{"id":3615,"date":"2026-05-12T08:03:11","date_gmt":"2026-05-12T08:03:11","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/what-is-ieee-8023bm-40g-100g-ethernet-standards\/"},"modified":"2026-05-26T06:39:42","modified_gmt":"2026-05-26T06:39:42","slug":"what-is-ieee-8023bm-40g-100g-ethernet-standards","status":"publish","type":"post","link":"https:\/\/lp.szlogic.cn\/ru\/knowledge-center\/what-is-ieee-8023bm-40g-100g-ethernet-standards","title":{"rendered":"What Is IEEE 802.3bm? | A Complete Guide to 40G\/100G Ethernet Standards"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/e507108df14b489e9d70094013b070f7.webp\" alt=\"What Is IEEE 802.3bm?\" class=\"wp-image-3611\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/e507108df14b489e9d70094013b070f7.webp 1200w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/e507108df14b489e9d70094013b070f7-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/e507108df14b489e9d70094013b070f7-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/e507108df14b489e9d70094013b070f7-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/e507108df14b489e9d70094013b070f7-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As global data traffic continues to grow\u2014driven by cloud computing, AI workloads, hyperscale data centers, and high-performance computing\u2014the demand for faster and more efficient Ethernet standards has never been greater. <strong>IEEE 802.3bm<\/strong> is one of the key milestones in this evolution. Completed in 2015, the standard defines a new set of <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/what-is-phy-physical-layer-basics-explained\">physical layer (PHY) <\/a>specifications that enable more scalable <strong>40-Gigabit Ethernet (40GbE)<\/strong> and <strong>100-Gigabit Ethernet (100GbE)<\/strong> deployments across modern data center and enterprise infrastructures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This article explains what IEEE 802.3bm is, why it matters, and how it shapes today\u2019s high-speed optical module ecosystem.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39 <\/strong>Overview: What Is IEEE 802.3bm?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>IEEE 802.3bm<\/strong> is an amendment to the <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/ieee-802-3-ethernet-standard-explained\">IEEE 802.3 Ethernet standard<\/a> that introduces enhanced PHY definitions for 40G and 100G Ethernet links.<br>It primarily focuses on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>New optical interface specifications<\/strong><\/p><\/li>\n\n\n\n<li><p><strong>More efficient electrical signaling<\/strong><\/p><\/li>\n\n\n\n<li><p><strong>Support for multi-lane architectures using 25 Gbps SerDes<\/strong><\/p><\/li>\n\n\n\n<li><p><strong>Compatibility with next-generation QSFP28 and related form factors<\/strong><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In short, IEEE 802.3bm bridges the gap between earlier 40G\/100G solutions and the modern Ethernet ecosystem, which is built on 25G-based technologies.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39 <\/strong>Key Technical Highlights of IEEE 802.3bm<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"608\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c1d9a64ea6aa4cd2bb285a5673ab89a3-1024x608.webp\" alt=\"Overview: What Is IEEE 802.3bm?\" class=\"wp-image-3612\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c1d9a64ea6aa4cd2bb285a5673ab89a3-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c1d9a64ea6aa4cd2bb285a5673ab89a3-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c1d9a64ea6aa4cd2bb285a5673ab89a3-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c1d9a64ea6aa4cd2bb285a5673ab89a3-18x12.webp 18w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c1d9a64ea6aa4cd2bb285a5673ab89a3.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">1. Multi-Lane 4\u00d725Gbps Architecture<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most important innovations is the move from <strong>10\u00d710Gbps<\/strong> to <strong>4\u00d725Gbps<\/strong> signaling for 100G links. This improvement brings:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Lower power consumption<\/p><\/li>\n\n\n\n<li><p>Higher density<\/p><\/li>\n\n\n\n<li><p>Better signal integrity<\/p><\/li>\n\n\n\n<li><p>Compatibility with future 25G\/50G\/200G\/400G standards<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This architectural shift is foundational to today\u2019s <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\"><strong>QSFP28<\/strong><\/a>, <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28.htm\"><strong>SFP28<\/strong><\/a>, and <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/473139.htm\"><strong>QSFP56<\/strong><\/a> product families.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. New PHY Types for MMF and SMF<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IEEE 802.3bm introduces several new PHY interface standards supporting various media types:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 228px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"228\"><p>PHY Type<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Description<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Fiber Type<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"228\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/473115.htm\"><strong>100GBASE-SR4<\/strong><\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>100G over 4\u00d725G parallel channels<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>MMF (OM3\/OM4)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"228\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/488452.htm\"><strong>100GBASE-LR4<\/strong><\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>QSFP28 Dual Rate up to 10 km<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>SMF<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"228\"><p><strong>100GBASE-CR4<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>100G over 4\u00d725G twinax copper<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>DAC<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"228\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/482749.htm\"><strong>40GBASE-SR4<\/strong><\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>40G over 4\u00d710G MMF lanes<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>MMF<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"228\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/491452.htm\"><strong>100GBASE-ER4<\/strong><\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Long-reach variant (up to 40 km)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>SMF<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These interfaces form the basis of widely adopted <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\">QSFP28 modules<\/a> used in data centers today.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Reduced Latency and Improved Signal Encoding<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The standard optimizes encoding mechanisms and electrical specifications, resulting in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Lower latency on high-bandwidth links<\/p><\/li>\n\n\n\n<li><p>Higher overall transmission efficiency<\/p><\/li>\n\n\n\n<li><p>Better support for dense switch architectures<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Backward Compatibility With Existing Ethernet Layers<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Even with major improvements, 802.3bm maintains compatibility with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a href=\"https:\/\/resources.l-p.com\/knowledge-center\/what-are-ethernet-mac-and-phy\" target=\"_blank\" rel=\"\">Ethernet MAC layers<\/a><\/p><\/li>\n\n\n\n<li><p>Existing network protocols<\/p><\/li>\n\n\n\n<li><p>Legacy 10G\/40G deployments (where applicable)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This ensures a seamless migration path for network operators.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39 <\/strong>Why IEEE 802.3bm Matters Today<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Although newer standards such as IEEE 802.3bs (200G\/400G) and IEEE 802.3cd (50\/100\/200G PAM4) have emerged, IEEE 802.3bm remains essential because:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2713 It forms the foundation of the global 100G Ethernet ecosystem<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Most <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/473115.htm\"><strong>QSFP28 SR4<\/strong><\/a><strong> \/ <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/488452.htm\"><strong>LR4<\/strong><\/a><strong> \/ <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/472577.htm\"><strong>CWDM4<\/strong><\/a><strong> \/ PSM4<\/strong> modules originate from 802.3bm PHY definitions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2713 It enables high-density Top-of-Rack and Spine\/Leaf networks<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modern cloud data centers still rely heavily on 100G Ethernet switches based on this standard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2713 It supports cost-effective migration from 10G\/40G to 100G<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Many enterprises choose <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\">100G QSFP28 solutions<\/a> because they remain affordable and widely compatible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39 <\/strong>Typical Applications of IEEE 802.3bm<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Data center spine\u2013leaf interconnects<\/strong><\/p><\/li>\n\n\n\n<li><p><strong>Cloud service providers (AWS, Google Cloud, Azure)<\/strong><\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/resources.l-p.com\/glossary\/what-is-hpc-high-performance-computing\" target=\"_blank\" rel=\"\"><strong>High-performance computing (HPC)<\/strong><\/a><strong> clusters<\/strong><\/p><\/li>\n\n\n\n<li><p><strong>Metro and access network aggregation<\/strong><\/p><\/li>\n\n\n\n<li><p><strong>AI training clusters requiring high-bandwidth fabrics<\/strong><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">From short-reach multi-mode SR4 links to long-reach LR4 deployments, 802.3bm covers the full range of 100G optical connectivity needs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39 <\/strong>How IEEE 802.3bm Influences Future Ethernet Standards<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The shift to 25G electrical lanes in 802.3bm directly enabled:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a href=\"https:\/\/resources.l-p.com\/knowledge-center\/25gbase-ieee-802-3by-single-lane-25gbe-standard\" target=\"_blank\" rel=\"\"><strong>IEEE 802.3by (25GbE)<\/strong><\/a><\/p><\/li>\n\n\n\n<li><p><strong>IEEE 802.3bs (200G\/400G Ethernet)<\/strong><\/p><\/li>\n\n\n\n<li><p><strong>IEEE 802.3cd (50G\/100G\/200G PAM4)<\/strong><\/p><\/li>\n\n\n\n<li><p>The universal adoption of <strong>SerDes lane scaling<\/strong> (25G \u2192 50G \u2192 100G)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In other words, 802.3bm created the building blocks for all subsequent generations of Ethernet speeds.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\ud83d\udd39 <\/strong>Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>IEEE 802.3bm<\/strong> is more than an incremental standard\u2014it is the architectural foundation of modern high-speed Ethernet. By defining 4\u00d725Gbps signaling, multi-lane fiber interfaces, and high-efficiency electrical specifications, it enabled cost-effective and scalable 40G\/100G deployments across global data centers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you are selecting<a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26153-40g-qsfp.htm\"><strong> 40G QSFP+<\/strong><\/a> and <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\"><strong>QSFP28 modules<\/strong><\/a>, planning a 100G spine-leaf upgrade, or designing next-generation switching platforms, understanding IEEE 802.3bm provides essential insight into how today\u2019s optical networks operate.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"608\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/10c95f6257c242d6aea0ce40fc2fe047-1024x608.webp\" alt=\"40G QSFP+ Transceivers\" class=\"wp-image-3613\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/10c95f6257c242d6aea0ce40fc2fe047-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/10c95f6257c242d6aea0ce40fc2fe047-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/10c95f6257c242d6aea0ce40fc2fe047-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/10c95f6257c242d6aea0ce40fc2fe047-18x12.webp 18w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/10c95f6257c242d6aea0ce40fc2fe047.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>","protected":false},"excerpt":{"rendered":"<p>Learn what IEEE 802.3bm is and how it defines the key PHY interfaces for 40G and 100G Ethernet. Explore SR4, LR4, CR4 technologies and why this standard powers modern data centers.<\/p>","protected":false},"author":1,"featured_media":3614,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[13,18,24],"class_list":["post-3615","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-center","tag-100g-modules","tag-40g-qsfp-transceivers","tag-link-pp"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/3615","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/comments?post=3615"}],"version-history":[{"count":2,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/3615\/revisions"}],"predecessor-version":[{"id":8029,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/3615\/revisions\/8029"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media\/3614"}],"wp:attachment":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media?parent=3615"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/categories?post=3615"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/tags?post=3615"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}