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Appendix B
Connector and Cable Specifications
Figure B-2
8 7 6 5 4 3 2 1
RJ-45 connector
Table B-1
Pin
1
2
3
6
Note
Referring to the RJ-45 pinout in Table B-1, proper common-mode line terminations should
be used for the unused cable pairs 4/5 and 7/8. Common-mode termination reduces
electromagnetic interference (EMI).
To identify the RJ-45 cable type, hold the two ends of the cable next to each other so you can see the
colored wires inside the ends, as shown in Figure B-3.
Figure B-3
Examine the sequence of colored wires to determine the type of RJ-45 cable:
Straight-through—The colored wires are in the same sequence at both ends of the cable.
•
•
Crossover—The first (far left) colored wire at one end of the cable is the third colored wire at the
other end of the cable.
OL-0799-02 (05/2001)
RJ-45 Connector and Plug
RJ-45 Receptacle Pinouts
Description
Receive Data + (RxD+)
RxD–
Transmit Data + (TxD+)
TxD–
RJ-45 Cable Identification
Ethernet Connector and Cabling
Cisco CVA122/CVA122E Hardware Installation Guide
B-3
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