Lucent Technologies 6.1 manual Ups, Vac, Vdc, Vmi, Vpn, Wats

MERLIN LEGENDCommunications System Release 6.1		Issue 1
System Planning 555-661-112		August 1998
Glossary
		Page GL-28
unrestricted data	Unrestricted data channels (also called clear data
channel	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.
UPS	(uninterruptible power supply) Device that connects to the
	system to provide 117 VAC to the equipment when the
	commercial power source fails.

V

VAC	(alternating-current voltage)
VDC	(direct-current voltage)
VMI	(voice messaging interface) An enhanced tip/ring port.
videoconferencing	System application that allows face-to-face meetings, with
system	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	See VPN.
network
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	A transmission channel, generally in the 300–3400-Hz
channel	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	See VMI.
interface

W

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.