Security Services 2-33
September 2008
Chapter 2 - MTM800 Product Information Manual 6866537D87-F
10.3.2 DMO Mode
The terminal disables the TNP1 session while in DMO.
10.3.3 SDS and Packet Data
TNP1 implementation allows SDS and Packet Data transmission simultaneously.
10.3.4 AT commands
AT commands are used to initiate the PPP service in order for TNP1 to operate. Once the PPP
session is running all AT commands are blocked. When the PPP session is closed then AT
commands are available to the programmer.
11 Security Services
The terminals are able to provide TETRA security features as required in TMO.
TETRA provides the following 4 Levels of Protection:
11.1 Terminal Equipment Identifier (TEI)
This is a unique identity programmed into the terminal at the factory and cannot be subsequently
modified. It is write on the terminal‘s label and can be displayed in the CPS after reading the
terminal. The Terminal Equipment Identifier TEI will be used for the Authentication and Encryption
features.
Benefits:
❏ As TEI is unique for each terminal and is not editable, it prevents duplication of terminals in
the system.
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