48
NWC Voyager
LES
TELEPHONE
NETWORKS
DATA
NETWORKS
ON
48V DC
SYNC
ALARM
RS-232 A
RS-232 B
USB
ISDN
ISDN
ISDN
TX
+
TX
-
R
X
+
R
X
-
N
M
E
A
-
N
M
E
A
+
5 4 3 2
1
9 8 7 6
5 4 3 2
1
9 8 7 6
1 8
8 1
RS-422
TX
-
TX
+
R
X
-
R
X
+
R
P
7
8
9
4
5
6
1
2
3
S
0
#
R
NCS
MES
Inmarsat Fleet system
The Inmarsat Global Area Network service (GAN)
provides 4.8 kbps voice communications service and
64 kbps data transmission to and from mobile/fixed
subscribers anywhere within the worldwide coverage
of the Inmarsat 3 spot Beam system,
The benefit of the INMARSAT system
is its high capacity, and the rapid and
reliable connection between the land
based (fixed) users and the
Mobile
Earth Stations (MESs)
.
Each satellite region is under the
control of a
Network Coordinating
Station
(
NCS
), which controls and
monitors the traffic between the
MESs and the LESs.
NCS:
Network Coordinating Station,
one in each Ocean Region (super-
vises all messages and signals sent in
the Inmarsat system).
LES:
Land Earth Station w/Net
service providers (interconnects fixed
telecommunication networks with the
Inmarsat system.
MES:
Mobile Earth Station
(NWC Voyager, a user terminal for the
Inmarsat system).
Overview of the Inmarsat Fleet system.
Summary of Contents for NWC Voyager
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