Lucent Technologies 555-661-150 Manual Do Utilizador
MERLIN LEGEND Communications System Release 6.1
Network Reference
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.
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
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
voice and video, to occur between individuals or groups.
This application requires high-speed data transmission
facilities. See also
virtual private
network
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.
communications systems. A VPN may constitute a part of a
private network.
voice-band
channel
channel
A transmission channel, generally in the 300–3400-Hz
frequency band.
frequency band.
voice mail
Application that allows users to send messages to other
system extensions, forward messages received with
comments, and reply to messages.
system extensions, forward messages received with
comments, and reply to messages.
voice messaging
interface
interface
See
VMI.
WATS
(Wide Area Telecommunications Service) Service that
allows calls to certain areas for a flat-rate charge based on
expected usage.
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.
signal and waits for the remote end to send back a signal (a
wink) that it is ready for transmission.