USB Drivers -- A curious error message.

Since the problem seems to be associated with whether or not a phone is
plugged into a particular microfilter, I suspect the microfilter is a
bit dodgy, but the actual error message from the USB driver seems
misleading.

Not enough USB bandwidth.

It's a bijou Sagem F@st boxette, using USB. Once the phone was
disconnected, everything works, and there are other phones on another
filter, with no problems.

The error message is no help at all.


--
David G. Bell -- SF Fan, Filker, and Punslinger.

"I am Number Two," said Penfold. "You are Number Six."

"David G. Bell" <(E-Mail Removed)> wrote:
> Since the problem seems to be associated with whether or not a phone is
> plugged into a particular microfilter, I suspect the microfilter is a
> bit dodgy, but the actual error message from the USB driver seems
> misleading.
>
> Not enough USB bandwidth.
>
> It's a bijou Sagem F@st boxette, using USB. Once the phone was
> disconnected, everything works, and there are other phones on another
> filter, with no problems.

USB bandwidth is 12Mbits or so.
It requires each device to set in advance how much bandwidth it's going
to use, as it's a time-switched bus.
Unplug everything but the device in question from the USB port.

On 05 Jul, in article
<42cb0b4d$0$6269$(E-Mail Removed)>
(E-Mail Removed) "Ian Stirling" wrote:

> "David G. Bell" <(E-Mail Removed)> wrote:
> > Since the problem seems to be associated with whether or not a phone is
> > plugged into a particular microfilter, I suspect the microfilter is a
> > bit dodgy, but the actual error message from the USB driver seems
> > misleading.
> >
> > Not enough USB bandwidth.
> >
> > It's a bijou Sagem F@st boxette, using USB. Once the phone was
> > disconnected, everything works, and there are other phones on another
> > filter, with no problems.
>
> USB bandwidth is 12Mbits or so.
> It requires each device to set in advance how much bandwidth it's going
> to use, as it's a time-switched bus.
> Unplug everything but the device in question from the USB port.

Understood, but nothing I did on the USB side made any difference.
Disconnecting one phone, and no problem. I wonder if initialisation
generates a huge amount of USB traffic, but it's still a useless error
message.

I'll be getting another microfilter today.

--
David G. Bell -- SF Fan, Filker, and Punslinger.

"I am Number Two," said Penfold. "You are Number Six."

Hi,

Are you using Windows XP Gold (e.g. no service packs installed) ?

If so then there is an undocumented bug with some USB implimentations which
causes issues when devices switch from bulk to isochronos transfers which
cause USB devices to fail.

The solution is to upgrade to XP SP1 (or SP2).

Kind Regards

Simon

On Friday, in article
<42cec425$0$22114$(E-Mail Removed)>
postmaster@127.0.0.1 "Simon Zerafa" wrote:

> Hi,
>
> Are you using Windows XP Gold (e.g. no service packs installed) ?
>
> If so then there is an undocumented bug with some USB implimentations which
> causes issues when devices switch from bulk to isochronos transfers which
> cause USB devices to fail.
>
> The solution is to upgrade to XP SP1 (or SP2).

Using XP SP2.

It seems that the microfilters supplied were not quite good enough, as a
replacement stopped the problem happening.

--
David G. Bell -- SF Fan, Filker, and Punslinger.

"I am Number Two," said Penfold. "You are Number Six."

On Wednesday, in article
<(E-Mail Removed)>
(E-Mail Removed) "David G. Bell" wrote:

> On Tuesday, in article
> <(E-Mail Removed)>
> (E-Mail Removed) "David G. Bell" wrote:
>
> > Since the problem seems to be associated with whether or not a phone is
> > plugged into a particular microfilter, I suspect the microfilter is a
> > bit dodgy, but the actual error message from the USB driver seems
> > misleading.
> >
> > Not enough USB bandwidth.
> >
> > It's a bijou Sagem F@st boxette, using USB. Once the phone was
> > disconnected, everything works, and there are other phones on another
> > filter, with no problems.
> >
> > The error message is no help at all.
>
> OK, both the microfilters work fine at the master socket, where the ADSL
> modem and one phone are connected.
>
> Neither works at any of the extension sockets, wuth various phones
> connected, but I haven't checked if ADSL will work from an extension
> socket.
>
> I reckon this rules out the problem as being a particular phone or
> microfilter, but may indicate a fault in the extension wiring.
>
> Might a filter built into the master socket, keeping ADSL frequencies
> away from the potential fault, solve the problem?
>
> And what sort of extension wiring fault might only show when a phone is
> connected?

Buying another microfilter seems to have got things into a workable
state.

In the process, I found that the local DIY shop (a local business)
stocked microfilter faceplates for the standard extension sockets, not
something I recall seeing in the big DIY warehouse places.

--
David G. Bell -- SF Fan, Filker, and Punslinger.

"I am Number Two," said Penfold. "You are Number Six."