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  #1  
11th February 2016, 04:30 PM
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DCE Pin

Hello sir I am Lavneet, will you please provide me information about DCE Pin of the Data terminal equipment (DTE)??
  #2  
11th February 2016, 04:55 PM
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Join Date: Apr 2013
Re: DCE Pin

Data terminal equipment (DTE) is an end instrument that converts user information into signals or reconverts received signals. These can also be called tail circuits. A DTE device communicates with the data circuit-terminating equipment (DCE). The DTE/DCE classification was introduced by IBM.

V.35 is a high-speed serial interface designed to support both higher data rates and connectivity between DTEs (data-terminal equipment) or DCEs (data-communication equipment) over digital lines.

The data terminal equipment may be a single piece of equipment or an interconnected subsystem of multiple pieces of equipment that perform all the required functions necessary to permit users to communicate.

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

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.

This term is also generally used in the Telco and Cisco equipment context to designate a network device, such as terminals, personal computers but also routers and bridges, that's unable or configured not to generate clock signals.

Hence a PC to PC Ethernet connection can also be called a DTE to DTE communication. This communication is done via an Ethernet crossover cable as opposed to a PC to DCE (hub, switch, or bridge) communication which is done via an Ethernet straight cable.


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