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INMARSAT FLEET BROADBAND
MODEL
FELCOM 250/FELCOM500
FX MODE SET UP
This manual is intended as an addition to the FELCOM250/FELCOM500 operator’s manual and
covers the set up procedure for FX mode. Refer to the operator’s manual for information regarding
the following items:
• How to turn the power on/off.
• How to operate the equipment and the equipment functions.
1. 1. Overview of the FX Service
The FX (Fleet Xpress) service is provided by the INMARSAT company and utilizes Ka band sat-
ellites to provide high speed connection. A GX terminal is required to use this service.
NOTE 1:
The FX and FBB services cannot be used simultaneously.
NOTE 2:
The FELCOM250/500 terminals allow use of the FBB service. They are not GX termi-
nals.
2. FELCOM250/FELCOM500’s Role in the FX Service Network
The FELOM250/FELCOM500 units function as a backup communication device when using the
FX service.
If the signal from the GX terminal is dropped during transmission, the line is automatically switched
from the GX terminal to the FELCOM250/FELCOM500. The automatic switching is conducted by
the Network Service Device (NSD), which controls the FELCOM250/FELCOM500, Packet
Switching (PS)* and disconnection.
*: Packet switching is dividing the data to be transferred into smaller pieces (packets) before
transmitting the data. For brevity, all references to packet switching hereafter are written as “PS”.
3. How to Connect the FELCOM Unit to the NSD
Connect the LAN cable from the NSD to the FELCOM unit LAN port to be assigned for the FX
service.
Shipboard
LAN
NSD
GX Terminal
Satellite
Satellite
FELCOM250/500
When using the FX service, if the GX
terminal becomes unusable
(disconnected, cannot transmit, etc.),
the NSD switches the line to the
FELCOM unit automatically.
