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echo: aust_modem
to: Angus Tong
from: Dave Hatch
date: 1996-07-26 22:29:59
subject: problems

BG>> US/Canada EPROM code, with their higher than legal -10db TX levels
BG>> (and the fact that they also suffer from the Sportster's V.42bis
BG>> problem tells me that the code is identical).

AT> Higher as in -11 or as in -9?? I've seen a few reposts of connection stats 
AT> with -15db TX levels..

The sign is "-".  The bigger the number, the lower the level.

The legit max level is -10dbm.  Using a S12 linecard, the actual optimal
point is only about 1 db wide, and urgently needs to have the transmit
level tuned to that point.  Of course, we're forbidden to adjust the level
- and manufacturer spread is about 6dbm, 3 plus and minus of the nominal.  

US modems can adjust up to -9, which doesn't work at all well.  Depending
on your copper length, somewhere between -10 and -12 is optimal.  Too high
a level produces clipping distortion, and wrecks the link well and truly.

Regards,
Dave Hatch.

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