Allied Telesis AT-S62 - Manual (Page 101)

AT-S62 User’s Guide
Section I: Basic Operations 101
If you select Auto for Auto-Negotiation, which is the default
setting, the switch will set both speed and duplex mode for the
port automatically. The switch determines the highest possible
common speed between the port and its end node and sets the
port to that speed. This helps to ensure that the port and the end
node are operating at the highest possible common speed.
You should note the following concerning the operation of Auto-
Negotiation on a switch port:
❑ In order for a switch 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 will default to half-duplex if it
detects that the end node is not using Auto-Negotiation. This will
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 port, the auto-MDI/MDI-
X feature on a port is also disabled, and the port defaults to the
MDI-X configuration. Consequently, 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.
If you select Manual, two additional selections are displayed in the
menu:
Figure 23 Manual Speed and Duplex Mode Settings
You use these selections to manually set a port’s speed and
duplex mode. The possible settings for the 2 - Speed selection are:
0010 10 Mbps
0100 100 Mbps
1000 1000 Mbps (optional Gigabit Ethernet ports only)
5 - Speed .............. 0100
6 - Duplex ............. Full