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GL-8
GLOSSARY
Digital
Communication
Protocol (DCP)
digital
digital data
digital
multiplexed
interface (DMI)
digital
multiplexed
interface with
bit-oriented
signaling
(DMI-BOS)
digital
multiplexed
interface with
message-
oriented
signaling
(DMI-MOS)
digital signal
level 1 (DS1)
Direct Inward
Dialing (DID)
DNIS
DS1
DS1 robbed-bit
signaling
DSX-1
DTE
E&M
An AT&T proprietary protocol used to transmit both digitized voice and
digitized data over the same communications link. A DCP link is made up of
two information (I-) channels and one signaling (S-) channel.
The representation of information in discrete elements such as off and on or 0
and 1.
See digital.
An interface that provides connectivity between a communications system and a
host computer or between two communications systems using digital signal level
1 (DS1) 24th-channel signaling. DMI provides 23 64K-bps data channels and 1
common signaling channel over a twisted-pair connection. DMI is offered
through two capabilities: bit-oriented signaling (DMI-BOS) and message-oriented
signaling (DMI-MOS).
DMI signaling in which the signaling in the 24th channel is based on the
definitions of single bits. For example, a bit may indicate an on-hook/off-hook
condition.
DMI signaling in which the signaling in the 24th channel is based on the
definitions of strings of bits that form messages. DMI-MOS is similar to the
Integrated Services Digital Network primary rate interface (ISDN-PRI).
A bit-oriented signaling (BOS) interface that multiplexes 24 channels into a
single 1.544M bps stream. DS1 can be used for pulse-code modulation (PCM)
for voice or voice-grade data and for mode-0, -1, -2, and -3 data protocols as
well as for other voice or data transmission protocols.
A feature that allows an incoming call from the public network (not FX or
WATS) to reach a specific telephone without attendant assistance. DID calls to
DID-restricted telephone lines are routed to an attendant or recorded
announcement, depending on the option selected.
See
See
See
1.
2.
See
dialed-number identification service.
digital signal level 1.
robbed-bit signaling.
A cross-connect field for digits signal level 1s (DS1s).
A specification that defines the signal shape and power level of the DS1
signal at a virtual or real point.
data terminal equipment.
Ear and mouth.