USB hubs

  VCR97 20:12 12 Dec 2004
Locked

Why do the instructions for some USB2 equipments tell me not to connect via a hub, or to use only a hub which is approved by the equipment manufacturer? What's the difference between a primary port and a hub port?

  Diodorus Siculus 20:46 12 Dec 2004

It may refer to powered / unpowered hubs. Some peripherals will need their own power supply if they are plugged in to an unpowered hub.

  Diodorus Siculus 20:47 12 Dec 2004

USB.org - Frequently Asked Questions
click here

Try working through these... :-)

  howard60 20:47 12 Dec 2004

some hubs come with an external power supply and others pick up the power from the pc. If the device being plugged in needs a lot of power then it needs a powered hub.

  VCR97 19:10 13 Dec 2004

Thanks, both. The multi-function device and the scanner which had the comment in their instuctions have their own PSUs so they shouldn't be worried. I didn't find anything in the FAQs. I'll see if I can get any info from one of the suppliers.

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