2-32 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
10 TETRA Network Protocol 1 (TMO)
TETRA Network Protocol type 1 (TNP1) is a bridge protocol based on the TETRA layer 3 over the
air protocol and is therefore capable of supporting all TETRA dispatch functionality.
In TMO the TNP1 specifies a protocol to be used over the PEI that allows Terminal Equipment (TE2)
to have control over the TETRA services: mobility management, call control, short data service and
supplementary services. In addition there are commands to access the radio configuration and
storage parameters.
10.1 General
The terminal supports TETRA standard multi slot packet data using the IP network layer protocol.
Packet data applications will reside internally, over UDP, or in an external device connected to the 8
wire RS232 data port on the terminal. Communication to the external device is initialized using AT
commands.
10.2 Connectivity
The system provides point to point IP connectivity allowing the following datagram exchanges:
• Terminal <-> External Equipment (TE2) - PC etc.
• External Equipment (TE2) <-> Network (via Terminal)
The terminal supports IP version 4 and IP version 6 packets.
TNP1 services can use one of two PPP methods to connect from the TE to the MT, local mode, and
wide mode. TNP1 should be used in wide-mode wherever possible, so as to allow the parallel
operation of TNP1-SDS services and Packet date services over a common PPP link.
10.2.1 IP Addressing
10.2.1.1 Wide Mode
In this mode, all TNP1 services are available including packet data transfer towards the SwMI.
The address used is the dynamic address MS IP.
10.2.1.2 Local Mode
In this mode, all TNP1 services are available except packet data transfer. The address used are the
two static addresses TE IP: “10.0.0.100” and MT IP: “10.0.0.101”.
10.2.2 Port Addressing
The terminal uses a fixed port address for reception and transmission of TNP1 packets. The port
number is 4024.
10.3 Service and Feature Interactions
10.3.1 TXI Mode
TNP1 is available in local mode when TXI is enabled although all SDS messages will be blocked.
The terminal will drop the wide mode connection if TXI is entered, thus the PEI would go back to AT
mode. It is then up to the TNP1 client to detect this and reinitiate the PPP session in local mode
(This is the choice of the TNP1 client).
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