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I have a USB 1.1 keyboard and a USB 2.0 flash drive. Will the keyboard slow down other USB 2.0 devices connected to a USB 2.0 hub to 1.1 speeds?

Assume that the computer port for the hub is also USB 2.0. I understand that the hub will share the existing bandwidth and not multiply it.

My question is very similar to this but I'm interested in 2.0 and 1.1. Does a USB 2.0 device connected to a USB 3.0 hub slow down the hub to 2.0 speeds?

I ask because a quick google produced this but it is quite old. If things are as described here, is the situation any better with a USB 3.0 hub and 1.1 and 2.0 devices?

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pedro_sland
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2 Answers2

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Assuming you have a fairly standard 2.0 hub, it will not slow down, the USB 1.1 peripherals will run at 1.1 speeds, and 2.0 peripherals will run at 2.0 speeds, assuming the hub is connected to a USB 2.0 port.

Same hold for USB 3.0, mixing USB devices (1.1/2.0/3.0) on a hub will not slow down the overall connection or a specific device provided the hub is doing it's job correctly.

acejavelin
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You can determine the speed a USB bus is running at by

Windows

As explained in this answer by Synetech you can use the USBView tool from Microsoft that comes on the installation CD or as part of the Microsoft Debugger Tools.

Mac OS X

For the Mac you'll use the use System Information or System Profiler and select USB from the left column as explained in this support article from Apple

Linux

On Linux you'll need to execute lsusb -v as explained in this answer from maxschlepzig over at Unix.se

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Matt
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