+5 V barrel by a lab power supply 5V/5Amps
the current is 500 mA and the modem works perfect in Angstrom

-----Original Message-----
From: [email protected] [mailto:[email protected]] On 
Behalf Of Robert Nelson
Sent: Friday, December 20, 2013 5:01 PM
To: Beagle Board
Subject: Re: [beagleboard] CPU freq

On Fri, Dec 20, 2013 at 8:42 AM, Bogdan Teodorescu 
<[email protected]> wrote:
> I just wanted to better document the problems.
> Some of them:
> If I put USB modem Huawei 3772 direct into  the USB connector it 
> flashes and then the power is cut off

Is the device powered by USB or the 5volt barrel connector? (what rating)

> If I put a USB hub between the same, but if I put another device into 
> the hub everything is OK and I manage to work with the modem

If that fixes it, then your USB modem is crap, taking way too much current on 
startup..

Regards,


--
Robert Nelson
http://www.rcn-ee.com/

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