Furuno RC-1500-1T - Manual (Page 265)

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-
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.
LES TDM channel This channel carries the circuit control
signal for MES and transmits messages
from LES to MES.
MES message channel This channel carries messages from
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.
NCS/NCS signaling link This is the link between NCSs. It ex-
changes data between MESs operating
in different ocean regions.