AirLive WN-200USB - Manual (Page 46)

6. Network Glossary
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AirLive WN-200USB User’s Manual
Full Duplex
The ability of a networking device to receive and transmit data simultaneously. In wireless
environment, this is usually done with 2 or more radios doing load balancing.
Gateway
In the global Internet network, the gateways are core routers that connect networks in
different IP subnet together. In a LAN environment with an IP sharing router, the gateway
is the router. In an office environment, gateway typically is a multi-function device that
integrates NAT, firewall, bandwidth management, and other security functions.
GI
Guard Interval. It’s a measure to protect wireless devices from cross- interference. If there
are two wireless devices using the same or near channel, and they are close enough, radio
interference will occur and reduce the radio resource usability. In an OFDM system, the
length of the guard interval needs to be changed according to the environment to make
efficient use of the communication channels. In General, you will see SGI (Short Guard
Interval) or LGI (Long Interval Guard).
Hotspot
A place where you can access Wi-Fi service. The term hotspot has two meanings in
wireless deployment. One is the wireless infrastructure deployment, the other is the
Internet access billing system. In a hotspot system, a service provider typically need an
authentication and account system for billing purposes, and a wireless AP network to
provide access for customers.
IGMP Snooping
Internet Group Management Protocol. It is a Layer 3 protocol to report IP multicast
memberships to neighboring multicast switches and routers. IGMP Snooping is a feature
that allows an Ethernet Switch to “listen in” on the IGMP conversation between hosts and
routers. When IGMP snooping is enabled in a switch, it prevent hosts on a local network
from receiving traffic for a multicast group they have not explicitly joined. It provides
switches with a mechanism to prune multicast traffic from links that do not contain a
multicast listener (IGMP client).