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Chapter 6: Port Parameters

Section I: Basic Operations 100

If you set option 4 - Negotiation to Manual, which disables Auto-

Negotiation on a port, the auto-MDI/MDI-X feature is disabled as

well and this menu option appears with the two possible settings

of MDI and MDI-X. The default is MDI-X.

4 - Negotiation

You use this selection to activate or deactivate Auto-Negotiation

on a twisted pair port. This parameter has the two settings Auto

and Manual. If you select Auto, a twisted pair port uses Auto-

Negotiation to set its speed, duplex mode, and MDI/MDI-X

settings. This is the default setting. If you select Manual, additional

options appear in the menu for manually configuring these port

settings. If you are configuring a fiber optic port, the only setting

available is Manual.

You should note the following concerning the operation of Auto-

Negotiation:

❑ In order for a twisted pair port to successfully Auto-Negotiate its

duplex mode with an end node, the end node should also be

using Auto-Negotiation. Otherwise, a duplex mode mismatch can

occur. A switch port using Auto-Negotiation defaults to half-

duplex if it detects that the end node is not using Auto-

Negotiation. This can result in a mismatch if the end node is

operating at a fixed duplex mode of full-duplex.

To avoid this problem, when connecting an end node with a fixed

duplex mode of full-duplex to a switch port, you should disable

Auto-Negotiation on the port and set the port’s speed and duplex

mode manually.

❑ When the port is set to Auto-Negotiate, the MDI/MDI-X setting is

locked at auto-MDI/MDI-X. The switch automatically determines

the correct MDI/MDI-X setting. You cannot manually set

MDI/MDI-X manually.

❑ When Auto-Negotiation is disabled on a twisted pair port, the

auto-MDI/MDI-X feature on a port is also disabled, and the port

defaults to the MDI-X configuration. If you disable Auto-

Negotiation and set a port’s speed and duplex mode manually,

you might also need to set the port’s MDI/MDI-X setting as well.

5 - Speed

This selection is used to set the speed of a twisted pair port. It only

appears when option 4 - Negotiation is set to Manual. The

possible settings are:

0010 10 Mbps

0100 100 Mbps

You cannot change the speed of a fiber optic port.

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Allied-telesis AT-S62 Manual de usuario Pagina 100

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