Understanding Connect Plus trunking

[Forts]

Just saw your edits to the spacing above... I agree, that looks very promising! Perhaps we can get Ian to incorporate this into a new build. Do you think it would be worthwhile to have it added to the GUI if possible? ie.. If the program detects a Connect Plus system have it display the Network ID and Site # somewhere on the bottom row (to the right of the timeslot activity perhaps).

 

[inigo88]

I think that's a great idea!

And thanks for hearing me make my case. I just found another system frequency (I have 5 out of the 6 sites now) and all still checks out.

Here's Frequency vs. SLCO=10:

454.0375     000001110111000001000000
454.0500     000001110111000000010000
454.5250     000001110111000000110000
461.3000     000001110111000000100000
463.4375     000001110111000001010000

Now broken up into my suspected format:

454.0375     000001110111 00000 100 0000
454.0500     000001110111 00000 001 0000
454.5250     000001110111 00000 011 0000
461.3000     000001110111 00000 010 0000
463.4375     000001110111 00000 101 0000

Translation:

454.0375 - Network: 119 - Site: 4
454.0500 - Network: 119 - Site: 1
454.5250 - Network: 119 - Site: 3
461.3000 - Network: 119 - Site: 2
463.4375 - Network: 119 - Site: 5

Exciting!

 

[Forts]

Was out and about today and logged another Connect Plus system. Both the SLCO=9 & 10 showed this:

000101010100000000010000

Note the 0001 to start things off.... I think that pretty much confirms the first 12 bits to be the Network ID (with a maximum of 1111 1111 1111). The spacing around the Site ID could still vary, but I think we are reading the correct values there.

 

[wa6yvx]

Network ID's

Glad to see some progress. Forts, does this indicate that Network ID is 340?

 

[Forts]

That's the way I would read it, yes.

 

[inigo88]

That's the way I would read it, yes.

I concur!

For what it's worth, I've been copying and pasting in and out of this binary/decimal/hex conversion app. Helps a lot!

 

[Forts]

That's a handy page. Easier than trying to use Windows calculator, that's for sure.

 

[wa6yvx]

DMRDecode_41

Anyone know what changes have been made to the new release?

 

[inigo88]

He added decoding support for CSBKO=3 + FID=6 Channel Grants, and also recognizes CSBKO=1 + FID=6 as Connect Plus Control Channel system messages.

Speaking of Connect Plus, I finally have all six Fisher Wireless TeamTalk Connect sites figured out in the San Diego area (Network 119). Here they are!


454.0500 - Network: 119 - Site: 1
461.3000 - Network: 119 - Site: 2
454.5250 - Network: 119 - Site: 3
454.0375 - Network: 119 - Site: 4
463.4375 - Network: 119 - Site: 5
453.0125 - Newtork: 119 - Site: 6

I think they took 453.0125 off the air for a while but I picked it back up yesterday and was able to identify the site number.

 

[wa6yvx]

I also had 451.3250 and 454.1750 that had CC3. I'll check the site ID's when I hear them again to see if they are part of the same system. 453.0125 may be on a different site now, I can barely hear them.

 

[IanWraith]

Hi Folks
I have just uploaded build 42 to Github which adds decoding of the SLCO 10 messages. I couldn't test it as there are no Connect Plus systems around here so I would be grateful for reports of it working (or not).

My thanks to Inigo , Forts and everyone else for their work on this.

Regards

Ian

 

[Forts]

Looks good Ian, thanks very much!

 

[wa6yvx]

Looks great!, Network ID and Site ID display fine!

 

[IanWraith]

Looks great!, Network ID and Site ID display fine!

Thats good news. I will announce this new build properly tomorrow.

Thanks for your help.

Regards

Ian

 

[inigo88]

Great job Ian! Can't wait to try the new build!

 

[mam1081]

b42 SLCO decodes work for me too.

Sorry for the Capacity Plus posting on the first page. I did eventually find a Connect Plus near me (just no activity other than the Control Channel).

Devon Energy - Oklahoma City (downtown site) - 461.7250 - Network: 180, Site: 2

 

[wa6yvx]

Display from Log

7:44:42 PM DMR Data Frame
CACH : TACT AT=1 Ch 2 Last fragment of LC
Slot Type : Colour Code 3 Idle
7:44:42 PM Short LC : Connect Plus Control Channel SLCO=10 Network: 119 Site: 3
7:44:42 PM DMR Data Frame
CACH : TACT AT=1 Ch 2 Continuation fragment of LC
Slot Type : Colour Code 3 Idle
7:44:42 PM DMR Data Frame
CACH : TACT Ch 1 First fragment of LC
Slot Type : Colour Code 3 CSBK
Connect Plus CSBK : CSBKO=1
System Message : 0000000100000010000001000000010100000110000000000000000000001001
7:44:42 PM DMR Data Frame

 

[mikewazowski]

I can verify that the System ID and Site ID are both displaying correctly.

 

[IanWraith]

I can verify that the System ID and Site ID are both displaying correctly.

Brilliant. Its good to have a confirmation.

Thanks

Ian

 

[wa6yvx]

Voice Channel Data

Ian, while monitoring a voice channel, I logged this display. Does the Network ID (1110111 = 119) and Site ID only show up on the control channel?

9:29:16 AM DMR Data Frame
CACH : TACT AT=1 Ch 1 Continuation fragment of LC
Slot Type : Colour Code 3 Idle
9:29:16 AM DMR Data Frame
CACH : TACT Ch 2 Last fragment of LC
Slot Type : Colour Code 3 Terminator with LC
Group Voice Channel User LC
Service Options : Non-emergency/No priority
Group Address : 11919499 Source Address : 11910000
9:29:16 AM Short LC : Connect Plus Voice Channel SLCO=9 000001110111000000110000