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Thread: USB hubs make my hardware act flaky

  1. #1
    Raw Wave wizardPC's Avatar
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    USB hubs make my hardware act flaky

    So, I am building a carputer for someone and there are about 12,831 USB devices on it so I need a hub or two.

    Problem is, that some things don't seem to like being plugged into a hub. The Orinoco and the Deluo GPS in particular act flaky when plugged into a hub. The orinoco isnt recognized after reboot and must be unplugged and plugged back in to work. The Deluo acts like its working, but it won't lock (guys from the Atlanta meet, I think this is the reason I didnt get a lock on the way)

    I have tried 2 different hubs, thinking that maybe my first hub was defective but I get the same results. Both are USB2.0 4-port powered hubs.

    I was just kinda wondering if maybe the way hubs split the bandwidth is causing my problems. I don't really know how they work, so maybe if someone thoroughly explained it I could understand why I am having these problems

    BTW, the devices are:
    Deluo GPS
    Orinoco Silver
    Zippy El610
    XM-PCR
    Lilliput TS
    Video Capture cards (2)
    Slim DVD (externally powered)
    Probably forgetting something....
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  2. #2
    Raw Wave Defiler's Avatar
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    Are they plugged into a USB PCI card by any chance?

    Whenever I tried using one my stuff did the same thing on my home computer.
    Aura MR62 (F and R)
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  3. #3
    Raw Wave wizardPC's Avatar
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    nah, its an epia with the 2 ports on the backpanel and the 2 that you connect to the board.

    I fixed the GPS thingy I think. I disabled the ballpoint mouse that was listed in device manager.
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  4. #4
    Variable Bitrate
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    I think some USB devices will not work properly unless plugged directly into the computer.

    I believe my Linksys USB 802.11g adapter says that it won't work through a hub.

  5. #5
    FLAC
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    Wiz....how's the job search? Isn't graduating fun?
    The Orinoco and the Deluo GPS in particular act flaky when plugged into a hub. The orinoco isnt recognized after reboot and must be unplugged and plugged back in to work
    I had quite a bit of trouble with my new Orinoco until I downloaded the latest drivers from the Agere support site. Now it works fine behind a USB 2.0 hub, even with other devices connected to the same hub, even after hibernate and standby!
    MikeH

  6. #6
    Raw Wave rando's Avatar
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    I had problems with many USB devices running through hubs as well. I use a single USB connection from the M10k and chain that into two 4 port hubs (total of 7 ports free). I then have all 7 slots filled (Touchscreen, GPS, Radio, AudigyNX, iMic, Card Reader, USB->Serial). I power the hubs and the Audigy from an Opus 5V output. What I found was that the voltage on my 5v rail was dropping to around 4.2V. In aggregate, these devices were pulling 2.5A+. With a 12-15ft run of 18G wire, that works arout to rougly .2-.3 ohms @ 2.5A = .75V of drop!

    To solve this problem I ran a couple of extra strands of 18G. This brought the voltage back up to 4.8V. I haven't had any problems since then.

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