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FELCOM 15 Operator's Manual K 7-10-09 - Furuno USA

FELCOM 15 Operator's Manual K 7-10-09 - Furuno USA

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Communications Network<br />

INMARSAT C SYSTEM<br />

The illustration below shows the Inmarsat C communications network.<br />

NCS/LES<br />

Signaling Link<br />

Network<br />

Coordination<br />

Station (NCS)<br />

NCS/NCS Signaling Link<br />

NCS Common Channel<br />

Data<br />

Communications<br />

Network<br />

Telex Network<br />

Land Earth<br />

Station<br />

(LES)<br />

Terrestrial<br />

Communications<br />

Network<br />

MES Signaling<br />

Channel<br />

MES Message<br />

Channel<br />

LES TDM<br />

Channel<br />

Data Circuit<br />

Terminating<br />

Equipment<br />

(DCE)<br />

Mobile Earth<br />

Station (MES)<br />

Data Terminal<br />

Equipment (DTE)<br />

Enhanced Group<br />

Calling (EGC) Receiver<br />

Inmarsat C communications network<br />

NCS common channel<br />

NCS/LES signaling link<br />

LES TDM channel<br />

MES message channel<br />

MES signaling channel<br />

NCS/NCS signaling link<br />

MES interface<br />

Terrestrial network<br />

interface<br />

The NCS has two major functions:<br />

1) Transmitting information on a common channel.<br />

2) Transmitting EGC messages to MESs.<br />

This is the link between NCS and all LESs in its<br />

region. All EGC messages pass through this link.<br />

This channel carries the circuit control signal for<br />

MES and transmits messages from LES to MES.<br />

This channel carries messages from MES to LES.<br />

This channel transmits requests, distress alerts, data<br />

reports, etc. In addition, it carries login and logout<br />

from MES to NCS.<br />

This is the link between NCSs. It exchanges data<br />

between MESs operating in different ocean regions.<br />

The MES consists of the Data Circuit Terminating<br />

Equipment (DCE) and the Data Terminal Equipment<br />

(DTE). The DCE consists of the antenna unit, and<br />

the DTE consists of a terminal unit, a keyboard and<br />

printer.<br />

The major functions of the LESs are:<br />

1) Telex store-and-forward conversion<br />

2) Handling EGC messages<br />

3) Handling distress alerts<br />

4) Data Reporting and Polling<br />

xiii

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