
User manual
Page 18
100M uses 100Base-TX standard and UTP/STP cable for connection. When the port is in 100M
speed, Link/Act indicator will blink continuously while data transmitting. 100M fiber port uses 100Base-
FX standard and single/multi-mode fiber for connection. Main fiber of 100Base-FX standard includes:
62.5nm multi-mode fiber and 50nm multi-mode fiber.Auto-negotiation includes 2 kinds of speed
according the capability of the other end: 10M and 100M.
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) and 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:
“----” 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 4 is 8Mbps. Only need to select
8Mbps in egress rate setting of Port 4. The bandwidth of Port 4 as receiver is still 100Mbps, but the
forcible egress bandwidth of Port 4 is 8Mbps.