• Table of contents
• libosmo-abis
  • Input Drivers
    • misdn
    • misdn_lapd
    • dahdi
    • ipa
    • hsl

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]