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Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
Chapter 2 Rack-Mounting, Tabletop Installation, and Cabling
Connecting I/O Cables
Figure 2-11 Console and Auxiliary Port RJ-45 Connectors
Connecting Native Gigabit Ethernet and Fast Ethernet/Ethernet Cables
Note See Chapter 3, “Starting and Configuring,” the “Configuring the Native Gigabit Ethernet and Fast
Ethernet/Ethernet Interfaces” section on page 3-15, for information on configuring and troubleshooting
the Gigabit Ethernet and Fast Ethernet/Ethernet interfaces.
The Cisco 7401ASR router has two Ethernet interfaces and four physical Ethernet ports, two RJ-45
(10/100 Mbps) ports and two Gigabit Ethernet (1000 Mbps) ports. Only two of the four ports can be in
use at any one time.
There are two PCI buses. One Gigabit Ethernet (1000) port and one Fast Ethernet RJ-45 (10/100) port
are on the PCI bus 1. The port adapter slot, one Gigabit Ethernet (1000) port, and one Fast Ethernet RJ-45
(10/100) port are on PCI bus 0.
Attaching the Fast Ethernet/Ethernet 10/100 Cables
The RJ-45 ports support IEEE 802.3 (Ethernet) and IEEE 802.3u (Fast Ethernet) interfaces compliant
with 10BASET and 100BASETX specifications.
The RJ-45 port supports standard straight-through and crossover Category 5 unshielded twisted-pair
(UTP) cables with RJ-45 connectors. Cisco Systems does not supply Category 5 UTP cables; these
cables are available commercially.
See Appendix A, “Specifications,” for Fast Ethernet RJ-45 port specifications.
Intra-Building Lightning Protection
Shielded cables, which are grounded at both ends are required to be used on the 10/100 Ethernet port in
order to be in compliance with requirement R4-11 in GR-1089-Core for a Central Office environment.
This is not a requirement for customer premise installations.
1 Auxiliary port 4 Cable to modem or DCE
2 Console port 5 Cable to console terminal or DTE
3 RJ-45 connector
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