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10/100BaseTx Pin-out 
Pin Description 
1 RX 
2 RX 
3 TX 
6 TX 
4, 5, 7, 9 
NC 
Table 5:  RJ45 Ethernet pin-out assignment 
5.1.2  Data and Power Ports 
 
The RSG2100P comes standard with 4 10/100BaseTX IEEE 802.3af (PoE) compliant Ethernet 
ports (ports 17 – 20). In addition to the 10/100BaseTX port features, the PoE ports provide nominal 
48 VDC at 350 mA (max 15.4W/port), auto-sensing and automatic power off when cables are 
removed. Table 6 shows the RJ45 PoE pin-out assignment. 
 
10/100BaseTx PoE Pin-out 
Pin Description 
RX + and Power - 
RX - and Power - 
TX + and Power + 
TX - and Power + 
4, 5, 7, 9 
NC 
Table 6: RJ45 PoE pin-out assignment 
5.1.3  Transient Suppression 
 
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. 
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2008 RuggedCom Inc.  All rights reserved 
 
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