Allied Telesis AT-MC605 - Manual (Page 20)

Overview
20
ethernet port is set to 100 Mbps.
Half- and Full-duplex Mode
Duplex mode refers to the way an end-node sends and receives data on
the network. An end-node can operate in either half- or full-duplex mode,
depending on its capabilities. In half-duplex mode, data can be either sent
or received, but not at the same time. In full-duplex mode, data can be
sent and received simultaneously. The best network performance is
achieved when an end-node can operate at full-duplex, since the
end-node is able to send and receive data simultaneously.
The AT-MC605 VDSL Ethernet Extender can Auto-Negotiate to either
half- or full-duplex mode, but cannot be manually configured to either
mode. As a consequence, the end node must also be operating in the
Auto-Negotiation mode for proper operation.
Note
For Auto-Negotiation to operate properly, the end-nodes connected
to the AT-MC605 VDSL Ethernet Extender should also use Auto-
Negotiation. If an end-node does not have this feature and has a
fixed duplex mode of full-duplex, the result will be a duplex mode
mismatch with the end-node. The AT-MC605 ethernet port ends up
in the half-duplex mode if it is connected to an end-node with a fixed
full-duplex mode. This configuration can produce network
performance problems. Should you encounter this situation, you
must configure the port on the end-node to use Auto-Negotiation or,
if it lacks that feature, to half-duplex.