Allied Telesis AT-S63 - Manual (Page 39)

AT-S63 Management Software Web Browser User’s Guide
Section I: Basic Operations 39
Speed and Duplex
(Continued) The 1Gb - Full Duplex setting applies only
to 1000Base SFP and GBIC modules and
should not be used because an SFP or
GBIC module should use Auto-
Negotiation to set its speed and duplex
mode.)
A 10/100/1000Base-T twisted pair port
operates at 1000 Mbps only when set to
Auto-Negotiation. You cannot manually
configure a 10/100/1000Base-T twisted
pair port to 1000 Mbps.
Note the following about the operation of
Auto-Negotiation on a switch port.
In order for a switch port to successfully
autonegotiate 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 results 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 its speed and duplex mode manually.
If you disable Auto-Negotiation 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.
Table 5. Port Configuration Window
Parameter Definition