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Design and implementation of the operation and maintenance software for a new GSM transcoder - page 7 / 26

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© NOKIA7 paavo.markkola@nokia.com18.10.2005

Transcoders in GSM networks (2)

TRAU is part of the Base Station Subsystem (BSS) although it is usually located next MSC

TRAU operates on physical level and does not handle GSM signaling

TRAU can be integrated with a submultiplexer

Four 16 kb/s, or eight 8 kb/s, channels can be submultiplexed in to one 64 kb/s channel

The closer to the MSC the TRAU is located the better utilization of the transmission capacity

BSS

NSS

BSC

MSC/VLR

GMSC

TRAU

BTS

MS

Um

A

PSTN

GPRS Packet Core

SGSN

GGSN

Gb

Data Networks

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