Lucent Technologies 555-661-150 manual Vac, Vdc, Vmi, Vpn, Wats

MERLIN LEGEND Communications System Release 6.1		Issue 1
Network Reference 555-661-150		August 1998
Glossary
		Page GL-28
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.