4 Ethernet Ports
4.1 RJ45 Ethernet Ports
The RS910W has several 10/100Base-TX ports that 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 RJ45 port pin-out.
Figure 13 - RJ45 Ethernet 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 |
Case | Shield (Chassis Ground) |
Table 2 - RJ45 Ethernet port pin-out
NOTE: RuggedCom does not recommend the use of CAT-5 (10/100Base-TX communications) 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.
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