Alexander Chemeris wrote:
Could you please provide more details about your setup and experiments
you did?
E.g. what PC so you run it on, what is the CPU utilization, have you
tried to run it with real-time priority, what exactly you feed into
the osmo-trx and what do you see on your monitoring phone, how exactly
long is "longer", etc
We noticed, that Linux kernel 3.3 had issues with 1GbE chips from
Intel, so we switched to the kernel version 3.8, which works stable.
We use kernels from the stock Ubuntu Server 12.04.
dear alexander,
sorry, but this was my fault. here is the reason why i have only RF
power on two slots:
- i configured TS 0 with CCCH and TS1..TS7 with SDCCH8
- i set bts type at osmo-nitb to "nanobts", which rejects SDCCH8 on TS2..TS7
- no "Set Chan Attr" was sent from osmo-nitb to osmo-bts for TS2..TS7,
so osmo-bts did not send SETTSC to osmo-trx.
the thing is that the transceiver will only send bursts to umtx, if
SETTSC was given. (makes sense)
i found out that sending no butsts from osmo-trx to the transceiver will
cause no RF output. this is why osmo-bts sends dummy bursts for the
first TRX, so there is RF power on all TS all the time. on other TRX,
osmo-bts send bursts, only if the logical channel (the bursts belong to)
is activated. this is the way it is done to reduce noise on the
spectrum. i can see it one the osmocombb-RSSI application. once a
channel was activeated, there will be RF power on the specific TS, even
when osmo-bts does not send bursts anymore. i guess that some filler
table of osmo-trx causes it. i think it would be nice if osmo-trx would
stop transmitting, when there are no more bursts comming from osmo-bts.
(at least after a while.)
best regards,
andreas