PEB2445NV1.2 Lantiq, PEB2445NV1.2 Datasheet - Page 8

• Manufacturer Part Number: PEB2445NV1.2
• Manufacturer: Lantiq

Specifications of PEB2445NV1.2

• Lead Free Status / Rohs Status: Supplier Unconfirmed

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.
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 MUSAC
Semiconductor Group
TM
-A
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PEB 2445
Overview
02.96