Alpine pager Common paging protocols include Telocator Alphanumeric input Protocol (TAP), FLEX, ReFLEX, POCSAG, Golay and NTT. Pagers remain in use to notify part-time emergency personnel. In this use, they can be thought of as a modern equivalent of maroon rockets. The paged party then had to telephone the control/call centre to collect the message either from an operator or an early voice mail device. In this use, they can be thought of as a modern equivalent of maroon rockets. Alpine pager. Later pagers used digital messages, first numeric and later alphanumeric, to provide the recipient with more rmation. Many paging operators also support WCTP for sending and receiving messages from 1.5, 1.7 and two-way pagers. Commercial paging transmitters typically radiate 1000 watts of effective power, resulting in a much wider coverage area per tower than a mobile phone transmitter, which typically radiates in the neighborhood of 0.6 Watt per channel. This can result in pager messages being delayed or lost. Alpine pager. Alpine pager
For this reason, older forms of message submission retain their usefulness for disseminating highly-important alerts to users such as emergency services personnel. In this use, they can be thought of as a modern equivalent of maroon rockets. Many paging operators also support WCTP for sending and receiving messages from 1.5, 1.7 and two-way pagers. 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). 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. Pagers using the mercial FM band receive a subcarrier, called the Subsidiary Communications Authority, of a broadcast station. |
