Virtual Circuit Identifier

What Does Virtual Circuit Identifier Mean?

A virtual circuit identifier (VCID) is a type of numeric identifier used to distinguish between different virtual circuits in a connection-oriented circuit-switched telecommunication network. It enables a circuit-switched network to identify different virtual circuits/channels involved in a device’s data communication.

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VCID can also be referred to as a virtual channel identifier (VCI).

Techopedia Explains Virtual Circuit Identifier

VCID is primarily used in ATM networks to provide the correct channel/circuit on which the data must travel. It consists of a 12- to 16-bit numeric value/identifier placed within the header of an ATM cell. It provides end-to-end connectivity in an ATM or creates a virtual channel link (VCL) or a virtual channel connection (VCC). VCID is generally used with a virtual path identifier (VPI) to identify the channel and the path over different ATM switches on which the data cell will travel.

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Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.