Data terminal equipment

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.

Basically, 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.

Two different types of devices are assumed on each end of the interconnecting cable for a case of simply adding DTE to the topology (e.g. to a hub, DCE), which also brings a less trivial case of interconnection of devices of the same type: DTE-DTE or DCE-DCE. Such cases need crossover cables, such as for the Ethernet or null modem for RS-232.

A DTE is the functional unit of a data station that serves as a data source or a data sink and provides for the data communication control function to be performed in accordance with the link protocol.

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. A user interacts with the DTE (e.g. through a human-machine interface), or the DTE may be the user.

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.

See also


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Look at other dictionaries:

  • Data Terminal Equipment —   [Abk. DTE, dt. »DatenTerminal Ausrüstung«] das, Computer bzw. Terminal, der bzw. das Daten nach dem Standard RS 232 C überträgt und dabei Data Communications Equipment benutzt …   Universal-Lexikon

  • Data Terminal Equipment — (DTE) device (such as a computer, printer, telephone, etc.) that is used as a transmission source or destination for data transfer and is connected to a modem (DCE) by the RS 232C interface …   English contemporary dictionary

  • Data Terminal Equipment — Jedes Datenübertragungssystem wird von (mindestens) zwei Datenstationen gebildet, die durch einen Übertragungsweg (allg. Kommunikationseinrichtung) miteinander verbunden sind. Bestandteile und Funktion Jede Datenstation besteht nach DIN 44302 aus …   Deutsch Wikipedia

  • data terminal equipment —    Abbreviated DTE. In communications, any device, such as a terminal or a computer, connected to a communications device, channel, or public network.    See also data communications equipment …   Dictionary of networking

  • data terminal equipment —    (DTE)    1. The data source, data sink, or both.    2. Equipment that usually includes control logic, buffer, and one or more input or output devices or computers; can also contain error control, synchronization, and station identification… …   IT glossary of terms, acronyms and abbreviations

  • data terminal equipment — See DTE …   Dictionary of telecommunications

  • Data Communications Equipment —   [Abk. DCE, dt. »Datenkommunikationsausrüstung«] das, Gerät für serielle Datenübertragungen nach RS 232 C. Es erhält seine Signale vom Data Terminal Equipment (DTE) und wandelt diese für die Kommunikation um oder verwandelt umgekehrt… …   Universal-Lexikon

  • data communications equipment —    Abbreviated DCE. In communications, any device that connects a computer or terminal to a communications channel or public network; usually a modem.    See also data terminal equipment …   Dictionary of networking

  • Data Terminal Ready — Steckerleiste Der Begriff EIA 232, ursprünglich RS 232, bezeichnet einen Standard für eine serielle Schnittstelle, die in den frühen 1960ern von einem US amerikanischen Standardisierungskomitee (heute EIA – Electronic Industries Alliance)… …   Deutsch Wikipedia

  • Terminal equipment — In telecommunication, the term terminal equipment has the following meanings: * Communications equipment at either end of a communications link, used to permit the stations involved to accomplish the mission for which the link was established. *… …   Wikipedia


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