• Let the ports autonegotiate both speed and duplex.
• Set the port speed and duplex parameters on both ends of the connection.
Procedure
Step 1 When connecting to workstations, servers, and routers, connect a straight-through cable to an RJ-45 connector
on the front panel.When connecting to routers or repeaters, use a crossover cable.
You can use the mdix auto interface configuration command in the CLI to enable the automatic
medium-dependent interface crossover (auto-MDIX) feature. When the auto-MDIX feature is
enabled, the router detects the required cable type for copper Ethernet connections and configures
the interfaces accordingly. Therefore, you can use either a crossover or a straight-through cable for
connections to a copper 100/1000, or an SFP module port on the router, regardless of the type of
device on the other end of the connection.
Note
Step 2 Connect the other end of the cable to an RJ-45 connector on the other device. The port LED turns on when
both the router and the connected device have established link.
If the port LED does not turn on, the device at the other end might not be turned on, or there might be a cable
problem or a problem with the adapter installed in the attached device.
On user network interface (UNI) ports, the port LED is green after the link is established.
Note
Step 3 Reconfigure and reboot the connected device, if necessary.
Step 4 Repeat Steps 1 through 3 to connect each device.
Connecting to SFP Modules
This section describes how to connect to SFP modules. For instructions on how to connect to fiber-optic SFP
modules, see the Connecting to Fiber-Optic SFP Modules section.
For instructions about how to install or remove an SFP module, see the Installing and Removing SFP Modules
section.
Connecting to Fiber-Optic SFP Modules
Follow these steps to connect a fiber-optic cable to an SFP module:
Class 1 laser product. Statement 1008
Danger
Do not remove the rubber plugs from the SFP module port or the rubber caps from the fiber-optic cable until
you are ready to connect the cable. The plugs and caps protect the SFP module ports and cables from
contamination and ambient light.
Caution
Installing the Cisco ASR 920 Series Router
16
Installing the Cisco ASR 920 Series Router
Connecting to SFP Modules
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