virtual circuit

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virtual circuit

A connection-oriented network service which is implemented on top of a network which may be either connection-oriented or connectionless (packet switching).

The term "switched virtual circuit" was coined needlessly to distinguish an ordinary virtual circuit from a permanent virtual circuit. (One of the perpetrators of this confusion appears to be ["Networking Essentials", 1996, Microsoft Press, ISBN 1-55615-806-8], a book aimed at people preparing for the MCSE exam on LANs and WANs).

Not to be confused with switched virtual connection.

virtual circuit

(1) A temporary communications path created between devices in a switched communications system. For example, a message from New York to Los Angeles may actually be routed through Atlanta and St. Louis. Within a smaller geography, such as a building or campus, the virtual circuit traverses some number of switches, hubs and other network devices.

(2) A logical circuit within a physical network. The actual lines may be shared by other users at the same time, but the virtual circuit appears exclusive to the users who are communicating with each other. The terms "permanent virtual circuit" and "virtual private network" also describe this kind of logical circuit. See packet switching, virtual private network, PVC and SVC.
References in periodicals archive ?
The image overlays the real road with the virtual route line it helps drivers not to refocus their eyes to the windshield or to be distracted by looking to their embedded GPS.
The women cycled the furthest around the virtual route in the time allowed, beating many of the male competitors.
There is also a Google Map display on which sat-nav instructions and traffic information is overlaid creating almost a virtual route including points of interest and the cheapest and nearest filling stations.
The virtual route will pass through Macedonia, Serbia, Croatia, Slovenia, Austria, Germany, Belgium, France, Wales and England.
The introduction of Multi Protocol Label Switching to the BCN allowed for each customer's traffic to be isolated into its own virtual circuit, known as Virtual Route Forwarding, on the BCN routers which allowed for logical separation of traffic based on classification level.
And, as Philips weighs up the merits of four existing models, perhaps the most intriguing option is if Morrisons goes down the virtual route adopted by Ocado.
From August 2010, travellers arriving at Heathrow T5 will be able to access the Microsoft Surface, a 30-inch touch-screen offering an interactive table and unique software designed by the company for a virtual route planner to various locations through detailed maps offered by search engine, Bing.
The virtual route ran from Sustrans' headquarters in Bristol and passed through every single Bike It town and city in the UK on its way.
Firstly there are the aficionados, then there are the bookmakers to whom we must keep providing whatever product they require otherwise they will go more and more down the virtual route, and finally there are those just looking for a jolly night out.
Using virtual route forwarding (VRF) for Layer 3 VPN support presents a simplified alternative to tunneled hand-off mechanisms (L2TP), and also enables Internet and applications service providers to offer tiered IP quality of service (QoS) guarantees to their subscribers.
You'll feel good and look good," she says, ambitiously, as Tyrone plans him a virtual route to Cleethorpes.
Associations with traditional chapters that wish to go the virtual route may find it challenging to find and train members to play this online leadership role.

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