A paging system alerts a pager (or group of pagers) by transmitting information over an RF channel, including an address and message information. Additionally, organizations often integrate paging systems with their and systems, conceptually attaching pagers to a telephone extensions, and they set up to integrate pagers into other parts of their enterprise. Small paging systems, such as those used in restaurant and retail establishments, often integrate a keyboard and paging system into a single box, reducing both cost and complexity.Paging systems support several popular direct connection protocols, including, TNPP, and, as well as proprietary modem- and socket-based protocols.
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Automated monitoring and escalation software clients, often used in hospitals, IT departments, and alarm companies, tend to prefer direct connections because of the increased reliability. Paging systems also support various types of direct connection protocols, which sacrifice global addressing and accessibility for a dedicated communications link.
System operators often assign unique phone numbers or email addresses to pagers (and pre-defined groups of pagers), enabling clients to page by telephone call, e-mail, and SMS. In the mid-1990s, some paging companies began offering a service, which allowed a customer to call their pager-number, and have numeric messages read back to them. Because of this, if a one-way pager is turned off or is not receiving a usable signal at the time a message is transmitted, the message will not be received and the sender of the message will not be notified of this fact. Since one-way pagers do not contain transmitters, one-way paging networks have no way to track whether a message has been successfully delivered to a pager. This is especially critical in hospital settings where emergency staff must be able to reliably receive pages in order to respond to patient needs.Unlike mobile phones, most one-way pagers do not display any information about whether a signal is being received or about the strength of the received signal.
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Although 900 MHz FLEX paging networks tend to have stronger in-building coverage than mobile phone networks, commercial paging service providers will work with large institutions to install repeater equipment in the event that service is not available in needed areas of the subscribing institution's buildings. Commercial paging transmitters typically radiate 1000 of, resulting in a much wider coverage area per tower than a mobile phone transmitter, which typically radiates around 0.6 watts per channel.
In the United States, pagers typically receive signals using the in the 900 MHz band.
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