Rj45 Twisted-Pair Data Ports - RuggedCom RuggedSwitch RS1600 Installation Manual

2.6 RJ45 Twisted-Pair Data Ports

RS1600 series switches may have 10/100BaseTX ports that allow connection to standard CAT-5
UTP cable with RJ45 male connectors. The RJ45 receptacles are directly connected to the chassis
ground on the RS1600 and can accept shielded CAT-5 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.
All RJ45 RuggedSwitch products feature auto-negotiating, auto-polarity, and auto-crossover
functions with the exception of the base RS1600 model (port 15 and 16 only). The base RS1600
(RS1600-XX-XX-XX-XX-RJ) is not auto-crossover capable. Fig. 2.6.1 shows the RJ45 port pins
configuration.
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)
Fig. 2.6.1 shows the RJ45 port pins configuration.
NOTE: RuggedCom does not recommend the use of CAT-5 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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2008 RuggedCom Inc. All rights reserved
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