Use OsmocomBB as OpenBTS / airprobe clock generator

Kurtis Heimerl kheimerl at cs.berkeley.edu
Wed Mar 14 22:03:48 UTC 2012


I think the osmocomBB signal generator would be a great idea;
clock-tamers are significantly more expensive than calypso phones.

2012/3/14 Fadil Berisha <f.koliqi at gmail.com>:
> 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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