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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.
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 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.
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 ...
A P2000 pager. P2000 is a one-way communications network for pagers based on Motorola's FLEX-protocol in the Netherlands. The network is used by all emergency services and provides nationwide coverage. Several tests have shown the network can cope with the largest disasters when large numbers of emergency personnel need to be reached.
During the 1990s, ERMES aimed to achieve a standardised digital platform throughout Europe. [4] [5] [6] It was intended that paging systems based on the ERMES standard would be able to receive text messages transmitted from personal computers, enabling companies to contact their employees over the PSTN.
A paging system makes efficient decisions on which memory to relegate to secondary storage, leading to the best use of the installed RAM. In addition the operating system may provide services to programs that envision a larger memory, such as files that can grow beyond the limit of installed RAM.
The (h,k)-paging problem is a generalization of the model of paging problem: Let h,k be positive integers such that . We measure the performance of an algorithm with cache of size h ≤ k {\displaystyle h\leq k} relative to the theoretically optimal page replacement algorithm .
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