Intermittant modem failure? (fwd)

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On Sat, 11 Oct 1997, Gert Doering wrote:

> > This is happening with Digicom rack modems (DSI MultiAccess Communications
> > System) which are supposed to be "industrial" type modems rather than
> > consumer grade.
> 
> Should be OK then.

Should be...though we've been having a lot of trouble with Digicom ports
locking up permenantly (requiring manual reset) after or during sessions. 
At that point they make really weird sounds (if I tap into the line with a
telco test set) almost as if they got stuck in some sort of retrain. They
keep coming out with hardware and firmware patches trying to fix that.

> This could be a problem of two DTR drops in quick succession. Please try
> setting "toggle-dtr no" in mgetty.config, and check whether it goes away.

I tried that a few days ago. The Digicoms seemed happy with it, but the
USR MP's were not. I think the problem there was the USR's are doing a
reset on DTR drop after each session, and that reset seems to take a lot
longer than the reset on DTR drop that should happen when mgetty does
it...so mgetty sends the init string early and the MP modems miss it.


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