Meng-Shi, at 00:16 on May 30 1996, you wrote to Bill Grimsley...

BG> Some Rockwell chipsets have poor implementations of both V.42 and the 3429 
BG> symbol rate, and are both fixable in firmware.  For example, I quite often 
BG> see 28800/NONE connects when calling one particular Rockwell with my 
BG> Courier, but disabling the V.42 detect phase (and forcing LAPM) solves this 
BG> problem.  If calling Hayes Optimas, I have to disable the 3429 symbol rate 
BG> in order to connect at 28800 as well.

ML> Could you please explain to me what the 3429 symbol rate is? I can't
ML> find any reference of this in the mannual.

The term "Symbol Rate" can be likened to Baud (number of state
changes per second), which has been corrupted recently by complete cretins
who (wrongly) interchange Baud with bits-per-second.  The 3429 symbol rate
is the next (and final) step up from the 3200 symbol rate, and is necessary
for connecting at link rates in excess of 28800bps (i.e USR's 33600bps
V.34+).

ML> that lasted for hours but most times I get a 26400 LAP-M v42bis that would 
ML> drop off after minutes.

BG> Does the speed simply drop off, or do you actually lose carrier?  If the 
BG> latter, one of the modems has likely had its retraining ability disabled. 

ML> Lose carrier. I'll ask my ISP what their set up is.

Might be a good idea, as some Rockwells (Maestros in particular) actually
default to "retrains disabled", which is completely mad IMO.

ML> Thanks for the reply BTW.

My pleasure.

Regards, Bill
@EOT:

--- MsgedSQ/2 3.30