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== Configuring OsmTRX
OsmoTRX will read the configuration at startup time and configure the
transceiver accordingly after validating the configuration.
OsmoTRX can handle several TRX channels, but at least one must be configured in
order to be able to start it successfully. Channels must be present in the
configuration file in incremental order, starting from 0 and be consecutive.
Example configuration files for different devices and setups can be found in
`doc/examples/` in 'osmo-trx' git repository.
=== Documented example
.Example: Static GGSN/APN configuration (single catch-all GGSN)
----
trx
bind-ip 127.0.0.1 <1>
remote-ip 127.0.0.1 <2>
base-port 5700 <3>
egprs disable <4>
tx-sps 4 <5>
rx-sps 4 <6>
chan 0 <7>
tx-path BAND1 <8>
rx-path LNAW <9>
----
<1> Configure the local IP address at the TRX used for the connection against `osmo-bts-trx`.
<2> Specify the IP address of `osmo-bts-trx` to connect to.
<3> Specify the reference base UDP port to use for communication.
<4> Don't enable EDGE support.
<5> Use 4 TX samples per symbol. This is device specific.
<6> Use 4 RX samples per symbol. This is device specific.
<7> Configure the first channel. As no other channels are specified, `osmo-trx` assumes it is using only one channel.
<8> Configure the device to use `BAND1` Tx antenna path from all the available ones (device specific).
<9> Configure the device to use `LNAW` Rx antenna path from all the available ones (device specific).
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