AT&T 3.0 manual Ups, Vac, Vdc, Vmi

Glossary

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.
voice-band channel A transmission channel. generally in the 300-3400-Hz
	frequency band.
voice mail	Application that allows users to send messages to other
	extensions in the system, 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.

GL-32Maintenance and Troubleshooting