Libosmo-abis » History » Revision 6
Revision 5 (fixeria, 09/25/2018 06:55 PM) → Revision 6/12 (fixeria, 09/25/2018 06:57 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. Source The library source code
To obtain libosmo-abis, you can use the following git URL: be found in:
<pre>
git clone git://git.osmocom.org/libosmo-abis.git
</pre>
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 the ip.access A-bis/IP multiplex protocol.
h3. hsl
Experimental driver for support of the [HSL_Femto]
