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Voltage drop will also occur over the back-feed prevention diode which is sometimes omitted in cheaper hubs. Compared to USB 2. You may have a compatibility issue with your USB3 controller see if there are any driver or firmware update for it or just an unlucky, poorly manufactured unit with possibly a marginal timing crystal. May 28, at 4: But there was always one thing nagging me — while USB 3. You can try switching cables, and ensuring you push the cable in all the way.

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To hub, or not to hub?

If you have the flash, then there is a leaked firmware upgrade tool, which may fix the problem. Aside from that, there were a few small solder splashes, but I removed the loose solder by hand before taking the photo.

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March 14, at 7: In order to do all of this as cheap as possible without breaking backwards compatibility — they had to introduce a new row of conductors buried inside the Gk3520 connector and straddling on the side of the various types of B connectors creating cable-compatibility issues — i. It does have a backfeed prevention diode, which is good, and it does work with my USB 3. Hubs can also have an impact on the performance of your older USB 1.

Voltage drop will also occur over the back-feed prevention diode which is sometimes omitted in cheaper hubs. It does work, although it could do with proper port overcurrent limiting, although this is only a minor safety concern when not powered with external power. ,ogic 1, at Also note that bus-powered hubs will often cause problems with devices which are not self powered — as the cable length and traces will cause voltage drop due to resistance — so attaching drives to bus powered hubs is a definitely no-no.


I try to separate shell cover using penis, now very sore. March 3, at 9: September 17, at 7: April 22, at 3: December 4, at 6: Since the GenesysLogic usb3. In light of this, finding a good hub is important for the reliability of the connection of devices attached to it.

This is because USB 2. But there was always one thing nagging me — while USB 3. Notably absent are any polyfuses gl352 current measuring shunts — so there is no port over-power protection by the looks of it.

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When I connect anything USB 3. March 15, at 5: Other hubs can loigc let down by simple things like poor soldering and poor quality connectors which cause intermittent USB connection. Beware that everything working with firmware can contain viruses inside….

Thank you for this tecnical tip. I guess we can put this down to cost cutting on behalf of the chipset makers and motherboard manufacturers — high speed USB 3. Possible I am the only one with eyes and able to see that output ports are plain USB 2.


Quick Review: Cheap Unbranded 4-port USB 3.0 Hub from eBay

At first I thought the old driver caused the hub to enumerate on the wrong controller, but after reading your explanation about the HW appearing as two separate hubs, I realized it simply mapped as a USB2 hub on the USB2 hub tree of the same Renesas controller to which it was hooked up.

But there is an external power backflow prevention diode, and what appears to be a transistor to switch between bus and external power. Good news, sort of — since Genesys Logic products seem to be fairly decent nowadaysbut early on in the USB 1. There is also an inductor and a small ChongX capacitor which appears to filter the incoming power — although the capacitor itself is from a questionable manufacturer and seems a bit small for the job.

As for what hub you got, none of us can say since there are no photos of your hub. OTOH if you upgrade it and it now works properly.