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A paging system alerts a pager (or group of pagers) by transmitting information over an RF channel, including an address and message information. This information is formatted using a paging protocol, such as 2-tone, 5/6-tone, GOLAY, POCSAG, FLEX, ERMES, or NTT. Two-way pagers and response pagers typically use the ReFLEX protocol. [29]
In most systems, the radio's receive audio would latch on if normally muted. In systems using a combination of audible tone sequences and CTCSS, it is common practice to turn off the CTCSS encode while the two-tone sequence is sent. This means system users with CTCSS decoders do not have to listen to the paging tones.
In The Netherlands the emergency services use the Flex-protocol in the nationwide P2000 network for pagers. The traffic on this network can be monitored online. [1]In South Australia the State's SAGRN network for the Emergency Services paging system (CFS, SES, MFS and SAAS) is run on the FLEX 1600 protocol, and can be monitored online.
Instead the system includes a separate paging controller connected to a trunk port of the telephone system. The paging controller is accessed as either a designated directory number or central office line. In many modern systems, the paging function is integrated into the telephone system, so the system can send announcements to the phone speakers.
Founded by Taiwanese businessman Hsu Ching-kuang (許清光) in October 1995, Gold Apollo produces POCSAG/FLEX pager. Initially, the company only produced numeric pagers and focused on the domestic market. However, in 1999, when Taiwan's Chunghwa Telecom announced it would no longer issue pager numbers, the pager market collapsed overnight. In ...
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In the UK, most pager transmissions are in five bands at 26 MHz (local pagers, mainly hospital systems, POCSAG and voice) 49 MHz; 138 MHz; 153 to 153.5 MHz; 454 MHz; The frequency 466.075 MHz was previously used by Hutchison Paging, but the network was shut down in 2000. The frequency is still reserved for paging but is not used.
The popularity of fire sirens took off by the 1920s, with many manufacturers including the Federal Electric Company and Decot Machine Works creating their own sirens. Since the 1970s, many communities have since deactivated their fire sirens as pagers became available for fire department use. Some sirens still remain as a backup to pager systems.