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Número de pieza

componentes Descripción

Fabricante

Q67100-H6298

Multipoint Switching and Conferencing Unit - Attenuation MUSAC-A

Siemens AG 

PEB 2445

Overview

Conferencing

An important task in PCM voice handling is conferencing. I.e. several subscribers of a

digital PBX system would like to arrange a conference call. This task will be done in the

central switching network. Modern switching IC like the MUSAC-A fulfill this important

task in a cost effective way in the central switching unit. A powerful on chip Digital

Signaling Processor handles this requirement.

Definite time-slots will be added together to one subscriber signal. In order to ensure an

acceptable speech quality and reduce of echo and ‘singing’ problems, the input and

output channels have to be attenuated individually. Additionally, input signals below a

threshold programmable to different levels are disregarded. Another trick to lessen the

risk of instability in multiparty conferences is to invert every second voice channel. Odd

and even channels are substracted from one other.

Conferencing with the MUSACTM-A

Conferencing means that PCM data of several subscribers are processed such that

each subscriber receives the contribution of the PCM data transmitted by all participants

of the conference. Except the data transmitted by himself.

Each subscriber is qualified by an input channel which corresponds to a certain input line

and time-slot of the MUSAC-A, and an output channel which corresponds to a certain

output line and time-slot of the MUSAC-A.

The data flow through the MUSAC-A in case of conferencing is illustrated in figure 2.

Semiconductor Group

8

02.96

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