RJ45 Ports Signal Description, 1 RJ45 Port Pins

2.4 RJ45 Ports – Signal Description

The RJ45 port accepts standard category 5 unshielded twisted pair (UTP), or screened twisted pair (STP) cable with RJ45 male connectors. Fig. 2.3.1 shows the RJ45 port pin configuration. Both RJ45 Ethernet ports on the RMC40TM are auto-crossover, auto-polarity, auto-crossover (MDI / MDIX) equipped, for simple plug-and-play operation.

Although transient suppression circuitry is present on all RJ45 ports, they cannot protect the port from high-amplitude, high-energy transients that can potentially damage the RMC40TM and its link partners. In general, RuggedCom strongly recommends limiting connections used by the RJ45 ports to those that are less than 3m in length, or limited to environments sufficiently protected from such transients.

PIN 8

PIN 1

PIN SIGNAL

1RX+

2RX-

3TX+

4n.c.

5n.c.

6TX-

7n.c.

8n.c.

Fig. 2.3.1 RJ45 Port Pins

NOTE: For substation applications it is not recommended to use these ports to interface to field devices across distances which could produce high levels of ground potential rise (GPR), (i.e. greater than 2500V) during line-to-ground fault conditions.

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