SHIELDED USB3 short M:F ext cord - where?

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consorts
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Joined: 13 Sep 2017
Posts: 88

PostPosted: Sat Aug 25, 2018 18:54    Post subject: SHIELDED USB3 short M:F ext cord - where? Reply with quote
i have a usb3 ssd plugged into my usb3 router port
usb3 interferes with 2.4ghz wifi signals (lowers SNR)
i tried a patch cord to locate the ssd away from the router
https://www.ebay.com/itm//141848065288
but while it's transfer rate is great, it's not shielded
so the noise while in use steps all over the 2.4ghz wifi.
so where i can find an affordable usb3 m:f cord
that is truly shielded
without diy making my own?
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consorts
DD-WRT User


Joined: 13 Sep 2017
Posts: 88

PostPosted: Sun Aug 26, 2018 12:52    Post subject: Reply with quote
i may buy on of these reliably shielded 3' cable;

https://www.tripplite.com/usb-3.0-superspeed-keystone-jack-type-a-extension-cable-3-ft~U324003KJ

and will post a follow up once it's installed.

i made the attached graphic to illustrate how a usb3 device
can interfere with 2.4 wifi particularly on fringe devices.
one could argue it's within the margin of error, but i would
respond that the average SNR will be 10%-20% different.
d0ug
DD-WRT Guru


Joined: 31 Jul 2015
Posts: 757

PostPosted: Wed Oct 24, 2018 4:34    Post subject: Reply with quote
My guess is it won't make a whole lot of difference. You are still going to be dealing with relatively unshielded traces within the router's motherboard. I doubt eliminating the extra cm or two of unshielded traces within the SSD itself will make a whole lot of difference.

One thing you could try is wrapping the SSD in aluminium foil then wrap some bare wire around the foil wrapped ssd and run that back to the power cable on your router and wrap it around the grounded barrel plug. This should shield the whole thing outside of your router. Confirm before hand that your power plug is actually a center positive plug or you might just end up with a short circuit.

Unfortunately this is a well known problem with many routers that contain USB3 ports. These should have never been included on routers and instead opted for ESATA.

Now seeing your screen shot, considering that your noise floor does not change at all between having the USB3 plugged in or not. I don't think this is your issue. The number on your noise floor should be getting smaller if interference is your problem.

For example if your noise floor changed from -106 to -80 i would say it is interference.
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