Wireless Communications, various telecommunications systems that use radio waves to carry signals
and messages across distances. Wireless communications systems include cellular telephones, pagers,
radio telegraphs, satellite telephones, laptop computers, personal digital assistants (PDAs), shortwave
radios, and two-way radios. They are used primarily to transmit private communications. Commercial radio
and television are also wireless telecommunications systems, but radio and television are mainly public
broadcast services rather than private communications systems (see Radio and Television Broadcasting).
This article focuses on wireless communications systems that are used primarily for private communications.
Wireless communications allow people greater flexibility while communicating,
because they do not need to remain at a fixed location, such as a home or office, but instead can communicate
with other people while traveling in a car or walking along a street. Wireless technologies make communications
services more readily available than traditional wire-based services (such as ordinary telephones), which require
the installation of wires in fixed locations. Wireless communications devices are useful in places where communications
services are only temporarily needed, such as at outdoor festivals or large sporting events. These technologies are also
useful for communicating in remote locations, such as mountains, jungles, or deserts, where wire-based telephone service might not exist. Police, fire, and other emergency departments use wireless devices, such as two-way radio, to communicate information between vehicles that are already responding to emergency calls. Construction and utility workers frequently use handheld radios for short-range communication and coordination. Many businesspeople use wireless devices, such as cellular radio telephones, also known as cell phones, to stay in contact with colleagues and clients while traveling. Increasingly, people are using wireless devices for a variety of everyday purposes.
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and messages across distances. Wireless communications systems include cellular telephones, pagers,
radio telegraphs, satellite telephones, laptop computers, personal digital assistants (PDAs), shortwave
radios, and two-way radios. They are used primarily to transmit private communications. Commercial radio
and television are also wireless telecommunications systems, but radio and television are mainly public
broadcast services rather than private communications systems (see Radio and Television Broadcasting).
This article focuses on wireless communications systems that are used primarily for private communications.
Wireless communications allow people greater flexibility while communicating,
because they do not need to remain at a fixed location, such as a home or office, but instead can communicate
with other people while traveling in a car or walking along a street. Wireless technologies make communications
services more readily available than traditional wire-based services (such as ordinary telephones), which require
the installation of wires in fixed locations. Wireless communications devices are useful in places where communications
services are only temporarily needed, such as at outdoor festivals or large sporting events. These technologies are also
useful for communicating in remote locations, such as mountains, jungles, or deserts, where wire-based telephone service might not exist. Police, fire, and other emergency departments use wireless devices, such as two-way radio, to communicate information between vehicles that are already responding to emergency calls. Construction and utility workers frequently use handheld radios for short-range communication and coordination. Many businesspeople use wireless devices, such as cellular radio telephones, also known as cell phones, to stay in contact with colleagues and clients while traveling. Increasingly, people are using wireless devices for a variety of everyday purposes.
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