Beacon frame is one of the management frames in IEEE 802.11 based WLANs. It contains all the information about the network. Beacon frames are transmitted periodically, they serve to announce the presence of a wireless LAN and to synchronise the members of the service set.

How often are beacon frames sent?

You often hear that Beacon frames are sent, by default, every 100 milliseconds (ms); however, the reality is a bit more complex. Beacons are sent by the AP at a regular interval defined as the Target Beacon Transmission Time (TBTT). The TBTT is a time interval measured in time units (TUs).

What is Beacon frame in Wireshark?

Beacon frames are used by the access points (and stations in an IBSS) to communicate throughout the serviced area the characteristics of the connection offered to the cell members. This information used by clients trying to connect to the network as well as clients already associated to the BSS.