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.

Associated Transport Line

Regional » Railroads

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Definition

What does TRAU mean?

TRAU
Transcoder and Rate Adaptation Unit or TRAU, performs transcoding function for speech channels and RA (Rate Adaptation) for data channels in the GSM network. The Transcoder/Rate Adaptation Unit (TRAU) is the data rate conversion unit. The PSTN/ISDN switch is a switch for 64 kbit/s voice. Current technology permits to decrease the bit-rate (in GSM radio interface it is 16 kbit/s for full rate and 8 kbit/s for half 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 13/12.2/6.5 kbit/s in case FR/EFR/HR (respectively) speech coding. Rate adaptation without transcoding allows Tandem Free Operation (TFO), allowing the original encoded speech data to be carried in a 64 kbit/s channel. TFO offers benefits because transcoding can lead to a degradation of speech quality and requires computational resources.

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"TRAU." Abbreviations.com. STANDS4 LLC, 2024. Web. 31 Oct. 2024. <https://www.abbreviations.com/term/54648>.

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