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echo: aust_modem
to: Meng-Shi Lim
from: Angus Tong
date: 1996-07-12 14:12:54
subject: Fallback limits

Hello Meng-Shi.

05 Jul 96 20:08, Meng-Shi Lim wrote to Danny Keogh:

 ML> 1) If you let the modem negotiate the connection as per factory
 ML> setting, you don't see fall forward much. For example, the modem
 ML> starts negotiating from 28.8k and if the quality of the line isn't all
 ML> that good connects at 21600. I don't think the modem can fall forward
 ML> beyond 21600. I think the reason is that during the initial
 ML> negotiation, the v34 has already determined the noise tolerance range
 ML> of the line and set a limit. However,

I beg to differ... My lines are old but can handle 33600 easily... However
sometimes I leave call waiting on, the modem does retrain to lower speeds
and just waits till call waiting buggers off and falls forwards/speed
shifts back up to either 28800 or 33600..


Angus

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