Glossary:

ATIS Telecom Glossary

Search Keyword By: V

Select a term name to open its entry and any media references. Longer definitions end with a “Read More” link.

virus

1. An unwanted program which places itself into other programs, which are shared among computer systems, and replicates itself.
Note: A virus is usually manifested by a destructive or disruptive effect on the executable program that it affects.
2. Self-replicating, malicious program segment that attaches itself to an application program or other executable system component and leaves no obvious signs… (Read More →)

virus signature

A unique bit string that is common to each copy of a particular virus and that may be used by a scanning program to detect the presence of the virus. [2382-pt.8]

visible spectrum

The region of the electromagnetic spectrum that can be perceived by human vision, approximately the wavelength range of
0. 4 m to
0. 7 m.

visual channel

A means for delivering video frames from one point to another; a sequence of frames submitted to the channel input results in a similar (not necessarily identical) sequence of frames at the channel output.
Note: The visual channel may be comprised of the following components: video format conversion devices, encoders (compressors) and decoders (decompressors), rate smoothing buffers, multiplexors and demultiplexors,… (Read More →)

visual telephone services

A group of audiovisual services including videophone as defined in ITU-T Recommendation F.721 and videoconferencing (defined in ITU-T H-Series Recommendations). [T1.80
0. 01-1995]

vitreous silica

Glass consisting of almost pure silicon dioxide (SiO2). Synonym fused silica.

VLAN

Virtual Local Area Network

VLF

Abbreviation for very low frequency. See electromagnetic spectrum.

VLR

Visitors Location Register

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