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Port Speed
The twisted pair ports are 10/100Base-TX compliant and are capable of both 10
Mbps and 100 Mbps speeds. You can set the port speed manually or, since the
ports are IEEE 802.3 Auto-negotiation compliant, you can let the switch set
each port's speed automatically. With Auto-negotiation, the switch
automatically matches the highest possible common speed between the port on
the switch and the port on the end-node. For example, if an end-node is capable
of only 10 Mbps, the switch sets the port connected to the end-node to 10 Mbps.
Note
Auto-negotiation is activated as the default on each twisted pair port on
the switch. To deactivate Auto-negotiation and set the speeds manually,
refer to the AT-S67 and AT-S68 Software Management User's Guide.
Duplex Mode
The duplex mode refers to the manner in which an end-node sends and receives
data on the network. Depending on its capabilities, an end-node can operate in
either half- or full-duplex mode. An end-node operating in half-duplex can
either send or receive data, but not both at the same time. However, an end-
node operating in full-duplex can send and receive data simultaneously. The
best network performance is achieved when an end-node can operate in full-
duplex mode.
Each twisted pair port on the AT-FS7016 and AT-FS7024 switch can operate
in either half- or full-duplex mode. The twisted pair ports are IEEE 802.3u-
compliant and will Auto-negotiate the duplex mode setting.
If desired, Auto-negotiation on one or all of the ports can be disabled so that you
can set the duplex mode manually through the management software.
Note
In order for a port on the switch to successfully Auto-negotiate its duplex
mode with an end-node, the end-node should also be set to Auto-
negotiation. Otherwise, a duplex mode mismatch can occur. A port on the
switch 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. Consequently, when connecting an end-node with a fixed duplex
mode of full-duplex to a switch port, you should use the management
software to disable Auto-negotiation on the port and set the port speed
and duplex mode manually.
AT-FS7016 and AT-FS7024 Installation Guide
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