3: Evaluation Kit
XPort AR Integration Guide
25
PoE Socket
The PoE Socket (Samtec: SSQ-105-01-G-D; Oupiin: 2044-2 X 5 G S; Molex: 15-44-3205)
provides access to both the used pairs and unused pairs from the Ethernet. It provides
connection to the evaluation board’s 3.3V power switch, signal ground, and chassis ground.
The socket’s pinouts are:
Pin 1, PoE45: Ethernet signals 4 and 5. (These two Ethernet pins are connected together
inside the XPort AR and exit out of this pin.)
Pin 2, PoE12: Ethernet signals 1 and 2. (This pin comes from the center tap of the XPort
AR’s PoE compliant magnetics connected to the Ethernet pins 1 and 2.)
Pins 3 & 4, 3V3PoE: Connect to the evaluation board’s power switch.
Pins 5 & 6: Connect to the evaluation board’s chassis ground. (Connection is optional.)
Pins 7 & 8, GND: Connect to the evaluation board’s signal ground.
Pin 9, PoE36: Ethernet signals 3 and 6. (This pin comes from the center tap of the XPort
AR’s PoE compliant magnetics that are connected to Ethernet pins 3 and 6.)
Pin 10, PoE78: Ethernet signals 7 and 8. (These two Ethernet pins are connected
together inside the XPort AR and exit out of this pin.)
Ground Turret
The turret marked GND (lower right corner of prototyping area) is a convenient way to
connect an oscilloscope or DMM ground clip to signal ground. This type of ground
connection has proven to be a much more secure way to keep an alligator-type clip in place.
For smaller clip leads, the pins of JP5 are also connected to signal ground.
Power Supply
The evaluation board typically uses 3.3 VDC regulated input power entering through a 1.3
mm input power jack. It is possible to power the board from 3.3 VDC input to the PoE socket,
S1; this is usually only performed in combination with an external PoE circuit also connected
to S1. The evaluation kit provides a 3.3 VDC 1.3 mm power module.
It is recommend that chassis ground of the evaluation board be connected to an earth
ground. Chassis ground on the evaluation board is found at the four mounting holes, the D-
connector shells, and the XPort AR shell.
Schematic
The XPort AR evaluation board schematic shows the relationships of all of the previously
described components.