User manual
Page 52
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
（
DiffServe 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
Q
QoSQuality of Service
）
A technology to resolve the network delay and block problems
and so on.
T
Trunking
To make an aggregated group tied up a group of ports together
to increase bandwidth and improve the connection reliability.
ToS
（
Type of
Service
）
Packaged in IP packet header of 8 bit domain to perform the
different priority packets
U
UDP
（
User Datagram
Face to disconnected unreliable transmission layer protocol
