Data circuit-terminating equipment

Terminal adapter for X.21

A data circuit-terminating equipment (DCE) is a device that sits between the data terminal equipment (DTE) and a data transmission circuit. It is also called data communications equipment and data carrier equipment. Usually, the DTE device is the terminal (or computer), and the DCE is a modem.

In a data station, the DCE performs functions such as signal conversion, coding, and line clocking and may be a part of the DTE or intermediate equipment. Interfacing equipment may be required to couple the data terminal equipment (DTE) into a transmission circuit or channel and from a transmission circuit or channel into the DTE.

Although the terms are most commonly used with RS-232, several data communications standards define different types of interfaces between a DCE and a DTE. The DCE is a device that communicates with a DTE device in these standards. Standards that use this nomenclature include:

• Federal Standard 1037C, MIL-STD-188
• RS-232
• Certain ITU-T standards in the V series (notably V.24 and V.35)
• Certain ITU-T standards in the X series (notably X.21 and X.25)

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. DTE devices usually transmit on pin connector number 2 and receive on pin connector number 3. DCE devices are just the opposite: pin connector number 2 receives and pin connector number 3 transmits the signals.

When two devices, that are both DTE or both DCE, must be connected together without a modem or a similar media translator between them, a kind of crossover cable must be used, i.e. a null modem for RS-232 or as usual for Ethernet.

References

External links

• Data Terminating Equipment or Data Circuit-Terminating Equipment speeds, IBM

This article related to telecommunications is a stub. You can help Wikipedia by expanding it.v · Categories: Telecommunications stubs Data transmission Telecommunications equipment Wikimedia Foundation. 2010. Игры ⚽ Нужен реферат? DBrn Decrypt Look at other dictionaries: data circuit terminating equipment — galinis duomenų grandinės įrenginys statusas T sritis radioelektronika atitikmenys: angl. data circuit terminating equipment vok. Datenübermittlungsstreckeendgerät, n rus. оконечная установка линии данных, f pranc. équipement de terminaison de… …   Radioelektronikos terminų žodynas data circuit terminating equipment —    (DCE)    The interfacing equipment required to connect data terminal equipment (DTE) to or from a transmission circuit or channel. With an RS 232 C connection, the modem is usually regarded as DCE, while the terminal or computer is DTE. In a X …   IT glossary of terms, acronyms and abbreviations tandem data circuit —    Data path passing through more than two DCEs (Data circuit terminating equipment) devices in series …   IT glossary of terms, acronyms and abbreviations 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 …   Wikipedia 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 Data access arrangement — The term data access arrangement (DAA) has the following meanings: In public switched telephone networks, a single item or group of items at the customer side of the network interface for data transmission purposes, including all equipment that… …   Wikipedia Data service unit — A data service unit, sometimes called a digital service unit, is a piece of telecommunications circuit terminating equipment that transforms digital data between telephone company lines and local equipment. The device converts bipolar digital… …   Wikipedia Interchange circuit — In telecommunication, an interchange circuit is a circuit that facilitates the exchange of data and signaling information between data terminal equipment (DTE) and data circuit terminating equipment (DCE). An interchange circuit can carry many… …   Wikipedia Customer Premises Equipment — Pour les articles homonymes, voir CPE. Customer Premises Equipment (CPE) est un équipement qui se trouve dans le site d un client (d une entreprise) et qui est raccordé à l infrastructure d un opérateur, dans un Point Of Presence (POP), via une… …   Wikipédia en Français Equipement Terminal de Circuit de Donnees — Équipement terminal de circuit de données ETCD (ou Équipement Terminal de Circuit de Données, Data circuit terminating equipment en anglais) est la connexion des terminaux ETTD au canal nécessite généralement une adaptation qui sera réalisé par… …   Wikipédia en Français 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”