Re: PCI WiFi causes USB Isoch packet loss!?

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

Hi Mr. Grigoriev!

Thank you for you reply!
It doesn't seem to be an EMI problem, because:
1. It comes always on one minute boundaries
2. It does not relate to communication intensivity/content on WiFi (leave it
alone for 15 hrs and you get the same results as when you use WiFi heavily)

Please see my answer to Mr. Shatskih for the rest of my reasons and doubts.

I hope that some WiFi specialist is reading this thread. ;)
I would like to find out something like: Set this or that to "off" or
"1000000 minutes" instead of "2 minutes".

Regards,
Greg1X

"Alexander Grigoriev" <alegr@xxxxxxxxxxxxx> wrote in message
news:ODtbGcmgIHA.1996@xxxxxxxxxxxxxxxxxxxxxxx
I suspect EMI is causing USB error.

"greg1x" <greg1x@xxxxxxxxx> wrote in message
news:dc2db$47d3a695$5062c1fc$15972@xxxxxxxxxxxxxxxxx
Hi!

I have a good working isoch streaming driver (full speed USB, queuing up
irp/urb pairs, etc...).
I usually run 12-15hrs long tests to see if any packet loss occurs. (XP
sp2)
If my PCI wireless card is disabled in device manager, or at least the
WiFi connection is disabled in network settings, the test completes
without any package loss.
If the wireless card and the wireless network connection are both enabled
(so the connection is alive), isoch packet loss occurs every two minues
(exactly 120 seconds). Sometimes every minute (exactly 60 seconds).
The packet's fail status is usually 0xC0000A00 (bad startframe) or
0xC000000F.
It means that the wireless connection (even if I don't use it at all)
interrups my USB stream every 60 or 120 secs (exactly).
When I replace the wireless card (US Robotics) with another one
(Linksys), the packet loss occurs every 10 minutes. (exactly 600 seconds)

Can anyone explain what is going on and how to avoid this?
Can I recommend any wireless or registry setting to my driver's users to
avoid wifi interruption without disabling their wifi connection?

Thanks for your attention,
Greg1X





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