Ports; Copper Ports; Transient Protection; Rj45 Port Pinout - RuggedCom RuggedSwitch RS950G Hardware Installation Manual

3. Ports

3. Ports

3.1. Copper Ports

The RS950G features 10/100/1000TX ports for 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 RS950G automatically disables the copper port when an SFP transciever is
installed in the corresponding fiber port.
Figure 3.1. RJ45 port Pinout

3.1.1. 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.
RuggedCom requires the use of external surge protection in VDSL applications where the line may
be subject to surges greater than that for which the device is rated. Use the following specifications
as a guide for VDSL external surge protection:
• Clamping Voltage: 50V to 200V
• Insertion Loss: < 0.1 dB at 10 MHz
• Peak Surge Current: 10 kA, 8x20µs waveform
RuggedCom® RuggedSwitch™
Pin
1
2
3
4
5
6
7
8
Case
Table 3.1. RJ45 Port Pinout
19 RS950G Installation Guide Rev 100
Signal
+Rx
-Rx
+Tx
No Connection
No Connection
-Tx
No Connection
No Connection
Shield (Chassis Ground)