See also: Talkgroup
Group Cipher Key (GCK) Predetermined cipher key used to provide confidentiality in Class 3 system with
corresponding algorithm. Used to generate MGCK.
See also: Modified Group Cipher Key, Class 3
Group Short Subscriber Identity (GSSI) TETRA term, in Dimetra called Group ID or Talkgroup ID.
See also: Short Subscriber Identity
GSSI Group Short Subscriber Identity
Home Location Address Area within radio coverage of a base station or group of base stations within which a
radio is allowed to operate.
See also: Base Station
Individual Short Subscriber Identity (ISSI) TETRA term for a unique, individual ID assigned for each
radio.
See also: Short Subscriber Identity
Individual TETRA Subscriber Identity (ITSI) Consists of ISSI plus MCC and MNC codes.
See also: Individual Short Subscriber Identity, Mobile Country Code, Mobile Network Code
ISSI Individual Short Subscriber Identity
ITSI Individual TETRA Subscriber Identity
Key Each device involved in secure communications is loaded with a multi-digit encryption variable ? an encryption key.
An encryption algorithm built into the device uses this key to encrypt voice or data as needed. Only devices in the system
with the same algorithm and encryption key can decode the encrypted signals.
See also: Encryption
LIP Location Information Protocol
Local Site Trunking (LST) Allows radio subscribers of the same cell site to communicate when the link between
the site and network central controller fails. Entering and exiting Local Site Trunking (that is, returning to Site Wide
Trunking) is done automatically ? the display shows the ?Local Area Service? message Any call in progress is dropped
upon entering Local Site Trunking mode. Registration, Group Call, and Emergency Call are available in Local Site
Trunking.
See also: Central Network Equipment
Location Request/Response Protocol (LRPP) This protocol allows for a single and efficient format of
passing location information (requests and responses).
LRPP Location Request/Response Protocol
LST Local Site Trunking
MACE Motorola Advanced Crypto Engine
Main Control Channel (MCCH) The main control channel at a site. The channel is used by radios to register on
the system and to request and setup speech calls with other radios.
See also: Control Channel
Glossary | 101
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