What does TRAU mean in Railroads?

This page is about the meanings of the acronym/abbreviation/shorthand TRAU in the Regional field in general and in the Railroads terminology in particular.

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What does TRAU mean?

Transcoder and Rate Adaptation Unit, or TRAU, performs transcoding function for speech channels and RA for data channels in the GSM network. The Transcoder/Rate Adaptation Unit is the data rate conversion unit. The PSTN/ISDN switch is a switch for 64 kbps voice. Current technology permits to decrease the bit-rate. Since MSC is basically a PSTN/ISDN switch its bit-rate is still 64 kbit/s. That is why a rate conversion is required in between the BSC and MSC Transcoding is the compression of speech data from 64 kbit/s to 13/12.2/5.6 kbit/s in case FR/EFR/HR speech coding.

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"TRAU." Abbreviations.com. STANDS4 LLC, 2015. Web. 10 Oct. 2015. <http://www.abbreviations.com/term/54648>.