect
1
8
<--
Data Terminal Ready
4
20
-->
Ring Indicator
9
22
<--