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2008 RuggedCom Inc. All rights reserved Rev103
2.6 RJ45 Ports – Signal Description
Units with 10/100Base-TX ports allow connection to standard Category 5 (CAT-5) unshielded
twisted-pair (UTP) cable with RJ45 male connectors. The RJ45 receptacles are directly connected
to the chassis ground on the unit and can accept CAT-5 shielded twisted-pair (STP) cables. If
shielded cables are used, care must be taken to ensure the shielded cables do not form a ground
loop via the shield wire and the RJ45 receptacles at either end. The figure below shows the shows
the RJ45 port pin-out and LEDs.
Figure 9 - RJ45 port pin-out and LEDs
Pin Signal
1 +Rx
2 -Rx
3 +Tx
4 No Connection
5 No Connection
6 -Tx
7 No Connection
8 No Connection
Case Shield (Chassis Ground)
Table 3 - RJ45 port pin-out
NOTE: RuggedCom does not recommend the use of copper cabling of any length for critical real-
time substation automation applications. However, transient suppression circuitry is present on all
copper ports to protect against damage from electrical transients and to ensure IEC 61850-3 and
IEEE 1613 Class 1 conformance. This means that during the transient event communications
errors or interruptions may occur but recovery is automatic.
RuggedCom also does not recommended to use these ports to interface to field devices across
distances which could produce high levels of ground potential rise, (i.e. greater than 2500V) during
line to ground fault conditions.