DSD+ FL Connect +

[sonm10]

Drove quite away this last weekend to map out a DMR system. Most systems around me are capacity +. Easy to map out. Well, came out to be a mix of TIII, Con +, and Motorola Type II. I noticed the TIII channel numbers were not showing up for voice channels and the control channel was only spitting out channel numbers for the voice channel but not the control channel. Was a ? instead for TIII. Connect + showed nothing. TIII was using a common band plan, so a finally figured it out by calculating it out. However, the Connect + I could no determine the channel numbers at all. Connect + had no voice channels. Any suggestions for future reference? Capacity + is much easier to map out.

 

[mtindor]

Drove quite away this last weekend to map out a DMR system. Most systems around me are capacity +. Easy to map out. Well, came out to be a mix of TIII, Con +, and Motorola Type II. I noticed the TIII channel numbers were not showing up for voice channels and the control channel was only spitting out channel numbers for the voice channel but not the control channel. Was a ? instead for TIII. Connect + showed nothing. TIII was using a common band plan, so a finally figured it out by calculating it out. However, the Connect + I could no determine the channel numbers at all. Connect + had no voice channels. Any suggestions for future reference? Capacity + is much easier to map out.

IF you want to get the LCNs for a Connect Plus system, it's a matter of having to monitor the system when it is busy. If it's not busy, you just aren't giong to get the LCNs. You'll get a hint of what LCNs are in use by monitoring the CC, if there are any voice channels in use while you monitor. But if there is no activity you will get nothing.

And when the CC shows ? you have to end up waiting until there is voice traffic on the second timeslot of the CC before the ? will change to the proper LCN value.

So, to sum it up -- you have to listen when the site is active and is cycling through all of the voice channels.

Mike

 

[sonm10]

Thanks. 'fraid of that.

 

[slicerwizard]

The '?' for the control channel is there because the control channel doesn't announce its LCN/LSN. When a channel grant for the second timeslot is seen, then the LCN/LSN for the control channel is known.

Mapping these systems requires traffic. You match grants on the CC with concurrent active calls (with matching group/radio values) on traffic channels.