F E A T U R E G U I D E
5. FEATURE GUIDE
Feature overview
Based on the Airbus Defence and Space TETRA i-range platform, the TDM880i contains a lot of functionality
common to this product family. This document focuses on the new features and major feature changes introduced
in the TDM880i product. Thus the common TETRA features are not described in depth here.
The main new features of the TDM880i are:
• Tracking capability of the location history (see Section Tracking and positioning on page 17)
• Configurable low power consumption mode with time and periodical capabilities - the sleep mode (see Section
• Controlled periodic reset powers the device off and re-starts it within a configurable period (see Section Periodic
• Possibility to route GPS output as NMEA through the AT port (see Section NMEA output on page 18)
• Enhanced clock recovery after power failure (see Sections Time recovery on page 19 and Recovery from power
• Enhanced temperature protection by controlling the RF and extension chip powering in heating conditions (see
Section Temperature protection on page 19)
• Configurable group management with background scanning and the ability to use FACCH for messaging when
available (see Section Load management (group mana FACCH) on page 20)
• I/O line bound Alert condition management feature with configurable OTA notification and configuration options
(see Section Alert condition and notification feature on page 20)
• Ignition signal recognition and powering the radio ON/OFF accordingly (see Section Ignition sense (IGS )
Tracking and positioning
The TDM880i can be configured to send its location information periodically to the controller that needs to keep
track of the location history. When the TDM880i is in service, the location information is sent as SDS messages.
When the TDM880i is out of service and the GPS tracking functionality is enabled, the TDM880i stores the location
information in permanent memory until it is back in service again. The tracking information is then sent to the
controller as SDS messages.
The SW component that provides the tracking functionality in the TDM880i is called the GPS Tracking Server
(GTS).
Sleep mode
The sleep mode functionality adds a special
timed hibernation
possibility for the product. In general this means that
the product can be set to low-power consumption mode - for example sleep - for a specified amount of time. In this
mode, the device is aware of its internal clock and powering events, but has turned down all other external PEI / RF
interfaces.
When using this feature, the device can be configured to hibernate for a certain time or the time periods can be
defined when the device is operational and when it hibernates
It should be noted that the sleep mode itself does not include calendar functionality, and the given time parameters
are treated as absolute values of specified time units like minutes.
Note:
Due to the background nature of this feature, it should be noted that when this feature is configured
and activated, it takes partial control over the GPS circuit powering and in certain situations prevents the
powering down the GPS circuit. In cases where the power consumption should be turned to an absolute
minimum, or complete control of the GPS circuit is required, this feature should be turned off.
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