92
rAtE VS. rEtrAIN
When incoming or outgoing POTS calls are active, the
Remote Connections
menu changes slightly. You will see two
additional buttons appear;
POTS Retrain and POTS Rate Drop
. These are special functions applicable only to POTS calls,
so they are not visible during IP connections.
These controls are similar in function to those provided on POTS codecs. NX will initially connect at the best data rate
supported by the telephone line, and will display that connect rate on the
Remote Connections
menu
.
This value may be
viewed by pressing the + next to the active connection. You can force the system to drop to the next lowest connect rate
by clicking the
Rate Drop
button at any time. Audio transfer will be interrupted momentarily while the units negotiate
the new connect rate. Alternately, you can force the system to initiate the entire training sequence again (the “chat”
sounds heard at the beginning of a call) by clicking the
POTS Retrain
button. You will lose audio for a longer time (approx.
7 seconds) but the modems will completely re-equalize the connection and audio will begin again once the retraining is
finished.
Once NX has dropped to a lower rate, either by a rate drop or retrain command from either end, there is no way to force
it to connect at a higher rate. If you want NX to try again for a higher connect rate, you will need to disconnect the call
and dial again.
