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Terrestrial Trunked Radio (TETRA)

This is something I think wearable developers should be aware of.

http://www.tetramou.com/

>Terrestrial Trunked Radio ( TETRA ) is an open digital trunked
>radio standard defined by the European 
>Telecommunications Standards Institute (ETSI)
>
>The TETRA Memorandum of Understanding ( MoU )
>represents 60 organisations from 19 countries.

>TETRA in relation to other standards: 
>
>GSM, DECT and TETRA should be regarded as complementary 
>standards. Where GSM is the wireless extension of
>the digital telephone network, TETRA is the wireless 
>extension of Integrated Services Private Branch Exchanges.
>Whereas the GSM and DECT systems were specifically 
>designed for mobile radio telephone communication,
>TETRA will cover the needs that GSM cannot fulfil. Some 
>of the most obvious examples are:
>
>                     •  Broadcast Call
>                     •  Group Call
>                     •  Priority Call
>                     •  Open Channel
>                     •  Direct Mobile to Mobile Communication without any
infrastructure
>                     •  Mobile used as a Repeater
>                     •  Fast Call Set-up (0.3 sec.)
>
>TETRA offers the same benefits as found in many public 
>cellular systems such as multi-site coverage, cellular
>organisation, automatic location, roaming, advanced 
>software design, etc. and will provide a cost effective means to
>transmit voice and data information to remote units in 
>the mobile and fixed operational area of an organisation or a
>company. 

Gaute

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