This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/OpenBSC@lists.osmocom.org/.
Sergey V. Efimoff risky at mail.ruHello 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.