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Power port
The power port is the connection from the power supply (vessel battery or some other
12 or 24Vdc power source) to the BDU. The power cable has a DC positive power line,
a Remote Switch line and a DC negative power line.
Four RJ-45 Ethernet with Power over Ethernet (PoE) ports
There are four RJ-45 ports with Power over Ethernet (PoE) on the BDU. The ports
supply standard PoE according to the IEEE 802.3af standard and 10/100BaseT
Ethernet. The pinout of the ports supports a direct straight-through connection to a PC
with a standard Ethernet cable. Table 3 shows the pinout of the Ethernet connector.
Note: The +48V and -48V are supplied over the TX, RX pairs.
They are only active when an 802.3af compliant device is
plugged in. The other pairs (4, 5, 7, and 8) are unused.
All four Ethernet interfaces support up to 15 Watts of power to each PoE powered
device. The total power supplied by the PoE is limited to 30W maximum for 12 V
installations. The BDU automatically detects the class of the device plugged in and will
apply power so that the total cannot exceed these limits. If the user attempts to
connect a combination of devices that require more than this, the BDU will not power
any devices that would cause the limit to be exceeded.
Note: Class 4 (802.3at) PD devices are not supported.
Line type
V+ DC power line
Remote Switch
V- DC power line
Table 2. Power port pin out
Pin
1
2
3
4
5
6
7
8
Table 3. RJ-45 Ethernet port pinout
Pin number
1
2
3
RX+
RX-
TX+
NC
NC
TX-
NC
NC
Package materials
11
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