How are the 700MHz overlays proposed for D/FW, Austin, San Antonio, and Houston supposed to work? My assumption is that existing or proposed P25 systems will use 700 MHz overlays as linking systems and that mobiles, will generally, not operate directly on the overlays within their own coverage areas, rather, they will stay on their own frequencies unless they move outside their coverage area.
In other words, a unit within his own coverage area, say Irving, will switch to an "Interop" channel and the overlay will carry that traffic to other systems in the region. Am I on or off base here? Say an Irving mobile wants to talk to Plano, the Irving unit will switch to an interop channel and the 700 MHz overlay will handle the link to Plano. This works fine until that Irving unit is chasing somebody into Plano and the Irving freqs will no longer be accessible. What happens to the mobile unit? Does he switch directly to the 700 Mhz overlay while chasing? This would seem the logical choice.
Is there a technical discussion of how these overlays are supposed to work?
Thanks,
Russell
In other words, a unit within his own coverage area, say Irving, will switch to an "Interop" channel and the overlay will carry that traffic to other systems in the region. Am I on or off base here? Say an Irving mobile wants to talk to Plano, the Irving unit will switch to an interop channel and the 700 MHz overlay will handle the link to Plano. This works fine until that Irving unit is chasing somebody into Plano and the Irving freqs will no longer be accessible. What happens to the mobile unit? Does he switch directly to the 700 Mhz overlay while chasing? This would seem the logical choice.
Is there a technical discussion of how these overlays are supposed to work?
Thanks,
Russell