Figure 2: Trunked Mode Operation
2.3
Direct Mode Operation
Direct Mode Operation (DMO) is a mode of simplex operation where radios communicate directly
without the need of a network.
Figure 3: Direct Mode Operation
2.4
Numbering and Addressing
Each radio has an Individual TETRA Subscriber Identity (ITSI) used for addressing the radio over the
air interface.
However, it is undesirable to require you to enter a long number to address another radio. To this end,
a set of short number schemes can be used. Alternatively, the radio can be provisioned to treat a short
number as a Short Subscriber Identity (SSI). This scheme can be refined to allow short dialing within a
fleet by combining the ID entered with the radio own SSI.
If the radio is provisioned to treat a short number as a TETRA SSI, and the number entered is fewer
than seven digits, the identity of the radio is combined with the number entered to produce the actual
MN002955A01-AA
Chapter 2: Services and Features
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