Bde; Poe Feeding - Furuno Felcom 250 Service Manual

10.6.2 BDE

10.6.2.1 PoE feeding

LAN port1 to LAN port4:
The 4 LAN ports are of specification B which is of the PoE (Power over Ethernet) type,
and power is being supplied for the Handsets and the Incoming indicator via the LAN
port.
The maximum power that can be supplied from the LAN port is 48 V/30.8 W. The
power displayed upon the screen is the power actually measured. In normal cases,
power supply values for the Handsets and the Incoming indicator s are;
Handset : Approx. 1.7 W /Class 2
PC: 0 W
If the power supply is abnormally high or low, it can be assumed that the corresponding
device has some kind of a failure.
Reference)
According to the specifications for each Class of PoE, calculation is made based on
the assumption that the Handset power consumption level is 7 W/unit, and that for the
Incoming indicator is 4 W/unit. The specifications for the Handset are those for Class
2, type A and B.
Therefore, if 4 sets of Handsets are inserted into the LAN port, and even if the
displayed value is below 30.8 W, execute the calculation with the assumption that
there are 7 W x 4 equipments = 28 W.
If the calculated value reaches 30.8 W or more, the power supply for the port
connected the last will be terminated by the software. If you reboot the system when
its status is as described here, power will be supplied until the power level reaches the
maximum permissible value in the order of [LAN1] -> [LAN2] -> [LAN3] ->
[LAN4] ports.
Incoming indicator : Approx. 1.2 W /Class 1
SW HUB: 0 W
10-27
10.6 Service