{"id":4746,"date":"2026-05-13T06:32:49","date_gmt":"2026-05-13T06:32:49","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/what-is-ieee-802-3-bt-poe-standard\/"},"modified":"2026-05-25T10:23:45","modified_gmt":"2026-05-25T10:23:45","slug":"what-is-ieee-802-3-bt-poe-standard","status":"publish","type":"post","link":"https:\/\/lp.szlogic.cn\/ru\/knowledge-center\/what-is-ieee-802-3-bt-poe-standard","title":{"rendered":"IEEE 802.3bt (PoE++) Standard Explained: Up to 100W Power over Ethernet"},"content":{"rendered":"
\"What<\/figure>\n\n\n\n

➡️ <\/strong>Introduction: The Evolution of PoE<\/h2>\n\n\n\n

The IEEE 802.3bt standard<\/strong>, often called PoE++<\/strong> or 4-Pair PoE<\/strong>, represents the latest evolution in Power over Ethernet (PoE)<\/strong><\/a> technology. Officially ratified in September 2018<\/strong>, IEEE 802.3bt expands the power capability of Ethernet connections to meet the growing demands of high-performance devices such as 4K PTZ cameras, Wi-Fi 6\/6E access points<\/a>, and thin clients.<\/p>\n\n\n\n

By enabling up to 100 watts of power delivery<\/strong> over standard twisted-pair Ethernet cabling, IEEE 802.3bt has become a cornerstone for next-generation enterprise, industrial, and IoT networks.<\/p>\n\n\n\n

➡️ <\/strong>Power Classes and Types Defined by IEEE 802.3bt<\/h2>\n\n\n\n

The 802.3bt standard introduces two new power types<\/strong>\u2014Type 3<\/strong> and Type 4<\/strong>\u2014that significantly extend the capabilities of earlier PoE (802.3af) and PoE+ (802.3at) systems.<\/p>\n\n\n\n

\n\n<\/colgroup>

Standard<\/p><\/th>

Common Name<\/p><\/th>

Power Source (PSE)<\/p><\/th>

Device Power (PD)<\/p><\/th>

Cable Pairs Used<\/p><\/th><\/tr>

IEEE 802.3af<\/a><\/p><\/td>

PoE<\/p><\/td>

15.4 W<\/p><\/td>

12.95 W<\/p><\/td>

2 pairs<\/p><\/td><\/tr>

IEEE 802.3at<\/a><\/p><\/td>

PoE+<\/p><\/td>

30 W<\/p><\/td>

25.5 W<\/p><\/td>

2 pairs<\/p><\/td><\/tr>

IEEE 802.3bt Type 3<\/strong><\/p><\/td>

PoE++<\/strong><\/p><\/td>

60 W<\/strong><\/p><\/td>

51 W<\/strong><\/p><\/td>

4 pairs<\/strong><\/p><\/td><\/tr>

IEEE 802.3bt Type 4<\/strong><\/p><\/td>

High-Power PoE++<\/strong><\/p><\/td>

100 W<\/strong><\/p><\/td>

71\u201390 W<\/strong><\/p><\/td>

4 pairs<\/strong><\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n

Key Enhancements<\/h3>\n\n\n\n