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TSMP, an acronym for Time Synchronized Mesh Protocol, was developed by Dust Networks as a communications protocol for self-organizing networks of wireless devices called motes. TSMP devices stay synchronized to each other and communicate in timeslots, similar to other TDM (time-division multiplexing) systems. Such deterministic communication allows the devices to stay extremely low power, as the radios only turn on for the periods of scheduled communication. The protocol is designed to operate very reliably in a noisy environment. It uses channel hopping to avoid interference -- the packets between TSMP devices get sent on different radio channels depending on time of transmission. Digi International has also developed a time synchronized mesh protocol called DigiMesh.

Dust Networks' underlying time synchronized mesh networking technology has been standardized by the HART Communications Foundation with the WirelessHART protocol, and the International Society of Automation ISA100 standard.

Time synchronized mesh networking is marketed for applications that require reliability and ultra long battery life, typically measured in years. It is intended for the industrial market for manufacturing process monitoring and control.

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