 This aspect is very important, as, if there is a breakage in TFO connection, the upper most significant bits (MSBs) can still be used to carry transcoded G.711/PCM sample values.The degradation due to loss of 1 or 2 LSBs is not much.The remote transcoder equipment then "extracts" the encoded stream from LSBs of PCM samples and reconstructs it as codec frames and then sent as though it was encoded by itself, thereby virtually avoiding two iterations of trancoding.