nd5y
Member
Are any of the various DMR or NXDN trunking protocols capable of overflow voice channels that are only used if all other channels are busy?
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DMR, NXDN overflow channels
- Thread starter nd5y
- Start date
mmckenna
I ♥ Ø
Not sure what you mean by "overflow". I've got 5 channels on my NXDN system and it rotates the control channel around, and the other 4 are available for voice traffic.
NexEdge can do a dual purpose control channel, where if the system busies out all the available voice paths, it can temporarily use the control channel for a voice call.
clbsquared
Member
If you aren’t getting a channel grant, it’s because all of the frequencies are in use. There would be no overflow.
nd5y
Member
Low priority voice channels that are never control channels or LTR home channels, and only used if the rest of the voice channels are busy. I think LTR called it overflow channels. Sometimes business systems did that to reduce interference on channels shared with nearby users. LTR and Motorola can do that. I don't know about DMR.
mmckenna
I ♥ Ø
Ah, OK.
I can set channels on my system to be voice, or voice and control. I set my lowest frequency to be voice only, and never control, it's also the one I use to send the Morse Code call sign.
I'm not aware of a way to do that on a Gen 1 NexEdge system, at least not as you describe, but it makes sense.
I can set channels on my system to be voice, or voice and control. I set my lowest frequency to be voice only, and never control, it's also the one I use to send the Morse Code call sign.
I'm not aware of a way to do that on a Gen 1 NexEdge system, at least not as you describe, but it makes sense.
Used to be that some channels would be reserved for interconnect calls and only during high loading would voice calls be routed there. But that's all ancient history now.
Motorola 3600 had DFB channels (Dynamic Frequency Blocking) where frequencies were shared amongst neighbor sites and dynamically assigned as needed.
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