2 Dec
2010
2 Dec
'10
7:29 p.m.
Hello Sylvain,
On Thu, 2 Dec 2010 15:20:07 +0100, "Sylvain Munaut" <246tnt(a)gmail.com>
wrote:
The clock of the non working one might just be too off ...
See http://openbsc.osmocom.org/trac/wiki/isdnsync for a tool to
calibrate (with appropriate HW).
If you don't have the equipement ... huh, good luck.
You can always try random values until it works.
If you have a USRP you can try to lock onto it and compare offset ...
Its possible to set the clock calibration to a fixed value, this was
a feature introduced a while ago. The original clock calibration
setting workes pretty good, at least from my experience. So if the
clock is off due to using the E1 clock as a reference, it should be
enough to set the orginal clock calibration value and switch the
PLL to standalone mode.
Best regards,
Dieter
--
Dieter Spaar, Germany spaar(a)mirider.augusta.de
2 Dec
2 Dec
7:08 p.m.
New subject: bs11 not working
Hello Dieter,
I had once or twice seen BTS stations which had working PLL value
very different from calibrated value. In order to get them close I had to
use E1 hardware with high precision oscillator, then switch the
hardware to the PLL-locked mode. This operation took me plenty
of time.
Please tell, is it possible to set the working PLL value directly?
Best Regards,
Sergey.
On Dec 2, 2010, at 6:29 PM, Dieter Spaar wrote:
Hello Sylvain,
On Thu, 2 Dec 2010 15:20:07 +0100, "Sylvain Munaut" <246tnt(a)gmail.com>
wrote:
The clock of the non working one might just be too off ...
See http://openbsc.osmocom.org/trac/wiki/isdnsync for a tool to
calibrate (with appropriate HW).
If you don't have the equipement ... huh, good luck.
You can always try random values until it works.
If you have a USRP you can try to lock onto it and compare offset ...
Its possible to set the clock calibration to a fixed value, this was
a feature introduced a while ago. The original clock calibration
setting workes pretty good, at least from my experience. So if the
clock is off due to using the E1 clock as a reference, it should be
enough to set the orginal clock calibration value and switch the
PLL to standalone mode.
Best regards,
Dieter
--
Dieter Spaar, Germany spaar(a)mirider.augusta.de
4902
days inactive
4902
days old
1 comments
2 participants
participants (2)
-
Dieter Spaar -
Sergey V. Efimoff