A typical chester county dispatch follows the following format,
1st: A tone (1 beep designates a medical call on the EMS and Fire side of things, or a priority call on the Police Side of things, 2 beeps designates a fire call on the EMS and Fire side of things, 3 beeps designates a "recall" or call being cancelled on the Fire and EMS side)
2nd: Units due (ex, Station 25 for fire calls, or MICU 25-1 for EMS)
3rd: Address ( ex, 123 Main St, cross streets of 1st and 2nd street)
4th: Call Type (ex, Fire Alarm, Falls, Chest Pain, etc)
5th (fire calls only): Box Number (Boxes are the old way of segmenting up a geographical "response territory" for an agency and assigning it a number, ex box 2502, would be Station 25's 2nd box. These boxes are still relevant today as high priority/hazard areas such as schools, attractions that would require a specialized response. Ex, Station 25 is Longwood Fire Company, they provide service to Longwood Gardens, so Longwood gardens would have it's geographic area assigned it's own "box", and when dispatchers see a call in that "box" they know to use a certain parameter of units for that call.
For type of units:
MICU - An ambulance that has ALS(advanced life support) capabilities
MEDIC - Typically an ALS chase car such as an explorer that responds in addition to an ambulance to provide ALS services
AMBLUANCE - A transport capable EMS vehicle
ENGINE - Primary has water and hose for fires
RESCUE - Has rescue tools and NOT always water, though some do
TANKER - Large apparatus with lots of water
TAC - A smaller version of an engine/rescue
BRUSH - A small version of an engine for brush fires
SQUAD - A pickup truck or other transport vehicle
UTILITY - A pickup truck or other transport vehicle
TRAFFIC - A pickup truck or other transport vehicle with traffic control devices onboard
