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APCO P-25 Primary Control Channels

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N9JIG

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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?
 

wlmr

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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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