（单词翻译:单击）
VAD
value-added distributor
VAN
value-added network
VAR
value-added reseller
VBR
variable bit rate
VCI
virtual circuit identifier
VCS
virtual circuit switch
Very Small Aperture1 Terminal (VSAT)
VSATs are earth terminals using small antennas2 (1.5 6 feet in diameter). This technology typically operates in the Ku band (11/14 GHz), and Ka band (20/30 GHz).
Video Conferencing
Video conferencing is the real-time, usually two-way transmission of voice and images between two or more locations. Today, both voice and video analog3 signals are digitized by video codices before transmission which can involve wide bandwidths. To conserve4 bandwidth, some systems employ "freeze frame," where a television screen is only "repainted" every few seconds. Codecs for higher quality full motion video attempt to minimize bandwidth requirements by taking advantage of intervals5 with relatively6 little motion (which require smaller bandwidths), and by trading off smooth motion tracking and picture resolution.
Virtual Private Networks (VPN)
VPNs are services using public network facilities augmented7 by network control point and service management system facilities wherein traffic is routed through the public network under computer control in a manner that makes VPN service indistinguishable from dedicated8 facilities based private networks. Customers can define, change and control network resources with the same or more flexibility9 as afforded by facilities based private networks.
VPI
virtual path identifier
VPN
virtual private network
VRU
voice response unit
VSAT
very small aperture terminal
Virtual Host - A Web site that includes a customized Domain10 Name and unique IP address to your home page, giving the appearance that you have your own server directly connected to the Internet.
VoIP - (Voice over Internet Protocol11) - A technology used to transmit voice over a data network using Internet Protocol, such as the Internet or intranet networks.
