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<?xml version="1.0"?>
<block>
<name>TRX Burst Interface</name>
<key>grgsm_trx_burst_if</key>
<import>import grgsm</import>
<make>grgsm.trx_burst_if($remote_addr, $base_port)</make>
<param>
<name>base_port</name>
<key>base_port</key>
<value>5700</value>
<type>string</type>
</param>
<param>
<name>remote_addr</name>
<key>remote_addr</key>
<value>127.0.0.1</value>
<type>string</type>
</param>
<sink>
<name>bursts</name>
<type>message</type>
<optional>1</optional>
</sink>
<source>
<name>bursts</name>
<type>message</type>
<optional>1</optional>
</source>
<doc>
OsmoTRX like UDP burst interface for external applications.
There are two UDP connections, where each message carries
one radio burst with header. Give a base port B (5700 by default).
One connection at port P=B+100+2 is used for sending received bursts
to an external application. Another one at port P=B+2 is used to
obtain to be transmitted bursts.
Received burst format:
1 byte timeslot index
4 bytes GSM frame number, big endian
1 byte RSSI in -dBm
2 bytes correlator timing offset in 1/256 symbol steps,
2's-comp, big endian
148 bytes soft symbol estimates, 0 -> definite "0",
255 -> definite "1"
To be transmitted burst format:
1 byte timeslot index
4 bytes GSM frame number, big endian
1 byte transmit level wrt ARFCN max, -dB (attenuation)
148 bytes output symbol values, 0 & 1
</doc>
</block>
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