V

V.17 CCITT analog facsimile analog modem signaling standard providing up to 14400 kbps data rates and backwards compatible to the V.29 standard, which supports speeds up to 9600 kbps.

V.22bis CCITT standard for data transfer at 2400 bits/second via a modem.

V.32bis CCITT analog modem signaling standard providing up to 14400 kbps data rates.

V.34 CCITT standard for modem data transfer at 28800 bits/second.

V.42bis CCITT analog modem data compression standard. Provides a theoretical maximum of 4:1 compression, although 2:1 is more commonly experienced.

V.35 The CCITT recommendation governing data transmission at 48 Kbps using 60 to 108 KHz band circuits.

VC (Virtual Channel) A point-to-point or point-to- multipoint connection between ATM end-stations. Can either be switched or permanent. It is identified by the combination of the VCI and VPI.

VCC (Virtual Channel Connection) They are defined by a series of VCs logically assigned to make an end-to-end link.

VCI Virtual Connection Identifier A 16-bit identifier having only local significance on the link between ATM nodes. See VC.

Veronica A network service that allows users to search Gopher systems for documents.

VFS (Virtual File Storage) Intermediate format used for data in transmit from one system to another system. It is used as the transit format for File Transfer, Access and Management (FTAM) and provides a set of common file operations that all FTAM systems understand (such as copy or delete).

Virtual Channel Identifier A unique numerical tag for every virtual channel across an ATM interface.

Virtual Circuit Circuit-like service provided by the software protocols of a network, enabling two end points to communicate as though connected by a physical circuit. Network nodes provide the addressing information needed in the packets that carry the source data to the destination.

Virtual Route SNA terminology for virtual circuit. A logical connection between subarea nodes that is physically realized as a particular explicit route.

VLSI Very Large-Scale Integration

VN3/VN4 VN3 and VN4 are the French ISDN standards.

VPC Virtual Path Connection VPI Virtual Path Identifier. An 8-bit identifier identifying semi-permanent connections between ATM endpoints. See VC.

VSAT Very Small Aperture Terminal. A satellite system (for voice, data or video) where the satellite dish is less 3 metres in diameter. VSATs are a type of downlink but may have uplink capability.

VT series A series of text-based terminals introduced by Digital Equipment Corporation (DEC). Designed for use with large mainframe computers and standard enough to work with machgines from a variety of vendors. The VT100 and VT102 were the most common though they were superceded by VT220 and VT320. Programs that allow users to connect to remote machines (like Telnet) often do so by emulating VT series terminals.

VTAM Virtual Telecommunications Aaccess Method (IBM)