Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!lll-winken!uunet!ficc!kunkee
From: kunkee@ficc.uu.net (randy kunkee XNX MGR)
Newsgroups: comp.dcom.modems
Subject: Re: Telebit answers international calling questions! (Part 1)
Summary: I've been experimenting with those...
Message-ID: <3543@ficc.uu.net>
Date: 24 Mar 89 04:38:41 GMT
References: <4377@drivax.DRI> <1445@altger.UUCP> <12374@microsoft.UUCP>
	<559@octopus.UUCP>
Organization: Unix/Xenix Support Group
Lines: 41

| 
| 1) No need to go back to rev 3.0. The new 'micropackets' in the 4.0 ROMs
|     can cause havoc on low quality connections. Setting S120=12 disables
|     micropackets...
|     but should make things happier for file transfers.
| ...
|     a LOT, and eventually give up. To solve this, use the J6S36 register
|     (that is NOT a typo: it is a hidden debug register...). The default
|     value is 0. As you increase the value to 1,2, or 3, you cause an
|     increasing period of "guard tone" to be inserted before each packet
| ...
| 3) If S120 is non-zero, it will show up in your ATN?. J6S36 will never show
|     up.
| ...
| 
| b) Must these parameters be used at both ends of the line?
| 

No, not according to my conversations with Telebit.  Set one end and the
other follows suit.  This makes a lot of sense.  Just 'cause you can't
do micropackets across a satellite is no reason to have to disable them for
local phonecalls too.

...

| 
| d) Why not auto-increase the J6S36 value if there is trouble?

Sounds like a great idea to me.

I've been playing with those registers too.  No breakthroughs yet.
My main point here when I call Telebit they are courteous and
helpful.  However, their backlog is usually a day or two to return
your phone call.  I don't think I'd suggest holding.  By the way,
I asked and they are probably going to come out and document those
mystery registers.
-- 
Randy Kunkee
Ferranti International Controls Corporation
12808 W. Airport Blvd.  Sugar Land, TX 77478
UUCP: uunet!ficc!kunkee       ph: (713) 274-5132