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Metrocall pager Even more recent models included the ability to send messages in a two-way fashion and even included the ability to send and receive email. Metrocall pager. Pager technology is now used in irrigation control systems and for traffic signals. All text is available under the terms of the GNU Free Documentation License. This is convenient for many users, due to the widespread adoption of email; but email-based message submission methods do not usually provide any way to ensure that messages have been received by the paging work. In the United States, pagers typically receive signals using the FLEX protocol in the 900MHz band. Some early models included an analog audio receiver and speaker; upon receiving a page the speaker would activate, and the user would hear a human voice reciting their message. Metrocall pager. Al one pager
Pager technology is now used in irrigation control systems and for traffic signals. The slower POCSAG on-air protocol is still used for some pagers in the United States and probably in other countries. Pagers usually have very simple ring tones and some include a vibrating alert. Thus, if a pager has nationwide service, a message sent to it could be intercepted by criminals or law enforcement agencies anywhere within the nationwide service area. On a smaller scale, pagers are sometimes carried by staff in medical establishments, allowing them to be summoned to emergencies. But this can also be a disadvantage, since a message sent to a pager must be broadcast from every paging transmitter in the pager's service area. Pagers using the mercial FM band receive a subcarrier, called the Subsidiary Communications Authority, of a broadcast station. Past paging protocols include Two-tone and 5/6-tone. |
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