Appendix A Twisted-pair and Pin Distribution
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Appendix A Twisted-pair and Pin Distribution
For the connection of 10Base-T/100Base-TX, the twisted-pair must have two pair cable.
Each pair is distinguished with two different colors. For example, one strand is green,
and the other is the alternate of green and white stripes. RJ-45 connector should be
equipped at both ends of the cable.
Fig. A-1 Shows how the connector of RJ-45 is numbered please make sure that the
inserting direction is correct.
1
8
8
1
Figure A-1 Connector of RJ-45
Pin distribution of 10Base-T/100Base-TX
Unshielded twisted- pair (UTP) or shielded twisted-pair (STP) will be used for the
connection of RJ-45: for the connection of 10Mbps, category 3, 4 and 5 of 100 ohm will
be used, and cat.5 of 100 ohm will be used for 100Mbps. Additionally, do make sure that
the connecting length of any twisted-pair shall not exceed 100 meter.
Port of RJ-45 supports automatic MDI/MDI-X operation, PC or server may be
connected with straight-through cable, or connect with other switch or hub. In
straight-through cable, pin 1, 2, 3 and 6 at one end of the cable are connected to pin 1, 2,
3 and 6 at the other end of the straight-through cable respectively. Cross-over cable must
be used for switch or hub with MDI-X port. The pin distribution of
Warning:
Don’t insert a telephone plug into any RJ-45 port. Only use twisted-pair with RJ45
connectors at both ends conforming to FCC standard.
