How is ZigBee addressing interference and coexistence in the 2.4GHz band?
• ZigBee-based products can access up to 16 separate, 5MHz channels in the 2.4GHz band, several of which do not overlap with US and European versions of IEEE 802.11 or Wi-Fi(tm). ZigBee incorporates an IEEE 802.15.4 defined CSMA-CA protocol that reduces the probability of interfering with other users and automatic retransmission of data ensures robustness. • The duty cycle of a ZigBee-compliant device is usually extremely low, meaning relatively very few packet data units are transmitted, reducing the likelihood of an unsuccessful transmission. • How is ZigBee addressing reliability? ZigBee was designed for the hostile RF environments that routinely exist in mainstream commercial and industrial applications. Utilizing Direct Sequence Spread Spectrum with features including collision avoidance, receiver energy detection, link quality indication, clear channel assessment, acknowledgement, security, support for guaranteed time slots and packet freshness; ZigBee-compliant networks offer OE
