Allied Telesis IE200 Series - Manual (Page 23)

Chapter 1: Overview
AT-IE200 Series Installation Guide 23
10/100/1000Base-T Twisted Pair Ports
The AT-IE200-6GT and AT-IE200-6GP switches have four 10/100/1000Base-T ports.
Speed
The ports can operate at 10, 100, or 1000 Mbps. You can set the speed manually by using the management
software or automatically with Auto-Negotiation (IEEE 802.3u), the default setting.
Note
The ports must be set to Auto-Negotiation to function at 1000 Mbps. They are not compatible with
devices that are not IEEE 802.3u compliant.
Duplex Mode
The twisted pair ports can operate in either half- or full-duplex mode. The duplex modes, like port speeds,
may be set manually using the management software or automatically with Auto-Negotiation (IEEE 802.3u),
the default setting.
You can set the speed and duplex mode settings of a port 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.
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 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 automatically negotiate
with network devices to establish the proper settings.
The MDI and MDI-X settings do not apply when the ports are operating at 1000 Mbps.