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Iridium Satellite LLC
Short Burst Data Developers Guide V2.01
4.0 SBD Automatic Notification for Mobile Terminated
Messages and ISU-ISU Messages
The Iridium Short Burst Data service is a fully acknowledged protocol that confirms the delivery of the
messages between the ISU and the GSS. By design, Mobile Originated messages are fully acknowledged
as the ISU is in full control of the transmission. For Mobile Terminated messages the protocol does not
permit the GSS to send an unsolicited MT-SBD message to an ISU as the ISU may not be ready or
available to receive such a message and acknowledge it. Each time the GSS receives a MT-SBD message
for an ISU, it is queued at the GSS until the ISU requests delivery. A capability of notifying the ISU that it has
a queued MT-SBD message waiting for it has been implemented and that capability is called SBD Automatic
Notification.
Prior to the release of SBD GSS Version 4.1, the ISU did not receive a notification that a MT-SBD message
had been queued at the GSS. In order to determine if a message was queued for delivery, the ISU sent
either a MO-SBD message or a ‘mailbox check’ and then the application checked the status codes returned
from the GSS to determine if a MT-SBD message was received by the ISU and whether additional
messages were still queued at the GSS. For applications that required timely notification of queued MT-SBD
messages this process was less than optimal.
To provide a more optimal solution Iridium implemented the SBD Automatic Notification feature in SBD GSS
Version 4.1. This feature notifies the ISU that a MT-SBD message has been queued for it at the GSS. It
does not automatically deliver the MT-SBD message. The actual notification is called a SBD Ring Alert. The
application developer will need to implement an appropriate algorithm in the Field Application to process the
SBD Ring Alert and then initiate a SBD session to receive the queued message.
4.1SBD Automatic Notification for Mobile Terminated Messages
This section provides basic examples of how to configure the ISU. Please also consult the relevant AT
Command set documentation for more detailed information. SBD Automatic Notification requires both
the correct configuration of the ISU through use of AT Commands and the activation of this feature
at the time of provisioning through the use of SPNet.
4.1.1 Automatic Notification Registration
To implement the SBD Ring Alert feature there are a number of implementation steps required:
1. The ISU must have the firmware revision that supports this feature. See Section 1.6. These
versions can be downloaded from the extranet site if required.
2. In the SPNet provisioning database, the SBD Ring Alert option needs to be selected in the
provisioning screen for the ISU. This option indicates to the GSS that SBD Ring Alerts are
intended to be used with this ISU. NOTE: In the majority of the instances where it is reported
that “ring alerts are not working,” it is due to not selecting the Ring Alert option in SPNet for the
ISU.
3. The Field Application is required to execute AT commands to configure the ISU to listen for SBD
Ring Alerts and then the ISU has to complete SBD Network Registration which notifies the GSS
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