OpenBSC March 2009

openbsc@lists.osmocom.org

9 participants
17 discussions

Wanted: A-bis and/or Um protocol traces for GPRS
by Harald Welte 12 Mar '09

12 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 10 Mar '09

10 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 04 Mar '09

04 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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Re: Jumper settings for 120 Ohm connection
by Dieter Spaar 01 Mar '09

01 Mar '09

Hello Holger, On Sat, 28 Feb 2009 11:53:23 +0100, "Holger Adams" <holger(a)kernreaktor.org> wrote: > > Maybe its important to mention: > - Both LEDs of the E-1 card are blinking red > - Used cables for the RJ45 plug (CAT5): orange/blue I can't help with Linux (I use Windows), however I noticed this in mISDN (hfc_multi.c) a while ago: case 1: /* HFC-E1 OEM */ /* 2 red blinking: NT mode deactivate * 2 red steady: TE mode deactivate * left green: L1 active * left red: frame sync, but no L1 * right green: L2 active */ So I would guess that there is a synchronisation problem which is not related to the TEI setting. Maybe there is something wrong with the wire connection. If you can see the signal sent from the E1 card at the BS-11 and there is also a signal sent from the BS-11, than probably the signal from the BS-11 is not received by the E1 card so it could not synchronize on it. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Jumper settings for 120 Ohm connection
by Holger Adams 01 Mar '09

01 Mar '09

Hello Everybody, I'm just trying to connect the E-1 host card to the BS-11, but I can't get it work. The serial connection works fine, I'm also seeing the "Abis-link: Restoring" message. My hardware configuration: 1) I removed the green jumpers TB01 - TB04 2) Jumper settings below the Twinax-board: 1-4 ON, 5-8 OFF 3) HFC-E1: NT Mode, Config A (all jumpers on the left side to the left) 4) 'hfcmulti' modprobed with 'dslot=1' 5) Forced the BS-11 to use correct TEI and E1 slot by using 'bs11_config' Have I missed something? I put a scope upon the rx/tx pins - traffic flows into both directions, so I think there's no collision (tx->tx, rx->rx) Thanks, Holger

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OpenBSC March 2009