USB 2.0 cable

  iqs 13:06 04 Sep 2011


I was wondering how long can a USB 2.0 cable be until performance is affected??

I'm aware you can daisy chain 127 devices using powered hubs,but I would sooner use one cable and no hubs.


  onthelimit1 13:10 04 Sep 2011

Max recommended length is 5 mtrs.

  Fruit Bat /\0/\ 13:12 04 Sep 2011

In practice, the USB specification limits the length of a cable between full speed devices to 5 meters.

For a low speed device the limit is 3 meters (9 feet 10 inches).

When USB was designed, a decision was made to handle the propagation of electromagnetic fields on USB data lines in a way that limited the maximum length of a USB cable to something in the range of 4m. This method has a number of advantages and, since USB is intended for a desktop environment, the range limitations were deemed acceptable. If you're familiar with transmission line theory and want more detail on this topic, take a look at the USB signals section of the developers FAQ

How far away from a PC can I put a USB device?

With the maximum of 5 hubs connected with 5m cables and a 5m cable going to your full speed device, this will give you 30m of cable (see section 7.1.19 for details). With a low speed device, you will be able to get a range up to 27m, depending on how long the device's cable is. With a straightforward cable route, you will probably be able to reach out 25m or so from the PC.

  iqs 17:04 04 Sep 2011

Thanks onthelimit1 ,and thanks again Fruit Bat /\0/\

Will go looking for A 5m cable tomorrow


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