{"id":4582,"date":"2026-05-13T05:53:38","date_gmt":"2026-05-13T05:53:38","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/sfp28-msa-standard-for-25g-modules\/"},"modified":"2026-05-26T02:22:19","modified_gmt":"2026-05-26T02:22:19","slug":"sfp28-msa-standard-for-25g-modules","status":"publish","type":"post","link":"https:\/\/lp.szlogic.cn\/ru\/knowledge-center\/sfp28-msa-standard-for-25g-modules","title":{"rendered":"Explaining the SFP28 MSA Standard \u2014 Background, Purpose &#038; Practical Impact"},"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\/3cb5966bb6214bafa7f2bb922f8bf45f.webp\" alt=\"What Is the SFP28 MSA Standard\uff1f\" class=\"wp-image-4580\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3cb5966bb6214bafa7f2bb922f8bf45f.webp 1200w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3cb5966bb6214bafa7f2bb922f8bf45f-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3cb5966bb6214bafa7f2bb922f8bf45f-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3cb5966bb6214bafa7f2bb922f8bf45f-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/3cb5966bb6214bafa7f2bb922f8bf45f-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>1. Introduction<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>SFP28 (Small Form-factor Pluggable 28)<\/strong> is the industry-standard form factor for single-lane <strong>25 Gigabit Ethernet (25GbE)<\/strong> connections used in modern data centers, telecom networks, and industrial systems.<br\/>Behind its widespread adoption is the <strong>SFP28 MSA (Multi-Source Agreement)<\/strong> \u2014 an open industry specification that defines mechanical, electrical, and management parameters to ensure interoperability between modules and equipment from different vendors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This article explains the background and purpose of the SFP28 MSA standard, its relationship with IEEE Ethernet specifications, and how it benefits designers, integrators, and network operators.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>2. What Is an MSA and Why It Matters<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/multi-source-agreements-optical-transceivers\"><strong>MSA (Multi-Source Agreement)<\/strong><\/a> is a cooperative specification created by multiple manufacturers to ensure product compatibility across vendors.<br\/>While <strong>IEEE standards<\/strong> define protocol and signaling (for example, Ethernet data rates and encoding methods), MSAs focus on <strong>mechanical design, pin assignments, and electrical interfaces<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For optical transceivers like <strong>SFP28<\/strong>, the MSA defines:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Physical dimensions and latch mechanisms<\/p><\/li><li><p>Electrical pin functions and signal characteristics<\/p><\/li><li><p>Digital diagnostic monitoring (<a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/ddm-dom-in-optical-transceivers\">DDM\/DOM<\/a>)<\/p><\/li><li><p>Thermal and power specifications<\/p><\/li><li><p>Host and module communication protocols (via I\u00b2C interface)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Thanks to the MSA, <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28.htm\">SFP28 modules<\/a> from different manufacturers can be safely interchanged, ensuring <strong>cross-vendor interoperability<\/strong> and reducing integration complexity.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>3. Core Scope of the SFP28 MSA<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>SFP28 MSA<\/strong>, based primarily on the <strong>SFF-8402<\/strong> and related <strong>SFF-8431<\/strong> documents, specifies the following key areas:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 235px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"235\"><p>Category<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Description<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"235\"><p><strong>Form Factor<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Same size as SFP and SFP+ (56.5 mm \u00d7 13.4 mm \u00d7 8.5 mm), allowing drop-in mechanical compatibility.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"235\"><p><strong>Electrical Interface<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Supports up to 28 Gbps per lane; compliant with high-speed signal integrity requirements.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"235\"><p><strong>Management Interface<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Based on I\u00b2C (2-wire serial bus); supports DOM for temperature, voltage, and optical power.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"235\"><p><strong>Media Support<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Compatible with fiber (LC duplex) or copper (DAC\/AOC) connections.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"235\"><p><strong>Power and Thermal<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Optimized for higher bandwidth with efficient power consumption (typically \u2264 1.5 W).<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These parameters make <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28.htm\">SFP28<\/a> an evolution of SFP+ \u2014 capable of handling <strong>2.5\u00d7 the data rate<\/strong> without changing the physical footprint.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>4. Relationship with IEEE Standards<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While the <strong>SFP28 MSA<\/strong> defines form and interface, the <strong>IEEE 802.3by<\/strong> standard defines how 25 GbE signals are transmitted through fiber or copper.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 163px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"163\"><p>Standard<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Defines<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Examples<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"163\"><p><strong>IEEE 802.3by<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>25G Ethernet PHY and link protocols<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>25GBASE-SR, 25GBASE-LR<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"163\"><p><strong>SFF-8402<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>SFP28 mechanical\/electrical specifications<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Module shape, pinouts<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"163\"><p><strong>SFF-8431<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Signal integrity and electrical characteristics<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>High-speed lane specs<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"163\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/sfp-8472-standard-explained-ddm-for-optical-transceivers\"><strong>SFF-8472<\/strong><\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Digital diagnostic monitoring<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>DOM\/DDM registers<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Together, these ensure a fully defined, interoperable ecosystem for 25 GbE links.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>5. Compatibility and Upgrade Benefits<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28.htm\">SFP28 modules<\/a> are <strong>backward-compatible<\/strong> with SFP+ ports in many systems (at 10G speeds), making migration from 10G to 25G straightforward for data center and edge networks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key advantages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Interoperability:<\/strong> Mix-and-match modules and switches from multiple brands.<\/p><\/li><li><p><strong>Scalability:<\/strong> Upgrade existing SFP+ infrastructure to 25G without changing cages or connectors.<\/p><\/li><li><p><strong>Flexibility:<\/strong> Available in copper <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/dac-vs-aoc-differences-explained-for-modern-networks\">DAC, AOC<\/a>, and optical versions for different link distances.<\/p><\/li><li><p><strong>Reliability:<\/strong> Built-in DOM\/diagnostic monitoring enhances network health visibility.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>6. Importance for System Designers<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For equipment manufacturers and integrators, SFP28 MSA compliance offers:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Design predictability<\/strong> \u2014 consistent dimensions, thermal envelopes, and host interface design rules.<\/p><\/li><li><p><strong>Testing efficiency<\/strong> \u2014 standardized electrical and optical parameters reduce QA cycles.<\/p><\/li><li><p><strong>Vendor flexibility<\/strong> \u2014 second-source availability ensures component supply stability.<\/p><\/li><li><p><strong>Long-term scalability<\/strong> \u2014 seamless path from 10G to 25G and beyond (50G\/100G via <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\">QSFP family<\/a>).<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These benefits directly impact product reliability, lifecycle management, and interoperability certifications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>7. LINK-PP and MSA-Compliant SFP28 Modules<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LINK-PP provides a wide range of <strong>SFP and SFP28 transceiver modules<\/strong>, cages, and magnetic connectors fully compliant with MSA and IEEE standards.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#x1f449; Explore LINK-PP\u2019s product range:<br\/><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28.htm\"><strong>LINK-PP 25G SFP28 Transceivers<\/strong><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LINK-PP SFP28 modules feature:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Compliance with <strong>SFF-8402 \/ SFF-8431<\/strong> and <strong>IEEE 802.3by (25GBASE-SR\/LR)<\/strong><\/p><\/li><li><p><strong>Industrial temperature options<\/strong> for harsh environments<\/p><\/li><li><p><strong>Low-power and low-latency design<\/strong>, ideal for data center and telecom networks<\/p><\/li><li><p>Full <strong>Digital Diagnostic Monitoring (DDM)<\/strong> capability<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These MSA-compliant modules ensure reliable interoperability across diverse switch and router platforms.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>8. Summary<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>SFP28 MSA<\/strong> provides the physical and electrical foundation enabling 25 Gbps Ethernet in compact, hot-pluggable form factors.<br\/>By defining consistent mechanical and electrical interfaces, it guarantees interoperability, simplifies upgrades, and reduces integration risk across vendors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For businesses deploying 25G networks \u2014 from hyperscale data centers to industrial automation \u2014 choosing <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28.htm\"><strong>MSA-compliant SFP28 modules<\/strong><\/a>, like those from <strong>LINK-PP<\/strong>, ensures performance, compatibility, and long-term reliability.<\/p>","protected":false},"excerpt":{"rendered":"<p>Learn what the SFP28 MSA (Small Form-factor Pluggable 28 Multi-Source Agreement) defines, why it matters for 25G Ethernet, and how it ensures module interoperability.<\/p>","protected":false},"author":1,"featured_media":4581,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[16,24,26],"class_list":["post-4582","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-center","tag-link-pp-25g-sfp28-optical-modules","tag-link-pp","tag-optics-transceivers"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4582","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=4582"}],"version-history":[{"count":2,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4582\/revisions"}],"predecessor-version":[{"id":7795,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4582\/revisions\/7795"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media\/4581"}],"wp:attachment":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media?parent=4582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/categories?post=4582"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/tags?post=4582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}