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GLOSSARY
1s density
24th-channel
signaling
800 service
access
ACCUNET
®
ACCUNET
®
digital service
ACCUNET
®
packet service
ACCUNET
®
reserved 1.5
service
ACCUNET
®
T1
service
See ones density.
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 64K-
bps for user data on each of the first 23 channels. Also called alternate
voice/data signaling, clear-channel signaling, and out-of-band signaling. See also
common-channel signaling and Integrated Services Digital Network primary
rate interface.
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. See also
MEGACOM
®
.
In telecommunications, a call that is completed from a customer-premises
location to the public network.
A trademarked name for a family of digital services offered by AT&T.
A digital service offered by AT&T that provides switched digital connectivity via
the public network to allow pairs of compatible endpoints to exchange data,
video, digital encrypted voice, and/or graphics at up to 64K-bps.
An X.25 packet-switching service provided by AT&T.
A digital service offered by AT&T that provides 1.5M-bps digital facilities
between two or more specified points at scheduled times.
A digital service offered by AT&T that provides a dedicated 1.5M bps digital
facility, using terrestrial channels and one of two specified signal formats.
See analog/digital-facility test circuit.
See alternate facilities restriction level.
See automatic identified outward dialing.
An assigned alternate number that reflects allowed access levels and 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.
A digital signal level 1 (DS1) trunk-facility translation that defines the use of that
facility for either voice and voice-grade data or data protocol modes. See also
bearer capability class of service.
See arithmetic logic unit.
A numeric standard used to express the diameter of a wire. The higher the
number, the smaller the diameter.
ADFTC
AFRL
AIOD
alternate
facilities
restriction level
(AFRL)
alternate
voice/data
(AVD)
ALU
American Wire
Gauge (AWG)
GL-1