RS> Its possible tho, there clearly is a major problem with the USR line
RS> probe stats when the modem on the other end isnt a USR, the entire
RS> curve shifts the best part of 7db and that may well be confusing the
RS> USR when it attempts to set the Tx level to the optimum level. In
RS> other words it
RS> gets confused about the line loss in that case and boosts the Tx level
RS> in the auto level setting with a non USR modem at the other end. That
RS> could explain why the effect with USR/USR is different to USR/non USR
RS> on the manual override of the Tx level.

 BG> It can be clearly seen from these stats that as the 
 BG> available bandwidth decreases, the Tx level increases 
 BG> automatically to compensate, but why the entire curve 
 BG> shifts ~6dB is beyond me, I'm afraid.

I think someone needs to physically measure the output from each sending
modem before we could say the USR line probe stats are ~6db out when 
not talking to another USR. Perhaps the USR is really transmitting "at
a higher level" 

regards, Peter.


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