Data terminal equipment

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 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 equipment — See DTE …   Dictionary of telecommunications

  • 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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