The three-digit telephone number "9-1-1" has been designated as the "Universal Emergency Number" for citizens throughout the United States to request emergency assistance. It is intended as a nationwide telephone number and gives the public fast and easy access to a Public Safety Answering Point (PSAP). In July of 1979 the single number emergency system was implemented. 911 became the number to dial to reach county and city police, medic, and fire.
On November 24, 1987, Enhanced 911 was installed.
How it works
This enabled the 911 operator to receive a screen that gave the location and telephone number of the telephone from which the call was placed. The name that the phone was registered to, the correct medic unit, fire department, police department and city were shown on the screen also, this was a great advancement for Communications and the public.
Benefit to Public
With Enhanced 911 even when 911 received a hang up call, the 911 operator could still see the location of where the call was placed. The police were then able to respond to make sure that everything was okay at that location. Many lives have been saved by this technology. The phone system for the next nine years was a push button system. The operator had to physically push a button to answer the 911 call or transfer a caller to another number.
First Police Radios installed
In 1930 the first police radios were placed in the police vehicles. The radios were one-way radios. Dispatchers could talk to the officers but the officers could not respond back. By 1933 there were eight police cars in the department. Before the implementation of the police radios, officers were required to check in each hour with the station. Using call boxes that were placed on the streets, the officer’s would call headquarters and receive the calls that were in their assigned area.
After two-way radios were created the department installed them in the vehicles.
Two-way radios were a 450 MgHz. Radio. The static level was very high and dead spots abounded.