Data circuit-terminating equipment: Difference between revisions
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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. | 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<!--<ref>[http://www.svbug.com/ | 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<!--<ref>[http://www.svbug.com/developer/documentation/articles/serial-uart/#AEN96]</ref>--> or an [[Ethernet]] crossover cable. | ||
==See also== | ==See also== | ||
Latest revision as of 00:36, 5 June 2025
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.Script error: No such module "Unsubst". 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.
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.
See also
References
External links
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedTIA_1997_232F - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedEIA_1969_RS232C - ↑ a b Cite error: Invalid
<ref>tag; no text was provided for refs namedDIN_44302 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedMIL-STD-188-100