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Modem (25-25) Cable

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

25 PIN D-SUB FEMALE (To Computer).
25 PIN D-SUB MALE (To Modem).

25 PIN D-SUB FEMALE to the Computer
25 PIN D-SUB MALE to the Modem

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


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