I'm writing multichannel p25 recorder. It mostly works (thanks to op25 team and other contributors). Is there any open documentation on control channel messages, especially TSBK frames? I did trellis decoding and CRC algorithm (reverse engineered the later, as I couldn't find parameters). I understand structure of some messages, for example "Group Voice Channel Grant Update" (opcode 02, manufacturer id 00), but many opcodes remain unknown. Do you have any leads on this?
Also, I'm not very familiar with gnuradio, is there way to place some kind of "gate" in flowgraph so some parts of it can be switched on/off by external event? I want to use such feature to gate voice channels on/off and do not waste processor cycles on filtering channels that do not carry traffic at the moment.
Best regards, Dmitry
There is a valve block that works like a switch. There is also a stream selector block that can switch one or more inputs to one or more outputs.
You can find the stream selector block here
https://github.com/guruofquality/grextras/wiki#wiki-list-of-blocks-in-this-p...
On 7/31/2012 3:09 AM, Dmitry Medvedev wrote:
I'm writing multichannel p25 recorder. It mostly works (thanks to op25 team and other contributors). Is there any open documentation on control channel messages, especially TSBK frames? I did trellis decoding and CRC algorithm (reverse engineered the later, as I couldn't find parameters). I understand structure of some messages, for example "Group Voice Channel Grant Update" (opcode 02, manufacturer id 00), but many opcodes remain unknown. Do you have any leads on this? Also, I'm not very familiar with gnuradio, is there way to place some kind of "gate" in flowgraph so some parts of it can be switched on/off by external event? I want to use such feature to gate voice channels on/off and do not waste processor cycles on filtering channels that do not carry traffic at the moment.
Best regards, Dmitry
Mossmans wireshark plugin and other code in the repo can handle TSBKs fine.
I'm keen to see this working. Do you have a webpage that details this project or do you have the code available anywhere?
Cheers, Matt
I'm writing multichannel p25 recorder. It mostly works (thanks to op25 team and other contributors). Is there any open documentation on control channel messages, especially TSBK frames?
I too would be interested in this project :)
Jay
To: op25-dev@yahoogroups.com
Mossmans wireshark plugin and other code in the repo can handle TSBKs fine.
I'm keen to see this working. Do you have a webpage that details this project or do you have the code available anywhere?
Cheers, Matt
I'm writing multichannel p25 recorder. It mostly works (thanks to op25 team and other contributors). Is there any open documentation on control channel messages, especially TSBK frames?
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Dmitry Medvedev -
Jay Bray -
Matt -
Stephen