I could be wrong, but I believe all NCC units monitor N-Disp (FIRE), and when a call comes in, the switch to N-TAC3. If there is an active incident on N-TAC3, then they would be instructed by fireboard to switch to N-TAC4, or 5 and so on...
I believe EMS monitor N-EMSOP1 and conduct their business there.
Hope that helps.
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