negotiation so that the port can automatically judge the connection type of the device connected to it and
automatically adjust the connection type to ensure the maximum compatibility.
Flow Control
Flow control is used to prevent the frames from discard while port is blocked. This method is to send back
the blocking signal to its original address while sending or receiving buffer area start to overflow. It limits the
abnormal flows into a certain range. Flow control can be effective in preventing large amounts of data in the
network instant impact on the network to ensure the efficient and stable user network running.
There are two types of flow control:
1.
In the half duplex mode, flow control is through back pressure. It is to send a jamming signal to the transmission
source to reduce transmission speed.
2.
In the full duplex mode, flow control generally follow IEEE 802.3x standard. Switch sends "pause" to information
source to pause its sending information.
Polarity ( MDI/MDIX auto-negotiation)
MDI-II (Medium Dependent Interface- II mode), is a kind of standard built by IEEE for RJ-45 UTP cable of fast
Ethernet 100BASE-T. II stands for parallel configuration. MDI-X(Media Dependent Interface-x mode). MDI- II
is a kind of standard built by IEEE for RJ-45 UTP cable of fast Ethernet 100BASE-T. X stands for crossover
configuration.
Bandwidth Management
The device provides port based speed limitation, including ingress and egress limitation. User can limits
communication flow of each port and quits the flow limitation of the port. User can choose a settled speed,
the range is: 64Kbps ~ 100Mbps. The type of port limitation includes all unicast, multicast and broadcast.
When the port speed reaches the appointed speed, the device will enable or disable flow to limit the
transmitting speed or receiving speed by flow control or discard the message.
Configuring the System
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