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66 | Glossary
Short Subscriber Identity (SSI)
The network specific portion of a TETRA Subscriber Identity. An SSI is only unique within one TETRA subdomain
(one TETRA network).
SIM
Subscriber Identity Module
Software Image
A collection of files distinguished by individual releases. It contains firmware, codeplug, and audio template files
dedicated to specific radio models.
SSI
Short Subscriber Identity
Static Cipher Key (SCK)
Key used for encryption between radios and BTS in Class 2 systems with corresponding algorithm.
See also:
Encryption
on page 59
Status ID
A feature that makes it possible for a subscriber to send status messages to other subscribers. The user can enter a
status message for each ID in a Status ID list. When a subscriber sends a status message, the ID of the subscriber?s
unit is sent along with the status message.
Subscriber Identity Module (SIM)
A smart card that holds subscriber information (including the authentication key) and is inserted into the radio to
grant its personality.
Switching and Management Infrastructure (SwMI)
All the system components excluding the mobile equipment that is the CNE and all the remote site equipment.
See also:
Central Network Equipment
SwMI
Switching and Management Infrastructure
Talkgroup
A group of radio users that can share calls and messages as a group. Normally a talkgroup is comprised of users who
have a need to communicate with each other on a day-to-day basis.
TEI
TETRA Equipment Identity
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on page 58
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