p4trykx
Posts: 127
Joined: Wed Jan 11, 2012 2:55 pm

most reliable USB hub

Thu Aug 09, 2012 3:34 pm

Some people claim that USB problems occur with only few devices. Maybe I'm extremely unlucky but all my usb devices have issues working with Raspi.
I tried
Modecom Wave 7 port powered hub
Targus 7 port powered hub
4 port integrated hub in AOC monitor.
All those does not work properly with 3G modems and keyboard/mouse or webcam.

I want to choose between those. Will those hubs work with 3G modems? Have anyone some personal experience with them?
LogiLink
UA0085 USB 2.0 Hub, 4-Port with PSU 5V, 2A
UA0160 USB 2.0 Hub, 4-Port with PSU 5V, 2A. Able to power the RPi, keyboard, mouse and LogiLink UA0144 USB ethernet adapter. (More testing to come.)

Sitecom
CN-032 4 Port USB 2.0 Pocket Hub. Works for powering the Pi, an USB WLAN Adapter, wireless Kbd+Mouse. Using an 2500 mA Voltcraft
CN-060 4 Port USB 2.0 Hub powered with AC Adapter (1A). Powering Pi via microUSB from a hub port.

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RaTTuS
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Re: most reliable USB hub

Thu Aug 09, 2012 3:40 pm

dunno
YMMA
I've just been playing with a couple of usb wireless things and I've noticed a few issues
1) one of them causes a massive ammount of errors to be logged and then will lock the RPI when it is removed -
2) another works fine, produces no errors in the logs but seems to reduce the speed of the RPi responsiveness by 10-20% :-(
now I've not had a proper look as I'm busy doing a lot of other stuff but, I've gone back to having a wired connection for the moment.
How To ask Questions :- http://www.catb.org/esr/faqs/smart-questions.html
WARNING - some parts of this post may be erroneous YMMV

1QC43qbL5FySu2Pi51vGqKqxy3UiJgukSX
Covfefe

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Montala
Posts: 675
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Re: most reliable USB hub

Thu Aug 09, 2012 3:49 pm

Based on what I have read in other threads, I reckon that a four port hub has more chance of working as expected that a seven (or more) port hub.

It is also important (IMHO) to check the voltage under 'load' at TP1 and TP2 on the RasPi board, as I found that even using a PSU with a quoted 2A output, the voltage dropped by 0.5V with the hub (which was also feeding the RasPi via a 'Y' cable), a Logitech K400 dongle and an Asus USB-N10 Wi-Fi adapter connected.

I was actually very pleased with the wireless connection, but I also plan to experiment using a small wireless router in 'client;' mode, which I am hoping will not then require the use of a powered hub, as I will only have the dongle plugged into the USB ports on my RasPi.

p4trykx
Posts: 127
Joined: Wed Jan 11, 2012 2:55 pm

Re: most reliable USB hub

Thu Aug 09, 2012 7:28 pm

Montala wrote: It is also important (IMHO) to check the voltage under 'load' at TP1 and TP2 on the RasPi board, as I found that even using a PSU with a quoted 2A output, the voltage dropped by 0.5V with the hub (which was also feeding the RasPi via a 'Y' cable), a Logitech K400 dongle and an Asus USB-N10 Wi-Fi adapter connected.
I'm constantly monitoring voltage. It's about 4.8 under stress. I even shorted the polyfuses to get rid of the voltage and rule out any brownouts.
In a desperate act I plan to power Raspi directly throug GPIO pins and LM7805 5V linear voltage regulator and add some 'huge' capacitors.

Could you tell me which model of hub are you using?

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Montala
Posts: 675
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Location: Herefordshire (U.K.)

Re: most reliable USB hub

Thu Aug 09, 2012 9:46 pm

p4trykx wrote:
Montala wrote: It is also important (IMHO) to check the voltage under 'load' at TP1 and TP2 on the RasPi board, as I found that even using a PSU with a quoted 2A output, the voltage dropped by 0.5V with the hub (which was also feeding the RasPi via a 'Y' cable), a Logitech K400 dongle and an Asus USB-N10 Wi-Fi adapter connected.
Could you tell me which model of hub are you using?
Yes, certainly... it is a Newlink NLUSB2-224P 4 port hub, although I am using a 2A PSU rather than the 1A one it came with.

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Montala
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Location: Herefordshire (U.K.)

Re: most reliable USB hub

Thu Aug 09, 2012 10:42 pm

I left it too late to edit the above post, but I meant to add that my voltage across TP1 and TP2 with everything connected and 'working' was 4.98V which I was quite happy with!

lintweaker
Posts: 33
Joined: Mon Jul 09, 2012 6:26 pm

Re: most reliable USB hub

Fri Aug 10, 2012 7:39 am

I have 3 different powered hubs (I was surprised I even had that many :) ) but unfortunately they all have problems.

It is possible that a powered HUB delivers power back to the Pi.
What is the consensus on that being part of the issue or even being the issue?
I have not managed to get a cable to connect a hub to the Pi where the power lines are cut to see if that improves the situation.

p4trykx
Posts: 127
Joined: Wed Jan 11, 2012 2:55 pm

Re: most reliable USB hub

Fri Aug 10, 2012 7:45 am

I also cut the 5V wire for my hub but I discovered that it's actually powered from that line so for some hubs cutting will make them not work at all.

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