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OCR: COLLISION AVOIDANCE FRAME FORMATS RTS [Request to Sond) frame format Octets: 2 2 6 Frame control Duration Receiver Transmitter Cychou address _ address redundancy CHECK MAC header CTS (Clear to send) Frame Format Octets :. Framce Receiver Cyclic control Duration address redundancy check MAC header Figure 2. Unlike Ethernet, which includes a Collision Detection (CD) feature. WIANs use Collision Avoidance (CA). Before sending packets, the sending station transmits a Request to Send (RTSi; the destination station then sends a Clear to Send (CTS) packet. Only when this occurs will the medium be reserved for the duration of the