Lucent Technologies 555-661-150 Manual De Usuario

Issue 1

August 1998

Glossary 

Page GL-28

 

(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 

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.