Cisco uBR924 Installation Manual page 83

Appendix B Connector and Cable Specifications
When the router is configured for routing mode, one of the four connectors can be connected to an
•
Ethernet hub, which in turn connects additional computers and other Ethernet devices to the local
area network. Typically, a crossover cable connects the router's port to the 10BaseT Ethernet port
on the hub. (However, you may be able to use a straight-through cable if the hub has an uplink port;
see the hub's documentation for further details.)
Figure B-2 shows the RJ-45 connector and plug used for the Cisco uBR924 router's Ethernet ports.
Table B-1 lists the pinouts and signals for the RJ-45 connector.
Figure B-2
8 7 6 5 4 3 2 1
RJ-45 connector
To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to
Warning
telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN
ports contain TNV circuits. Some LAN and WAN ports both use RJ-45 connectors. Use
caution when connecting cables.
Table B-1
Pin
1
2
3
6
Referring to the RJ-45 pinout in Table B-1, proper common-mode line terminations should
Note
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.
OL-0338-01 (3/2000)
RJ-45 Connector and Plug
RJ-45 Receptacle Pinouts
Description
Receive Data + (RxD+)
RxD–
Transmit Data + (TxD+)
TxD–
Ethernet Connector and Cabling
Cisco uBR924 Router Hardware Installation Guide
B-3