virtual circuit (virtual connection)

Glossary

virtual circuit (virtual connection)

The pre-arranged route through the ATM network that all cells in an ATM transmission follow.

virtual circuit number

The route identifier contained in an ATM cell header. A VCI and a VPI together constitute the virtual circuit number.

virtual path identifier

See VPI.

VPI

W

The ATM virtual path identifier. ATM is a connection-oriented service that sets up a virtual circuit between the transmitter and the receiver. The two endpoints negotiate an agreed route through the network before sending any data. VCI and VPI together constitute the virtual circuit number that identifies this route. The VPI is analogous in some ways to an ISDN trunk group.

WAN

See wide area network.

well-known address

The default network address for a given type of network component, as specified by a communications protocol or standards body. For example, the ATM Forum defines well-known addresses for LAN-emulation servers and LAN-emulation configuration servers.

well-known port

port numbers that are assigned to specific applications by IANA. For example, 21 for FTP, 23 for Telnet, 110 for pop3.

wide area network

A data network that connects local area networks (LANs) using common-carrier telephone lines, bridges, and routers.

wideband

Acircuit-switched call at a data rate greater than 64 kbps. A circuit-switched call on a single T1 or E1 facility with a bandwidth between 128 and 1536 (T1) or 1984 (E1) kbps in multiples of 64 kbps. H0, H11, H12, and N x DS0 calls are wideband.

Administration for Network Connectivity

 

 

555-233-504 — Issue 1 — April 2000

CID: 77730

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Lucent Technologies Release 8.2 manual Vpi, Wan