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2008 RuggedCom Inc. All rights reserved Rev104
2.7 Fast Ethernet Ports – Signal Description
The RS969 series switches have several 10/100BaseTX ports that allow connection to standard
CAT-5 UTP cable with industrial RJ45 male connectors or industrial D-coded M12 male
connectors. The RJ45/M12 receptacles are directly connected to the chassis ground on the M969
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/M12 receptacles at
either end. Figure 2.6.1 shows the pin 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)
Figure 2.6.1 RJ45 Port and M12 Port Pins
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.