Osmocom Libraries » libosmo-abis

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= libosmo-abis =

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

The library source code can be found in

{{{

git clone git://git.osmocom.org/libosmo-abis.git

}}}

== Input Drivers ==

There are currently the following input drivers available:

=== 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 signaling 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 signaling by module parameters, e.g.

{{{

modprobe hfcmulti dslot=1

}}}

will configure TS1 as signaling.

=== 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 signaling, e.g. bh

{{{

modprobe hfcmulti dslot=-1

}}}

(notice the "-" in front of 1 to indicate "no signaling timeslot").

=== 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.

=== ipa ===

This implements the ip.access A-bis/IP multiplex protocol.

=== hsl ===

Experimental driver for support of the [HSL_Femto]