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Running USB 3.0 extension next to AC line Answered

I have an HTPC hooked up to the entertainment center.  I have a 5ft rubber "wire-hider" that I'm running an extension cord to a coffee table with a hidden power strip so people can plug in their laptops, etc.

I bought a 5m/"15 ft" usb 3.0 extension cable and ran it next to the cord in the wire-hider, then connected usb 3.0 powered hub to the cable.  PC struggles to connect devices, and drops them intermittently. My 1st guess was EMI, so I unplug the extension and no problems.

My question, can anyone suggest a source for shielded USB 3.0 extension cable OR can I use Shielded Cat6 to run USB 3.0 signals?  Besides wireless or buying a second wire-hider, do you have any other suggestions?



4 years ago

If you can get shielding braid over the connectors ends, which isn't much of a problem with the itsybit connectors used for USB, you can make your own. it might look ugly, but it will function electrically as physics dictates. It's a tried and true method for achieving a close approximation to the performance of higher gade (mil, ind) shileded cabling

Having said that, although I don't have a part number for you, I'm sure a thorough check of the net will reveal a solution, though it may cost a pretty penny for an industrial or mil-grade product (which is where one usually finds the more robust cable solutions. They usually get priced at a premium

BTW, have you considered handling the source? If there is no radiator, there is no noise to receive.

If your AC extension cord is emitting that much hum, perhaps you might consider shielding it as well while you're at it. Double layer of protection.


4 years ago

Fifteen feet would be OK for USB 2 but apparently USB 3 needs shorter cables.

"Despite these improvements in electrical performance, USB 3.0 is
significantly limited by its shorter cable length requirement. In April
2013, an update to the USB-IF compliance for USB 3.0 standards
restricted A male to B male cable lengths to three meters maximum.
Cables with USB 3.0 Micro B plugs were limited to one meter maximum for
compliance requirement. Although these cable lengths are sufficient for
typical USB 3.0 connections use at home and/or office, there are many
applications in which longer USB 3.0 cables are required."

You need a powered hub to boost it another 10 feet.

it is also possible that you got a poor or defective cable. If the wire resistance is greater than it should be it could be killing your signal. A poor, cheap copper alloy could cause that kind of problem.


4 years ago

I have this umbilical chord running from my flat screen to my desk.

I holds a 120V AC cable, 2X HDMI Cables and a USB 2.0. I haven't had any problems.

What may be happening is the USB cable may be traveling too far without being amplified. In my case I had to buy a extension cable with a build in Repeater/Amplifier. Even then I still use a USB hub on the far end to boost the signal and add some extra Inputs.

I would sugest you do the same. Buy a USB 3.0 Hub and install it under your table :)


Answer 4 years ago

PS: If you really want to sheild your cable use copper tape or metalic ducting tape