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Apollo pager In the United States, pagers typically receive signals using the FLEX protocol in the 900MHz band. Later pagers used digital messages, first numeric and later alphanumeric, to provide the recipient with more rmation. Other paging protocols used in the VHF, 400MHz UHF, and 900MHz bands include POCSAG and ERMES. This can result in pager messages being delayed or lost. It pre-dates mobile phone technology, being most popular during the 1980s and 1990s, but similarly uses radio transmissions to municate between a control/call center and the recipient. Other radio bands used for pagers include the 400MHz band, the VHF band, and the FM mercial broadcast band (88-108MHz). Early pagers only provided an audio notification, such as a series of bleeps, to indicate reception of a page. Apollo pager. 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. Older forms of message submission using the Telocator Alphanumeric input Protocol protocol involve modem connections directly to a paging work, and are less subject to these delays. 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. This is especially critical in hospital settings where emergency staff must be able to reliably receive pages in order to respond to patient needs. Pagers also have privacy advantages pared with cellular phones. 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. Many paging work operators now allow numeric and textual pages to be submitted to the paging works via email. |
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