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MES interface The MES consists of the Data Circuit
Terminating Equipment (DCE) and the
Data Terminal Equipment (DTE). The
DCE consists of the antenna unit and
the communication unit. And the DTE
consists of the terminal unit (or a PC),
keyboard and printer.
Terrestrial network The major functions of the LESs are:
interface
1) Telex store-and-forward conversion
2) Handling EGC messages
3) Handling distress alerts
4) Data Reporting and Polling
Types of MES
There are three types of MES: class 1, class 2 and class 3. The
FELCOM 12 is a class 2 MES.
Class 1 1) Transmits messages to LES
2) Receives messages from LES
Class 2 1) The functions of class 1 plus opera-
tion as an EGC receiver when not
transmitting or receiving.
2) EGC-only receiver
Class 3 The function of class 1 plus simulta-
neous operation as a EGC-only receiver.