PLANET EPL-2000 - Manual (Page 78)

User’s Manual of EPL-2000
5. EPL-2000 OPERATION
5.1 Address Table
The OLT switch is implemented with an address table. This address table os composed of many entries. Each entry is used to
store the address information on some nodes on the network, including MAC address, port number, etc.
5.2 Learning
When one packet comes in from any port, the OLT Switch will record the source address, port number, and other related
information in the address table. This information will be used to decide either forwarding or filtering for future packets.
5.3 Forwarding & Filtering
When one packet comes from some port of the Ethernet Switching, it will also check the destination address besides the source
address learning. The OLT Switch will look up the address table for the destination address. If not found, this packet will be
forwarded to all the other ports except the port, which this packet comes in. And these ports will transmit this packet to the
network it connected. If found, and the destination address is located at a different port from this packet comes in, the OLT
Switch will forward this packet to the port where this destination address is located according to the information from the
address table. But, if the destination address is located at the same port with this packet that comes in, then this packet will be
filtered, thereby increasing the network throughput and availability
5.4 Auto-Negotiation
The STP ports on the Switch have built-in "Auto-negotiation". This technology automatically sets the best possible bandwidth
when a connection is established with another network device (usually at Power On or Reset). This is done by detecting the
modes and speeds at the second of both devices are connected and capable of. Both 10BASE-T and 100BASE-TX devices can
connect with the port in either Half- or Full-Duplex mode.
If attached device is: 100Base-TX port will set to:
10Mbps, no auto-negotiation 10Mbps.
10Mbps, with auto-negotiation 10/20Mbps (10BASE-T/Full-Duplex)
100Mbps, no auto-negotiation 100Mbps
100Mbps, with auto-negotiation 100/200Mbps (100BASE-TX/Full-Duplex)
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