Lan Interface - KVH Industries TracPhone FB250 Installation Manual

4.7 LAN interface

4.7.1 Overview
The terminal has four Ethernet LAN ports with Power over Ethernet (PoE). The
Ethernet ports are standard IEEE 802.3 af ports using RJ-45 connectors.
4.7.2 Power over Ethernet (PoE)
One power supply powers all four interfaces with a floating 48 V DC supply
(44 - 57 V DC). 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 Negative PoE Voltage.
The total output power from all 4 interfaces is
• 64 W at 24 V DC power supply
• 32 W at 12 V DC 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 closed down.
In case of power hold-up (failure on input power), PoE will be turned off.
Chapter 4: Hardware interfaces
LAN interface 63