Allied Telesis AT-S62 - Manual (Page 60)

Chapter 5: Port Parameters
Section I: Basic Operations 60
If you are configuring a twisted pair port and you select Auto-
Negotiation, which is the default setting, the port’s speed, duplex
mode, and MDI/MDI-X settings are set automatically.
You should note the following concerning the operation of Auto-
Negotiation on a twisted pair 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.
❑ If you disable Auto-Negotiation 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.
Here are the possible settings for a twisted pair port:
❑ Auto: The port uses Auto-Negotiation to set both speed and
duplex mode. This is the default.
❑ 10Mbps - Half Duplex
❑ 10Mbps - Full Duplex
❑ 100Mbps - Half Duplex
❑ 100Mbps - Full Duplex
Note
Ports 49R and 50R on an AT-8550GB Series switch must be set to
Auto-Negotiation in order to operate at 1000Mbps. You cannot
manually configure these ports to 1000Mbps.
Here are the possible settings for a fiber optic port:
❑ Half Duplex
❑ Full Duplex: This is the default setting