* 25-pin DTE devices transmit on pin 2 and receive on pin 3.
* 25-pin DCE devices transmit on pin 3 and receive on pin 2.
* 9-pin DTE devices transmit on pin 3 and receive on pin 2.
* 9-pin DCE devices transmit on pin 2 and receive on pin 3.

Networking

A general rule is that DCE devices provide the clock signal (internal clocking) and the DTE device synchronizes on the provided clock (external clocking).

This term is also generally used in the Telco

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