BUD JAMISON wrote in a message to RICK COLLINS:
-> Symmetric - common Rx/Tx speed.  Asymmetric - differeing Rx/Tx speed.
-> modems had asymmetric V.34 from day 1.  USR is a "brand name".
 BJ> ALL v.34 modems are asymmetric, it's part of the standard.
Early Rockwell chipset V.34 modems did not support asymmetric connects -- it 
is an optional part of the standard.  Take a look at bit 50 in the modulation 
parameter sequences (either MP0 or MP1) which is set to 1 to indicate a modem 
capable of asymmetric data rates.
Regards,
       David
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