Allied Telesis AT-S63 - Manual (Page 109)

AT-S63 Management Software Menus Interface User’s Guide
Section I: Basic Features 109
A switch port using autonegotiation defaults to half-duplex if it
detects that the end node is not using autonegotiation. This
results in a mismatch if the end node is operating at a fixed duplex
mode of full-duplex.
To avoid this problem, when you connect an end node with a
fixed duplex mode of full-duplex to a switch port, you should
disable autonegotiation on the port and set the port’s speed and
duplex mode manually.
❑ When the port is set to autonegotiate, the MDI/MDI-X setting is
locked at auto-MDI/MDI-X. The switch automatically determines
the correct MDI/MDI-X setting. You cannot set MDI/MDI-X
manually.
❑ When autonegotiation 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 autonegotiation
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.
Note
Options 7, 8, and 9 are not available for SFP and GBIC ports 23 and
24 which are automatically set to 1000 Mbps, full-duplex, and auto-
MDI/MDIX.
7 - Speed
This option is only available when Negotiation is set to Manual.
Type 7 to toggle between two selections:
10 Mbps
100 Mbps
1000 Mbps is only available when you set selection 6, Negotiation,
to Automatic.
8 - Duplex
This option is only available when Negotiation is set to Manual.
The possible settings are full-duplex and half-duplex.
9 - MDI Crossover
This option is only available when Negotiation is set to Manual.
This selection sets the wiring configuration of the port. The
configuration can be MDI or MDI-X.
The twisted pair ports on the switch feature auto-MDI/MDI-X.
They configure themselves automatically as MDI or MDI-X when
connected to an end node. This allows you to use either a straight-