A communications arrangement in which data from a source user may be passed to a destination user over various real circuit configurations during a single period of communication.
Note: Virtual circuits are generally set up on a per-call basis and are disconnected when the call is terminated; however, a permanent virtual circuit can be established as an option to provide… (Read More →)

A network-provided service feature in which a user is provided with a virtual circuit.
Note: Virtual circuit capability is not necessarily limited to packet mode transmission. For example, an analog signal may be converted to a digital signal and then be routed over the network via any available route.

A logical connection that is made to a virtual circuit.

A wideband protocol that is used to transport digital data packets arriving from the channelized side in HDLC frames. [T1.509-1995]

An alias for an IP address or server operated by an Internet Presence Provider or an Internet Service Provider. The virtual domain allows individuals or companies to have a domain name without the effort and cost of maintaining a server. [Bahorsky]

The apparent height of an ionized layer, as determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence.

Synonym teletraining.

A computer network using internetworks as data links that are transparent for users and that do not have restrictions on protocols, so that the network has the characteristics of a local area network.
Note: Data links over internetworks often use tunneling. [2382-pt.35]

In computer systems, the memory as it appears to, i.e., as it is available to, the operating programs running in the central processing unit (CPU).
Note: The virtual memory may be smaller, equal to, or larger than the real memory present in the system.

A network that provides virtual circuits and that is established by using the facilities of a real network.