In a straight-through cable, wires 1,2,3,4,5,6,7 and 8 at one end of the cable are still wires 1~8 at the other end. In a crossover cable, the wires of 1,2,3,6 are reversed so that wire 1 become 3 at the other end of the cable, 2 becomes 6, and so forth.
To determine which wire is wire 1, hold the RJ-45 cable tip with the spring clip facing towards the ground and the end pointing away from you. The copper wires exposed upwards to your view. The first wire on the far left is wire 1. You can also refer to the illustrations and charts of the internal wiring on the following page.
Straight-Through Cabling
WireBecomes
11
22
33
66
Cross-Over Cabling
| | Wire | Becomes | | | |
| | 1 | 3 | | | |
| | 2 | 6 | | | |
| | 3 | 1 | | | |
| | 6 | 2 | | | |
Note: | To prevent loss of signal, make sure that the length of any twisted-pair | |
| | connection does not exceed 100 metres. | |
| | | | | | |
| | | RJ-45 Connector | | | |
| | | Pin Assignment | Normal Assignment | | |
| | | | | | |
| | | 1 | Input Receive Data + | | |
| | | 2 | Input Receive Data - | | |
| | | 3 | Output Transmit Data + | | |
| | | 6 | Output Transmit Data - | | |
| | | 4,5,7,8 | Power - PoE pins | | |
| | | | | | |
| | | | | | |
YML720 Rev1 | NetComm NPPOE1001 Power over Ethernet Kit |
www.netcomm.com.au | 11 |
