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Virtual circuit
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Virtual circuit
A virtual circuit (VC) is a means of transporting data over a data network, based on packet switching and in which a connection is first established across the network between two endpoints. The network, rather than having a fixed data rate reservation per connection as in circuit switching, takes advantage of the statistical multiplexing on its transmission links, an intrinsic feature of packet switching.
A 1978 standardization of virtual circuits by the CCITT imposes per-connection flow controls at all user-to-network and network-to-network interfaces. This permits participation in congestion control and reduces the likelihood of packet loss in a heavily loaded network. Some circuit protocols provide reliable communication service through the use of data retransmissions invoked by error detection and automatic repeat request (ARQ).
Before a virtual circuit may be used, it must be established between network nodes in the call setup phase. Once established, a bit stream or byte stream may be exchanged between the nodes, providing abstraction from low-level division into protocol data units, and enabling higher-level protocols to operate transparently.
An alternative to virtual-circuit networks are datagram networks.
Virtual circuit communication resembles circuit switching, since both are connection oriented, meaning that in both cases data is delivered in correct order, and signaling overhead is required during a connection establishment phase. However, circuit switching provides a constant bit rate and latency, while these may vary in a virtual circuit service due to factors such as:
In telecommunications, a virtual call capability, sometimes called a virtual call facility, is a service feature in which:
An alternative approach to virtual calls is connectionless communication using datagrams.
In the early 1970s, virtual call capability was developed by British Telecom for EPSS (building on the work of Donald Davies at the National Physical Laboratory). The concept was enhanced by Rémi Després as virtual circuits for the RCP experimental network of the French PTT.
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Virtual circuit AI simulator
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Virtual circuit
A virtual circuit (VC) is a means of transporting data over a data network, based on packet switching and in which a connection is first established across the network between two endpoints. The network, rather than having a fixed data rate reservation per connection as in circuit switching, takes advantage of the statistical multiplexing on its transmission links, an intrinsic feature of packet switching.
A 1978 standardization of virtual circuits by the CCITT imposes per-connection flow controls at all user-to-network and network-to-network interfaces. This permits participation in congestion control and reduces the likelihood of packet loss in a heavily loaded network. Some circuit protocols provide reliable communication service through the use of data retransmissions invoked by error detection and automatic repeat request (ARQ).
Before a virtual circuit may be used, it must be established between network nodes in the call setup phase. Once established, a bit stream or byte stream may be exchanged between the nodes, providing abstraction from low-level division into protocol data units, and enabling higher-level protocols to operate transparently.
An alternative to virtual-circuit networks are datagram networks.
Virtual circuit communication resembles circuit switching, since both are connection oriented, meaning that in both cases data is delivered in correct order, and signaling overhead is required during a connection establishment phase. However, circuit switching provides a constant bit rate and latency, while these may vary in a virtual circuit service due to factors such as:
In telecommunications, a virtual call capability, sometimes called a virtual call facility, is a service feature in which:
An alternative approach to virtual calls is connectionless communication using datagrams.
In the early 1970s, virtual call capability was developed by British Telecom for EPSS (building on the work of Donald Davies at the National Physical Laboratory). The concept was enhanced by Rémi Després as virtual circuits for the RCP experimental network of the French PTT.