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2007 RuggedCom Inc. All rights reserved Rev100
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.