Use OsmocomBB as OpenBTS / airprobe clock generator

Fadil Berisha f.koliqi at gmail.com
Wed Mar 14 18:33:47 UTC 2012


Hi Martin,

I'd like to suggest you to consider clock-tamer or new design as
external clock for USRP -  http://code.google.com/p/clock-tamer/ .  It
is open source software and hardware project and it is was
specifically designed to be used with USRP. It is possible to use
phone as external clock for openBTS, but except proof of concept, that
solution does not have practical value.

Regards

Fadil



On Wed, Mar 14, 2012 at 10:54 AM, Martin Janovský <martian at seznam.cz> wrote:
> Hi guys,
>
> I'd like to build a test scenario for my thesis based on a Motorola C123 and
> a PLL such as this
> http://search.digikey.com/us/en/products/ICS501MLFT/800-1036-1-ND/1916104
>
> Like this, I'd feed the multiplied clock to a USRP1 to run OpenBTS reliably.
> Would you help me choose the correct PLL if you understand the topic? I have
> little experience with circuit design.
>
> Regards,
>
> Martin Janovský
>
>
> Dne 21.1.2011 17:47, Steve Markgraf napsal(a):
>
>> Hi,
>>
>> On 11.04.2010 17:54, Steve Markgraf wrote:
>>
>>>> The third one is MCLK, i.e. the clock that the Calypos PLL feeds into
>>>> the ARM core.
>>>
>>> Ah, okay. But this one isn't accessible on all currently known phones
>>> anyway.
>>
>> Just as an update on this idea: The Pirelli DP-L10 I have been playing
>> around with recently exposes the MCLK pin.
>>
>> I've added a summary in the wiki:
>>
>> http://bb.osmocom.org/trac/wiki/PirelliDPL10#Phoneasclockgenerator
>>
>> Regards,
>> Steve
>>
>>
>




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