Motorola MTP850 Ex Product Information Manual page 64

2-22
7 SDS - Short Data Services
The terminal in TMO Mode supports Short Data Service (SDS) status and SDS User Defined Data
Types 1,2, 3 and 4, as well as the old SDS-TL standard.
The terminal in DMO supports Short Data Service (SDS) status and SDS User Defined Data Type 4,
both with and without SDS-TL.
7.1 Short Data Bearer Service
The terminal provides a short data bearer service for both internal and external applications.
7.1.1 Transport Layer Services
The terminal supports SDS Transport Layer services which provide end-to-end acknowledgments,
delivery report requests, message numbering, and so forth for SDS User Defined Data type 4
messages. The TL also provides SDS access for applications that do not request these transport
layer services, but use a Protocol Identifier.
The terminal can be provisioned to always send the delivery report by using an appropriate TETRA
signalling, even if the originator requested a short report.
The terminal can be provisioned to support the old SDS-TL standard (as described in [Ref 2]) for
operation on legacy systems, or as defined in [Ref 1] clause 29 for operation on other SwMIs.
7.1.2 External SDS Application Support
An externally connected device may access the SDS services in the terminal via AT commands. An
external application may use this service to send and receive SDS status, 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. If an external application has registered with the terminal for that PI, the terminal
will deliver the message to the target application
The terminal may receive downlink SDS messages that are successive retransmissions of a
message already received and acknowledged by the terminal. The terminal will not display these
messages to the user, nor store in them in the inbox, nor send them to an external application.
7.2 SDS Addressing
The terminal will accept SDS messages sent to any of the following addresses:
• The terminals TETRA individual address
• Any group address that the terminal is monitoring
• The TETRA broadcast address
The terminal allows the user to send an SDS messages to any TETRA address (see section 13
"Numbering and Addressing" on page 2-41) and this address will be used as called user address.
6866588D21-D Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual
Services and Feature Description
March 2009