Hello Harald,
On Dec 3, 2010, at 2:22 AM, Harald Welte wrote:
On Thu, Dec 02, 2010 at 09:58:23PM +0300, Sergey V.
Efimoff wrote:
But right after the very first GSM call the
receive level quickly jumps down
to -70 or even -80 dBm, this value corresponds to 30mW of output power. BTS
station still works and output power is still shown as 2W.
In case you are running a multi-TRX BTS: is this the received power level on
the TCH of the call or on the BCCH ? If downlink power control is active, the
BTS will not send more power than needed on a dedicated channel...
The receive level is shown for BCCH.
This effect
had been discovered with only one of my BTS stations, while other
stations work well. Does it mean that it's a hardware problem? Has anyone
discovered this problem earlier?
Are the other BTS's configured exactly the
same way? As explained, the
difference single-trx / dual-trx and downlink power control might explain it.
Yes, other stations are configured exactly the same way.
otherwise, if configuration of bs-11, openbsc and the
bs11 firmware is
identical, it might well be a hardware issue. But I don't get why it would
be related to the first call or not...
I am confused. I did not observe this effect earlier on this station. And I do not
observe it on other stations. I also don't know why this effect appears after
the first call. It really seems to be a hardware problem.
Best Regards,
Sergey.