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)
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
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
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
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
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
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
