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Design and implementation of the operation and maintenance software for a new GSM transcoder - page 8 / 26

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© NOKIA8 paavo.markkola@nokia.com18.10.2005

Nokia Transcoders (1)

Transcoder and submultiplexer (TCSM)

Submultiplexer is fully intergraded to the device

Based on the Nokia DX200 platform

Three generations of transcoders

The first generation transcoder is obsolete and no longer supported

The current transcoder product is TCSM2

The new transcoder, TCSM3i, does not directly replace TCSM2, instead it provides an alternative solution

Always located in between BSC and MSC, and can be considered as an internal part of the BSC

Digital Signal Processors (DSP) are used to implement the TRAU functionality

Exchange Terminals (ET) provide PCM lines (either E1 or T1) towards BSC and MSC

Provides one PCM line towards BSC (Ater interface) and four (with full rate channels) or seven (with half rate channels) PCM lines towards MSC (A interface)

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