News pager service The slower POCSAG on-air protocol is still used for some pagers in the United States and probably in other countries. 2 way pager service
Other paging protocols used in the VHF, 400MHz UHF, and 900MHz bands include POCSAG and ERMES. In this use, they can be thought of as a modern equivalent of maroon rockets. Other radio bands used for pagers include the 400MHz band, the VHF band, and the FM mercial broadcast band (88-108MHz). News pager service. Motorola bravo 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. This can result in pager messages being delayed or lost. Note that the idiomatic sound heard in popular media (movies and television programs) as "pager going off" (a series of two short beeps interrupted by a slightly longer pause) is actually the "pager power-up verification beep" sequence, perhaps because it was easier to generate that tone on demand (simply flip the power switch on). All text is available under the terms of the GNU Free Documentation License. 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. Many paging operators also support WCTP for sending and receiving messages from 1.5, 1.7 and two-way pagers. For this reason, older forms of message submission retain their usefulness for disseminating highly-important alerts to users such as emergency services personnel. News pager service. In this use, they can be thought of as a modern equivalent of maroon rockets. Pagers remain in use to notify part-time emergency personnel. 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. Past paging protocols include Two-tone and 5/6-tone. |
