TT-3000E mini-C GMDSS User Manual - Polaris-as.dk
TT-3000E mini-C GMDSS User Manual - Polaris-as.dk
TT-3000E mini-C GMDSS User Manual - Polaris-as.dk
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<strong>TT</strong>-<strong>3000E</strong> <strong>mini</strong>-C <strong>GMDSS</strong> <strong>User</strong> <strong>Manual</strong><br />
3.2 SERVICES<br />
The Inmarsat-C system offers a variety of services<br />
including:<br />
3.2.1 MESSAGES<br />
• Message transmission to and from a mobile<br />
unit.<br />
• Broadc<strong>as</strong>t data to groups of mobile<br />
terminals.<br />
• Position reporting from fleets of mobile<br />
units.<br />
• Polling system that enables the operator to<br />
request various data from the mobile units.<br />
• Distress alerting (<strong>TT</strong>-3026C and D only).<br />
This is probably the service that is used most often in<br />
‘average’ installations: It enables the user to send and<br />
receive text messages (like e-mail) on the terminal.<br />
Messaging is carried out via a LES where the user needs to<br />
have an account.<br />
As mentioned in 3.1 there are a number of network types<br />
that connect to the LES (PSTN, Telex, etc.) and generally it is<br />
possible to send and receive messages through each of<br />
these networks. Most LESs work the same way – particularly<br />
seen from the MES’ point of view – but still there are some<br />
differences in are<strong>as</strong> such <strong>as</strong>:<br />
• How to receive and send a message on the Land<br />
side.<br />
• Support for Internet access.<br />
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