Furuno Inmarsat FleetBroadband FELCOM251 Installation Manual page 76

5. HARDWARE INTERFACES
5.7.5 Notice for network connection
With a hub(s), FELCOM251/FELCOM501 can establish a network configuration. If the
hub(s) is connected in loop form, the FELCOM251/FELCOM501 may not function nor-
mally.
Never connect as follows:
Communication Unit Communication Unit Communication Unit
FB-2001 FB-2001 FB-2001
FB-2001-F19 FB-2001-F19 FB-2001-F19
LAN
LAN
LAN
LAN
Hub Hub
Hub
[Hub 1 set]
Hub
Hub
Hub
[Hub 2 sets] [Hub 3 sets]
Note: If you install a switching hub that does not have an automatic function to distin-
guish straight/cross (MDI/MDI-X) connections, you will need to select a proper cable:
• Use a straight connection cable for an MDI to MDI-X connection.
• Use a cross connection cable for an MDI to MDI or MDI-X to MDI-X connection.
Generally, it is advisable to use an auto MDI/MDI-X switching hub.
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