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Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide
OL-7677-04
Chapter 2 Switch Installation
Connecting to the 10/100 and 10/100/1000 Ports
Connecting to the 10/100 and 10/100/1000 Ports
The switch 10/100 and 10/100/1000 ports configure themselves to operate at the speed of attached
devices. If the attached ports do not support autonegotiation, you can explicitly set the speed and duplex
parameters. Connecting devices that do not autonegotiate or that have their speed and duplex parameters
manually set can reduce performance or result in no linkage.
To maximize performance, choose one of these methods for configuring the Ethernet ports:
• Let the ports autonegotiate both speed and duplex.
• Set the port speed and duplex parameters on both ends of the connection.
Follow these steps to connect to 10BASE-T, 100BASE-TX, or 1000-BASE-T devices:
Step 1 When connecting to workstations, servers, and routers, connect a straight-through cable to an RJ-45
connector on the front panel. (See Figure 2-17.) When connecting to switches or repeaters, use a
crossover cable. (See the “Cable and Adapter Specifications” section on page A-4 for cable-pinout
descriptions.)
Note 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 switch 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 10/100, 10/100/1000, or 1000BASE-T SFP module port on the switch, regardless of the type of
device on the other end of the connection.
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 switch and the connected device have established link. (See Figure 2-17.)
Figure 2-17 Connecting to an Ethernet Port
The port LED is amber while Spanning Tree Protocol (STP) discovers the topology and searches for
loops. This takes about 30 seconds, and then the port LED turns green. 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. See Chapter 3, “Troubleshooting,” for solutions to cabling
problems.
Note On user network interface (UNI) ports, the port LED is green after the link is established. It does
not turn amber because. STP is not supported.
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