libosmo-abis.git branch master updated. 0.3.2-38-g0c7d5f4

gitosis at osmocom.org gitosis at osmocom.org
Wed Nov 2 09:23:16 UTC 2016


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http://cgit.osmocom.org/libosmo-abis/commit/?id=0c7d5f4a61cc7897a6a8092cd3e0872a39cc98f1

commit 0c7d5f4a61cc7897a6a8092cd3e0872a39cc98f1
Author: Philipp <pmaier at sysmocom.de>
Date:   Wed Oct 19 18:38:58 2016 +0200

    lapd: adding support for ericsson's lapd dialect
    
    Ericsson's RBS2111-BTS (and similar) implements a lapdm dialect which uses
    a link establishment method that differs from the standard. While the BSC
    is transmitting sabm frames on one specific timeslot, the BTS will
    periodically scan through all timeslots to check for incoming sabm frames.
    When the BTS detcts the sabm fames on one of the timeslots it will stay
    there and continue to commence the link establishment.
    
    The described procedure requires a slightly modified lapd profile, the t200
    retransmission timeout has to be configured to exactly 300 msek. Otherwise
    the link establishment will fail. Since the BTS will switch from timeslot
    to timeslot most of the sabm frames will not be seen by the BTS, so the
    maximum retransmission has to be increased. This patch suggests a maximum
    retry count of 300, which is an educated guess and has worked fine during
    our tests.
    
    Change-Id: I892af57013d7ab4216e9e2d0873a69129aaeb8e5

-----------------------------------------------------------------------

Summary of changes:
 include/osmocom/abis/lapd.h |  9 +++++++++
 src/input/lapd.c            | 28 ++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)


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Osmocom A-bis protcol interface library



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