AT&T Telephone DS1/DMi/ISDN-PRI Manual de usuario descargar pdf (Pagina 366)

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

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.

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AT&T Telephone DS1/DMi/ISDN-PRI Manual de usuario Pagina 366

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