The full form of DCE in "DCE cable" is Data Circuit-Terminating Equipment.
A DCE cable is a type of serial cable used in networking and data communications to connect two devices. The "DCE" part of the name refers to one of the roles played by a device in a serial connection, as opposed to the Data Terminal Equipment (DTE) role.
Understanding DCE (Data Circuit-Terminating Equipment)
According to the provided reference, a data circuit-terminating equipment (DCE) is a device that acts as an intermediary between the data terminal equipment (DTE) and a data transmission circuit.
- Role: Its primary function is to convert the data signal from the DTE into a format suitable for transmission over a communication medium and vice-versa. It often handles clocking signals for the connection.
- Other Names: DCE is also known by the terms data communication(s) equipment and data carrier equipment.
- Examples: Common examples of DCE devices include modems, Channel Service Units/Data Service Units (CSU/DSUs), and terminal adapters (like for X.25 networks).
DCE vs. DTE
In a serial communication link, devices typically assume one of two roles:
- Data Terminal Equipment (DTE): This is usually the end-user device that generates or consumes data. Think of computers, routers, or terminals. They rely on the DCE for the clock signal.
- Data Circuit-Terminating Equipment (DCE): This device provides the physical interface to the communication circuit and often generates the clock signal for the link. Modems are classic examples.
A serial cable connects a DTE device to a DCE device. The cable is wired differently depending on whether it's connecting a DTE to a DCE, a DTE to a DTE (using a null modem cable), or a DCE to a DCE. A standard DTE-to-DCE cable is sometimes simply referred to as a "DCE cable" because it's designed to connect to a DCE device, or specifically to provide the DCE functionality (like clocking) from one end if used in a DTE-DTE crossover scenario.
Common Usage of DCE Cables
- Connecting a router (DTE) to a modem or CSU/DSU (DCE).
- Connecting a computer (DTE) to a modem (DCE).
- In older networking setups, linking various communication devices.
Understanding the DTE/DCE distinction is crucial for selecting the correct cable type and ensuring devices can communicate properly over a serial link.
