AT-9000 Gigabit Ethernet Switch Installation Guide
26
Note
A switch port connected to a host device that does not support
Autonegotiation, and has a fixed duplex mode of full-duplex, should
not set its duplex mode with Autonegotiation. A duplex-mode
mismatch in which a switch port and a host device operate at
different duplex modes may occur. The duplex modes of switch
ports that are connected to host devices that do not support
Autonegotiation should be set manually through the management
software.
Wiring
Configuration The wiring configuration of a port operating at 10 or 100 Mbps can be MDI
or MDI-X. The wiring configurations of a switch port and a host device
connected with straight-through twisted-pair cabling must 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 host 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 automatically negotiate with
host devices to establish the proper settings.
The MDI and MDI-X settings do not apply when the ports are operating at
1000 Mbps.
Maximum
Distance The ports have a maximum operating distance of 100 meters (328 feet).
Power Over
Ethernet The 10/100/1000Base-T ports on the AT-9000/28, AT-9000/28SP, and
AT-9000/52 switches do not support PoE.
The AT-9000/12POE and AT-9000/28POE switches are equipped with
PoE+ copper ports for a 10/100/1000BASE-T twisted-pair cable.
Cable
Requirements The cable requirements of the ports are given in Table 1 on page 27.