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How many USB devices can I attach to a single machine? How many USB devices can I attach to a single machine?
The limit to the number of units you can attach to a single USB controller is limited by two general governing rules, which are affected by the type of devices you are attaching and a tiering rule of USB. They are:
You can not have more than 7 tiers of devices on a single USB bus. In other words, 6 "cable hops" (hub layers) in any one direction.
You can not have any more than 127 devices on any one USB bus. Further, UNLIKE with networking, hubs are NOT transparent. They count as devices.
There's a term in USB, which is "compound device". This basically means it is one physical box, but is more than one USB device internally. The AccelePort USB 8 is such a device. It is one box, but counts as TWO USB devices. There is the multiport serial device, and the internal hub, as well. This matters if you are looking at the maximum number of devices you can hook up to your system.
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