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Question about talkgroups

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i’ve noticed a pattern where, for example, TG numbering: 100, 102, and 104 appear to increase in even-numbered increments. I’m curious—why does this happen?”
 

MTS2000des

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In the old days of SmartNet, can't recall but even/odd had something to do with priority monitor markers sent on the low speed data on voice channels, so if you used priority monitor on your system, you could not assign one or the other (been over 10 years since our SN .89x was up). My guess is a lot of P25 system fleet mapping was "copy and paste" from legacy system fleet maps so there is another possibility.
 

Whiskey3JMC

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i’ve noticed a pattern where, for example, TG numbering: 100, 102, and 104 appear to increase in even-numbered increments. I’m curious—why does this happen?”
Have you tried turning on ID search to see if any odd numbered talkgroups pop up? Just curious...
 

KevinC

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In the old days of SmartNet, can't recall but even/odd had something to do with priority monitor markers sent on the low speed data on voice channels, so if you used priority monitor on your system, you could not assign one or the other (been over 10 years since our SN .89x was up). My guess is a lot of P25 system fleet mapping was "copy and paste" from legacy system fleet maps so there is another possibility.
It was odds only for priority monitor.
 

GTR8000

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It was odds only for priority monitor.
I wasn't aware of that, but it answers the question of why the NJ statewide system talkgroups were all odd numbered until just recently. All of the legacy talkgroups were migrated over from the now-defunct SmartZone OmniLink system, and so that pattern continued for many years until they finally started creating even numbered talkgroups on the ASTRO 25 system.
 

KevinC

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I wasn't aware of that, but it answers the question of why the NJ statewide system talkgroups were all odd numbered until just recently. All of the legacy talkgroups were migrated over from the now-defunct SmartZone OmniLink system, and so that pattern continued for many years until they finally started creating even numbered talkgroups on the ASTRO 25 system.
And when the local/regional system migrated to 9600 they kept up the odds only and also didn't use hex, so they ran out of TG's pretty quickly once they started adding tons of agencies. :ROFLMAO:
 
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