AT&T 7100 series, 7500 series, 2500 series, 7200 series, 7400 series manual Glossary, Acu, Adm, Avd

GLOSSARY

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24th-channel signaling	Digital signal level-1 (DS1) signaling in which the signaling for each of
	the first 23 channels is multiplexed onto the 24th channel, thereby
	providing a full 64 kbps for user data on each of the first 23 channels.
	Also called clear-channel signaling. See also common-channel signaling
	and primary rate interface.
800 Service	A service that allows incoming calls to be made from certain geographical
	areas to an assigned number for a flat-rate charge based on expected usage.
	Also called MEGACOM 800 service. See also MEGACOM®.
access code	A 1-, 2-, 3-, or 4-digit dial code used to activate or cancel a feature or
	access an outgoing trunk. Star (*) or pound (#) can be used as the first
	digit of an access code.
access tie trunk	A trunk that connects a main switch with a tandem switch in an electronic
	tandem network (ETN). An access tie trunk can also be used to connect a
	system or tandem to a serving office or service node. Also called access
	trunk.
ACD	See Automatic Call Distribution.
ACU	See automatic calling unit.
adaptive differential	A 32-kbps encoding algorithm that allows up to 48 voice band channels to
pulse-code modulation	be carried on one DS1 facility.
ADM	See asynchronous data module.
administer	To access, establish, or change parameters associated with the services and
	features of a system.
ADU	See asynchronous data unit.
alternate facilities	An assigned alternate number that reflects allowed access levels and
restriction level (AFRL)	determines both the kinds of calls that can be made and the kinds of
	facilities that can be used when accessing trunks via Automatic Alternate
	Routing (AAR). See also facilities restriction level.
alternate voice/data	A digital signal level-1 (DS1) trunk-facility translation that defines the use
(AVD)	of that facility for either voice or data-protocol modes.

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