Furuno Inmarsat FleetBroadband FELCOM251 Installation Manual page 75

5. HARDWARE INTERFACES
5.7.2 Power over Ethernet (PoE)
One power supply powers all four interfaces with a floating 48 VDC supply (44 - 57
VDC). Therefore, the interfaces are not galvanically separated from each other. All Tx
signals are DC connected to the Positive PoE Voltage and all Rx signals to the Neg-
ative PoE Voltage.
The total output power from all 4 interfaces is 32 W at 12 - 24 VDC power supply.
All interfaces can support devices of power class 1, 2 and 3 (4, 7 and 15.4 Watt), as
long as the total power consumption does not exceed the above limits. If the limits are
exceeded, the LAN ports are prioritized so that LAN port 1 has the highest priority. For
example, if all ports are used and the total power consumption is too high, port 4 is
shut down.
Power cycle unit in order to regain PoE functionality if is has been lost due to tempo-
rary overload.
In case of power hold-up (failure on input power), PoE will be turned off.
5.7.3 Pinout
The figure and table below show the connector outline and
pin assignments.
Pin number
1
2
3
4
5
6
7
8
5.7.4 Connecting the IP Handset
To connect the IP Handset to the Communication Unit, refer to the Installation Manual
(IME-57050) enclosed in the IP Handset.
5-6
LAN connector pinout
Pin function
TxD+ input (positive PoE)
TxD- input (positive PoE)
RxD+ output (negative PoE)
not connected
not connected
RxD- output(negative PoE)
not connected
not connected
RJ-45 female connector
2 1