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Numbering and Addressing
•
All its Software is deleted.
•
All its MMI interfaces on the terminal are disabled.
The Permanent Disable is recommended to be invoked when it has been determined that a terminal
is absolutely unrecoverable. When a terminal has been lost or stolen, the first step always is to stun
(Temporary Disable) the terminal.
Permanent Disable is recommended to be used in conjunction with the deletion of the user's Radio
Record in the UCS and the deletion of the K-Ref association of the disabled terminal in the PrC and
the AuC that lies within the cluster where the terminal's home zone is located. This ensures that
subscriber information is not downloaded into the HLR if a restore of the UCS is performed.
The system operator has to also ensure that the terminal's K-Ref association is also removed from
the other AuCs in the network, in cases where the K-Ref pairs are duplicated across the network.
Note that if this is not performed, the terminal could be assigned a new home zone that lies in a
cluster where the K-Ref association has not been deleted.
Benefits:
•
Immediate and complete disabling of the subscriber by the dispatcher via the air interface if
the terminal is not expected to be recovered.
12.6
High Assurance Boot (HAB)
The terminal has a facility that ensures that the code and data flashed in the terminal is authentic
and has not been altered. The HAB module is forced by hardware to run at boot time and check that
all software comes from a trusted source by checking the signature of the code and data segments
present in the terminal using a public/private key mechanism. The keys are downloaded using the
provisioning tool.
If HAB authentication of the flashed software fails, it will not allow the terminal software to run.
13
Numbering and Addressing
Each terminal has a TETRA ITSI which is used for addressing the terminal over the air interface.
However, it is undesirable to require the user to enter a long number to address another terminal. To
this end, a number of short number schemes can be used.
13.1
Short Addressing Schemes
Alternatively, the subscriber can be provisioned to treat a short number as an SSI. This scheme can
be refined to allow short dialing within a fleet by combining the ID entered with the terminal's own
SSI.
13.1.1
Short Number Dialing using ISSI
IMPORTANT:
If the terminal is provisioned to treat a short number as a TETRA Short Subscriber Identity, and the
number entered is less than 7 digits, the terminal's own identity will be combined with the number
entered by the user to produce the actual ISSI. Using this scheme, an ISSI can be comprised of a
fleet number part and a member part.
The terminal's own ISSI will be used as 'leading digits' for the digits omitted by the user. Thus, if for
instance:
March 2009
This feature is available only for the full keypad terminal.
Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual
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