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M3SR Series 4100
SECOM-H supports two types of links:
•
Point-to-Point link (PtP):
Exactly 2 radios can communicate. The Station (STN) setting determines the radio which
is called.
•
Point-to-Multipoint link (PtM):
The Group (GRP) setting determines the group of radios which is called. The
BROADCAST_MP setting is a special group call, because it addresses all radios in a net.
During a broadcast call, LTE is enabled. LTE offers the chance to join a broadcast call
even if the initial link setup was missed or to re-connect to the link if the connection was
lost.
It is always possible to receive all link types. Therefore, the radio is temporarily
switched to the link type of the incoming call. It is necessary to select the destination
address manually if a specific net member shall be addressed.
4.8.1.5
Free Hopset Search
SECOM-H provides the Free Hopset Search (FHS) feature to improve communication qual-
ity for Point-to-Point links with difficult environmental conditions like fading channels or jam-
ming. Therefore, connection quality for all channels in a hopset (max. 20) is analyzed and
results in an Advanced Hopset (AHS) which contains only channels that provide suitable
quality for the selected communication mode. Further, the number of channels in an AHS can
be constrained (min/max) to guarantee TRANSEC. If FHS has found a sufficient number of
channels, the AHS is automatically enabled for subsequent communication. If no channel of
the hopset provides decent quality, only the best channel is picked for communication at the
cost of transmission security (reduced hopset). As soon as another destination address is
selected or a R&S RNMS3000 configurable time has expired, the AHS is deactivated.
R&S EK4100 Systems cannot improve communication quality by means of FHS.
4.160
Operating Manual 6175.4760.02 – 01
SECOM-H
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