Nortel Remote Office 9150 Installation And Administration Manual page 489

September 2001
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
See 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
V.35
An ITU-T standard describing a synchronous, physical layer protocol used for
communications between a network access device and a packet network. V.35 is
most commonly used in the United States and in Europe, and is recommended
for speeds up to 48 Kbps. In practice, V.35 is used for synchronous transmission
up to 2048 Mbps.
V.35 interface
The V.35 interface is for future use.
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.
Installation and Administration Guide
Glossary
465