• Source: Data circuit-terminating equipment

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 communication(s) 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 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/body




See also


Networking hardware




References






External links



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

Kata Kunci Pencarian:

• Data circuit-terminating equipment
• RS-232
• Data terminal equipment
• Interchange circuit
• Data access arrangement
• Virtual circuit
• Flow control (data)
• Isochronous burst transmission
• LAPB
• Bit-synchronous operation