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APCO P-25 Primary Control Channels

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Dec 14, 2001
Far NW Valley
Do P25 system sites have "Primary" Control Channels and "Alternate" Control Channels, or are all assigned Control Channels the same as far as the System itself is concerned?

While I have seen that most sites the control channel tends to stay on one channel all the time until there is a failure, does the system actually assign specific Control Channels as Primary or Alternate or are "Alternates" just Control Channels that are not used as such at the time?


Apr 26, 2004
It's a system setting for each site. There can be up to 4 control channels. They each can be assigned a priority level from 1 to 4. If they are set up 1,2,3,4 the priority 1 channel always is the control channel unless it fails. When it's repaired / back up, it automatically takes back the control channel from the #2 priority channel. Priority 3 and especially 4 only get the control channel if things get quite bad.
- also -
Sites can be set up with more than one channel as priority 1. (1,1,2,3 or other combinations) In that event, if the first control channel has a problem, it won't get the control channel back until / unless the other priority 1 channel(s) have troubles later down the line.

I guess you can refer to all the control channels higher up the priority ladder as alternates, although a co-priority 1 control channel that's waiting it's turn could also be considered alternate I suppose.
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