The Connectivity Standards Alliance (CSA) has opened its Product Certification Program for Suzi, Zigbee’s new sub-GHz extension.
The programme follows the Alliance’s earlier rollout of Zigbee 4.0 and gives device makers a formal route to certify sub-GHz hardware for interoperability, security, and performance. It covers products operating outside Zigbee’s established 2.4 GHz band, in frequencies such as 800 MHz in Europe and 900 MHz in North America.
The Alliance ties the launch to a wider goal of bringing standardised, long-range, low-power, and interoperable IoT products to market on the existing Zigbee ecosystem.
Extending beyond the 2.4 GHz band
Zigbee has operated as a low-power mesh networking standard built around the 2.4 GHz radio band that it shares with Wi-Fi and Bluetooth, and Suzi now adds a sub-GHz layer on top of that established network.
Operating below 1 GHz gives devices longer range and better penetration through walls; it also improves resilience in dense or challenging radio environments. Interference drops too, producing steadier communication.
The Alliance states that this combination lets Zigbee networks extend across buildings, campuses, outdoor sites, and industrial facilities where the 2.4 GHz band struggles to reach. Large-scale networks benefit from improved message-delivery stability across potentially multiple floors. Fewer repeaters are needed to cover the same ground, reducing infrastructure requirements.
Suzi sits on top of Zigbee’s existing network layer rather than replacing it. It combines the mesh routing, low power draw, and multi-vendor interoperability already associated with Zigbee, applied here to residential, commercial, and industrial deployments.
The Suzi Product Certification Program is designed to let manufacturers bring sub-GHz Zigbee devices to market with vendor interoperability confirmed rather than assumed, and certified products must first meet interoperability requirements across vendors. They must also meet security standards aligned with global best practices. The Alliance’s certification criteria further require consistent performance in real-world deployments.
The programme runs on the certification framework the Alliance already applies to standard Zigbee devices, which it says has supported a global ecosystem of billions of Zigbee devices worldwide. Extending that framework to Suzi-enabled hardware lets manufacturers bring products to market faster while keeping them compatible with the wider standards-based ecosystem.
Zigbee 4.0 and Suzi combined
Making both bands work together depends on bridge devices capable of operating across 2.4 GHz and sub-GHz radios simultaneously, and according to the Alliance, these bridges enable direct communication between existing networks and the extended-range sub-GHz networks that Suzi introduces. They support gradual expansion of installed deployments, too. Compatibility with Zigbee devices already in the field stays intact, the Alliance notes.
For manufacturers, this lowers adoption cost. Devices that already carry sub-GHz radios can add Suzi functionality without extensive hardware redesign, protecting earlier hardware investment and extending coverage.
The Alliance positions Zigbee 4.0 and Suzi together as one package, pairing security and commissioning improvements with backward compatibility for existing deployments and extended range from the sub-GHz layer.
The combination is meant to let developers and manufacturers build networks that scale from a single smart home installation up to a smart city deployment without losing reliability or cross-vendor interoperability.
See also: Anthropic standard lets AI agents run lab and factory hardware
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