Abbreviation for Volt. A unit
of electrical force or potential, equal to the force that will
cause a current of one Amp to flow through a conductor with a
resistance of one Ohm.
Abbreviation for Volts, AC.
Voltage using alternating current.
cavity surface-emitting laser.
Abbreviation for Volts, DC.
Voltage using direct current.
Abbreviation for very high data rate
digital subscriber line. A DSL operating at a data rate higher
than that of HDSL.
See also DSL.
A digital video compression
technique based on Shannons distortion-rate theory which
states that the performance of data compression systems
improves if blocks of data are coded, with larger coded data
blocks giving better performance.
Cavity Surface-emitting Laser:
that emit light perpendicular to the plane of the wafer they
are grown on. They have very small dimensions compared to
conventional lasers and are very efficient.
modified double-sideband transmission in which one sideband,
the carrier, and only a portion of the other sideband are
transmitted. See also sideband.
Abbreviation for video graphics
array. A high-resolution color standard for computer monitors.
Abbreviation for very high frequency. The frequencies, ranging
from 30 MHz to 300 MHz, in the electromagnetic
Contains off-air television channels 2-12.
on Demand (VOD):
A term used for interactive or customized video delivery
Conducting conferences via a video telecommunications system.
A telephone-like service with a picture as well as sound.
Circuit (VC): A
communications arrangement in which data from a source user
may be passed to a destination user over various real circuit
configurations during a single period of communication,
usually on a per call basis, although permanent connections
can be established.
visible to the human eye; wavelengths of 400-700 nm.
A circuit capable of carrying one telephone conversation or
its equivalent; the standard sub-unit in which
telecommunication capacity is counted. The U.S. analog
equivalent is 4 kHz. The digital equivalent is 64 kb/s in
North America and in Europe.
Abbreviation for virtual private
network. A protected information-system link utilizing
tunneling, security controls, and end-point address
translation giving the end user the impression that a
dedicated line exists between nodes.