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SDS - Short Data Services
When the user sends the message it will be sent via SDS-TL with Protocol Identifier that is
provisioned in the codeplug, and a received report will be requested.
7.6
Air Interface Aspects
7.6.1
SDS-TL Short Form Report
The terminal can be provisioned to send a 'short-form' SDS-TL receive report when the originator of
the message allows short-form report. 'Short-form report' uses specially designated SDS status
values instead of SDS-REPORT.
7.6.2
Text Message Addressing
In addition to support of targeting text messages to a TETRA individual address, the terminal can be
configured to support addressing of a text message to a TETRA group or to a telephone number.
Addressing an SDS message to a phone number is implemented by using it's MS-ISDN number as
an External Subscriber Number and the telephone gateway ID as the called user.
The terminal does not display to the user nor send to the external application SDS messages that
appear to be group messages sent from this terminal.
7.6.3
Text Message Coding Scheme
The terminal supports the coding schemes for text messages:
•
ISO/IEC 8859-1 Latin 1 (8 bits)
•
7-bit alphabet (for GSM compatibility)
•
UCS-2/UTF16 (ISO-10646 [2000])
When sending a message to a PSTN number, 7-bit encoding will always be used. When sending a
message to an SSI or FSSN, 8-bit or UCS-2 encoding will be used (as provisioned).
The terminal will decode downlink messages that use any of the above coding schemes,
irrespective of the source.
7.6.4
Service Center
The terminal support SwMIs that employ store-and-forward service as indicated in the cell's
broadcast information.
The terminal supports use of a service center, whose address is provisioned in the terminal. Store
and forward operation is supported. However, the terminal will only notify the user upon successful
sending of the message, and not wait for the report from the service center. This is due to
deficiencies in the air interface that do not account for long lifetime of messages (for example: The
Message Reference provides a very short range of values).
7.6.5
User Defined Data Types 1, 2 and 3
Downlink SDS messages types 1, 2 and 3 are always routed to the PEI when an AT application is
registered.
If no external application is registered, the message will be discarded.
Note: Type 1,2, and 3 user defined short messages are not supported by DMO SDS.
March 2009
Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual
2-25
6866588D21-D
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