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Modem (9-25) cable

pinout

This cable should be used for DTE to DCE (for instance computer to modem) connections with hardware handshaking.

9 pin D-SUB female
9 pin D-SUB female connector  to the Computer
  Female Male Dir
Shield 1---
Transmit Data32-->
Receive Data23<--
Request to Send74-->
Clear to Send85<--
Data Set Ready66<--
System Ground57---
Carrier Detect18<--
Data Terminal Ready420-->
Ring Indicator922<--

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

Source:www.pinouts.ru

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