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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Glossary
Page GL-28
V
W
UPS (uninterruptible power supply) Device that connects to the
system to provide 117 VAC to the equipment when the
commercial power source fails.
VAC (alternating-current voltage)
VDC (direct-current voltage)
VMI (voice messaging interface) An enhanced
tip/ring
port.
videoconferencing
system
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.
virtual private
network
See
VPN
.
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.
voice-band
channel
A transmission channel, generally in the 300–3400-Hz
frequency band.
voice mail Application that allows users to send messages to other
system extensions, forward messages received with
comments, and reply to messages.
voice messaging
interface
See
VMI
.
WATS (Wide Area Telecommunications Service) Service that
allows calls to certain areas for a flat-rate charge based on
expected usage.
wink-start tie trunk
Tie trunk
on which the originating end transmits an off-hook
signal and waits for the remote end to send back a signal (a
wink) that it is ready for transmission.