| <?xml version="1.0"?> |
| <block> |
| <name>TRX Interface</name> |
| <key>grgsm_trx_interface</key> |
| <import>import grgsm</import> |
| <make>grgsm.trx($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 interface for external applications. |
| |
| There are three UDP sockets: CLCK, CTRL and DATA. |
| Give a base port B (5700 by default), the SCH clock |
| interface is at port P=B. The TRX-side control interface |
| is on port P=B+100+1 and the data interface is on an odd |
| numbered port P=B+100+2. |
| |
| Indications on the SCH Clock Interface (CLCK) |
| The SCH clock interface is output only (from the radio). |
| CLOCK gives the current value of the BTS clock to |
| be used by external applications. The indications are |
| sent whenever a transmission packet arrives that is too |
| late or too early. |
| |
| Commands on Control Interface (CTRL) |
| The control interface uses a command-response protocol. |
| Commands are NULL-terminated ASCII strings. Each command |
| has a corresponding response. This interface isn't handled |
| by this particular block, and should be implemented outside. |
| |
| Messages on the Data Interface |
| Messages on the data interface carry one radio burst per |
| UDP message. |
| |
| Received Data Burst: |
| 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" |
| |
| Transmit Data Burst: |
| 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> |