Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

A ridiculous question about a ridiculous problem.

I have a USB wifi device and when i plug it in 2 of the USB slots in the back it is ridiculous slow. It goes <10k a second, usually 1k. When i put it in the other 2 slots it can get up to 200k. When i put it on my USB hub (which is connected in the front) i get my full speed. What gives? Is there something wrong with the usb device? How do i test it?

I did grab the latest driver from the manufacture website.

share|improve this question
    
Where is the hub relative to sources of radio interference? Where do you place this Wifi device when connected to the hub? Try using a USB extension cable and place the Wifi device at the same spot as if using the hub. Your Wifi device is a radio transmitter+receiver with an antenna. Its location is crucial for proper operation/performance. – sawdust Apr 7 '12 at 9:17
    
@sawdust I tried plugging it on all ports (several in the back, two in front). I'll try physically holding the extender by the ports i plug it into and see what happens. I doubt anything woukd – acidzombie24 Apr 7 '12 at 10:49
    
It sounds like 2 of the ports are not USB 2.0 – Ramhound Apr 11 '12 at 15:34
    
@Ramhound incorrect. Related superuser.com/questions/411027/… – acidzombie24 Apr 12 '12 at 5:47

Someone has connected a USB 1.1 case/card extender to one of the motherboard's USB 2.0 connectors. That's not a supported configuration. Cables and extenders cannot negotiate, and so they must support the highest mode supported by both ends of the things they connect. You cannot connect a USB 2.0 device to a USB 2.0 controller through a USB 1.1 cable or extender. (You can through a USB 1.1 hub, because a hub becomes the device at both ends.)

You should either not use the ports on the extender or replace the extender with a USB 2.0 extender such as this one, this one or this one.

share|improve this answer
    
Actually, its messed up so much you either misread or misunderstood. All the ports except the 2 i didnt test on are USB 2.0. The other 2 are USB3 ;). The extender is 2.0 as well but why it doesnt work directly connected baffles me. – acidzombie24 Apr 7 '12 at 8:28
    
The extender is the problem. It appears to be 2.0 because it's connected to a 2.0/3.0 port. But it doesn't actually support 2.0 speeds. It can't negotiate a lower speed because it's not a device, it's just wires/connectors. – David Schwartz Apr 7 '12 at 8:30
    
No no no. I mean. IT WORKS on the extender. IT DOES NOT WORK ON THE TOWER. I'll repeat again. I can get expected speeds with the extender but NOT on the tower (which gives me 10k or 1k) – acidzombie24 Apr 7 '12 at 10:41
    
What does "on the tower" mean? Does it mean a USB port on your case that is connected to an extender that connects to the motherboard? If so -- that extender is the problem. – David Schwartz Apr 7 '12 at 10:42
    
Using the wifi usb on ports built onto the tower/computer. This happens even on the port the extender is plugged into – acidzombie24 Apr 7 '12 at 10:44

Two ideas:

Power - is the hub bus powered or self powered? If it's self powered it may be supplying more power to the wifi adapter than your pc does.

Antena - the USB cable between the pc and hub may be acting as an antenna. Try using just a USB extension cable instead of the hub.

share|improve this answer
    
related superuser.com/questions/411027/… – acidzombie24 Apr 12 '12 at 5:50

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .