Motorola MTM800 - 7.1.2 External SDS Application Support; 7.1.3 Downlink SDS Routing; 7.2 SDS Addressing.; 7.3 Status Messaging (Pre-defined)

2-22 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
The terminal can be programmed to always send the delivery report by using SDSTL-Report, even
if the originator requested a short report. It can also be programmed to support the old SDS-TL
standard for operation on both Dimetra - P and other SwMIs.
7.1.2 External SDS Application Support
An externally device connected via the terminal‘s PEI interface may access the terminals SDS
services, using the AT commands, to send and receive SDS status and SDS User Defined Data
Types 1, 2, 3 and 4.
7.1.3 Downlink SDS Routing
Downlink SDS messages Type 4 are presumed to contain a Protocol Identifier in order to identify
the target application, so if an external application has registered with the terminal for that PI, the
terminal will deliver the message to the target application. If the terminal receives the same
message with the same PI more than once due to successive retransmissions and it has already
been acknowledged by the terminal it will neither store or re-send the messages to the target
application.
7.2 SDS Addressing.
The terminal can accept SDS messages that are sent to any of the following addresses being used
by the terminal:
• The terminal’s TETRA individual address (ISSI)
• Any group address (GSSI) that the terminal is monitoring
• The TETRA Broadcast address
A terminal user is able to send SDS messages to any TETRA address.
7.3 Status Messaging (Pre-defined)
7.3.1 Sending Status Messages (System Dependent)
The mobile status service is provided using SDS Status [Ref 1], clause 13. The terminal user can
select from a list of up to 100 pre-programmed alphanumeric aliases each of which corresponds to
a status value. The valid range of uplink status values is a set of provisioned parameters (min/max).
If the terminal is not provisioned for targeted status, the status value will be sent over the air
interface to the address of the selected group.
The terminal will recognize the General status ack sent by the SwMI, as well as negative
acknowledge as defined in [Ref 11].
In TMO if no status ack or negative ack is received, the terminal will retry sending the message. The
number of retries and amount of time to wait before retrying are provisioned parameters. The user
will be notified regarding the delivery status.
As there is no ack for DMO status messages, the user will be notified only of sending the status
message.
The terminal should not initiate sending of status messages on a traffic channel.
7.3.2 Receiving Status Messages (System Dependent)
The terminal is capable of receiving status messages on any address that it is monitoring and during
calls.