Table of Contents
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Chapter 1: Overview
Wiring
Configuration
Maximum
Distance
Power Over
Ethernet
26
The speed and duplex mode settings of a port may be set independently
of each other. For example, a port may be configured such that its speed
is set manually while its duplex mode is established through Auto-
Negotiation.
Note
A switch port that is connected to a network device that does not
support Auto-Negotiation and has a fixed duplex mode of full-duplex
should not set its duplex mode with Auto-Negotiation. A duplex-
mode mismatch in which a switch port and a network device operate
at different duplex modes, may occur. The duplex modes of switch
ports that are connected to network devices that do not support
Auto-Negotiation should be set manually through the management
software.
The wiring configuration of a port can be MDI or MDI-X. The wiring
configurations of a switch port and a network device connected with
straight-through twisted pair cabling have to be opposite, such that one
device is using MDI and the other MDI-X. For instance, a switch port has
to be set to MDI-X if it is connected to a network device set to MDI.
You may set the wiring configurations of the ports manually or let the
switch configure them automatically with auto-MDI/MDI-X (IEEE 802.3ab-
compliant). This feature enables the switch to negotiate with network
devices to establish the proper settings, so that the ports on the devices
are using different wiring configurations.
The ports have a maximum operating distance of 100 meters (328 feet).
The 10/100Base-TX ports on the AT-FS980M/9PS, AT-FS980M/18PS,
AT-FS980M/28PS, AT-FS980M/28DP, and AT-FS980M/52PS switches
support Power over Ethernet (PoE), which is a standard whereby DC
power is provided by the switch to network devices over the network
twisted pair cables. The switches support PoE (IEEE 802.3af) and PoE+
(IEEE 802.3at). For background information, refer to "Power Over
Ethernet" on page 32.
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