Discussion
USB Bandwidth errors have started showing up now when I try and use too many USB devices along with the USB Modem. Tried using my webcam to test this further and seems I can't even use the webcam whilst the modem is plugged in!
Web on, no cam.
Cam on, no web.
Any way round this other than just buying another PCI USB2.0 card?
(There is some system reserved bandwidth, what is that for, if that can be removed it would (should) be ok..)
Dave.
Web on, no cam.
Cam on, no web.
Any way round this other than just buying another PCI USB2.0 card?
(There is some system reserved bandwidth, what is that for, if that can be removed it would (should) be ok..)
Dave.
roadsweeper said:
The cam wants to take about 70% bandwidth!
70% of USB2.0 bandwidth is a hell of a lot surely?! Are you sure you're not running a USB1.1 motherboard or hub?
Nope! USB2
I've just ordered a new PCI USB 2.0 card from eBay so that should solve it. I could do with a few more ports anyway...
Dave.
Good luck with it, it certainly sounds like something is wrong rather than it just being a case of, "That's how it is!" if you know what I mean? I have comfortably run two 300GB USB2.0 HDDs on my system along with a 40GB USB2.0 HDD, USB keyboard and mouse, iPOD, external DVD writer and phone cradle without any problems. I'm using a Dell laptop with a port replicator, Belkin 7-port USB2.0 hub and a Dell monitor with 3 additional USB connections so I can't see how you're having a problem without something being faulty.
Possibly a 1.1/1.0 USB camera and your hub is a cheapy one that can't handle having all those 2.0 devices plugged in and the 1.0 at the sametime; gets horribly confused and drops the bandwidth.
I remeber something appearing on Tom's Hardware a while ago about the various issues surrounding USB hubs and AFIK TTS units in them.
The new PCI card should sort the problem though
I remeber something appearing on Tom's Hardware a while ago about the various issues surrounding USB hubs and AFIK TTS units in them.
The new PCI card should sort the problem though
Yep, I would have thought the USBs on the Mobo wouldn't be the problem though... Quite a decent board, unlike my old one 
As I say I was in need of a new PCI USB card anyway, this just gives me a better excuse to buy one
- Might get a newer USB2 webcam from eBay too.. along with digital camera, the fact that it needs sellotape on it to function is getting annoying
Thanks for the advice/info.
Dave.
As I say I was in need of a new PCI USB card anyway, this just gives me a better excuse to buy one
- Might get a newer USB2 webcam from eBay too.. along with digital camera, the fact that it needs sellotape on it to function is getting annoying Thanks for the advice/info.
Dave.
so the card is 'hanging loose' for a while. Back to eBay again for me!
scorp said:
Cameras use something called isochronous transfer which means has top priority to the bandwidth of the bus to gaurantee low latency, 70% of 480mbps sounds somewhat high for a camera though, have you tried lowering its capture resolution?
It'll do me fine for now, as long as it's working OK on the new card, I am fine until I buy a new camera
The other real problem is that USB doesn't handle changes in the direction of data well so if you have a constant input device e.g. the camera and then a constant output device e.g. printer and both are on the same port then to handle the data flow the bus is constantly having to switch directions which kills the bandwidth.
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