Furuno RC-1500-1T Manuel D’Utilisation
9
Communications Network
Figure 4 shows the Inmarsat-C communications network.
Figure 4 Inmarsat-C communications network
NCS common channel
The NCS has two major functions:
1) Transmitting information on a com-
1) Transmitting information on a com-
mon channel.
2) Transmitting EGC messages to MESs.
NCS/LES signalling link
This is the link between NCS and all
LESs in its region. All EGC messages
pass through this link.
LESs in its region. All EGC messages
pass through this link.
LES TDM channel
This channel carries the circuit control
signal for MES and transmits messages
from LES to MES.
signal for MES and transmits messages
from LES to MES.
MES message channel
This channel carries messages from
MES to LES.
MES to LES.
MES signaling channel
This channel transmits requests, distress
alerts, data reports, etc. In addition, it
carries login and logout from MES to
NCS.
alerts, data reports, etc. In addition, it
carries login and logout from MES to
NCS.
NCS/NCS signaling link
This is the link between NCSs. It ex-
changes data between MESs operating
in different ocean regions.
changes data between MESs operating
in different ocean regions.