[op25-dev] Re: Control channel questions

Andrew Porrett wap@ica.net [op25-dev] op25-dev at yahoogroups.com
Tue May 9 12:04:30 UTC 2017


At 07:33 AM 09-05-2017, gnorbury at bondcar.com [op25-dev] wrote:
>
>
>Suppose it depends at what point in time you start counting messages 
>being exchanged.  If the radio is already turned on and affiliated 
>then there will be a single request and grant exchanged, otherwise 
>there will be more messages.

Fairly hard for a turned off radio to PTT.  Radios register and 
affiliate as soon as they're turned on and dialed to a trunk 
talkgroup.  So PTT --> request --> grants.


>That said, from the perspective of someone passively monitoring the 
>control channel for the purposes of listening to the chatter, mostly 
>all they care about seeing is the grant and end messages.

The mythical end messages.  Again, how would subscribers on a voice 
channel see an end message on the control channel?

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