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Duplex Mode
The twisted pair ports can operate in either half- or full-duplex mode at
10/100Mbps and full-duplex mode only at higher speeds.
The duplex mode of a port operating at 10/100Mbps, like port speed, can
be set manually using the management software or automatically with
Auto-Negotiation (IEEE 802.3u), the default setting.
The speed and duplex mode settings of a port can be set independently of
each other. For example in the case of a 100Mbps port, it can be
configured such that its speed is set manually while its duplex mode is
established through Auto-Negotiation.
Wiring
The wiring configuration of a port operating at 10/100Mbps can be MDI or
MDI-X. The wiring configurations of a switch port and a network device
Configuration
connected with straight-through twisted pair cabling must be opposite,
such that one device is using MDI and the other MDI-X. For example, a
switch port must be set to MDI-X if it is connected to a network device set
to MDI.
The wiring configurations of the ports can be set manually or automatically
by the switch with auto-MDI/MDI-X (IEEE 802.3ab-compliant). This feature
enables the switch to automatically negotiate with network devices to
establish their proper settings.
The MDI and MDI-X settings do not apply when ports are operating at a
speed of 1Gbps or higher.
Maximum
The ports have a maximum operating distance of 100 meters (328 feet).
Distance
Note
The ports must be set to Auto-Negotiation to function at 1/2.5/5Gbps
speeds and are not compatible with devices that are not IEEE
802.3u-compliant.
Note
Switch ports default to half-duplex mode when connected to
10 Mbps/100 Mbps network devices that do not support Auto-
Negotiation. If a network device supports full-duplex only, a duplex
mode mismatch can occur, resulting in poor network performance.
To prevent this, disable Auto-Negotiation and set the duplex mode
manually on ports connected to 100Mbps devices that support full-
duplex only.
x530DP Series Installation Guide for Standalone Switches
31
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