"Zigbee is a wireless communication protocol designed for low-power, low-data-rate applications such as smart homes, industrial monitoring and sensor networks. It allows devices to communicate reliably, securely and efficiently while consuming minimal energy enabling battery-powered devices to operate for years without replacement. Zigbee is built on the IEEE 802.15.4 standard which defines the Physical (PHY) and Medium Access Control (MAC) layers."
"The Physical Layer is responsible for transmitting raw data over the air as radio waves and receiving signals from other devices. It operates primarily in three frequency bands: 2.4 GHz worldwide, 915 MHz in the Americas, and 868 MHz in Europe. The 2.4 GHz band supports data rates up to 250 kbps while the sub-GHz bands provide lower rates suitable for longer range."
Zigbee is a wireless protocol for low-power, low-data-rate applications including smart homes, industrial monitoring, and sensor networks. The protocol enables reliable, secure, and energy-efficient communication that allows battery-powered devices to operate for years. Zigbee builds on IEEE 802.15.4 for the Physical and MAC layers and adds Network and Application layers to provide mesh networking, interoperability, and layered security. The Physical layer handles radio transmission across 2.4 GHz, 915 MHz, and 868 MHz bands, uses O-QPSK modulation with DSSS, supports up to 250 kbps on 2.4 GHz, and performs channel selection, power control, energy detection, and Clear Channel Assessment. The MAC layer packages data into frames, manages addressing, acknowledgments, and retransmissions, and supports unique 64-bit IEEE addresses and short 16-bit network addresses.
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