Non-Error Control Mode

Automatic rate re-negotiation is based on signal quality when the modem is using a constant DTE speed and not providing error correction. That is, when the &Q6 command is selected or &Q4 is selected with the BSC mode. Rate changes may be attempted according to the following:

1  If the signal quality falls below the limit set by S108, first try a retrain. If the signal quality    

   stays below the limit, attempt the next lower speed if that speed is allowed by S109.                   

                                                                                                          

2  Attempt to shift to higher speed if the signal quality indicates the attempt will be successful and    

   sufficient time has elapsed since reaching the current speed (60 s is recommended).

Note: Sometimes a rate re-negotiation attempt will not produce a different speed because the speeds the distant modem have enabled match the local modem speeds only at the current speed.

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