Two-Wire modem (9-25) cable
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Two-Wire modem (9-25) cable

pinout

This cable should be used for DTE to DCE (for instance computer to modem) connections without hardware handshaking.

9 pin D-SUB female
9 pin D-SUB female connector  to the Computer
Female Male Dir
Shield Ground 1 
Transmit Data32-->
Receive Data23<--
System Ground57 
    
Jumper these:   
Request to Send7 -->
Clear to Send8 <--
    
Data Set Ready6 <--
Carrier Detect1 <--
Data Terminal Ready4 -->
    
Request to Send 4-->
Clear to Send 5<--
    
Data Set Ready 6<--
Carrier Detect 8<--
Data Terminal Ready 20-->

25 pin D-SUB male
25 pin D-SUB male connector  to the Modem

Source:www.pinouts.ru


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