On the county's 800mhz radio system, it switches and LOCKS the radio onto the "emergency" channel (The lock can only be released by the dispatcher). It also transmits the radio's ID to Dispatch.
The county has 2 different systems. 1 is with the 800mhz system, and the other is part of the MDT/MDC system. Same system is used by both PD and FD.
On the MDC- same thing.... sends the unit number to dispatch.
All officers who are issued portables have their radios "assigned" to them in the dispatch system, so the ID comes up as "Capt05." If Portables are assigned to a vehicle and kept in a vehicle.... same thing. If the portable is a "unassigned" portable, it comes up as "port05XX"
I'm not 100% sure of the county policy on this, but I know that my sqaud had a crazy guy get loose in the back of the truck. the medic hit the panic button, and PD and FD Chief were made aware, and found the crew struggling with the patient along the road to the ED.
Part of it is common sense... if the radio used to call for help is assigned to an incident... if no response, all the cops in the area will go in on the call, and you will have enough beat-down power to go after a SWAT team
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If the station has no calls, and there is a distress call from a portable, the station will usually get a call, and whoever is OIC at present will speak with fireboard, and try to figure out who's button got hit, and where they are.
Along the lines of the correctional officer who hit their button and had the SWAT team show up..... Very likely, they had the officer on camera, and sent the team to her post, where she was on camera, assuming, until proving otherwise, that there was something that she needed backup for.
At my work, we have silent alarms at many of the desks. Policy is that the dispatcher will bring the desk up on camera, and call the officer, and ask yes/no questions as to what is going on. An officer is also sent to investigate.
If, on camera, any weapon is seen... the officer will not go in, and it wil likely escalate to a police matter. If there is no weapon seen, the officer will check the post and assist the officer who hit the alarm. The responding officer should be made aware of anything seen on camera.... as to fight, argurment, etc.
I know that if I ever need to use this, I WILL GET HELP. I also know that my dispatchers will not intentionally send me into a situation where I have an armed intruder.
Jon