PUMA T2
Technical Handbook
General information
Page 14 OTE Proprietary information
P/N: 779-0306/01
Revision 03
1.6 PRIORITY GROUP SCANNING
Priority group scanning (PGS) is a mechanism by which a radio unit is
programmed to simultaneously attach to a list of talk group identities, by assigning
each of them a priority (on a per-user basis) to be used for incoming call
management.
1.6.1 Class of Usage (CoU) Priorities
The class of usage (CoU) value (priority) is generated by the radio unit user and
defines the scan priority associated to a priority group scanning list.
CoU values define the scanning priority of the talk groups. The radio unit user sets
appropriate CoU values by means of a “CoU updating” utility that can be disabled
during radio unit set-up (by default enabled). All the group identities and CoU
values of the scanning list are attached by the radio unit as a single message and
forwarded to the system. This procedure is carried out whenever a new list is
defined or the PGS mechanism is activated.
1.6.2 Scanning Algorithm
Within the TETRA system, the priority group scanning (PGS) algorithm is
implemented on the radio unit and therefore group call implementation (by the
system) can be applied even where PGS has been instigated on a radio unit.
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