Allied Telesis AT-S62 - Manual (Page 100)

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.