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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 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.
If someone called the phone number, it never rang on an actual phone, but would be routed immediately to a central voicemail system. The voicemail system answered the call and the caller could leave a long, detailed message. As soon as the message was received, the voicemail system would trigger the citizen's pager.
Alexa-powered Echo devices can also make phone calls, either to numbers in your contact list (which can be imported into the Alexa app) or any number you ask Alexa to dial. One exception: 911.
The PPM is worn like a pager and detects hidden audio tones within a station or network's audio stream, logging each time it finds a signal. There are several parts to the PPM system: An encoder that inserts the tones subliminally into a station's or broadcast network's airchain via psychoacoustic masking.
As the use of alphanumeric pagers declined in the mid-1990s and cell phone text messaging availability and reliability increased ever since, these well-established alpha-dispatch call centers adjusted their technology to allow live operators' messages to be transmitted to cellular service providers in the same way as to pager service providers.
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