User manual
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Appendix 1 Glossary table
Glossary
Description
A
ARP
(Address
Resolution Protocol)
An IP address to physical address protocol
Auto-Negotiation
Switches at both ends of the device in accordance with the
maximum performance to auto-negotiate the speed and duplex
mode
B
Broadcast Storm
A port send excessive broadcast frame meantime on the network,
accumulate the respond to send messages on the network ,
consume too much network resources or cause the network
timeout
Broadcasting
A forwarding way send data to all branch of network
C
CoS
（
Class of Service
）
namely 802.1p priority program, CoS offer a way for data packets
to join priority tag, classify packets into 8 level with the value 0~7
range
D
DHCP
（
Dynamic Host
Configuration Protocol
）
Information for the network to assign dynamically IP address,
subnet mask and gateway
DSCP
（
DiffServ Code
Point
）
Packaged in IP packet header of 6 bit domain, can classify
packets into 64 level with the value 0~63 range
E
Ethernet
Ethernet uses a bus or star-shaped topology and supports
transmission rates up to 10Mbps orders of magnitude. A new
version called fast Ethernet speeds of up to 100Mbps
F
Flow Control
Flow control allows low-rate devices communicate with high-rate,
the flow control can match high rate port contracting speed with
low rate port reception speed according to the way of high rate
port pause contract
Frame
Packets contain the header and tail message of physical media
layer
Full-Duplex
Receive and send data in progress at one moment meantime on
IEEE802.3x standard
H
Half-Duplex
Receive or send data in one direction at one moment in progress
on Backpressure standard.
I
IGMP
（
Internet Group
Management Protocol
）
Define the mechanism among hosts and three layers multicast
device to establish and maintain the relationship between
multicast group members.
IEEE 802.1p
Add the priority network traffic on MAC sub layer of data link layer.
IEEE 802.1q
Define the VLAN bridge operation. To manage ,define and
operate VLAN on the bridge LAN
