Long usb cables not recognized on my computer?

By ryan29121 ยท 6 replies
Jan 27, 2008
  1. I have two computers my new desktop computer and my older 2 year old computer. I have a printer connected to a 16ft extension cable and then connected to my computer. From my new computer it does work saying that the device is not recognized. When I plug it into my laptop it works perfectly. Is there anything I can do to make it work on my new computer? I installed the printer drivers on both. Thanks in advance for your help.
  2. LookinAround

    LookinAround Ex Tech Spotter Posts: 6,491   +184

    In practice, the USB specification limits the length of a cable between full speed devices to 5 meters (a little under 16 feet 5 inches). For a low speed device the limit is 3 meters (9 feet 10 inches).

    When you say it's an extension cable.., does that mean 16 ft extension PLUS some other cable length? An even if not, while 16' might meet spec i'd still try a shorter cable since it's approaching the limit.
  3. grimesy69

    grimesy69 TS Rookie Posts: 52

    are you trying the front panel usb ports on the workstation? If so try the rear ports.

    As lookinaround stated with maximum lengths etc, i suspect its to do with power not being sufficient over the cable.

  4. ryan29121

    ryan29121 TS Booster Topic Starter Posts: 174

    The 16ft extension is connected to another 6ft usb cable. I might agree with the fact that the cable is too long but I tried it on my laptop (same cable and same device) and it worked fine. Also I am using the back panel ports on my computer.
  5. LookinAround

    LookinAround Ex Tech Spotter Posts: 6,491   +184

    If you exceeded the limit, it doesn't mean it can't work but it does mean it either won't work or won't work reliability. In this case, getting different results tyring two different devices is not unusual.
  6. grimesy69

    grimesy69 TS Rookie Posts: 52

    a powered USB hub could work, but it wouldn't be worth wasting the money if it didn't.

    Apart from that, there isn't much that can be suggested apart from moving your printer closer :D

  7. jobeard

    jobeard TS Ambassador Posts: 11,166   +986

    have you tried attaching with a short cable to one system and then using
    File/Print sharing?
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