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Thread: USB1.1 and 2.0 incompatibility

  1. #1
    Constant Bitrate
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    Nov 2005
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    Missouri
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    USB1.1 and 2.0 incompatibility

    I understand that it is possible (although not always the case), that pugugging a USB1.1 device into a hub along with 2.0 devices may cause all the devices to run at 1.1 speed.

    To resolve this problem I plan on running 2 USB hubs up front.

    My question though is how far down the chain does this problem persist.

    Senario 1. I run a single usb2.0 hub from the PC to the front. I then connect two more USB hubs to the 1st hub, 1 running 1.1 devices the other 2.0 devices. Does the problem persist back through the central hub (I.e. this doesnt solve the problem).

    Senario 2. I run two hubs from the PC to the front. Does this solve the problem.

    I'd rather just run the one cable as in scenario 1 even though it requires an additional hub.

    Kicker... At the moment I am using an older Dell laptop (this will change but I'd like all the cabling to remain the same) This laptop does not have USB2.0 ports, instead I am running a PCMCIA card with 4 USB 2.0 ports. Could the problem persist all the way back to the PCMCIA card? Meaning that running any 1.1 devices will slow everything down?
    (Even here scenario 2 would work as I could run the 1.1 devices off a hub connected to the laptops native 1.1 port.

    Thanks...Paul

  2. #2
    Maximum Bitrate DeltaFX's Avatar
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    Sep 2004
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    France
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    Split 2.0 & 1.1 immediately.

    Mobo -> Hub 1.1 -> 1.1 peripherals
    Mobo -> Hub 2.0 -> 2.0 peripherals.
    Now Galileo is real. Muhahahahaha :p

  3. #3
    MySQL Error Scouse Monkey's Avatar
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    aye. safest way

    also spit high usb2 usage items. ed DVd drive and HDD.

  4. #4
    MySQL Error Scouse Monkey's Avatar
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    some hubs allow you to run 1.1 and 2.0 at full speed without problems but most dont and they dont tent to advertise this feature.

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