The Connectivity Standards Alliance (CSA) has opened its product certification programme for Suzi, the sub-GHz connectivity version of Zigbee.

This milestone marks a step forward in enabling the industry to bring standardised long-range, low-power and interoperable IoT products to market, backed by the Zigbee ecosystem.

Zigbee has long been the foundation of reliable, secure and low-power mesh networking. With the addition of Suzi, the technology evolves into a platform designed for larger, more complex and more demanding IoT deployments. Suzi is a sub-GHz extension that expands Zigbee’s capabilities beyond the traditional 2.4GHz band, unlocking longer range and better wall penetration, improved resilience in dense or challenging RF environments, and lower interference and more reliable communication.

Operating in sub-GHz frequency bands, such as 800MHz in Europe and 900MHz in North America, Suzi enables connectivity across buildings, campuses, outdoor spaces and industrial environments where traditional options fall short.

Built on the proven Zigbee network layer, Suzi combines mesh networking, low power consumption and multi-vendor interoperability, delivering robust performance across residential, commercial and industrial use cases.

Suzi is not just about range; it’s about reliability at scale. By extending Zigbee’s mesh architecture into sub-GHz frequencies, Suzi enables: large-scale mesh networks with improved stability and message delivery; consistent performance across complex environments such as multi-floor buildings, outdoor installations and industrial sites; and reduced infrastructure requirements, thanks to the need for fewer repeaters.

In combination with Zigbee 4.0’s enhancements in security, onboarding and lifecycle management, Suzi helps simplify deployment while strengthening network performance and resilience.

The launch of the Suzi product certification programme opens the door for manufacturers to bring interoperable Zigbee sub-GHz devices to market with confidence. Certification ensures that products meet strict interoperability requirements across vendors, adhere to robust security standards aligned with global best practices, and deliver consistent, reliable performance in real-world deployments.

This programme builds on the CSA’s proven certification framework, which has supported a global ecosystem of billions of Zigbee devices. By certifying Suzi-enabled products, manufacturers can accelerate time to market while ensuring compatibility within a trusted, standards-based ecosystem.

Suzi is not a replacement for Zigbee’s 2.4GHz operation but an extension. The technology is designed to work alongside existing Zigbee networks, allowing developers and operators to choose the right frequency band based on deployment needs. This dual-band flexibility enables optimised network design without sacrificing interoperability or requiring a complete system overhaul.

A key enabler of this flexibility is Zigbee’s support for bridge devices operating across both 2.4GHz and sub-GHz radios. These bridges allow seamless communication between existing and extended-range networks, gradual expansion of existing deployments, and preservation of compatibility with already installed Zigbee devices.

For manufacturers, this approach lowers the barrier to adoption. Devices that already support sub-GHz radios can enable Suzi functionality without extensive hardware redesign, making it easier to expand capabilities while protecting prior investments.

Zigbee 4.0 and Suzi together represent a step forward in the evolution of IoT connectivity, combining enhanced security and simplified commissioning, backwards compatibility with existing Zigbee deployments, and extended range through sub-GHz innovation

This unified approach allows developers and manufacturers to build products capable of scaling from the smart home to the smart city without compromising on reliability or interoperability. 

Download the Suzi one-pager (csa-iot.org/wp-content/uploads/2026/08/Intro-to-Suzi.pdf) or watch the video (csa-iot.org/newsroom/intro-to-suzi/). To learn more about the certification process and policy, visit csa-iot.org/certification/why-certify/.