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From: lenny@icus.islp.ny.us (Lenny Tropiano)
Newsgroups: comp.sys.att,comp.dcom.modems,biz.comp.telebit
Subject: Trailblazer and comatose mode [was Re: No reset??]
Message-ID: <494@icus.islp.ny.us>
Date: 17 Sep 88 04:04:17 GMT
References: <822@mccc.UUCP>
Reply-To: lenny@icus.islp.ny.us (Lenny Tropiano)
Distribution: na
Organization: ICUS Software Systems, Islip, New York
Lines: 37

In article <822@mccc.UUCP> pjh@mccc.UUCP (Pete Holsberg) writes:
|>
|>I have a Trailblazer on a 3B2/400 running HDB uucp.  From time to time,
|>a caller will get "NO ANSWER" from the system.  I suspect that this is
|>somehow related to what happens when someone calls in and then hangs up
|>(rather than logging out).
|>
|>I'm not sure if either problem resides in the modem, the cabling, or the
|>I/O port, so I'm open to suggestions for experimentation.  (I have both
|>PORTS and EPORTS on the 3B2.  Do you think that hardware handshaking
|>between the 'blazer and an EPORT might help?)
|>

I don't know whether the Hardware Flow control will work, but this happens
as well on my AT&T 3B1.  I've heard the symptoms called the "comatose" mode
on the 'Blazer.  It's probably the only think that really bothers me
about the modem... all in all it's a fine machine.

What I've noticed is that it happens with calls terminate abnormally, 
either hung up or possibly some sort of long BREAK signal.  It might
also have to do with the XON/XOFF handshaking, the modem getting
a XOFF, and never getting the paired XON.  For some reason the modem
doesn't reset.  It will not accept commands, or for that matter incoming
calls.

My kludge is to kill the uugetty (which drops DTR, therefore resetting
the modem) every 1/2 hour.  I hope the BA4.01 ROMs fix this problem.
I hope the upgrade is free as well... since there are bugs in the ROMS.

-Lenny
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