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[[bts-examples]]
== OsmoBSC example configuration files
The `osmo-bsc/doc/examples/osmo-bsc` directory in the OpenBSC source
tree contains a collection of example configuration files, sorted by BTS
type.
This chapter is illustrating some excerpts from those examples
[[bts_example_nbts]]
=== Example configuration for OsmoBSC with one single-TRX nanoBTS
.OsmoBSC with one single-TRX nanoBTS
====
----
e1_input
e1_line 0 driver ipa <1>
network
network country code 1
mobile network code 1
short name OpenBSC
long name OpenBSC
auth policy closed
location updating reject cause 13
encryption a5 0
neci 1
rrlp mode none
mm info 1
handover 0
bts 0
type nanobts <2>
band DCS1800 <3>
cell_identity 0
location_area_code 1
training_sequence_code 7
base_station_id_code 63
ms max power 15
cell reselection hysteresis 4
rxlev access min 0
channel allocator ascending
rach tx integer 9
rach max transmission 7
ip.access unit_id 1801 0 <4>
oml ip.access stream_id 255 line 0
gprs mode none
trx 0
rf_locked 0
arfcn 871 <5>
nominal power 23
max_power_red 20 <6>
rsl e1 tei 0
timeslot 0
phys_chan_config CCCH+SDCCH4
timeslot 1
phys_chan_config SDCCH8
timeslot 2
phys_chan_config TCH/F
timeslot 3
phys_chan_config TCH/F
timeslot 4
phys_chan_config TCH/F
timeslot 5
phys_chan_config TCH/F
timeslot 6
phys_chan_config TCH/F
timeslot 7
phys_chan_config TCH/F
----
====
<1> You have to configure one virtual E1 line with the
IPA driver in order to use Abis/IP. One e1_line is
sufficient for any number of A-bis/IP BTSs, there is no
limit like in physical E1 lines.
<2> The BTS type must be set using `type nanobts`
<3> The GSM band must be set according to the BTS hardware.
<4> The IPA Unit ID parameter must be set to what has been configured on
the BTS side using the __BTS Manager__ or `ipaccess-config`.
<5> The ARFCN of the BTS.
<6> All known nanoBTS units have a nominal transmit power of 23 dBm. If
a `max_power_red` of 20 (dB) is configured, the resulting output
power at the BTS Tx port is 23 - 20 = 3 dBm.
[NOTE]
====
The `nominal_power` setting does __not__ influence the transmitted power
to the BTS! It is a setting by which the system administrator tells the
BSC about the nominal output power of the BTS. The BSC uses this as
basis for calculations.
====
[[bts_example_nbts_multi]]
=== Example configuration for OsmoBSC with multi-TRX nanoBTS
.OsmoBSC configured for dual-TRX (stacked) nanoBTS
====
----
e1_input
e1_line 0 driver ipa
network
network country code 1
mobile network code 1
short name OpenBSC
long name OpenBSC
auth policy closed
location updating reject cause 13
encryption a5 0
neci 1
rrlp mode none
mm info 0
handover 0
bts 0
type nanobts
band DCS1800
cell_identity 0
location_area_code 1
training_sequence_code 7
base_station_id_code 63
ms max power 15
cell reselection hysteresis 4
rxlev access min 0
channel allocator ascending
rach tx integer 9
rach max transmission 7
ip.access unit_id 1800 0 <1>
oml ip.access stream_id 255 line 0
gprs mode none
trx 0
rf_locked 0
arfcn 871
nominal power 23
max_power_red 0
rsl e1 tei 0
timeslot 0
phys_chan_config CCCH+SDCCH4
timeslot 1
phys_chan_config SDCCH8
timeslot 2
phys_chan_config TCH/F
timeslot 3
phys_chan_config TCH/F
timeslot 4
phys_chan_config TCH/F
timeslot 5
phys_chan_config TCH/F
timeslot 6
phys_chan_config TCH/F
timeslot 7
phys_chan_config TCH/F
trx 1
rf_locked 0
arfcn 873
nominal power 23
max_power_red 0
rsl e1 tei 0
timeslot 0
phys_chan_config SDCCH8
timeslot 1
phys_chan_config TCH/F
timeslot 2
phys_chan_config TCH/F
timeslot 3
phys_chan_config TCH/F
timeslot 4
phys_chan_config TCH/F
timeslot 5
phys_chan_config TCH/F
timeslot 6
phys_chan_config TCH/F
timeslot 7
phys_chan_config TCH/F
----
====
<1> In this example, the IPA Unit ID is specified as `1800 0`. Thus, the
first nanoBTS unit (`trx 0`) needs to be configured to 1800/0/0 and
the second nanoBTS unit (`trx 1`) needs to be configured to 1800/0/1.
You can configure the BTS unit IDs using the `ipaccess-config`
utility included in OpenBSC.
[NOTE]
====
For building a multi-TRX setup, you also need to connect the TIB cables
between the two nanoBTS units, as well as the coaxial/RF AUX cabling.
====
|
