Avaya Glossary of Media Processing Server Series Terminology (Software Release 2.1) Manuel d'utilisateur télécharger pdf (Page 39)

Direct Memory Access

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digital A telephone interface that supports information represented by binary

code. The original signal is translated into a numeric representation.

In the United States, a digital interface is known as T1; in Europe, it is

known as E1 or CEPT.

The fundamental difference between T1 and E1 standards are the bit

rate and voice data compression schemes (T1 uses u-law, while E1

uses A-law). Many countries have developed their own unique digital

telephone protocols within T1 or E1 standards. Occasionally, a single

country (such as the U.S.) uses multiple implementations of the T1

specification.

On the Avaya MPS, the physical connection for the digital phone line

interface is made by the channel service unit (CSU). Each digital

interface supports either 24 or 48 individual T1 telephone lines, or 30

or 60 E1 telephone lines.

The Avaya MPS supports several digital protocols:

•wink start

• channel bank

•ISDN

• common channel signaling

Contrast with analog.

For additional information, see the Avaya MPS Telephony Reference

Manual.

See also CSU, ISDN, a-law, u-law, Wink Start, SS7.

Digital Communications

Controller

See DCC.

Digital Private Network

Signaling System

See DPNSS.

Digital Signal Processor See DSP.

direct access Refers to the ability to retrieve particular data from a database based

on the index or some other locating algorithm.

Contrast with sequential access.

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Avaya Glossary of Media Processing Server Series Terminology (Software Release 2.1) Manuel d'utilisateur Page 39