Allied Telesis AT-S39 - Manual (Page 268)

Section III: Web Browser Management
268
Speed and Mode
The operating speed and duplex mode of the port. Possible
settings for this parameter are:
❑ Auto-Negotiate: The port will Auto-Negotiate both speed and
duplex mode. This is the default.
❑ 10Mbps - Half Duplex
❑ 10Mbps - Full Duplex
❑ 100Mbps - Half Duplex
❑ 100Mbps - Full Duplex
If you select 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 duplex 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 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.
Broadcast Storm Control
The maximum number of broadcast packets the port can receive
within a specified period of time. If the threshold is reach, any
additional broadcast packets received on the port are discarded
by the switch. For background information on this feature, refer to