BTS using osmocombb trx

Christian Schulte cs at saturn2.franken.de
Wed Jan 29 17:20:05 UTC 2014



Oh i am sorry. I think i got it.
osmobts-trx was not running.
There was simply no configuration being
distributed from layer2 to layer1.
(as far as i understand it)
That guide is quite useful but also quite lengthy :D
http://openbsc.osmocom.org/trac/wiki/network_from_scratch


  cheers, Christian


On 01/29/2014 05:36 PM, Christian Schulte wrote:
.....
> 
> Now i wanted to communicate with a second phone and
> have tried setting up a BTS following this guide
> 
> http://openbsc.osmocom.org/trac/wiki/network_from_scratch
> (using a single phone)
> 
> My problem is that the phone doesnt transmit anything.
> Yes i have enabled the transmitter flag in the Makefile. ;)
> When i use osmocon to load the TRX into the phone and start the
> osmocom-transceiver i get this debug output from osmocon.
> 
> ...
> Synchronize_TDMA
> =>FB @ FNR 26585 fn_offset=2002505 qbits=4924
> LOST 1910!
> BTS MODE: 255 65535 {0,0,0,0,0,0,0,0} TX 0..7 RX 0..7
> 
> 
> After taking a look at the code the values seem weird
> and they come from the transceiver function l1ctl_tx_bts_mode()
> like that.
> /host/layer23/src/transceiver/l1ctl.c:120
> 
> As a test i got the phone to transmit something by
> overwriting the values on the TRX side.
> 
> I havent gone further yet but wanted to ask if someone could
> maybe point me to an obvious mistake i did before i
> spend more hours on this issue.
> A hint as to how i enable the different logging settings
> would be great as well.
> 
> 
>   thanks,
>   best regards, Christian
> 
> 
> 
> 





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