USB hubs for ASICs - page 5. | Bitcointalksearch.org

freeAgent

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Quote from: Morblias on October 02, 2012, 02:49:16 PM

Quote from: freeAgent on October 02, 2012, 02:45:19 PM

Assuming the Jalapeno power requirements are accurate and it operates on 5v, you'll need the following formula for amp output in any USB hub: .9 * (number of Jalapenos) = Amperage output of USB hub. That Mondohub linked to in the OP outputs 4A (or 20 watts), so you'd only be able to run 4 Jalapenos on it, wasting 16 ports. That also assumes the Jalapeno powers itself with two USB plugs.

Wow I did not know this, I am an idiot when it comes to electrical stuff. I just plug it in and hope I don't start a fire. I did one of my single trade-ins for 8 Jalapenos just for the hell of it, so I will need a lot of usb ports for those plus the SCs and bASICs I ordered.

Yeah, given the prices, you'd be better off getting 4 of the Belkin USB hubs I linked to and using those. They're $20 each and power 2 Jalapenos vs $60 each for 4 Jalapenos. I hope you've got 4 open USB ports on your computer (or multiple computers)

Morblias

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Quote from: freeAgent on October 02, 2012, 02:45:19 PM

Assuming the Jalapeno power requirements are accurate and it operates on 5v, you'll need the following formula for amp output in any USB hub: .9 * (number of Jalapenos) = Amperage output of USB hub. That Mondohub linked to in the OP outputs 4A (or 20 watts), so you'd only be able to run 4 Jalapenos on it, wasting 16 ports. That also assumes the Jalapeno powers itself with two USB plugs.

Wow I did not know this, I am an idiot when it comes to electrical stuff. I just plug it in and hope I don't start a fire. I did one of my single trade-ins for 8 Jalapenos just for the hell of it, so I will need a lot of usb ports for those plus the SCs and bASICs I ordered.

freeAgent

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Instead of buying a ton of Jalapenos, why not buy Singles? They presumably won't get their power from the USB anyway, so pretty much any hub should work. You may also want to check out which hubs people are using for Raspberry Pi devices. The Raspberry Pi is extremely picky when it comes to USB, so anything that works with it is pretty well designed. You'd want to go with the ones with the highest power ratings: http://elinux.org/RPi_VerifiedPeripherals#Working_USB_Hubs

I use this one, but it sounds like you want more ports. It's got a pretty good port:power ratio though (2.6 Amps and only 4 ports). It should be good to power two Jalapenos: http://www.amazon.com/Belkin-Ultra-Slim-Series-4-Port-F4U040v/dp/B005A0B3FG/

Assuming the Jalapeno power requirements are accurate and it operates on 5v, you'll need the following formula for amp output in any USB hub: .9 * (number of Jalapenos) = Amperage output of USB hub. That Mondohub linked to in the OP outputs 4A (or 20 watts), so you'd only be able to run 4 Jalapenos on it, wasting 16 ports. That also assumes the Jalapeno powers itself with two USB plugs.

Mobius

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Quote from: Morblias on October 02, 2012, 10:18:24 AM

In preparation for ASICs, what USB hubs do you have/are going to buy?

I am currently leaning towards http://www.manhattan-products.com/en-US/products/9583-mondohub

The ports are only 500mA, but I am assuming BFL Jalapenos will have something like dual usb inputs.

You need to determine if redundancy is important, 1 large hub = single point of failure, Multiple smaller hubs will spread out the risk and allow some margin of safety. One fails and you can plug into the others. Also make the determination if you will need USB 3.0 ports before buying.

Desolator

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The problem with USB hubs is there aren't any "good" ones. There are only okay ones. Newegg has 254 of them and none have significant numbers of high ratings. If you want one that probably won't fail too soon, I'd go with basically anything without horrific ratings from:

Inland
Bytec
SIIG
Koutech
Belkin
Hawking
US Robotics
Kensington
TrendNet
Sabrent

A lot of those companies make some pretty bad ones but they also carry a couple that are pretty nice.
Ultra "makes" really bad products but their hubs I've had a lot of luck with too. (they don't make anything, they buy OEM and put their name on it).

if I had to buy one right this second, I'd say none of the above and get this beast:
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4621333&CatId=392
not a bad price either

kjlimo

legendary

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I think you might run into logistical issues of keeping all the units & power cords that close together even if you have 28 units.

I bought a $7 cheap 10 port powered USB and I'm regretting it. It stops working and loses connection about 1-3 hours after starting...

So I'm looking to spend more like $30 for a decent one.

squall1066

copper member

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Wow 28 ports!! someone has a lot of pre-orders! Grin

I will just be getting a 10 port powered USB hub

Morblias

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In preparation for ASICs, what USB hubs do you have/are going to buy?

I am currently leaning towards http://www.manhattan-products.com/en-US/products/9583-mondohub

The ports are only 500mA, but I am assuming BFL Jalapenos will have something like dual usb inputs.

Topic: USB hubs for ASICs - page 5. (Read 16439 times)