B-3
Cisco uBR905 Router Hardware Installation Guide
OL-0598-01 (9/2000)
Appendix B Connector and Cable Specifications
Ethernet Connector and Cabling
Figure B-2 shows the RJ-45 connector and plug used for the Cisco uBR905 router’s Ethernet ports.
Table B-1 lists the pinouts and signals for the RJ-45 connector.
Figure B-2
RJ-45 Connector and Plug
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
RJ-45 Cable Identification
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.
Table B-1
RJ-45 Receptacle Pinouts
Pin
Description
1
Receive Data + (RxD+)
2
RxD–
3
Transmit Data + (TxD+)
6
TxD–
H2936
8 7 6 5 4 3 2 1
RJ-45 connector
H5663
