
User manual
Port Enable
This item provides a device to enable/disable the port. When choosing disable, the device would cut off
power supply of this port. Even if other device is connected to this port, all status indicators of this port are OFF.
Only enable this port, all settings about this port will be valid. This item provides a kind of safety mechanism to
protect the port from illegal use. It is not allowed to disable all the ports.
Duplx Mode
Full duplex of the switch means switch can transmit and receive data at the same time. Half duplex of the
switch means switch can transmit or receive data in a certain time. Generally the speed will choose auto-
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.
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.
Use flow control to control the data flow between the sending and receiving nodes, can prevent packet
loss.
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)
与
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.
6.3.2 Bandwidth Management
Bandwidth management mainly refers to limit the data’s egress and ingress bandwidth to save the
network sources.
Click [port setting/bandwidth management] and enter into the following interface.
Egress Bandwidth Configuration:
“No limit” stands for no limitation for the speed, the others are corresponding speed.
As shown in following figure 6.3.2, the forcible egress rate of Port 5 is 8Mbps. Only need to select
8Mbps in egress rate setting of Port 5. The bandwidth of Port 5 as receiver is still 100Mbps, but the forcible egress
bandwidth of Port 5 is 8Mbps.