osmo-(bts-)trx multi-trx is broken

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Keith keith at rhizomatica.org
Fri Mar 3 16:38:19 UTC 2017


On 03/03/2017 13:17, Max wrote:

>
> I've tested with -x and external clock already. Unfortunately I can't
> promise to dig deeper with spectrum analyzer any time soon due to
> other tasks at hands. Could you please attach your known-to-work
> config files to #1648 so we have some reference point for future tests?
>
> On 03.03.2017 12:59, Alexander Chemeris wrote:
>
>> On general, if everything starts and you don't see a network, it's
>> most likely a clock or RF issue.
>>
Hi all, I may be way off here, but maybe worth saying, three days ago
trying to track down probs with AMR, I compiled and tested everything
from master, all deps + osmo-bts-trx and osmo-trx. I ran against my
standard nitb on another box though.
osmo-bts at 75852294
osmo-trx at 2dee3e99
Everything stated up fine but phones saw no network.

So I checked the RF with an RTL-SDR and I had a very narrow band
"silent" signal in the centre of the channel until I manually set
osmotrx tx-attenuation in the vty:

phy 0
 instance 0
  osmotrx tx-attenuation 35

I mention it because your latest cfg attached to the ticket has
osmotrx tx-attenuation oml
which is also the default I believe, in the absence of the command in
the cfg. and it didn't work for me.
At time I just presumed it should with a newer nitb.
I only have an N210 so I can't test multi-trx :-(

k/





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