Cisco Gigabit Switch Router 12008 Installation And Configuration Manual page 165

Depending on your RJ-45 cabling requirements, use the cable pinouts shown in Figure 3-
14 or Figure 3-15.
Figure 3-14 Straight-Through Cable Pinout (Connecting MDI Ethernet Port to
MDI-X Wiring)
MDI wiring MDI-X wiring
1 TxD+ 1 RxD+
2 TxD– 2 RxD–
3 RxD+ 3 TxD+
6 RxD– 6 TxD–
Figure 3-15 Crossover Cable Pinout (for Connecting Two PRPs)
PRP PRP
1 TxD+ 1 TxD+
2 TxD– 2 TxD–
3 RxD+ 3 RxD+
6 RxD– 6 RxD–
Table 3-8 lists the cabling specifications for 100-Mbps transmission over unshielded
twisted-pair (UTP) cables.
The transmission speed of the Ethernet ports is auto-sensing by default and is user
Note
configurable.
Connecting Route Processor Cables
Installing a Cisco 12008 3-33