virtual circuit


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virtual circuit

(networking)
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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

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" (VPN) also describe this kind of logical circuit. See packet switching, VPN, PVC and SVC.
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References in periodicals archive ?
The second limitation is that these approaches do not adequately handle multicast virtual circuits. Additional mechanisms must be developed to handle these problems.
Because of T1's inherent advantages over other broadband access solutions, telecommunications engineers have looked for ways to bundle two or more T1 lines together into one virtual circuit as a way of increasing throughput.
The sites are interconnected using virtual circuits--either permanent virtual circuits (PVC) or switched virtual circuits (SVC).
The mechanism used by service providers and switch vendors to ensure some kind of predictable throughput over public frame relay permanent virtual circuits (PVCs) is the committed information rate (CIR).
The flexible data line foundation class is defined to provide behavior equivalent to that of a frame relay virtual circuit, before service dimensions are applied.
The single largest obstacle to growth for a DSL carrier is the complexity of the prevailing Layer 2 model that creates a permanent virtual circuit (PVC) mesh that expands on an exponential basis.
Now, our customers have the flexibility and convenience of directly configuring a virtual circuit for a DSL connection or implementing Web site and e-mail changes.
F1 2016 LIMITED EDITION (Xbox One) HHHH H YET again, Lewis Hamilton is leading the way again in the F1 stakes this year, and now you can step onto the virtual circuits in F1 2016, putting you in control of his high-speed destiny or, indeed, any of the other drivers on this year's racing roster.
ONLY weeks after his victory on home soil in the British Grand Prix, Lewis Hamilton steps onto the virtual circuits in F1 2015, putting you in control of his high-speed destiny or, indeed, any of the other drivers on this year's racing roster.
FRESH from his victory in the British Grand Prix last weekend, Lewis Hamilton steps onto the virtual circuits in F1 2015, putting you in control of his highspeed destiny or, indeed, any of the other drivers on this year's racing roster.
This open-source software allows scientists and network operators to create and reserve bandwidth channels, called "virtual circuits," with guaranteed end-to-end performance.

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