Ethernet Connections; Figure 2-3. Connection Diagram To An Rj45 Jack - Lantronix MatchPort AR Integration Manual

2:Description and Specifications
There is an on board capacitor, 0.1uF to ground, at the RESETIN# to filter out
transient voltages. However, as always, it is a good practice to have RESETIN# trace
on the target board as short as possible to avoid reset occurrences when transient
voltages such as those caused by ESD are present.

Ethernet Connections

The MatchPort AR provides Ethernet interface transmit ETX and receive data ERX
connections from a PHY device. Thus, before presenting signals to the outside world
using an RJ45 jack, a 1:1 Ethernet Magnetics is needed to interface and to isolate
the unit. A recommended connection diagram to an RJ45 jack with integrated 1:1
Ethernet magnetics is shown below.

Figure 2-3. Connection Diagram to an RJ45 Jack

We recommend a low capacitance TVS diode array such as a Semtech SRV05-4 at
ETX+, ETX-, ERX+, ERX- if frequent transient voltages are present.
MatchPort AR™ Integration Guide 10