Furuno FELCOM251, Installation Manual, Page: 75 / 122

5. HARDWARE INTERFACES
5-6
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.
LAN connector pinout
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.
Pin number Pin function
1 TxD+ input (positive PoE)
2 TxD- input (positive PoE)
3 RxD+ output (negative PoE)
4 not connected
5 not connected
6 RxD- output(negative PoE)
7 not connected
8 not connected
1 2
RJ-45 female connector