Globalstar ST150M User Manual page 55

9150-0125-01 R-1
9.1.3 MIN/MAX BURST INTERVAL SECONDS
The min/max burst interval determines the scheduled time at which queued messages attempt re-transmission, and in
combination with other queued messages sent as an interleaved burst (see Transmit Queue).
9.1.4 INTERVAL AND TIME-OF-DAY MESSAGE LIST
The interval and Time-Of-Day-Message List allows for either interval or time-of-day messages to be used. Both options allow
for selecting many of the message types discussed in the Messages component to send as OTA messages.
Interval messages specify a fixed interval that the selected message type should send, whereas time-of-day messages specify a
specific time of the day the selected message type should send. Minimum time spacing constraints between messages is required.
9.1.5 TRANSMITTER
The transmitter will not transmit any OTA messages until it has been activated. In order to activate a transmitter, the steps
described in the Quick Start section should be followed.
9.1.5.1 End Date
When the transmitter is activated, an end date is set that will cause the transmitter to stop transmitting once that date is
reached.
9.1.5.2 Channel Selection
The transmitter is required to switch channels depending on its global location. The ST150M can automatically channelsteer
the ASIC when a GPS position is obtained or input, or the user can manually set the operating channel.
9.1.5.3 Transmission Exceptions
Occasionally, a transmission exception may occur and prevent a queued message from attempting transmission. This can
be due to an over-temperature condition or RAS exception. If the device is located in close proximity to a network ground
station, federal regulations prohibit transmission.
Transmission exceptions are logged to the device's OTA message logging section.
9.1.5.4 Transmitter Events
Transmitter events can be sent via URCs to indicate asynchronous events that are occurring, and can be very useful for debugging.
9.1.5.5 Transmit Queue
The transmit queue can hold up to 10 pending and current messages.
9.1.5.6 Interleaved Messages
Messages in the transmit queue are automatically scheduled to send in an interleaved pattern to increase throughput of
messages. The number of interleaved messages sent at a time can be adjusted.
9.1.6 MESSAGE PREEMPTION AND ABORTED TRANSMISSIONS
Once the transmit queue is full, adding additional messages can pre-empt existing ones or return an error depending on the
queue pre-emption settings.
9.1.6.1 Preemption Disabled
No message queue requests will preempt any existing messages. User must explicitly abort a message or wait for queued
messages to complete transmitting.
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