Lucent Technologies MERLIN LEGEND Release 6.1 System Planning Manual page 572

MERLIN LEGENDCommunications System Release 6.1
System Planning 555-661-112
Glossary
unrestricted data
channel
UPS
V
VAC
VDC
VMI
videoconferencing
system
virtual private
network
VPN
voice-band
channel
voice mail
voice messaging
interface
W
WATS
wink-start tie trunk
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.
See VMI .
(Wide Area Telecommunications Service) Service that
allows calls to certain areas for a flat-rate charge based on
expected usage.
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.
Issue 1
August 1998
Page GL-28