[[abis]] == Abis/IP Interface === A-bis Operation & Maintenance Link The GSM Operation & Maintenance Link (OML) is specified in 3GPP TS 12.21 and is used between a GSM Base-Transceiver-Station (BTS) and a GSM Base-Station-Controller (BSC). The default TCP port for OML is __3002__. The connection will be opened from the BTS to the BSC. Abis OML is only specified over E1 interfaces. The Abis/IP implementation of OsmoBTS and OsmoBSC extend and/or deviate from the TS 12.21 specification in several ways. Please see the _OsmoBTS Abis Protocol Specification_ <> for more information. === A-bis Radio Signalling Link The GSM Radio Signalling Link (RSL) is specified in 3GPP TS 08.58 and is used between a GSM Base-Transceiver-Station and a GSM Base-Station-Controller (BSC). The default TCP port for RSL is __3003__. The connection will be opened from the BTS to BSC after it has been instructed by the BSC. Abis RSL is only specified over E1 interfaces. The Abis/IP implementation of OsmoBTS and OsmoBSC extend and/or deviate from the TS 08.58 specification in several ways. Please see the _OsmoBTS Abis Protocol Specification_ <> for more information. === Locate Abis/IP based BTS We can use a tool called abisip-find to be able to find BTS which is connected in the network. This tool is located in the OsmoBSC project repository under: './src/ipaccess' ==== abisip-find abisip-find is a small command line tool which is used to search and find BTS devices in your network (e.g. sysmoBTS, nanoBTS). It uses broadcast packets of the UDP variant of the Abis-IP protocol on port 3006, and thus will find any BTS that can be reached by the all-network broadcast address 255.255.255.255 When program is started it will print one line for each BTS it can find. .Example: using abisip-find to find BTS in your network ---- $ ./abisip-find abisip-find (C) 2009 by Harald Welte This is FREE SOFTWARE with ABSOLUTELY NO WARRANTY you might need to specify the outgoing network interface, e.g. ``abisip-find eth0`` Trying to find ip.access BTS by broadcast UDP... MAC_Address='24:62:78:01:02:03' IP_Address='192.168.0.171' Serial_Number='123' Unit_ID='sysmoBTS 1002' MAC_Address='24:62:78:04:05:06' IP_Address='192.168.0.182' Serial_Number='456' Unit_ID='sysmoBTS 1002' MAC Address='00:01:02:03:04:05' IP Address='192.168.100.123' Unit ID='65535/0/0' Location_1='' Location 2='BTS_NBT131G' Equipment Version='165a029_55' Software Version='168a302_v142b13d0' Unit Name='nbts-00-02-95-00-4E-B3' Serial Number='00123456' ^C ---- You may have to start the program as a root: ---- $ sudo ./abisip-find eth0 ---- === Deploying a new nanoBTS A tool called ipaccess-config can be used to configure a new ip.access nanoBTS. ==== ipaccess-config This program is very helpful tool which is used to configure Unit ID and Primary OML IP. You can find this tool in the OsmoBSC repository under: './src/ipaccess' .Example: using ipaccess-config to configure Unit ID and Primary OML IP of nanoBTS ---- $ ./ipaccess-config -u 1801/0/0<1> 10.9.1.195<2> -o 10.9.1.154<3> ipaccess-config (C) 2009-2010 by Harald Welte and others This is FREE SOFTWARE with ABSOLUTELY NO WARRANTY Trying to connect to ip.access BTS ... abis_nm.c:316 OC=SITE-MANAGER(00) INST=(ff,ff,ff) STATE CHG: OP_STATE=Disabled AVAIL=Not installed(07) abis_nm.c:316 OC=BTS(01) INST=(00,ff,ff) STATE CHG: OP_STATE=Disabled AVAIL=Not installed(07) ADM=Locked abis_nm.c:316 OC=BASEBAND-TRANSCEIVER(04) INST=(00,00,ff) STATE CHG: OP_STATE=Disabled AVAIL=Not installed(07) ADM=Locked OML link established using TRX 0 setting Unit ID to '1801/0/0' setting primary OML link IP to '10.9.1.154' abis_nm.c:316 OC=CHANNEL(03) INST=(00,00,00) STATE CHG: OP_STATE=Disabled AVAIL=Not installed(07) ADM=Locked ... abis_nm.c:2433 OC=BASEBAND-TRANSCEIVER(04) INST=(00,00,ff) IPACCESS(0xf0): SET NVATTR ACK Set the NV Attributes. ---- <1> Unit ID <2> IP address of the NITB <3> IP address of the nanoBTS