linux - USB Hub Error -62

11
2013-08
  • arminb

    I have a 5m usb cable which I want to connect to a usb port on a embedded device (linux debarm; kernel 2.6). The cable has one repeater so it's actually two cables with one hub between. When I plug it in dmesg shows me:

    usb 1-1: new full speed USB device using at91_ohci and address 23
hub 1-1:1.0: USB hub found
hub 1-1:1.0: 4 ports detected
usb 1-1.4: new full speed USB device using at91_ohci and address 24
usb 1-1.4: device descriptor read/all, error -62
usb 1-1.4: new full speed USB device using at91_ohci and address 25
hub 1-1.4:1.0: USB hub found
hub 1-1.4:1.0: 4 ports detected
hub 1-1.4:1.0: hub_hub_status failed (err = -62)
hub 1-1.4:1.0: config failed, can't get hub status (err -62)

    Strange: When I plug in an ordinary usb hub and into this hub I plug in the 5m cable it gets recognized and works properly.

    Does anyone have an idea what could cause this error?

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  • Matthew Robertson

    How capable are USB hubs?

    I have an AirPort Extreme router with a printer attached (it's not powered by USB). I want to extend this and add two hard drives (one for Time Machine and the other for EyeTV recordings).

    Can a 4-port USB hub (I'm considering this one) achieve USB 2.0 speeds and power the hard drives? What difference would a self-powered vs externally-powered hub produce?


    • Related Answers
  • Radruler

    Ive run 3 external hds off a Belkin wall-powered hub and gotten the same speed as a direct connection, however my hard drives were all wall-powered as well. As a rule of thumb, it's definitely better to get powered USB hubs for any hard disk usage or heavy data access (bigger thumb drives, etc), while self/computer powered hubs are usually for mouse/keyboard and generally device inputs. There is no downside as far as I am aware of using a wall-powered hub, so if you have the extra cash, its always a good investment to go with external power. I personally use an old model of Belkin's hubs, and its served me well for almost 3 years now.

    tl;dr: Drawing usb power is bad for lots of data transfer, grab an externally/wall powered hub and you should be fine. Try and get the hard drives themselves powered too -- the less stress on the hub, the better.

  • Stefan Thyberg

    A self-powered USB Hub typically reinforces and repeats the signal so that you may have longer cables. It's definitely to be prefered when running heavy USB appliances such as harddrives.