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TETRA: It is optimized for high population density areas, with spectral efficiency (4 time slots in 25kHz: four communications channels per 25kHz channel, an efficient use of spectrum). It is suitable for high population density areas and supports full duplex voice, data and messaging. but, it is generally unavailable for simulcast, VHF band - however particular vendors have introduced Simulcast and VHF into their TETRA platform.. Integrated Communication System used by various departments under government of Delhi and Delhi police since 2010. When the FRT threshold is breached, the MS is in a situation where it is essential to relinquish (or abandon) the serving cell and obtain another of at least usable quality. That is to say, the mobile station is aware that the radio signal is decaying rapidly, and must cell reselect rapidly, before communications are terminated because of radio link failure. When the mobile station radio-signal breaches the minimum receive level, the radio is no longer in a position to maintain acceptable communications for the user, and the radio link is broken. DAMM chosen to provide communication for GAIL pipeline in India. Damm.dk (2011-07-12). Retrieved on 2013-07-16. Polizia di Stato (Italian state police), Carabinieri (military police), Guardia di Finanza (financial police), Polizia Penitenziaria (prison police), and Corpo Forestale Italiano (Italian forest brigades)

Tetra Tower

Being used by several Mining Operations throughout Western Australia and Queensland - Terminals only - No Infrastructure.

The much lower frequency used gives longer range, which in turn permits very high levels of geographic coverage with a smaller number of transmitters, thus cutting infrastructure costs.

Tetra Tower™

Service acquisition provides a means of virtually personalising the end user to any given radio terminal and onto TETRA network for the duration the end user conserves the terminal under his possession. The second reason we should heed their concerns has to do with a fundamental aspect of the impact of this radiation on our bodies. The key statement to understand is this: that the effects of microwave radiation on tissue are cumulative. That is to say, getting a low-level dose of microwaves constantly over many years, is the equivalent (as far as your body is concerned) of getting that same dose in one short high-level burst. Governments and scientists have known this fact for over 60 years, ever since the first microwave masts went up for the military communications. The engineers performing maintencance on those early masts had a very strong tendency to go blind within the first year of doing their work on those masts. In effect their eyeballs had been slowly cooked by their exposure to the microwaves of the masts they were maintaining. It was these early experiences of the military engineers with this technology that has led to our understanding today that the effects of microwaves on tissue accumulate. Ambulance, army, Central Office for Administrative and Electronic Public Services, Civil Defence, Hungarian Prison Service, Hungarian Customs and Finance Guard, disaster management, fire, Hungarian Secret Services, Ministry of Environment and Water, and policeGovernment - ambulance and emergency services, police, healthcare facilities, utility services, St. Petersburg Authorities and the regional civil defense This of course raises the obvious question, and unfortunately there is no happy answer. Even 3 miles is certainly not a sufficient distance to allow undisturbed sleep. And on the UK mainland, the odds are that 90% of the population are living within 2 miles of at least 2 or 3 Tetra Masts. DAMM deployed for regional network in North West Russia. Damm.dk (2011-08-22). Retrieved on 2013-07-16. A single slot consists of 255 usable symbols, the remaining time is used up with synchronisation sequences and turning on/off, etc. A single frame consists of 4 slots, and a multiframe (whose duration is 1.02 seconds) consists of 18 frames. Hyperframes also exist, but are mostly used for providing synchronisation to encryption algorithms. This transport application tool-kit has been produced successfully and with TETRA communication technology and assures for the public transport application requirements for the future mentioned hereafter.