DTE vs DCE

From source; http://www.infocellar.com/cable-dsl/dte-vs-dce.htm

DCE (Data Communications Equipment) and DTE (Data Terminal Equipment) are descriptions of the role an Ethernet interface plays in 2-way communication.

DCE is typically the upstream device (network end), and DTE the downstream device (user end).  DTE is an end station, while DCE is a server, router, or hub.  But this can vary

AND-FROM URL: http://en.wikipedia.org/wiki/Data_terminal_equipment

Usually, the DTE device is the terminal (or a computer emulating a terminal), and the DCE is a modem.

DTE is usually a male connector and DCE is a female connector.

A general rule is that DCE devices provide the clock signal (internal clocking) and the DTE device synchronizes on the provided clock (external clocking). D-sub connectors follow another rule for pin assignment.

* 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

UPDATE; – Sat 17 April 2010 ->>> http://www.camiresearch.com/Data_Com_Basics/RS232_standard.html <<< This site has the BEST (And technically accurate) information that I have seen. It includes diagrams and the history of the standard as it has evolved, and is a great reference (If you need this sort of thing)

For my own reference;- (This link at the whirlpool.net.au) talks about – “a router to router connection” – which includeds the DTE vs DCE terminology – HERE >>> http://forums.whirlpool.net.au/forum-replies-archive.cfm/1192957.html <<<

UPDATED: –  00:15am Thur 14 Oct 2010 –  Created a new-category” titled PLC tonight, .. and added this post DTE vs DCE as I consider this to be “A LIKE” topic of interest.