32 n COMMUNICATIONS AND NETWORKING June 2026 www.drivesncontrols.com Using high-power PoE to drive edge devices High-Power PoE (Power-overEthernet) is the power infrastructure that the intelligent edge has been waiting for. As factories automate and mission-critical networks push computing closer to the action, a single cable now needs to do it all: deliver the bandwidth and the wattage to keep pace with multi-sensor applications, advanced imaging, and real-time analytics. The High-Power PoE standard, IEEE 802.3bt, meets the demands of edge devices that don't just connect, they compute. Earlier PoE standards, IEEE 802.3af (15.4W) and 802.3at (30W), were not designed for AIenabled edge devices. Today’s IIoT sensors, Wi-Fi 6/7 APs (access points) and 4K/8K cameras frequently exceed 30–60W of power consumption, creating the need for a new standard supporting the next decade of power-hungry edge equipment. IEEE 802.3bt delivers up to 90–100W per port – enough to power AI-enhanced vision and inference modules. Industrial analytics systems need stable, uninterrupted power for real-time operation, while the standard’s backward compatibility makes scaling AI and IIoT deployments straightforward and future-ready. In short, High-Power PoE is a foundational element for industrial AI-ready networks. Earlier PoE standards were limited by available power, leaving them unable to meet the requirements of robotics, RFID readers, pan/tilt/zoom cameras and HD/4K displays. Power dissipation further constrained deployments. For instance, while an 802.3af PSE (power sourcing equipment) can supply 15.4W, the PD (powered device) receives only 12.95W. Table 1 shows the effective power a PD receives under different PoE standards. Defining power across classes The IEEE 802.3 framework defines PoE power levels across Classes 0 to 8, giving precise power budgeting and interoperability between PSEs and PDs. IEEE 802.3bt (Type 3/4) extends that range with Class 5–8 support while maintaining full backward compatibility with 802.3at/af. This way, mixed-generation devices coexist on the same network without compromise. IEEE 802.3bt introduces several enhancements that improve PoE predictability and efficiency: n Single- vs dual-signature PDs Singlesignature PDs use one classification circuit, while dual-signature PDs separate power to functional modules such as camera motors. n Connection check bt PoE can distinguish between these PD types, which af/at could not do. n Autoclass This allows a PSE to measure a PD’s actual power draw for more accurate budgeting in multi-port deployments. These enhancements improve system stability and enable more efficient use of available power resources. Key applications With up to 90W per port, High-Power PoE supports edge devices that previously needed local power sources: n Next-generation IIoT sensors with local processing, wireless modules, or multifunction capabilities can rely on bt PoE for stable, centralised power delivery. n Wi-Fi 6/7 access points often need 60W or more for sustained throughput – bt PoE supports stable operation without needing external power. n AI-enhanced and other cameras have motors and onboard AI modules that often need more than 30–60W – High Power PoE ensures full functionality via a single cable. n Smart buildings High-Power PoE can power advanced luminaires and control modules, while reducing standby consumption for improved energy efficiency. Deploying bt PoE requires careful evaluation of PD power requirements and switch power budgets. To ensure safe and predictable operation, the PSE and PD must both comply with IEEE 802.3bt Although many vendors advertise 802.3bt compatibility, some only support Type 3 (60W). Antaira provides full Type 3 and true Type 4 (90W) power across all of its industrial managed and unmanaged switches, injectors and media converters. They supply up to 100W per port for high-power PDs. To address practical challenges in field deployments, we also incorporate several patented mechanisms to improve operational robustness, including longdistance remote recovery, automatic adjustment of power budgets when input voltage varies, uninterrupted PoE during firmware upgrades, and controlled power-off to prevent arcing during cable removal. High-Power bt PoE delivering up to 90W dramatically expands what's deployable at the network edge. With four-pair powering, improved efficiency, and seamless backward compatibility, IEEE 802.3bt Type 4 has become a core enabler for modern industrial, IIoT and smart building infrastructures. n An enhanced version of the Power-over-Ethernet technology can be used to deliver up to 100W to edge devices on the same cable as communications. Henry Martel, a field application engineer at Antaira Technologies, explains how the system works. Table 1: The effective power received by devices under different PoE standards.
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