2-52 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
15 GPS Support
The terminal is equipped with a GPS receiver with which enables it to ascertain its own location.
The terminal provides Location Reports in various circumstances:
• On request;
• Triggered by specific events (e.g. status transmissions, emergency, power on/off);
• At specified time intervals;
• At specified distance intervals.
The reports are sent using a protocol which is based on existing standards, using SDS as a
transport layer. SDS User Defined Data Type 4 and the customer can provision the terminal to either
use SDS-TL (for added reliability) or no SDS-TL (for saving air interface resources). The TETRA
standard Protocol Identifiers for GPS will be used - 3 for simple GPS (no SDS-TL) or 131 if SDS-TL
is used.
The location data are stored in the non-volatile memory of the terminal, for later retrieval.
If the terminal is provisioned to provide user indications, the user is notified of the feature’s
operational status.
If the terminal is provisioned with to provide the terminal user with position information, the user will
be able to view the terminal’s position and the status of the satellites that are in view.
The GPS feature can be enabled or disabled as a whole by the CPS. Also, the parameters of the
feature can be configured by the CPS, or over the air. CPS configuration provides a default profile,
which can be overridden by commands received over the air. The profile assigned to the terminal
will determine when to send location data, what data to send with what accuracy and to what
address to send the data.
All data requests and configuration commands received over the air are checked to confirm they
have come from a trusted source. Only ISSIs in a specified range may send location commands.
Note: Both the terminal and application receiving location messages from the terminal have to be
configured with the same protocol ID otherwise the terminal will report a failure when requested to
send an Immediate Location Report for example.
16 MMI Features
16.1 Dialing Modes
The terminals have a separate dialing mode for each type of call. In order to make a call, the user
switches to the appropriate mode, and makes the call. The dialing modes are:
• Group Mode
• Private Mode
• Phone Mode
• PABX Mode
If the terminal is provisioned as auto-mode-switch operation, when an incoming call is received the
terminal will automatically switch to the appropriate mode. If the terminal is not provisioned for auto-
mode-switch, when an incoming call is received, the terminal will alert the user, and the user must
manually switch to the appropriate mode to answer the call.
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