Re: (PM) 56k modems retraining

Christer Olsson (cox@clavicula.mednet.gu.se)
Wed, 28 Jan 1998 19:03:44 +0100 (MET)

On Wed, 28 Jan 1998, Rick Davidson wrote:

> I have been seeing the same thing but it is always from cities/TWP's that
> are on the edge of civilization but not quite rural. I have one customer
> who connects at 46-50k every time (Zoom 56k) but the connection will
> eventually trickle down to 26.4 and then it just hangs up. I can sit on t=
he
> phone with him and watch the connection stutter, we see it stop then it
> barfs a bunch of data across then stops etc... until it finally hangs up.
> The client environment has been ruled out as the cause. The only fix that
> worked was to add 3-4 commas after the phone number which knocked him dow=
n
> to a consistent 33.6. Conversly, my urban 56k customers get 42-50k
> connections that remain very stable.
> So... you are not alone, I see the identical situation here.

We have similiar problems with some modems connecting at 50.000 bps, but=20
directly went down to slower speeds. The problem is that the connection=20
timeouts (Win95 has only 60 seconds as default) before the login is=20
completed.=20

Mostly, they begin with 50K, but drops to 44K (good line) or 34K=20
(bad line). Other modems usually gives 44-48K and I=B4ve never seen any=20
reliable 50K connection here. So I wonder why the modems thinks 50K is=20
possibly and renegotiates directly after the connection?

The two modems I met with this problem is E-tech Bullet E56RVP and=20
Puretek PT-3011. Both is Rockwellbased.=20

Other modems like Zoltrix, Telix, Zoom and Intertex works well.=20

Our modemserver is a PM3E1 with EuroISDN, two 10-port 56K cards.=20
=20
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