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Direct Mode Operation (DMO)
communications between two or more radios
without the use of any infrastructure.
Downlink
The radio frequency
communications path from the BTS to the radio.
Also referred to as the BTS transmit path.
Dual-Tone Multi-Frequency (DTMF)
Tone-based signaling scheme which combines
two of a set of standard frequencies. The result
is a third or beat frequency (signal) which is the
desired or usable signal. DTMF signaling is used
as tone-dialing in the common telephone.
Dynamic Group Number Assignment
(DGNA)
Dynamic Group Number Assignment
is the possibility to provision talkgroups into the
radio over the Air Interface.
See also:
Encryption
Secure communications systems
are designed to provide coded (encrypted)
signals between some or all links in the system.
In order to do this, each device involved in
secure communications is loaded with a multi-
digit encryption variable (called a key). This key
is used by an encryption algorithm built into the
device to encrypt voice or data as needed. Only
devices in the system with the same algorithm
and encryption key can decode the encrypted
signals.
European Telecommunications
Standards Institute (ETSI)
independent, not-for-profit, standardization
organization in the telecommunications industry
(equipment makers and network operators) in
Europe, with worldwide projection. European
Telecommunications Standards Institute
produces globally-applicable standards for
Information and Communications Technologies
(ICT), including fixed, mobile, radio, converged,
broadcast, and internet technologies.
Firmware
Computer instructions that reside
as read-only software on the flash memory of a
radio.
Flash
A storage chip integrated in to radio
hardware, that can be erased and
reprogrammed.
Direct
Flashing
radio.
Group Call
multigroups.
See also:
Group Cipher Key (GCK)
cipher key used to provide confidentiality in
Class 3 system with corresponding algorithm.
Used to generate Modified Group Cipher Key
(MGCK).
See also:
Group Short Subscriber Identity
(GSSI)
ID or Talkgroup ID.
See also:
Home Location Address
coverage of a base station or group of base
stations within which a radio is allowed to
operate.
See also:
Individual Short Subscriber Identity
(ISSI)
specific radio within a specific DIMETRA/TETRA
system. Devices which are provisioned in
different systems can have the same Individual
Short Subscriber Identity. To provide a globally
unique identifier for a DIMETRA/TETRA device,
the Mobile Country Code (MCC) and Mobile
Network Code (MNC) of the device's home
An
system are used to create the device's Individual
TETRA Subscriber Identifier (ITSI).
See also:
Individual Tetra Subscriber Identity
(ITSI)
Identity (ISSI) plus Mobile Country Code (MCC)
and Mobile Network Code (MNC) codes.
See also:
Key
particular cryptographic algorithm, allows
unencrypted information to be encrypted and
encrypted information to be decrypted.
See also:
Writing a software image file to a
A call addressed to talkgroups or
TETRA term, in DIMETRA called Group
A unique, individual ID that refers to a
Consists of Individual Short Subscriber
A piece of data, which when used with a
MN004527A01-AG
Downlink
Predetermined
Area within radio
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