S the, Beacon, Interval be – USRobotics Instant802 APSDK User Manual
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Professional Access Point
Administrator Guide
Glossary - 306
Beacon
Beacon frames announce the existence of the wireless local area network and enable stations to establish
and maintain communications in an orderly fashion. A beacon frame carries the following information,
some of which is optional:
•
The Timestamp is used by stations to update their local clock, enabling synchronization among all
associated stations.
•
The Beacon interval defines the amount of time between transmitting beacon frames. Before entering
power save mode, a station needs the beacon interval to know when to wake up to receive the bea-
con.
•
The Capability Information lists requirements of stations that want to join the
. For example, it
indicates that all stations must use
.
•
The Service Set Identifier (
).
•
is a bitmap that lists the rates that the
supports.
•
The optional Parameter Sets indicates features of the specific signaling methods in use (such as fre-
quency hopping spread spectrum, direct sequence spread spectrum, etc.).
•
The optional Traffic Indication Map (TIM) identifies stations, using power saving mode, that have data
frames queued for them.
Bridge
A connection between two local area networks (
s) using the same protocol, such as Ethernet or
Broadcast
A Broadcast sends the same message at the same time to everyone. In wireless networks, broadcast
usually refers to an interaction in which the access point sends data traffic in the form of
s to all client stations on the network.
Some wireless security modes distinguish between how unicast, multicast, and broadcast frames are
encrypted or whether they are encrypted.
and
.
Broadcast Address
.
BSS
A basic service set (BSS) is an
with a single access
point. Also see extended service set (
) and independent basic service set (
).