Twisted-Pair Ports; Ethernet Port Transient Protection - RuggedCom RuggedServer RS400 Installation Manual

Installation
2.7.1 RJ-45 Twisted-Pair Ports
The RS400 Series can be equipped with a number of 10/100BaseTX ports that allow
connection to standard CAT-5 UTP cable with RJ-45 male connectors. These ports
have auto-crossover, auto-negotiation, and auto-polarity features. The RJ-45
receptacles used can accept and take advantage of screened (commonly known as
"shielded") cabling. Figure 2.8.1.1 shows the RJ-45 port pin-out.
Pin Signal
1 +Rx
2 -Rx
3 +Tx
4 No Connection
5 No Connection
6 -Tx
7 No Connection
8 No Connection
Figure 25: RJ-45 Port pin-out

2.7.2 Ethernet Port Transient Protection

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.
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RuggedCom
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RuggedServer™ RS400 Family Installation Guide rev109