Libosmo-abis » History » Revision 8
Revision 7 (laforge, 11/11/2019 04:12 PM) → Revision 8/12 (laforge, 03/04/2020 08:35 PM)
h1. libosmo-abis
{{>toc}}
h2. General description
This is a library containing common/shared code regarding the A-bis interface between BTS and BSC.
It implements drivers for mISDN and DAHDI based E1 cards, as well as some A-bis/IP dialects.
h2. Preconditions
To compile libosmo-abis you will need the following tools:
<pre>
sudo apt-get install build-essential libtool libortp-dev dahdi-source libsctp-dev shtool autoconf automake git-core pkg-config make gcc
</pre>
h2. Obtaining it
To obtain libosmo-abis, you can use the following git URL:
<pre>
git clone git://git.osmocom.org/libosmo-abis.git
</pre>
h2. Compiling and installing it
To compile and install it as standalone:
<pre>
cd libosmo-abis/
autoreconf -i
./configure
make
sudo make install
sudo ldconfig -i
cd ..
</pre>
h2. Licensing
This library is GPL licensed. This means you *cannot use this library from non-GPL licensed code without infringing copyright!
h2. Browsing its source code
You can do that using our cgit installation at http://cgit.osmocom.org/libosmo-abis/
h2. Input Drivers
There are currently the following input drivers available:
h3. misdn
This input driver supports the mISDN code as it is present in mainline linux-2.6 kernels.
It uses the in-kernel LAPD implementation, and is thus bound to some restrictions. Specifically,
you can only have one signalling timeslot (D-channel) in every E1 line, which may cause problems
with multi-BTS or multi-TRX setups (particularly in the case of Nokia A-bis)
You have to configure which E1 timeslot is to be used for signalling by module parameters, e.g.
<pre>
modprobe hfcmulti dslot=1
</pre>
will configure TS1 as signalling.
h3. misdn_lapd
This input driver supports the mISDN code as it is present in mainline linux-2.6 kernels.
However, unlike the "misdn" driver, it runs LAPD in userspace, as part of libosmo-abis.
In order to be able to use it, you will need to make sure the mISDN kernel driver does not
configure any timeslot to signalling, e.g.
<pre>
modprobe hfcmulti dslot=-1
</pre>
(notice the "-" in front of 1 to indicate "no signalling timeslot").
h3. dahdi
This driver supports the DAHDI (formerly known as zaptel) out-of-tree drivers for e.g.
the various Digium and Digium compatible E1/T1/J1 cards.
h3. ipa
This implements A-bis over IP, as implemented by ip.access nanoBTS as well as all BTSs running [[OsmoBTS:]].
h3. hsl
Experimental driver for support of the [HSL_Femto]
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