# \-------'Range' network is not detected------- **URL:** \ **Category:** GNU Radio\ **Created:** [March 24, 2015, 5:35am UTC](https://www.ruby-forum.com/t/range-network-is-not-detected/234712 "2015-03-24T05:35:06Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [March 24, 2015, 5:35am UTC](https://www.ruby-forum.com/t/range-network-is-not-detected/234712/1 "2015-03-24T05:35:06Z")
Hi all, I have recently installed OpenBTS-2.8 on a Banana-Pi (Processor: ARMv7) board for USRP N210 functioning. All the prerequisites including GNURadio, UHD were successfully built on the board prior to OpenBTS installation. With all configurations done, still there is a problem in the USRP connection. I have configured MCC, MNC and ethernet IP connection. “ping 192.168.10.2” works fine. Once the ethernet connection is established and until “./OpenBTS” is executed, “uhd\_find\_devices” and “uhd\_usrp\_probe” detect USRP. After the execution of “./OpenBTS”, surprisingly “uhd\_find\_devices” and “uhd\_usrp\_probe” do not detect the device and say “No device found…” (‘ping’ is still working though). The strangest thing is even at this stage, “./OpenBTS” works fine even at a re-run. After all these drama, no (‘range’) network is detected by a properly configured mobile phone. (Note: We have successfully placed calls and SMS with almost same procedure using a PC instead of B-Pi). I am bit confused here whether this is a deal of OpenBTS or GNURadio. Does the processor speed come in to play in this scenario? Any valuable suggestions would be highly appreciated. Thank you. Zamrath N. ---
**Author:** ![Zamrath\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/b487fb/32.png) [@Zamrath\_N](https://www.ruby-forum.com/u/Zamrath_N)\ **Post date:** [March 24, 2015, 7:48am UTC](https://www.ruby-forum.com/t/range-network-is-not-detected/234712/2 "2015-03-24T07:48:43Z")
First of all, it is normal that the USRP is not detected anymore with the uhd tools when it is claimed by OpenBTS. So this looks not alarming. Are you able to verify if RF is transmitted? Is there some spectrum analyzer available, or a receiver that can tune into the used GSM frequency, best is AM mode and open squelch, to see if a carrier is present? This way you can find out if it transmits at all, and if so, it must be continously, uninterruptes, without stuttering. I assume your successful tests used the very same USRP, so the frequency should not be off too far?! Ralph. From: Zamrath N. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] Sent: Tuesday, March 24, 2015 5:33 AM To: removed\_email\_address@domain.invalid; GNURadio D.ion List Subject: [Openbts-discuss] -------‘Range’ network is not detected------- Hi all, I have recently installed OpenBTS-2.8 on a Banana-Pi (Processor: ARMv7) board for USRP N210 functioning. All the prerequisites including GNURadio, UHD were successfully built on the board prior to OpenBTS installation. With all configurations done, still there is a problem in the USRP connection. I have configured MCC, MNC and ethernet IP connection. “ping 192.168.10.2” works fine. Once the ethernet connection is established and until “./OpenBTS” is executed, “uhd\_find\_devices” and “uhd\_usrp\_probe” detect USRP. After the execution of “./OpenBTS”, surprisingly “uhd\_find\_devices” and “uhd\_usrp\_probe” do not detect the device and say “No device found…” (‘ping’ is still working though). The strangest thing is even at this stage, “./OpenBTS” works fine even at a re-run. After all these drama, no (‘range’) network is detected by a properly configured mobile phone. (Note: We have successfully placed calls and SMS with almost same procedure using a PC instead of B-Pi). I am bit confused here whether this is a deal of OpenBTS or GNURadio. Does the processor speed come in to play in this scenario? Any valuable suggestions would be highly appreciated. Thank you. Zamrath N. ---
**Author:** ![Zamrath\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/b487fb/32.png) [@Zamrath\_N](https://www.ruby-forum.com/u/Zamrath_N)\ **Post date:** [March 24, 2015, 4:21pm UTC](https://www.ruby-forum.com/t/range-network-is-not-detected/234712/3 "2015-03-24T16:21:46Z")
Thanks for the early reply Ralph. > > > First of all, it is normal that the USRP is not detected anymore with > > > the uhd tools when it is claimed by OpenBTS. So this looks not alarming. Note that our successful implementation did not have any issue with UHD-USRP connection. It worked as it was before OpenBTS claims it. Hope this is ‘actually normal’ without interrupting the main intended functions. Right? Could I know the reason for USRP connection loss? > > > Are you able to verify if RF is transmitted? Is there some spectrum > > > analyzer available, or a receiver that can tune into the used GSM > > > frequency, best is AM mode and open squelch, to see if a carrier is > > > present? This way you can find out if it transmits at all, and if so, it > > > must be continously, uninterruptes, without stuttering. Yes. Oh no! Surely transmission LED (labeled A) is not working. Which means that there is a RF transmission problem in our build. Reading through several threads on similar problem, I don’t think it is a hardware issue, rather software compatibility issue. What would be the remedy for this? > > > I assume your successful tests used the very same USRP, so the > > > frequency should not be off too far?! Yes. The similar N210 version was tried with the same set of software. Could you please address above issues. Best, Zamrath N. On Tue, Mar 24, 2015 at 12:16 PM, Ralph A. Schmid, dk5ras [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![Zamrath\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/b487fb/32.png) [@Zamrath\_N](https://www.ruby-forum.com/u/Zamrath_N)\ **Post date:** [March 24, 2015, 4:31pm UTC](https://www.ruby-forum.com/t/range-network-is-not-detected/234712/4 "2015-03-24T16:31:24Z")
Hi Zamrath, > Could I know the reason for USRP connection loss? > there’s no connection loss – the USRP is just now talking to the > OpenBTS application, and won’t talk to other applications, including > uhd\_usrp\_probe. > Surely transmission LED (labeled A) is not working. > Ok, that means the USRP is not configured to receive samples, ie. the > software (OpenBTS) has not yet started to talk to it, possibly because > something went wrong. Since we already constantly cross-post with the > OpenBTS list (hi, people!), I recommend going through the output of > OpenBTS, and talking to the OpenBTS community about these messages. > I am bit confused here whether this is a deal of OpenBTS or GNURadio. > GNU Radio is completely unrelated to this problem – it’s not a part of > OpenBTS. > Does the processor speed come in to play in this scenario? > At this point, probably not. Even with a lot of Under-/Overflows, which > would be typical for a case of CPU bottleneck, the A LED should be > shining. Greetings, Marcus ---
**Author:** ![Zamrath\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/b487fb/32.png) [@Zamrath\_N](https://www.ruby-forum.com/u/Zamrath_N)\ **Post date:** [March 24, 2015, 5:10pm UTC](https://www.ruby-forum.com/t/range-network-is-not-detected/234712/5 "2015-03-24T17:10:44Z")
Hi Marcus, Thanks for the instant tips. One question. As I aware the latest bug free UHD package is uhd-master. Though my last build was related with uhd-master, since I have tried different ways of GNURadio and UHD installations (pybombs option, download-unzip-build option, debian download),\* I suspect a uhd version mismatch and thereby hindering the USRP transmission?\* (Please pardon me for my lack of knowledge in this field. And I am pretty sure that there should not be duplicate versions though). Hi Openbts, 1. Please address the issues specified in previous threads. 2. According to the link [1], once after OpenBTS build, should run, ln -s …/Transceiver52M/transceiver . whereas in another link [2], the executions are, ln -s …/TransceiverRAD1/transceiver . ln -s …/TransceiverRAD1/ezusb.ihx . ln -s …/TransceiverRAD1/fpga.rbf . Does this confuse the OpenBTS same as me? Does this have an impact on the issues given in 1)? Thanks. [1] [http://opensource.telkomspeedy.com/wiki/index.php/OpenBTS:\_N210\_Instalasi\_OpenBTS](http://opensource.telkomspeedy.com/wiki/index.php/OpenBTS:_N210_Instalasi_OpenBTS) [2] [https://wush.net/trac/rangepublic/wiki/BuildInstallRun](https://wush.net/trac/rangepublic/wiki/BuildInstallRun) On Tue, Mar 24, 2015 at 8:59 PM, Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)