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Flex technical information
Flex Basic characteristics of the FLEX protocol and comparison with other protocols
FLEX is a family of protocols including both the protocols for one-way data transmission and protocols ReFLEX and InFLEXion designed for two way transmission of messages.
Main advantages of the FLEX standard over other standards are as follows:
The system's higher capacity and adaptability
More reliable message reception owing to degree of tolerance to interference and transmission interruprion (the admissible time of transmission interruption is 12 times greater than for the protocol POCSAG 2400). A high degree of tolerance to interference has come about through the use of error correction, checksums and message numbering.
Incresed pager battery life - 4-5 times longer than that of POCSAG pagers as a result of the synchronous mode of operation.
Possibility to increase speed of messages transmission without reprogramming pagers, which is inconvenient both for subscribers and operators.
The possibility of using POCSAG and FLEX pagers in one system simultaneously.
The possibility of roaming - message transmissions to other cities by operators using different frequencies.
World-wide distribution of the FLEX protocol
All 10 largest paging operators of the USA use the FLEX protocol.
These operators serve nearly 25 mln of 34.5 mln subscribers in he USA (72%).7 of 10 countries with the greatest number of subscribers have adopted FLEX. At present, as many as 88 percent of all paging suscribers in the world are users of the FLEX-based systems.
ReFLEX
The FLEX-family high speed paging protocol allowing to receive numeric and text messages and to send various information from the pager (confirmation of messages received, inquiry for the repeated message transmission on detection the missing ones as well, inquiries for the information and standard messages). With some models of pagers and paging network faximile and E-mail exchange is possible.
InFLEXion
The FLEX-family high speed paging protocol allowing to receive voice messages.
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