Planet FSD-401SC, Manual

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FSD-401 User's Manual 11
device like repeater hub, switch or workstations. Be noted for the
duplex mode. For Hub, only Half-Duplex mode can be selected, at the
mean time, the cable distance cannot exceed 412 meters. For Switch or
end-node, the maximum distance cannot exceed 2 kilometers. The pair
of the connectors must be crossed, i.e. TX/RX port of the Switch
should connect to RX/TX port of the device in other end.
Figure 5. Fast Ethernet fiber-optic connection
Switch Operation
Address Table
The Switch is implemented with an address table. This address table
composed of many entries. Each entry is used to store the address
information of some node in network, including MAC address, port no,
etc. The information comes from the learning process of Ethernet
Switch.
Learning
When one packet comes in from any port. The Ethernet Switch will
record the source address, port no. and the other related information in
address table. These information will be used to decide either
forwarding or filtering for future packets.
Forwarding & Filtering
When one packet comes from some port of the Ethernet Switch, it will
also check the destination address besides the source address learning.