I suspect what we are seeing here is the patching of old and new radio systems. For example - Boston FD Channel 1 (483.1625R) is being patched to 800 Mhz Ch 81 and to 700 mhz Ch 71. Channel 71 is provisioned (set up / configured) to operate in P25 mode on the new Boston area 700 Mhz TRS. Channel 81 is set up to operate in analog mode on the MSP TRS primarily using Zone 1. The various channels (communications paths) are patched together via the fixed infrastructure (computer gear at the dispatch center or master controller).
The 800 Mhz channel can probably be set up to operate in either digital or analog mode. The same holds for 483.1625R. I suspect that the 700 Mhz talk groups can only operate in P25 mode. It might be useful to remember how a TRS operates. You hit the PTT on a portable radio. A data packet is sent to the master controller. The master controller assigns a channel pair to use. The master controller doesnt really care if traffic is analog or digital. And the master controller doesnt really care how many other comms paths are tied to any other comm paths. The master controller only cares that a channel pair is assigned when a PTT request is received. -- You received this message because you are subscribed to the Google Groups "massfire" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/massfire. For more options, visit https://groups.google.com/d/optout.
