* Four Software Definable Pins (SDPs)
'''Silicon Labs Si3452 Linear Technology LTC4266C Quad High Voltage Port Controller for PoE + PSEConrtoller'''
When connected directly to the host system or configured in Auto mode, each Si3452 high-voltage port controller provides all of the critical circuitry and sophisticated power measurement functionality for the high-voltage interfaces of four complete PSE ports. The Si3452 fully integrates robust, low-RON (0.3Ω typical) power MOSFET switches, low-power dissipation current sensing circuitry, and transient voltage surge suppression devices. The on-chip current sense circuitry and power MOSFETs provide programmable scaling of current limits to match PoE (350 mA, 15.4 W for 2 ports) and PoE+ (600 mA, 30 W for one port) power requirements on a per port basis. Each Si3452 also performs the IEEE-required powered device (PD) detection, classification, and disconnect functionality.<br>
The flexible architecture enables powered device disconnect detection using Silicon Laboratories proprietary dV/dt disconnect sensing algorithm. dV/dt disconnect is an alternative to DC disconnect that requires no additional BOM components, does not dissipate extra device power, and fully interoperates with all powered devices. Also provided are multi-point detection algorithms and per-port current and voltage monitoring.<br>
Pericom Semiconductor's PI6C20400 is a high-speed, low-noise differential clock driver/buffer compatible with CML and HCSL differential I/O technology.
The device distributes a differential input clock to four differential pairs of clock outputs either with or without PLL. The clock outputs are controlled by input selection of several static control signals and Host SMBus interface. The device oriented and designed for PCI Express applications.
'''SPI NOR Flash'''
SPI Flash Reserved for pin compatible 82574L GbE device.
The 82574L requires non-volatile memory content for initialization and configuration. The NVM is connected to a single Serial Peripheral Interface (SPI). The 82574L is compatible with many sizes of 4-wire SPI NVM devices. The required NVM size is dependent upon system requirements. FM-XTDE4U2/4 NVM is implemented with Winbond W25Q80BL 8Mbit Flash memory.
'''RJ45 PoE/PSE port pinout'''
<span style="color:#FF0000">'''Safety Information'''</span><br>
* On every use of FM-POE to deliver Power over Ethernet:** In conjunction with fit-PC and Intense PC computers, 12V power supply must be applied to the power jack on the front panel of FM-POE. The use of PoE with the power supplied via the system board back panel may result in permanent damage to the system.** In Airtop systems, power should be applied to the Airtop power input instead of FACE Module power input. FACE Module power input must not be powered!
=== Schematics ===