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echo: aust_modem
to: Michael Raiteri
from: Bill Grimsley
date: 1995-08-20 06:56:18
subject: DYnalinks V34+ modems

Michael, at 15:24 on Aug 17 1996, you wrote to Bill Grimsley...

BG> It could just as easily be the remote modem at fault.

MR> The thought had crossed my mind however I would have thought my ISP would 
MR> have had more than one modem and its my ISP that just refuses to negotiate 
MR> at anything other than a set 14400. 

Is that 14400/V34 or 14400/V32 though?  It is not inconceivable that your
ISP is running a bank of say 14k4s on one rotary number, and a bank of
28k8s on another line, although I'd still be very surprised if that was the
case.

MB> I wish they would reply to my email as to what types of modems they are 
MR> using.

No good pointing the finger until you find out for sure, either.

BG> Sure, but I've already told you to try disabling the 3429 symbol rate and 
BG> the V.42 detect phase, both of which are workarounds for problems inherent 
BG> in others modems, not necessarily yours.

MR> I've also tried that S33=32 to disable the 3429 symbol rate as well as both
MR> S15=128 to disable V42 and S15=136 as mentioned by Tom Przeor.  It didn't 
MR> make any difference.

If you're seeing /ARQ connects, and not being tossed off, neither of the
above will make any difference in your case anyway.

MR> Again thanks.  It had Dynalink totally stumped.  None of their tech team 
MR> had ever heard of it.  Pretty bloody poor on their part.  Maybe you should 
MR> get a job there to improve things a _lot_.

No thanks, I'm pretty choosy about where I work.  :)

BG> Sounds to me like the original connect was made without error correction, 
BG> something which disabling the V.42 detect phase is supposed to prevent.

MR> Hmmm &m4 would allow that as well. I've since changed to &M5. 

Probably not a bad idea, as your modem will then drop carrier if an /ARQ
connect is not negotiated.

MR> lastly could you confirm that S15=128 does disable V42 detect phase and not
MR> disable V42 entirely.

Tom says that S15=136 is required for that, and as I don't have a Dynalink
to test, I can't confirm it either way.  I'd take his word for it though.

MR> The modem online help for the S registers has S15=128 - disable V42

And S15=8 disables MNP handshake, does it not?  Sounds like both commands
are required to force a non-negotiated LAPM connect then (ask Tom).

Regards, Bill
@EOT:

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