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Nam Nguyen

Hi I couldn't help noticing you answer 3 above,
"Transcoding and Rate Adaptation units convert the speech codecs used in the BSS into 64 kbit/s PCM coded channels used in the core network. (Note: The TRAU is usually co-located with the MSC in order to minimize the number of required transmission links between the MSCs and the BSCs). "
I think your note was meant to say the TRAU is usually co-located with the BSC (not MSC) in order to minimize the number of transmission links between the MSCs and the BSCs.

Regards

Martin

Hi,

My statement that the TRAU is co-located with the MSC is correct. Between the TRAU and the BSC a speech circuit requires only 16 kbit/s compared to 64 between the TRAU and the MSC. Thus, the TRAU has to be at the MSC in order not to transport 64 kbit/s links.


Cheers,
Martin

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