Direct Mode Operation (DMO) provides the ability for
TETRA radio terminals to communicate directly with each independent of the
TETRA network infrastructure. DMO is not new and has been a facility mandated
and used by many traditional PMR user organizations for several decades. The
primary requirement for DMO has been brought about by the need to balance the
RF Coverage, Grade of Service (GoS) and Reliability of a network with that of the
network’s overall cost. The requirement for DMO makes the use of public
cellular networks unsuitable.
As well as allowing direct communications in situations
where network coverage is not available, DMO also includes the possibility of
using a sequence of one or more TETRA terminals as relays. This functionality
is called DMO gateway (from DMO to TMO) or DMO repeater (from DMO to DMO). In
emergency situations this feature allows direct communications underground or
in areas of bad coverage.
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