10/100 Fast Ethernet Switch User’s Guide
24
Programming The Switch
Port Configurations
The Switch has six port configuration parameters that can be set. These
parameters are briefly described below:
♦
Flow Control
This allows the port to optionally apply flow control
(enable/disable). In full duplex mode, IEEE 802.3X port-based flow
control is implemented. In half duplex mode, collision-based
backpressure jamming (802.3 CSMA/CD MAC protocol) is
implemented. Flow control can be port disabled for links that have no
flow control capability.
♦
Security
This can be enabled on a port-by-port basis and insures that
only selected machines can transmit through the port. Before enabling
security, make sure the sources allowed to transmit through the port
have been previously defined on the static MAC address table.
♦
100Mbps
This parameter determines the transmission speed of the
selected port, either 100Mbps (100BASE-TX) or 10Mbps (10BASE-T).
♦
Full Duplex
Set this parameter to choose whether the port is operating
in half-duplex or full-duplex mode. In half-duplex mode, ports can
either send or receive data, while in full-duplex mode ports can send
and receive data at the same time.
♦
Nway
Enabling this allows the port to take advantage of Nway Auto-
Negotiation technology on a port-by-port basis on dual-speed devices.
If Nway is implemented on a port it will automatically sense the
connection speed (10 or 100 Mbps) and duplex mode (full or half) of
any device connected to that port. Nway will establish the connection
at the highest speed attainable by both devices and will use full duplex
transmission if both devices have this capability.
♦
Port Enable
Specific ports on the switch can be enabled or disabled,
cutting off the connected ports from the rest of the network. Disabling
a port may be necessary for testing purposes, or if the connected node is
causing excessive errors due to a hardware or software problem.
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