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42 | Services and Features
The feature is configurable using the CPS.
Subscriber Class
When the radio powers up, or whenever it performs registration or roaming, it always uses its provisioned Subscriber
Class (SC).
When the radio registers on a cell that does not support any of its SCs, it is active only in services that have the
emergency priority.
Whenever the radio SC does not match the cell SC (the feature is configurable using the CPS), it either uses normal
ranking procedures (see section
Subscriber Class by Talkgroup
The Subscriber Class by Talkgroup feature forces all the radios attached to the same talkgroup to have the same
Subscriber Class.
The Subscriber Class by Group feature helps to avoid issues as presented in the following scenarios:
•
Preserving traffic channel capacity. For two cells having the same coverage and placed together to multiply traffic
capacity a number of radios is attached to Talkgroup 1 on the first cell and only one radio is attached to Talkgroup
1 on the second cell. A group call uses two traffic channels (one on the first cell and one on the second). In this
scenario, multiplying traffic capacity would not work without the feature. However, as radios on the same
talkgroup are forced (by Subscriber Class mismatch) to roam to one cell, all the radios should use only the first
cell.
•
Spreading radios population across cells and prohibit them from roaming. Many radios used on a small area with
multiple BTS coverage causes huge roaming traffic. A congestion occurs and as a result you would not be able to
communicate. However with the feature, radios do not roam to a cell with mismatched Subscriber Class, what
stops the roaming traffic.
A radio Subscriber Class changes when the user changes between talkgroups which are assigned to another
Subscriber Class.
Up to 16 Subscriber Classes can be configured (in the CPS) and talkgroups assigned to them. The assignment is
carried out by talkgroup GSSI or by folder (except Favorite) which the talkgroup was chosen from.
Talkgroup may be assigned to more than one Subscriber Class (either by folder or Talkgroup range). The first
assigned Subscriber Class is used. Upon receiving Subscriber Class from the SwMI radios change their Subscriber
Class to the received one. The Subscriber Class received from the SwMI over the air has always higher priority than
Subscriber Class by Group. If a radio already uses the same Subscriber Class as the one received from the SwMI, the
current Subscriber Class is not changed. On powering on, the radio is set to the default Subscriber Class or Subscriber
Class assigned to an attached talkgroup.
Favorite folders cannot be assigned to any Subscriber Class.
Super Groups are treated as scanned groups and Subscriber Class by Talkgroup feature does not apply to them.
Subscriber Class by Talkgroup is a selling feature.
Local Site Trunking
Local Site Trunking (LST) is a feature enabling a base station to operate stand-alone. The base station may enter the
mode when the link from the local cell to the central switch has gone down. The radio limits functionality when the
cell is in this mode.
Note: Whether a radio can register on cells in LST depends on the codeplug settings.
If system broadcasts indicate that system-wide services are not available (LST) on a cell, the radio registers on this
cell only if there are no system-wide cells available.
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Call Roaming on page
39), or does not roam to the cell at all.
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