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Direct Mode Operation (DMO)
Direct communications between two or more radios without the use of any infrastructure.
DMO
Direct Mode Operation
DTE
Data Radio Equipment
DTMF
Dual Tone Multi-Frequency
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)
DGNA is a possibility to provision talkgroups into the radio over the Air Interface.
See also:
Talkgroup
on page 66
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.
Encryption
The manipulation of a packet's data in order to prevent anyone but the intended recipient from reading that data.
There are many types of data encryption, and they are the basis of network security.
ESI
Encrypted Short Identity
ESSC
EMEA System Support Center
ETSI
European Telecommunications Standards Institute
European Telecommunications Standards Institute (ETSI)
The European standards organization responsible for the TETRA standard.
Glossary | 59
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