2. Standards
  3. ANSI/CTA 709.8 LON HD-PLC



In 2017 LonMark International adopted HD-PLC as the new channel standard for high-speed wireline networks. Using IP-based communications HD-PLC provides LON systems with an instant speed upgrade- from just kilobits to megabits-without needing to add or replace wiring.
The new standard ANSI/CTA 709.8 LON HD-PLC (High Definition Power Line Communication) was approved In February 2020 as a new American National Standard (ANS) by the American National Standards Institute (ANSI) standards.


The new LON HD-PLC standard enables native LON communication over any IP transport such as Ethernet and Wi-Fi, as well as interoperability with IP-based web services so that building and industrial automation systems can seamlessly and securely interoperate with cloud and IoT applications.

LON HD-PLC platform implements an Ethernet-like transmission, wherein devices act as an Ethernet gateway in parallel, enabling double use for all IP-based solutions. It creates a single control system to aggregate data and detects hidden faults in HVAC operations. Plus, IP networks can be used as a native network medium for LonWorks, so the use of LonWorks/IP-only devices is also possible.

HD-PLC Implementation

Using IP-based communications (IPv4 or IPv6 multicasting), HD-PLC provides LON systems with an instant speed upgrade- from just kilobits to megabits-without needing to add or replace wiring. Especially designed for building automation, IPv6 provides a cost-effective transport mechanism for complex control systems to communicate with devices.

Compared to the conventional low-speed PLC, HD-PLC enables high-speed communication and can cover a range of several kilometers with the multi-hop function. Thus, it can increase the speed and the coverage of conventional LonMark compatible systems. In addition, it can reduce the need for new communication wiring work by using existing lines such as double wires, twisted pairs, coaxial cables, and telephone lines, as well as power lines.

Market Implications

With this transformative wireline communication technology, manufacturers can effectively build a robust infrastructure into buildings today, ensuring the future-readiness for intelligent HVAC of tomorrow.

It is expected that high-speed communication LonMark compatible systems will replace conventional LonMark in indoor equipment controls of buildings and factories and outdoor equipment controls such as smart street lighting and lighting systems that use double-wire communication.

*Text: HD-PLC Alliance and Megachips Corporation


ANSI/CTA 709.8-2020
Title: Open Data Communication in Building Automation, Controls and Building Management – Control Network Protocol Specification – Part 8: Control Network Protocol/High Definition Power Line Channel Specification (CNP/HD-PLC)
New standard: Feb 6, 2020

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