> On Monday, August 25, 1997 11:43 AM, Jordan Mendelson [SMTP:jordy@wserv.com]
> wrote:
> >
> > Well, I've noticed with a Zoom v1.002 (out of box), there are a high number
> of
> > modem retrains. We connect at 50K basically every time, but for some reason,
> > the Zoom wants to retrain all the time.
>
> Well, I'll just reply to my own message. The problem, as it turns out is that
> there are special characters in the file I was downloading (standard Linux core
> file), which cause the modem to retrain.
>
> Using the command:
>
> asyncmap 0x00000000
>
> Fixes basically everything. The file now downloads at 10.54 K/s, I have very
> few slowdowns whatsoever.
This is bogus. A all-zero async map means that no characters are
escaped, so everything is transmitted as-is. So, so all those
"special characters" are still being transmitted over the link. Besides
"special characters" aren't supposed to cause retrains, because the
connection should be 8-bit clean.
However, if your asyncmap contains a lot of bits, PPP will have to
escape a lot of characters, causing a lot of extra traffic to be
transmitted.
> I'm happy.
>
>
> Jordan
>
> --
> Jordan Mendelson : www.wserv.com/~jordy/
> Web Services, Inc. : www.wserv.com
>
>
>
Tom