OpenBSC

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3 participants
4274 discussions

BTS connections
by Eric Cathelinaud 24 Mar '09

24 Mar '09

Hello everybody, I would like to know whether it would be possible to obtain some information about the cable connection. It is written on the website that the Y03 and Y04 PCM are left open, but I can see on the photo http://bs11-abis.gnumonks.org/trac/attachment/wiki/BS11_Configuration/bs11_… that there is a twinax cable between them. Am I wrong? If not, I would like to know what's the use of this connection. Thanks a lot Eric

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Re: Problems with bs11_config ('BS11 DELETE OBJECT NACK') and bsc_hack
by Dieter Spaar 24 Mar '09

24 Mar '09

Hello Holger, On Thu, 19 Mar 2009 17:25:15 +0100, "Holger Adams" <holger(a)kernreaktor.org> wrote: > > I remember that one TRX wasn't ('No Load') loaded. Phase 3 was reached. If this is the first one, it won't work because this is the one OpenBSC uses in the moment. If it is not loaded you should switch off and on the BS-11 and check if it works afterwards. On my BS-11 there seems to be a temperature related problem which sometimes requires quite a few restarts to get the first TRX loaded. Additionally it could be that an attached RS232 cable disturbs the startup process. All of the above is not 100% sure because its difficult to reproduce, but maybe it helps to load the first TRX (if the second TRX is not loaded this should be no problem to get OpenBSC running). Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: Problems with bs11_config ('BS11 DELETE OBJECT NACK') and bsc_hack
by Dieter Spaar 23 Mar '09

23 Mar '09

Hello Holger, On Mon, 23 Mar 2009 09:13:00 +0100 (CET), "Holger Adams" <holger(a)kernreaktor.org> wrote: > > There are still some problems of getting the TRX started (sorry for keep > bugging, but it doesn't make real fun to start developing without a > working fundament). I don't see a problem with the traces, what you receive is the "Channel Load" Indication from the BS-11, OpenBSC advices the BS-11 to send this report. > I except of beeing 'DoSed' by various mobilephones lying around here, but > nothing happens. I also can't see the 'OpenBSC-Test' provider on my > mobilephones (manual network select). A phone normally won't register to the test network as long as it reaches the network stored on the SIM. You should see the network "001-01" if you manually search for a network (it could also be "Test01" or similar), but not the name 'OpenBSC-Test'. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: Problems with bs11_config ('BS11 DELETE OBJECT NACK') and bsc_hack
by Dieter Spaar 20 Mar '09

20 Mar '09

Hello Holger, On Thu, 19 Mar 2009 14:32:48 +0100 (CET), "Holger Adams" <holger(a)kernreaktor.org> wrote: > > The programm stucks at 'TX TEI(1): 10 1a 1e 06 0b 00 0b 06 1e 00 01 00 f1 > 10 00 01 28 ff' but continues playing LAPD-RR-Pingpong. Should I try to > reflash the firmware? I also tried restarting 'openbsc' a few times. > Does bs11_config show that both TRX are loaded and that the BS-11 is in Phase 3 ? Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: Problems with bs11_config ('BS11 DELETE OBJECT NACK') and bsc_hack
by Dieter Spaar 20 Mar '09

20 Mar '09

Hello Holger, On Thu, 19 Mar 2009 11:02:05 +0100 (CET), "Holger Adams" <holger(a)kernreaktor.org> wrote: > > Sniffed Abis-Link (with K1103): > http://www.kernreaktor.org/stuff/bs11-e1.txt I am not familiar with the K1103. But if I don't misunderstand the traces, everything should be fine. After the database has been sent to the BS-11, you won't see any additional traffic on the E1 interface as long as there is no phone registering to the BS-11 or you advice OpenBSC to send something to the BS-11. You should now be able to see the network with a phone. If you want to generate some E1 traffic without a phone, you can press (or release) the instrusion switch, this should result in a report sent from the BS-11. However I don't know how long the delay is between actually changing the switch state and the resulting report. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Wanted: A-bis and/or Um protocol traces for GPRS
by Harald Welte 13 Mar '09

13 Mar '09

Hi! As one of our following steps in OpenBSC will be work on GPRS support, I would be interested in any GPRS related protocol traces of the A-bis interface or the Um interface. Particularly interesting obviosuly is the registration and session setup/teardown. So if anyone has such traces for GPRS, please don't hesitate to contact me. The traces will not be publicized but just used as a reference and example for the further development of OpenBSC. Thanks in advance! (yes, I'm still on holidays, but rather wrote that email immediately than to put it on a TODO list and loose time and/or forget about it) -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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E1 interface, layer 2
by Klaus-Peter Junghanns 11 Mar '09

11 Mar '09

Hi, i am staring at the sources right now, figuring out how openbsc uses which part of misdn to send/receive frames over the e1 link. I think it's doing something like this (please correct me if i am wrong: - use timeslot 1 in hdlc mode for the signalling link - use misdns layer 2 to handle the TEI assignment, etc What i am wondering about is: - which ETSI standard describs layer 2 for GSM abis? Thanks a lot in advance for your feedback. :-) Mit freundlichen Grüßen -- best regards Klaus-Peter Junghanns -- Junghanns.NET Gesellschaft fuer Internet-Services & Software-Development mbH Breite Str. 13a 12167 Berlin Germany Geschaeftsfuehrer : Klaus-Peter Junghanns Eingetragen beim Amtsgericht Charlottenburg, HRB 79169 Finanzamt fuer Koerperschaften III, Steuernummer 29/409/8978 Umsatzsteuernummer : DE 217621658 WEEE-Reg.-Nr. DE 86102730

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Re: E1 interface, layer 2
by Dieter Spaar 11 Mar '09

11 Mar '09

Hello, On Tue, 10 Mar 2009 15:24:00 +0100, "Klaus-Peter Junghanns" <kpj(a)junghanns.net> wrote: > > What i am wondering about is: > - which ETSI standard describs layer 2 for GSM abis? As far as I am aware, its LAPD as specified by ITU Q.920 and Q.921 (very similar if not equal to what is used in the "D"-channel of ISDN). Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Racal 6103 ?
by Dieter Spaar 08 Mar '09

08 Mar '09

Hello, does anyone has access to a Racal 6103 ? I have bought a used one and have some questions. Please drop me a note, private email is fine. Thank you very much. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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BS-11, bs11_config
by Klaus-Peter Junghanns 05 Mar '09

05 Mar '09

Hello everybody, finally i found some time to unwrap my precious BS-11 and started playing. Unfortuantely i did not get to far... I managed to build the power cable, install the antenna, hook up the serial cable to a debian box and install the openbsc software. I followed the steps in the wiki, e.g. run "bs11_config -p /dev/ttyS0" and then turn on the BS-11. The green power LED on the BS-11 is solid green. But i do not get any output from the bs11_config (e.g. no booting messages, etc). :-( Sometimes bs11_config segfaults when i switch on the power to the BS-11: bs11_config -p /dev/ttyS0 bs11_config (C) 2009 by Harald Welte and Dieter Spaar This is FREE SOFTWARE with ABSOLUTELY NO WARRANTY Invalid length in hdr: 0 Segmentation fault The serial cable is connected to the serial port (1 of 4) which is closest to the antenna connectors (like i have seen it on the photo). What did i do wrong? Thanks in advance for your help. :-) Mit freundlichen Grüßen -- best regards Klaus-Peter Junghanns -- Junghanns.NET Gesellschaft fuer Internet-Services & Software-Development mbH Breite Str. 13a 12167 Berlin Germany Geschaeftsfuehrer : Klaus-Peter Junghanns Eingetragen beim Amtsgericht Charlottenburg, HRB 79169 Finanzamt fuer Koerperschaften III, Steuernummer 29/409/8978 Umsatzsteuernummer : DE 217621658 WEEE-Reg.-Nr. DE 86102730

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