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CHAPTER 1 Overview
5
The maximum cable distance between the port and the attached device
is 100 meters (328 feet), including all patch cables, panels, and
connectors.
MDI/MDI-X Switch
The MDI/MDI-X switch on the front panel of the Express hub is a
recessed push-button switch that allows you to select MDI or MDI-X
wiring for port 1. As indicated on the front panel, port 1 is configured
for MDI-X wiring when the push button is in the out position. When
the push button is pressed in, port 1 is configured for MDI wiring.
The MDI/MDI-X switch eliminates the need to use a crossover cable
if you are connecting similar devices. Use the following guidelines to
configure port 1 for MDI or MDI-X wiring:
• Configure port 1 for MDI-X wiring if the remote end of the cable
is connecting to an MDI-wired device (such as a network station
or a router).
• Configure port 1 for MDI wiring if the remote end of the cable is
connecting to an MDI-X device, such as a 10/100 Mbps switch.
MDI-X ports 2 through 12 cannot be configured for MDI wiring. If
you are using one of these ports to connect to another MDI-X port,
you must use an RJ-45 crossover cable to connect the two ports.
LED Matrix
The LED matrix on the front panel of the Express hub allows you to
identify:
• The status of the hub AC power supply.
• The operational status of the hub.
• A collision occurrence on an Ethernet segment in a standalone hub
or a stack of hubs.
• The network utilization of the Ethernet segment in a standalone
hub or a stack of hubs.
• The status of the expansion module or the status and mode of a
network management module (NMM) installed in the expansion
slot.
• The status for all ports in the hub, including port 1 on the optional
media adapter when installed in the media adapter slot.