Data circuit-terminating equipment

Short description: Communications system component

Terminal adapter for X.21 Two data stations (terminals, stations) each comprising a DCE and a DTE, connected via a network.

A data circuit-terminating equipment[1] (DCE) is a device that sits between the data terminal equipment (DTE) and a data transmission circuit. It is also called data communication(s) equipment[2][3][4] and data carrier equipment.[citation needed] 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.[3] Interfacing equipment may be required to couple the DTE into a transmission circuit or channel and from a transmission circuit or channel into the DTE.

## Contents

* 1 Usage
* 2 See also
* 3 References
* 4 External links

## Usage

Although the terms are most commonly used with RS-232, several data communication 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 crossover cable must be used, e.g. a null modem for RS-232 or an Ethernet crossover cable/body

## See also

* Networking hardware

## References

1. ↑ TIA-232-F Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange. 1997.
2. ↑ EIA standard RS-232-C: Interface between Data Terminal Equipment and Data Communication Equipment Employing Serial Binary Data Interchange. Washington: Electronic Industries Association. Engineering Dept. 1969. OCLC 38637094.
3. ↑ 3.0 3.1 DIN 44302 Datenübertragung - Begriffe. 8. 1966. 244–246. doi:10.1524/itit.1966.8.16.244.
4. ↑ MIL-STD-188-100, pg. 24, Fig 4.3-1, 1972.

## External links

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

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