Menu
▾
▴
Re: [Openbts-discuss] can't find network w/ openbts-uhd on n210 - next steps?
|
From: keith <wh...@gm...> - 2011-11-30 08:34:52
|
Andy, in case it's of any use to you, I got my N210 working perfectly again last night. The history of this unit is that I had deployed it once before, and it worked really well without the GPSDO connected. Due to time constraints and in order not to break what was working, I left it that way. A few days ago I began a new installation. this time behaviour was very strange, phones would not see, then see the ent, connect at times, at times not - calls would fail, OpenBTS wouldn't respond.. paging the MS would fail. then it would work on one handset all of a sudden, and once call was established in would tend to remain so. then after hangup, once again nothing. all the typical clock issues, I suppose. You say you can't connect the GPS antenna. From what I have seen over the last 24 hours, you're going nowhere without it, although at the same time, it is totally bizarre that my N210 worked flawlessly at first without the GPSDO connected! The firmware and driver I was running before did not support the GPSDO so I installed the master branch (latest) driver from git. This is UHD_003.004.000-6b46d2c. I had problems, I tried Thomas's kal program, but I got 'no packet received, implementation timed-out' on scanning. I mailed Thomas and he suggested going back to UHD_003.003.001 which I did and with that it worked perfectly, I got some really nice results with kal using a local GSM900 station. best was +12Hz So I fired up the version of OpenBTS 2.6-uhd that I was using before. - Worked perfectly. Unfortunately I did all this kind of late and I didn't log steps - It's odd I don't seem to remember re-compiling OpenBTS against the new 003.003.001 uhd driver, but surely I must have... Anyway, did you get to pull the git code yet? Maybe I can get it for you and send it if you still have network issues. On 29 November 2011 22:54, Andy Myers <aw...@gm...> wrote: > On Tue, Nov 29, 2011 at 2:22 PM, Alexander Chemeris > <ale...@gm...> wrote: >> >> Just to make sure - what is your TX attenuation settings and what is >> your hardware setup? Do you use antennas, or not, how far do you place >> the phone, etc? > > TX attenuation slowly ramps down over time. I'm using the parameters > in the OpenBTS.config.example: > > GSM.PowerManager.MaxAttenDB 30 > GSM.PowerManager.MinAttenDB 7 > > GSM.Band 900 > GSM.ARFCN 75 > > I'm using the vert 900 antennas from ettus for both rx and tx. I've > tried the phones at various distances. At first it was 3 feet away > but I've since moved them to a different room about 20 feet away. > I've used some other GSM equipment with about 150 - 200ft of antenna > spacing (and a steel door). After the bts fully ramped up I was > seeing a pretty clear GMSK spectrum rising 20db or so out of the noise > floor. It does tend to get *very* loud. I may play with MinAttenDB > to keep it reasonable. > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure > contains a definitive record of customers, application performance, > security threats, fraudulent activity, and more. Splunk takes this > data and makes sense of it. IT sense. And common sense. > http://p.sf.net/sfu/splunk-novd2d > _______________________________________________ > Openbts-discuss mailing list > Ope...@li... > https://lists.sourceforge.net/lists/listinfo/openbts-discuss |
