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Iridium Satellite LLC Short Burst Data Developers Guide V2.01 The FA verifies its registration state and enables automatic registration using the “Ask” mode. To ISU (from FA) To FA (from ISU) Description AT+SBDREG? Query the ISU registration status AT+SBDAREG=2 +SBDREG:2 ISU is registered OK … ISU is moved 30 Iridium Satellite LLC Proprietary & Confidential FA sets the automatic registration to “Ask” mode +AREG:0,0 ISU notifies FA that it needs to register AT+SBDREG FA instructs the ISU to register +SBDREG:2,0 Registration is successful 4.1.6 SBD Automatic Notification: Registration (+SBDREG) with Optional GPS Parameter The SBD Network Registration uses a Doppler calculation to update the geo-location at the GSS. This geolocation is inherently imprecise but is adequate for the majority of applications using SBD Automatic Notification. However, it may not be suitable for ISUs installed on very fast moving vehicles, such as aircraft. In this case, it is recommended that the Field Application provide the optional GPS parameter with the manual SBD Network Registration command +SBDREG.
Iridium Satellite LLC Short Burst Data Developers Guide V2.01 4.2ISU- ISU Messages Messages from ISU #1 are to a second ISU (ISU #2) without leaving the Iridium network. [See Figure 4-1.] This option requires provisioning by the Value Added Reseller through SPNet. ISU #1 can be provisioned to send the same MO-SBD message to up to five ISUs. Note that only one delivery method is permitted: Either email or ISU-ISU, it is not possible to mix destination types. ISU-ISU SBD messages are billed twice. Once as a MO-SBD message to the initiating ISU IMEI and once as a MT-SBD message to the terminating ISU IMEI. The MO-SBD message from ISU #1 is placed into the MT-SBD queue of ISU #2 when it has been received by the GSS. The MO-SBD message is never delivered to the Vendor Application as no email address can be programmed for the Vendor Application. No SBD session descriptors are delivered to either the originating or terminating ISU. However if ISU #2 is provided to send MO-SBD messages to a VA, then the mailbox check or sending of a MO-SBD message will cause an email message indicating the mailbox check or the transmission of the MO-SBD message to the Vendor Application. There are five error conditions that can occur in ISU-ISU SBD messaging as shown in Table 4-1 below. Table 4-1: Mobile Originated Message Email Message Field Description Error Condition Action Message size = 0 bytes MT-SBD message will not be queued and will be deleted Message Size >270 bytes when ISU #2 is MT-SBD message will not be queued and will be deleted a 9601 SBD Transceiver Message size >1890 bytes when ISU #2 is a 9522 or 9522A LBT Destination ISU MT queue > 50 messages Destination ISU is not provisioned ISU #1 MT-SBD message will not be queued and will be deleted If the destination ISU MT queue is full the MT-SBD message will not be queued If the destination ISU is not provisioned the MT-SBD message will not be queued Iridium Gateway 31 ETC Subsystem ETS SEP ECS SPP SBD Subsystem Iridium Satellite LLC Proprietary & Confidential ISU #2 Telephony Switch Figure 4-1 SBD Call Routing for ISU-ISU SBD Messages PSTN Internet Email
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