Topic: Which USB hub to use with Block Erupters | NanoFury NF1 | BPMC Red Fury | Ant U1 - page 24. (Read 128592 times)

Is there a way to measure the amount of power coming froma USB port?

I only tried using the USB 2.0 ports

I have the same exact hub and the same exact issue. The power supply specs are as advertised, and it ran 5 for a while without errors (never tried 6). After a few days I was only able to run 3, then after another day or so that changed to 2; I've been running 2 for a few days without incident. I will be returning it as soon as I receive the new hubs I ordered, but in the meantime I will experiment with 2.0/3.0 ports both on the hub as well as the host to see if it makes any difference. As of now it's been running on a netbook running xubuntu 12.04 plugged directly into a 2.0 port.

Update: I tried plugging the hub into a 3.0 port on my Windows PC, and cgminer would not detect the devices at all. I also tried switching between the 2.0 and 3.0 ports on the hub and it made no difference. I opened up device manager and saw that it was constantly refreshing, with "Etron USB2 (HS) Hub" repeatedly disappearing and reappearing. I unplugged the hub and went to plug it back into my netbook when I noticed that, with the USB cable unplugged, the hub seemed to be receiving no power whatsoever; neither the LEDs on the hub nor the LEDs on the block erupters were lighting up. I tried plugging my tablet into the charging port and it didn't get any power. I then plugged the hub back into the netbook, removed the AC adapter from the hub, and it made no difference; it still ran 2 block erupters without error, which is quite surprising, especially since its a netbook.

TLDR: Power supply is completely dead. As far as I can tell the hub itself is fine.

Oh, OK.  Thanks for clarifying.  I was stuck at 2.0.

It seems only the USB 3.0 ones do as they are required to be able to supply 0.9A per port (http://en.wikipedia.org/wiki/USB_3.0).

I didn't know USB hubs have built-in 12V to 5V converter.  If so, why are most if not all of them are powered with 5V wall warts instead of 12V?  I'm confused.

Are you referring to 12V adapters which follow USB 3.0 hubs? The USB ports themselves feed 5V with the hubs doing conversion.

maybe something with the 2.0/3.0 mix. which side were you using 2.0 or 3.0?

That looks like the generic Chinese/MCM hub but with a different PSU and cosmetics.

I guess I misunderstood you.  I thought you said you got the four hubs from MCM.  In that case, I sure would like to buy some at your campus store if I get more miners in the future.  Which campus is that?  Perhaps you should add a link to the guide so people on here can buy them cheap.  Alternatively, I already found a really dirt cheap source in China for the hubs and planning on pairing them with an 8A PSU which should give me some headroom when populating all seven ports.  Like I said in my original post, I tested seven miners on the hub for a few hours and didn't experience any issues except for the fact that the wall wart got very warm though not uncomfortable to the touch.

Another cheap Hub USB: aprox 15€

SONYTEC HUB NEXOOS 395

7 Ports (2 vertical behind)

5 V 3 Amp

Test ok with 5 USB Erupters in Windows 7, Windows Xp and Debian (Cgminer (last version) and BFgminer)

I have personally confirmed that they have the 3.5A PSU (I have 4 in hand).  This is from my campus electronics supply store.

Are you able to fit miners in the back ports?  Have you tried mining with all 7?  Also, how do you have the hubs connected (daisy chain or hub-spoke)?

Great setup once again.

Dan

My guide is based on other people's experience. 6 was a theoretical limit, given a 3A AC adapter (as per reviews/remarked in footnote). How strong is the adapter that you recevied? What do you connect this hub to (another hub/directly to PC)?

Main table has been updated and split into 3 distinct categories.

I just received a Juiced Systems USB 3.0/2.0   13 (4x3.0, 9x2.0)
Your guide says it can run 6, but that is total bs!
I can run 3 MAX on this thing before I start getting more hardware errors than accepts. As soon as I plug in a 4th I get nonstop errors. Here is a picture from when I woke up this morning. The BAJ is a BFL Jalapeno
http://img.photobucket.com/albums/v239/mikestrike/wat_zps9a9b5f86.png

I had 5 plugged in. After messing around for a while, I finally got it to stop showing USB AMUx READ BUFFERING XXX EXTRA BYTES and have all of them mining correctly with 1% or less error rate. I had to reduce the number connected through this hub to THREE before the errors went away!

+1

+1

He he, just found one that can be stacked!

http://www.amazon.co.uk/Revoltec-7-Port-USB2-0-Stackable-RZ055/dp/B002NQSE4I
http://www.ceneo.pl/7395777

Alas, as I see it, it's port layout will allow only for 3 BEs to be connected. Also, I cannot find the power adapter specs anywhere. So it will not be added to the main table.