ZigBee and Z-Wave are two short-range wireless technologies. Both are good choices for home-area network (HAN) applications. But their technical specifications and applications are still different.
1. Alliance situation
The ZigBee Alliance is a consortium of companies and other organizations that support standards development and application promotion and currently has more than 220 members. Zigbee cooperates with the IEEE802.15.4 standard. The IEEE802.15.4 standard provides specifications for the first layer (physical layer, PHY) and the second layer (media access controller, MAC) of the network, while the Zigbee protocol stack software provides Specification of the network layer and the application layer.
The Z-Wave Alliance consists of 160 companies. Although Z-wave has actively joined the International Standards Organization and has more than 150 companies to join, its market appeal is far less than Zigbee.
2. Networking
In terms of connection topology, Z-Wave has only one topology, namely mesh. Mig, in addition to mesh topology, ZigBee also supports topologies such as Star and Tree. .
Both ZigBee and Z-wave have a coordinator node as the master node to coordinate and control other nodes. If two nodes cannot communicate directly because the communication distance is too far, then the nodes that can communicate with them can be theirs. Pass the communication signal and act as a repeater. The difference is that ZigBee can support 65,000 nodes, while the Z-Wave network supports up to 232 nodes.
3. Protocol complexity
ZigBee's protocol is more complex, and the development of the protocol layer is longer. Z-Wave uses a simpler protocol that is faster and easier to develop. At the same time, the ZigBee Alliance designed a set of application profiles to support the development and deployment of various applications. These application specifications include home automation, smart energy, communications, medical, remote control (RF4CE, RF for consumer electronics), building automation and retail services.
In all fairness, Z-Wave has targeted home automation applications since its inception, and ZigBee has been pursuing a broader application. Both have different considerations in the initial guiding ideology. Z-wave has always focused on home applications, and his target application areas are clearer, so the protocol structure is relatively simple. The ZigBee technology is positioned in a much wider field, and it is more natural than the Z-Wave.
4. Communication frequency, transmission rate
ZigBee devices can operate at frequencies of 2.4 GHz, 915 MHz, and 868 MHz. The 2.4 GHz band is typically used. In this band, ZigBee defines 16 frequency points, each of which is 5 MHz apart. Zigbee can use OQPSK or BPSK modulation. The data transmission rate is 250kbits/s, 40kbits/s and 20kbits/s depending on the communication frequency.
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