Technical Council on Lifeline Earthquake Engineering of ASCE
The technology of using radio frequencies to communicate is not new. Ham radio and walkie talkies were the first form of radio communication used by the public; then the Citizen Band (CB) radio followed. Extensive use of radio communications is made by commercial users, such as taxi cabs and delivery trucks and by emergency service organizations, such as police and fire services. All of these systems allow individual users to communicate with a base station, or directly with other individuals that are operating on compatible frequencies. A user on one of these systems primarily communicates with its base station. The telecommunications industry expanded on the concept and established a wireless network which works with the existing PSN. The medium used between the subscriber and the CO is high frequency radio signals. Signals are transmitted and received through an array of antennas, so that a user has access to the system over a very large area. The equivalent of the COs in the wireless system are also connected to the PSN so that the subscribers of the two systems can communicate with each other. This chapter examines the organization and operation of the wireless system.
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