# Modem (9-25)

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

(To Computer).
(To Modem).

9 PIN D-SUB FEMALE to the Computer
25 PIN D-SUB MALE to the 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 |

Contributor: Joakim Ögren, Søren Graversen

Source:
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Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-08