Lucent Technologies MERLIN LEGEND 6 System Manager's Manual page 451

MERLIN LEGEND Communications System Release 6.0
System Manager's Guide 555-660-118
Glossary
unambiguous
numbering
Uniform Dial Plan
uninterruptible
power supply
unit load
unmonitored
extension
unrestricted data
channel
UPS
V
VAC
VDC
VMI
videoconferencing
system
virtual private
network
VPN
voice-band
channel
The practice of numbering of extension ranges, remote
access codes, or other system components to avoid routing
conflicts in network or local calling. For example, Extension
441 is unique when compared to Extension 4410. However
it is ambiguous, because a system routes as soon as it
matches the digits sent for a call with the digits in a local
plan or in a non-local dial plan extension range. When a
caller dials ##  , a system routes the call to Extension 441
immediately, without considering the last dialed digit.
See UDP .
See UPS .
Measure of the power load drain of a module, telephone, or
adjunct .
An extension for which no CTI application is receiving call
information. See also CTI link and monitored extension .
Unrestricted data channels (also called clear data
channels) allow the transmission of occurrences of more
than seven contiguous zero bits. If an unrestricted data
channel is requested and only restricted channels are
available, the call will be rejected. See also restricted data
channel.
(uninterruptible power supply) Device that connects to the
system to provide 117 VAC to the equipment when the
commercial power source fails.
(alternating-current voltage)
(direct-current voltage)
(voice messaging interface) An enhanced tip/ring port.
System application that allows face-to-face meetings, with
voice and video, to occur between individuals or groups.
This application requires high-speed data transmission
facilities. See also desktop videoconferencing and group
videoconferencing.
See VPN .
(virtual private network) A type of private network that uses
the switching capabilities of the PSTN , rather than tandem
switching , to direct calls between connected
communications systems. A VPN may constitute a part of a
private network.
A transmission channel, generally in the 300–3400-Hz
frequency band.
Issue 1
February 1998
Page GL-27