UmTRX aka OpenBTS HW update

Jean-Samuel Najnudel - BJT PARTNERS SARL jsn at bjtpartners.com
Tue Oct 11 13:37:40 UTC 2011


Hi Alexander,

Thank you very much for your reply. In this case, it looks good.

Best regards.

Jean-Samuel.
:-)


On Tue, Oct 11, 2011 at 3:16 PM, Alexander Chemeris <
alexander.chemeris at gmail.com> wrote:

> Hi Jean-Samuel,
>
> On Tue, Oct 11, 2011 at 17:11, Jean-Samuel Najnudel - BJT PARTNERS
> SARL <jsn at bjtpartners.com> wrote:
> > Hi Alexander,
> >
> > I looked at the schematics and PCB. I did not notice anything bad.
> However,
> > I am not really able to check everything.
> >
> > Anyway, I just have two questions.
> > 1/ There is a CLKIO connector. As I can see on the schematics. We can set
> > this as a clock output (master) or input (slave). This looks perfect if
> we
> > want to synchronize 2 boards together (1 master output connected to 1
> slave
> > input). If we need to synchronize 3 boards together (trisector
> > configuration), how could we connect them together ? Can we split the
> clock
> > output signal to connect it to the 2 slave inputs ? If yes, everything is
> > fine. If not, we might need 1 ouput and 1 input on the board (instead of
> 1
> > output or 1 input) to allow us to daisy chain the boards. What do you
> think?
>
> Andrey says we can connect 3 to 5 units to a single output easily. We
> just need to make a "splitter-cable".
>
> > 2/ On Image2, I can see 3 components outside the board near the 6 pin
> > connector. Is this normal ?
>
> Yes this is normal, as layout is not 100% finished yet. If there is no
> serious objections or additions, we're going to start final layout
> iteration immediately. It will take about a week more to polish
> everything.
>
>
> --
> Regards,
> Alexander Chemeris.
>
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