802.11g data that will be sent during the duration. Client B also hears the RTS and decides
to send a CTS (Step 3).
In Step 4, shown in Figure 6-5, Client B sends a CTS back to Client A. Client C hears the
CTS in Step 5.
In Step 6, Figure 6-6, Client A sends data to Client B at 802.11g speeds. The 802.11b client
(Client C) cannot hear the data that it perceived as noise, but it still waits the duration seen
in the RTS/CTS before sending data.
This protection mechanism works well because the 802.11b client can hear the RTS and
the CTS no matter which client he is closest to. Another protection mechanism exists,
1
Because the AP
says to use protection,
Beacon:
I’ll use an RTS at
Non-ERP Present: Yes
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