Sony CRE-C10 Safety And Maintenance Instructions page 48

Exchange of high data rate ear-to-ear signals (microphone
signal)
Parameter for QoS is the bit error (BER) of the gross data
link. This parameter is e imated and monitored during data
receive. For BER > 3.5% the channel coding will become
less e ective thus the transferred microphone signal is
automatically muted and not used until the QoS is good
enough again. For the used ITU G.722 Audio Codec CRC
check is not useful.
It is reasonably foreseeable that no risk/hazard can rise
caused by invalid data.
48