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TRAU

A Transcoder and Rate Adaptation Unit (TRAU) performs transcoding function for speech channels and RA 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. 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.

Brief explanation
For an MS-to-MS call, the transmission path covers the radio access network (RAN) as well as the core network (CN). Since the transmission modes and coding standards are different for RAN and CN, speech data is converted/transcoded at the transition points from RAN to CN. This conversion is performed in the TRAU network element which connects RAN and CN. 16 kbit/s for FR (Full Rate), Redundancy (Channel Coding)= 9.8 kbit/s => Gross data rate after adding redundancy = 22.8 kbit/s => 12.2 kbit/s for EFR (Enhanced Full rate) => Gross data rate after adding redundancy = 11.4 kbit/s. ==See also==
Source: Wikipedia ↗
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