Chapter 1: Introduction
12 The Inmarsat C services
3027 sends its reports to this mailbox and other tracking systems can then
access and empty the mailbox. The SAILOR 3027 supports up to 64 DNIDs.
Up to 255 mobile terminals can use the same DNID, and the specific
terminal is identified by a member number between 1 and 255.
The DNID must be created on the LES before the position-reporting feature
can be used. Once the DNID account is created, the LES can download the
DNID information to the desired terminals, thereby enabling them to send
reports to the DNID.
Data reports and polling
Inmarsat C users may need to acquire information (short data reports) from
vessels, or to collect data automatically at fixed or variable intervals.
The data reporting service allows for the transmission of information, in
packets of up to 32 bytes on request or at prearranged intervals from the
SAILOR 3027, to shore-based customers.
Polling allows shore-based subscribers to interrogate a single or a group of
SAILOR 3027 by sending a special polling command. The polling command
instructs the SAILOR 3027 or a group of SAILOR 3027 to send a data report
immediately, start sending regular reports, change transmission schedule of
reports or perform another task of the polled SAILOR 3027 terminal(s).
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