What is the max length of an usb cable?


Moderator emeritus
Jan 9, 2004
Grand Rapids, MI, USA
As the title says, What is the max length of an usb cable?
Video quality degradation isn't the issue -- it's a digital transmission, not an analog transmission, is it not?

Per spec, I believe what Wikipedia says:

The maximum length of a standard USB cable (for USB 2.0 or earlier) is 5.0 metres (16.4 ft).

Is correct. Latency, as they note, and possibly also impedance for the 5V power component of the signal, are the issues, though, not signal degradation.


macrumors 65816
Feb 26, 2008
Be careful. When I tried to hook up my EyeTV Hybrid with a random 2 foot USB cable, the video showed up as green blocks and the audio was still there. I suspect the cable isn't up to the USB 2.0 spec.

That doesn't mean you should spend a lot of money on a cable, though. You can't go wrong with Monoprice.com

It is best to use just one cable if you can, rather than an extension cable plus another cable.
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