China's First Household PLC Standard Released and BST's contribution

A Landmark Standard for a Connected Future A significant milestone was achieved for the smart home industry in China with the official release of the group standard T/ZSA 319—2025: General Technical Requirements and Testing Methods for Household Power Line Communication (PLC) Equipment.

This standard, officially implemented on December 4, 2025, fills a critical gap. For years, the household PLC market has operated without a unified technical baseline, leading to inconsistent product quality and performance concerns. T/ZSA 319—2025 changes this by establishing a comprehensive framework for product design, manufacturing, and testing. It marks a decisive step towards industry-wide standardization, promising enhanced reliability, interoperability, and safety for consumers and manufacturers alike.

Beijing Shenzhou Tech (BST): Act as the primary author of the document. This role positioned BST at the core of the drafting process, translating industry expertise and technical consensus into a precise and actionable specification. BST's leadership ensured that the standard is both rigorous and practical, addressing real-world engineering challenges faced by the global PLC community.

A Deep Dive of Core Value and Technical Innovations: The standard's significance lies in its sophisticated approach to long-standing technical hurdles.

1. Pioneering Solutions for EMC Testing Challenges PLC devices present a unique electromagnetic compatibility (EMC) testing problem: how to accurately measure disturbances from the communication signal on the same line as the AC power. Traditional methods fell short. A key innovation in this standard is a novel testing methodology that specifies a specialized setup to effectively separate the PLC signal from the power line. This allows for accurate and repeatable measurement of conducted emissions, solving a fundamental industry pain point and setting a new benchmark for EMC compliance verification.

2. Comprehensive Technical Requirements for Reliability Moving beyond EMC, the standard establishes a robust set of requirements to ensure devices are reliable and user-friendly. BST was central to defining these specifications, which include:

• Environmental Resilience: Devices must operate stably in a wide range of temperatures (-5°C to 45°C).
• Interoperability: Mandating support for mainstream interfaces (Ethernet, USB) and protocols (HomePlug, IEEE 1901).
• Spectrum Coexistence: It introduces a sophisticated "Frequency Notching" mechanism, requiring devices to automatically avoid transmitting on protected radio frequencies (e.g., for aviation and broadcasting), ensuring intelligent coexistence with critical wireless services.

Conclusion The release of T/ZSA 319—2025 is a testament to the maturity of China's PLC industry. It provides a clear path for high-quality development and innovation. BST is proud to have contributed its technical expertise as the primary author, helping to create a standard that benefits the entire global ecosystem - from manufacturers to end-users. This initiative underscores BST's commitment to advancing technology through collaboration and leadership.

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