Paging is a method of transmitting a message through a public or private communication system or radio signal that does not know its exact location. As a rule, users are taken to a small paging receiver that displays a numeric or letter message displayed on an electronic readout, or it can be sent and received as a voice message or other data.
The commercial paging service was launched in 1949 with a frequency distribution dedicated to one-time gesture services. Customers used OM receivers, listened to an operator announce their number, and then called the service to receive their message. Elective addressing (the ability to select an individual pager from the group) was introduced in the mid-1950s and the first use of the MM was done in an experimental paging system in the 1960s. Pagers with alphanumeric displays made their debut in the early 1990's. In addition to the complete messages that can be sent and stored in these pagers, a number of other services, such as stock market and sports score reporting, have been developed.
There are 4 main types of messaging services offered by Paging Systems: Tone, Numeric, Text (Alpha), and Voice. Two types of paging systems can provide these messaging services: one-way and two-way paging. A one-way paging system only allows pagers to send messages from the system. The two-way paging system allows the pager to confirm and respond to a message via the pager.
One-way paging is a process where paging messages (signals) are sent from a radio tower to a return verification signal on a pager. In its simplest form, a one-dimensional paging system can serve several hundred thousand digit paging customers.
The two-way paging system allows the paging device to recognize and sometimes respond to messages sent through a nearby paging tower. The low-power transmitter of two passenger pagers requires many receiving antennas to be located close together to receive a low-power signal.
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