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From: gandrews@netcom.COM (Greg Andrews)
Newsgroups: comp.dcom.modems
Subject: Re: V.32 problems: modems not talking
Summary: Hmmm...
Keywords: PPI 9600SA vs. USR Dual Std. vs. T1600
Message-ID: <1991May1.000254.10956@netcom.COM>
Date: 1 May 91 00:02:54 GMT
References: <665@mixcom.COM>
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In article <665@mixcom.COM> xeee02@mixcom.COM (Dean A. Roth) writes:
>
>The 9600SA and T1600 will not make a V.42 or V.42bis
>connection, but will make a MNP 5 connection.  Both
>will make a V.42bis connection with other modems - just
>not each other.
>

I helped someone troubleshoot a connection where a PM9600SA was calling
a T1600 (ditto for an Intel 9600EX).  We needed to set the PM9600SA
to negotiate V.42/V.42bis ONLY, without allowing fallback to MNP.
Then they were able to link up.  When the T1600 called the PM9600SA,
they liked up with V.42/V.42bis without any special settings needed.

I concluded that something is different about the way the two modems
request V.42, but I couldn't tell exactly what that difference was.

>
>If I use the T1600 to call the USR, or vice versa, I get
>a V.42bis connection.  Eventually, though, one of the modems
>locks (nothing comes or goes).  This behavior has only 
>been observed between these two modems.
>

I use a T1600 to talk with Compuserve's USR DS modems almost every
day.  I haven't noticed any unusual freezeups or disconnections so far...

>Dean Roth           deanr@mixcom.com

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