Lucent Technologies MERLIN LEGEND Release 6.0 Maintenance And Troubleshooting Manual page 480

MERLIN LEGEND Communications System Release 6.0
Maintenance and Troubleshooting 555-660-140
Glossary
unrestricted data
channel
UPS
V
VAC
VDC
VMI
videoconferencing
system
virtual private
network
VPN
voice-band
channel
voice mail
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.
Application that allows users to send messages to other
system extensions, forward messages received with
comments, and reply to messages.
Issue 1
February 1998
Page GL-38