CH> > And if you Put a %E2 in the String the modem will Change up and Down
 CH> > for the line Quilty so always getting best speed for that line ;)

 CH> That will only work if the _other_ end also sets %E2.

No, that's not so.  The modem with %E1 set will still respond to rate
change (up) requests - it just won't initiate them itself.

We've demonstrated this well here between a 144FM and a Dataplex DPX596,
the latter having finer control over retrain conditions and timeouts.  The
Maestro uses %E1, leaving the rate shifting initiation to the DPX596.  This
is no longer an issue after exchange upgrades around here, but sure was
before ..

 CH> Most BBS's, ISP's etc would most likely set %E1 because it's the
 CH> most reliable. It is also NOT
 CH> recommended on a noisy line, because the modem will spend
 CH> more time retraining in order to grab the "best" line it
 CH> can as conditions dynamicly vary, than it does shifting
 CH> data. With a 15 second "dead" time for each retrain, comms
 CH> becomes a joke with %E2 on a noisy line....that's why
 CH> sysops set %E1.

That was (partly) true with the older, buggier chipsets, like those in the
14400 Maestros.  I say 'partly' because rate change requests are not
retrains, and take only several hundred milliseconds, as opposed to the
many seconds of a retrain.  I'm sure the latest ones wouldn't 'hunt' nearly
as readily as the older ones - which were pretty 'trigger happy' for sure.

Ian

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