Nortel Networks 9150 - Manual (Page 535)

Remote Gateway 9150 Installation and Administration Guide 505
January 2005 Glossary
U
Uninterruptible Power Supply
A power supply that includes a battery to maintain power in the event of a power
outage. Typically, a UPS keeps a computer running for several minutes after a
power outage, enabling you to save data that is in RAM and to shut down the
computer safely.
UPS
Refer to Uninterruptible Power Supply.
utility
A program that performs a specific task, usually related to managing system
resources. Operating systems contain a number of utilities for managing disk
drives, printers, and other devices.
V
voice compression
Prior to transmission, the voice data is compressed; after transmission, the data
is converted back to voice data at the destination. Voice compression means that
voice consumes less bandwidth, leaving more bandwidth for data or other voice
or fax communications.
voice jitter attenuation
A feature that removes the variable delays from the voice packets sent across the
IP network, thus avoiding awkward-sounding speech.
Voice over IP (VoIP)
Technology that uses the IP data network to carry the voice conversation and
telephone set control signals between a remote site and the host PBX.
W
WAN
Wide area network. A computer network that spans a relatively large
geographical area. Typically, a WAN consists of two or more local area networks
(LANs). The largest WAN in existence is the Internet.