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25 pin D-SUB female connector layout
25 pin D-SUB female connector
at the Computer
This cable should be used for DTE to DCE (for instance computer to modem) connections without hardware handshaking.
  Female Male Dir
Shield Ground 1 1  
Transmit Data 2 2 -->
Receive Data 3 3 <--
System Ground 7 7  
       
Jumper these:      
Request to Send 4   -->
Clear to Send 5   <--
       
Data Set Ready 6   <--
Carrier Detect 8   <--
Data Terminal Ready 20   -->
       
Request to Send   4 -->
Clear to Send   5 <--
       
Data Set Ready   6 <--
Carrier Detect   8 <--
Data Terminal Ready   20 -->
25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the Modem
According to 4 reports in our database (3 positive and 1 negative) this pinout should be correct.

Is this pinout
Two-Wire modem (25-25) cable visual pinout:click to enlarge
Source(s) of this and additional information: Hardware Book
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