Hi Matthew - > These techniques are not mutually exclusive, I usually want people to > use gain modification as the last step in trying to eliminate echo > (after balancing the hybrid and making sure you are using a good echo > canceller). > > In the case of running fxotune, your zapata.conf software gain levels > should not affect its operation. If you are using any of the hardware > gain settings (wctdm24xxp module parameters) you should normalize those > to 0 beforehand so that they do not interfere with the calibration process.
Thanks for your responses! I actually didn't realize there are hardware gain settings available for wctdm24xxp (is there any documentation on this? I can't seem to find any). I assume the hardware gains default to 0 if left unset? Just two more questions: 1) I think we were experiencing ECFO with an rxgain setting of +10db (after having balanced the hybrid using fxotune). I'm guessing this is because that rxgain value amplifies the echo a bit too much. I know this is a bit of a loaded question, but is there a certain range of values for rxgain/txgain that we should stay within in order to avoid exacerbating any echo issues? 2) Are rxgain/txgain values applied before or after hardware echo cancellation? Thanks, Noah _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
