{"id":2514,"date":"2026-04-11T00:00:00","date_gmt":"2026-04-11T00:00:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/products\/cfp4-vs-qsfp28-differences-guide\/"},"modified":"2026-06-22T03:34:41","modified_gmt":"2026-06-22T03:34:41","slug":"cfp4-vs-qsfp28-differences-guide","status":"publish","type":"post","link":"https:\/\/resources.l-p.com\/ru\/products\/cfp4-vs-qsfp28-differences-guide","title":{"rendered":"CFP4 vs. QSFP28: Key Differences Explained in 100G Optics"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"628\" src=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9ba2c6ab8d894f88a55c668788bb17c9.jpg\" alt=\"CFP4 vs. QSFP28: Key Differences Explained in 100G Optics\" class=\"wp-image-2504\" srcset=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9ba2c6ab8d894f88a55c668788bb17c9.jpg 1200w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9ba2c6ab8d894f88a55c668788bb17c9-300x157.jpg 300w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9ba2c6ab8d894f88a55c668788bb17c9-1024x536.jpg 1024w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9ba2c6ab8d894f88a55c668788bb17c9-768x402.jpg 768w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9ba2c6ab8d894f88a55c668788bb17c9-18x9.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As 100G networks continue to scale across modern data centers and telecom infrastructure, choosing the right optical transceiver form factor has become a critical decision for engineers and procurement teams. Among the most frequently compared options, <strong>CFP4 vs. QSFP28<\/strong> stands out as a high-intent search query\u2014because both modules deliver 100G performance, yet differ significantly in design philosophy, efficiency, and long-term viability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At first glance, CFP4 and <a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/472118.htm\">QSFP28<\/a> may seem functionally similar: both support 100 Gigabit Ethernet and are widely used in high-speed optical communication. However, when you look deeper into <strong>size, power consumption, port density, and deployment scenarios<\/strong>, the differences become highly impactful\u2014especially in environments where scalability, energy efficiency, and rack space optimization are top priorities.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is exactly why professionals searching for <em>\u201cCFP4 vs. QSFP28\u201d<\/em> are not just looking for definitions\u2014they are trying to answer a much more practical question:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Which <a target=\"_self\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\">100G optical module<\/a> is the better choice for my network\u2014now and in the future?<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">In today\u2019s market, where hyperscale data centers and cloud infrastructure demand higher density and lower power per bit, QSFP28 has rapidly become the dominant standard. At the same time, CFP4 still exists in certain legacy telecom and long-haul deployments, creating a transitional landscape where both technologies may coexist.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide is designed to give you a clear, engineering-focused comparison of CFP4 vs. QSFP28, aligned with real-world deployment needs and industry trends. By the end of this article, you will:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Understand the core differences between CFP4 and QSFP28<\/p><\/li><li><p>Learn where each form factor still makes sense<\/p><\/li><li><p>Evaluate power, cost, and scalability trade-offs<\/p><\/li><li><p>Get a practical decision framework for upgrades or new deployments<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you&#8217;re planning a new 100G rollout, optimizing an existing network, or deciding whether to migrate away from CFP4, this article will help you make a confident, future-proof choice.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x23e9; What Are CFP4 and QSFP28?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before comparing CFP4 vs. QSFP28, it\u2019s important to clearly understand what each form factor is and why both exist in the 100G optical ecosystem.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3693dcd02c1247d6b283793ba1eb5204.jpg\" alt=\"What Are CFP4 and QSFP28?\" class=\"wp-image-2505\" srcset=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3693dcd02c1247d6b283793ba1eb5204.jpg 1200w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3693dcd02c1247d6b283793ba1eb5204-300x169.jpg 300w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3693dcd02c1247d6b283793ba1eb5204-1024x576.jpg 1024w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3693dcd02c1247d6b283793ba1eb5204-768x432.jpg 768w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3693dcd02c1247d6b283793ba1eb5204-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >What Is CFP4?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>CFP4 (C Form-factor Pluggable 4)<\/strong> is a 100G optical transceiver standard developed as a smaller and more efficient evolution of earlier CFP modules (CFP\/CFP2). It was designed primarily for telecom and carrier-grade applications, where high-performance optical transmission\u2014especially over longer distances\u2014is required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CFP4 modules typically use a 4\u00d725G lane architecture, meaning they combine four electrical lanes of 25 Gbps to achieve 100G throughput. Compared to earlier CFP generations, CFP4 significantly reduces:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Physical size<\/p><\/li><li><p>Power consumption<\/p><\/li><li><p>Heat output<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However, despite these improvements, CFP4 modules are still larger and more power-hungry than newer alternatives, which limits their use in high-density environments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >What Is QSFP28?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>QSFP28 (Quad Small Form-factor Pluggable 28)<\/strong> is the dominant <a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/488422.htm\">100G transceiver <\/a>form factor in modern networking, especially in data centers and cloud infrastructure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Like CFP4, QSFP28 also uses a 4\u00d725G lane design, but it is built with a much more compact footprint. This allows network devices\u2014such as switches and routers\u2014to support significantly higher port density, which is a critical requirement for scalable architectures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">QSFP28 modules are widely used in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Hyperscale <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/knowledge-center\/what-is-a-data-center\/\">data centers<\/a><\/p><\/li><li><p>Enterprise core networks<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/glossary\/what-is-hpc-high-performance-computing\/\">High-performance computing<\/a> (HPC) environments<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Their advantages include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Smaller size (higher port density)<\/p><\/li><li><p>Lower power consumption<\/p><\/li><li><p>Broad ecosystem compatibility<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" >Why Compare CFP4 vs. QSFP28?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">At a technical level, both CFP4 and QSFP28 deliver the same 100G <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/knowledge-center\/qsfp-data-rate-explained-40g-100g-and-compatibility\/\">data rate<\/a>, and both rely on similar lane structures. So naturally, many engineers ask:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>If performance is similar, what actually differentiates them?<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The answer lies in <strong>efficiency, scalability, and deployment context.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Users compare CFP4 vs. QSFP28 because they need to decide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Whether to continue using existing CFP4 infrastructure<\/p><\/li><li><p>Or migrate to QSFP28 for better density and lower cost per bit<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In other words, this is not just a specification comparison\u2014it\u2019s a strategic decision about network design and future-proofing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the next section, we\u2019ll break down the key differences side by side, so you can quickly identify which form factor aligns best with your specific use case.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x23e9; CFP4 vs. QSFP28: Key Differences at a Glance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When evaluating <strong>CFP4 vs. QSFP28<\/strong>, the most important differences come down to physical design, efficiency, and deployment flexibility. While both support 100G transmission using similar electrical architectures, their real-world performance impact is very different\u2014especially in modern high-density environments.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Below is a side-by-side comparison of the key factors engineers and decision-makers care about most:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/1e2531332cf840bca2e32faa3d6f0338.jpg\" alt=\"CFP4 vs. QSFP28: Key Differences at a Glance\" class=\"wp-image-2506\" srcset=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/1e2531332cf840bca2e32faa3d6f0338.jpg 1200w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/1e2531332cf840bca2e32faa3d6f0338-300x169.jpg 300w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/1e2531332cf840bca2e32faa3d6f0338-1024x576.jpg 1024w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/1e2531332cf840bca2e32faa3d6f0338-768x432.jpg 768w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/1e2531332cf840bca2e32faa3d6f0338-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >CFP4 vs. QSFP28 Comparison Table<\/h3>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 221px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"221\"><p>Feature<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>CFP4<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>QSFP28<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"221\"><p><strong>Form Factor Size<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Larger (telecom-oriented)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Compact (data center optimized)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"221\"><p><strong>Power Consumption<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Higher (typically 6\u201312W)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Lower (typically 2.5\u20134W)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"221\"><p><strong>Port Density<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Limited (fewer ports per switch)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>High (more ports per rack unit)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"221\"><p><strong>Lane Architecture<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>4 \u00d7 25G<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>4 \u00d7 25G<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"221\"><p><strong>Thermal Efficiency<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Moderate<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>High<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"221\"><p><strong>Typical Deployment<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Telecom, long-haul, legacy systems<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Data centers, cloud, enterprise networks<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"221\"><p><strong>Market Adoption<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Declining<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Dominant<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >Size and Port Density<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most noticeable differences in CFP4 vs. QSFP28 is physical size.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/www.cisco.com\/c\/en\/us\/products\/collateral\/interfaces-modules\/transceiver-modules\/data_sheet_c78-633027.html\"><strong>CFP4 modules<\/strong><\/a> are significantly larger, which limits how many ports can fit on a single switch or router.<\/p><\/li><li><p><a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/482496.htm\"><strong>QSFP28 modules<\/strong><\/a>, by contrast, are much smaller\u2014allowing 3\u00d7 to 4\u00d7 higher port density on the same hardware.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This makes QSFP28 the preferred choice for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Hyperscale data centers<\/p><\/li><li><p>Spine-leaf architectures<\/p><\/li><li><p>High-density switching environments<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" >Power Consumption and Efficiency<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Power efficiency is a major factor in modern network design.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>CFP4<\/strong> <strong>modules<\/strong> typically consume more power, leading to higher cooling requirements and operational costs.<\/p><\/li><li><p><strong>QSFP28<\/strong> <strong>modules<\/strong> are designed for low power per bit, making them ideal for large-scale deployments.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Over time, this translates into:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Lower OPEX (operational expenditure)<\/p><\/li><li><p>Reduced thermal management complexity<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" >Lane Architecture (Why Performance Looks Similar)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Interestingly, both CFP4 and QSFP28 use the same fundamental structure:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>4 lanes \u00d7 25 Gbps = 100G total bandwidth<\/strong><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This means that in terms of raw throughput, there is no major difference. However:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>QSFP28 integrates this architecture into a more efficient, compact design<\/p><\/li><li><p>CFP4 retains a bulkier, legacy-oriented implementation<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">So the real difference is not speed\u2014but how efficiently that speed is delivered<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Deployment Environments<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The intended use cases further highlight the difference between CFP4 and QSFP28:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>CFP4<\/strong> is still found in:<\/p><ul><li><p>Telecom infrastructure<\/p><\/li><li><p>Long-haul or metro networks<\/p><\/li><li><p>Legacy systems requiring backward compatibility<\/p><\/li><\/ul><\/li><li><p><strong>QSFP28<\/strong> dominates in:<\/p><ul><li><p>Data centers<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/knowledge-center\/google-cloud-platform-gcp-networking-architecture-guide\/\">Cloud computing<\/a> environments<\/p><\/li><li><p>Enterprise core and aggregation layers<\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Takeaway<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Although both modules deliver 100G performance, the comparison of CFP4 vs. QSFP28 ultimately comes down to this:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>CFP4 is a transitional, telecom-focused form factor, while QSFP28 is the modern standard built for high-density, energy-efficient networking.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x23e9; CFP4 vs. QSFP28 for Data Centers<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In modern data center design, the comparison of CFP4 vs. QSFP28 is heavily influenced by one dominant priority: port density per rack unit. As hyperscale cloud providers and enterprise operators continue to scale 100G networks, the physical efficiency of transceiver form factors has become just as important as bandwidth itself.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/c78844a8d7f04b2f89a7029734bd1077.jpg\" alt=\"CFP4 vs. QSFP28 for Data Centers\" class=\"wp-image-2507\" srcset=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/c78844a8d7f04b2f89a7029734bd1077.jpg 1200w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/c78844a8d7f04b2f89a7029734bd1077-300x169.jpg 300w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/c78844a8d7f04b2f89a7029734bd1077-1024x576.jpg 1024w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/c78844a8d7f04b2f89a7029734bd1077-768x432.jpg 768w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/c78844a8d7f04b2f89a7029734bd1077-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >Why QSFP28 Dominates Data Center Deployments<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In nearly all modern <strong>leaf-spine architectures<\/strong>, <strong>QSFP28 has become the default 100G interface<\/strong>. The reasons are straightforward and strongly tied to operational efficiency:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>High port density:<\/strong> More QSFP28 ports can fit into a single switch chassis, maximizing throughput per rack unit<\/p><\/li><li><p><strong>Lower power per port:<\/strong> Critical for reducing cooling load in dense environments<\/p><\/li><li><p><strong>Flexible deployment:<\/strong> Supports <a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/473115.htm\">SR4<\/a>, <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/488423.htm\">LR4<\/a>, and DAC\/AOC options across short and long reach scenarios<\/p><\/li><li><p><strong>Ecosystem maturity:<\/strong> Broad vendor support across switches, NICs, and optical modules<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In practical terms, QSFP28 enables data centers to scale horizontally without being constrained by physical space or thermal limitations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Why CFP4 Is Rare in Data Centers<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Although CFP4 also supports 100G, it is rarely used in modern data center builds due to several limitations:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Larger physical footprint reduces switch port density<\/p><\/li><li><p>Higher power consumption increases operational cost<\/p><\/li><li><p>Less flexibility in high-density switching platforms<\/p><\/li><li><p>Limited adoption in newer cloud-native infrastructure<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">As a result, CFP4 is typically absent from greenfield data center deployments and is mostly found in older or transitional systems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Rack Efficiency: The Deciding Factor<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When evaluating CFP4 vs. QSFP28, rack efficiency becomes the decisive metric:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>QSFP28 allows more 100G links per rack unit, directly improving:<\/p><ul><li><p>Bandwidth density<\/p><\/li><li><p>Space utilization<\/p><\/li><li><p>Cost per gigabit<\/p><\/li><\/ul><\/li><li><p>CFP4, while capable of the same 100G throughput, reduces:<\/p><ul><li><p>Port scalability<\/p><\/li><li><p>Switching efficiency per chassis<\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is why QSFP28 is strongly preferred in hyperscale environments where every rack unit matters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For modern data centers, the conclusion is clear:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>QSFP28 is the standard choice for 100G deployments due to its superior density, efficiency, and scalability. CFP4 is largely considered legacy in this environment.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x23e9; CFP4 vs. QSFP28 for Telecom and Long-Distance Networks<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While QSFP28 dominates data centers, the comparison changes when we move into <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/knowledge-center\/sfp-in-telecom-meaning-types-applications\/\">telecom<\/a>, metro, and long-haul optical transport networks. In these environments, design priorities shift from density to reach, robustness, and system compatibility.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/619b6c36de2e430ea5d84152bc750d83.jpg\" alt=\"CFP4 vs. QSFP28 for Telecom and Long-Distance Networks\" class=\"wp-image-2508\" srcset=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/619b6c36de2e430ea5d84152bc750d83.jpg 1200w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/619b6c36de2e430ea5d84152bc750d83-300x169.jpg 300w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/619b6c36de2e430ea5d84152bc750d83-1024x576.jpg 1024w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/619b6c36de2e430ea5d84152bc750d83-768x432.jpg 768w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/619b6c36de2e430ea5d84152bc750d83-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >Where CFP4 Still Appears<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CFP4 continues to be used in certain carrier-grade and telecom infrastructures, especially in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Metro aggregation networks<\/p><\/li><li><p>Long-haul transmission systems (DWDM-based architectures)<\/p><\/li><li><p>Legacy 100G transport platforms<\/p><\/li><li><p>High-performance optical transport equipment (<a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/glossary\/what-is-otn-optical-transport-network\/\">OTN<\/a> systems)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In these scenarios, CFP4 is often integrated into systems designed before QSFP28 became dominant.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Why CFP4 Remains Relevant in Telecom<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike data centers, telecom networks prioritize:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Optical reach and signal stability<\/p><\/li><li><p>Integration with existing transport equipment<\/p><\/li><li><p>Carrier-grade reliability over density<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">CFP4 modules are often paired with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Coherent optics platforms<\/p><\/li><li><p>Long-distance <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/glossary\/what-is-dwdm-explaining-dense-wavelength-division-multiplexing\/\">DWDM<\/a> systems<\/p><\/li><li><p>Optical line systems requiring robust power budgets<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In such cases, CFP4\u2019s larger form factor is less of a disadvantage and sometimes even beneficial for thermal and optical performance management.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >When QSFP28 Enters Telecom Environments<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">QSFP28 is increasingly used in telecom networks, but typically in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Edge aggregation layers<\/p><\/li><li><p>Short-reach interconnects between routers<\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/knowledge-center\/data-center-interconnect-definition-benefits-and-role-of-optical-modules\/\">Data center interconnect<\/a> (DCI) scenarios<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However, for true long-haul transmission, CFP4 (or even CFP2-DCO\/CFP8 in newer systems) may still be preferred depending on equipment compatibility.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >What Network Planners Should Evaluate<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When choosing between CFP4 vs. QSFP28 in telecom environments, engineers should assess:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Existing installed base compatibility<\/strong><\/p><\/li><li><p>Optical reach requirements (ZR\/ZR+ or DWDM systems)<\/p><\/li><li><p>Equipment vendor ecosystem support<\/p><\/li><li><p>Upgrade path toward coherent <a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/492340.htm\">QSFP-DD<\/a> or OSFP modules<\/p><\/li><li><p>Total lifecycle cost of migration<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The key decision is not just performance\u2014but <strong>system continuity and upgrade risk<\/strong>.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>In telecom and long-distance optical networks, CFP4 is not obsolete\u2014it is situationally relevant, especially in legacy or transport-heavy infrastructures. QSFP28, however, is increasingly used at the network edge and in hybrid architectures.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x23e9; Power, Density, and Total Cost of Ownership<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When evaluating CFP4 vs. QSFP28, performance alone is not the deciding factor\u2014especially since both deliver the same 100G bandwidth capability. In real-world network planning, the most important considerations are power efficiency, port density, and total cost of ownership (TCO) over the lifecycle of the deployment.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9c7040d966e44451b77ca77e5eda7259.jpg\" alt=\"Power, Density, and Total Cost of Ownership\" class=\"wp-image-2509\" srcset=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9c7040d966e44451b77ca77e5eda7259.jpg 1200w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9c7040d966e44451b77ca77e5eda7259-300x169.jpg 300w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9c7040d966e44451b77ca77e5eda7259-1024x576.jpg 1024w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9c7040d966e44451b77ca77e5eda7259-768x432.jpg 768w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/9c7040d966e44451b77ca77e5eda7259-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >Power Consumption: Efficiency at Scale<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Power usage is one of the most critical differentiators in modern optical networks.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>CFP4 modules<\/strong> typically consume higher power per port, often in the range of ~6\u201312W depending on optics type and reach.<\/p><\/li><li><p><strong>QSFP28 modules<\/strong> are designed for efficiency, generally operating around 2.5\u20134W per port.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">While this difference may seem small at the single-module level, it becomes significant at scale:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>A switch with 128 ports can result in hundreds of watts of additional power draw if CFP4 is used instead of QSFP28.<\/p><\/li><li><p>Higher power directly increases:<\/p><ul><li><p>Cooling requirements<\/p><\/li><li><p>Data center energy consumption<\/p><\/li><li><p>Operational costs (OPEX)<\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key insight:<\/strong> QSFP28 is optimized for \u201cpower-per-bit efficiency,\u201d making it far more suitable for large-scale deployments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Port Density: The Rack Space Multiplier<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In modern network architecture, physical space is money.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>CFP4\u2019s larger form factor<\/strong> limits how many ports can fit into a switch or line card.<\/p><\/li><li><p><strong>QSFP28\u2019s compact design<\/strong> allows significantly higher port density within the same hardware footprint.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This impacts:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Number of 100G links per rack unit<\/p><\/li><li><p>Switching capacity per chassis<\/p><\/li><li><p>Overall infrastructure scalability<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In hyperscale environments, QSFP28 can deliver 2\u00d7 to 4\u00d7 higher port density compared to CFP4-based systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why QSFP28 has become the standard for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Leaf-spine data center networks<\/p><\/li><li><p>Cloud infrastructure<\/p><\/li><li><p>High-density aggregation layers<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" >Total Cost of Ownership (TCO)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When comparing CFP4 vs. QSFP28, TCO is the most important long-term metric\u2014not just initial module price.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TCO includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Hardware cost (<a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/knowledge-center\/what-is-a-network-switch\/\">switches<\/a> + optics)<\/p><\/li><li><p>Power consumption<\/p><\/li><li><p>Cooling infrastructure<\/p><\/li><li><p>Rack space utilization<\/p><\/li><li><p>Maintenance and scalability costs<\/p><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" >CFP4 TCO Profile<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">CFP4 systems tend to have:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Higher power consumption \u2192 higher electricity cost<\/p><\/li><li><p>Lower port density \u2192 more hardware required for same capacity<\/p><\/li><li><p>Increased cooling demands<\/p><\/li><li><p>Potentially higher per-bit infrastructure cost<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">CFP4 may still be cost-effective in stable, legacy telecom environments, but scales poorly in modern dense deployments.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" >QSFP28 TCO Profile<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">QSFP28 provides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Lower power per port \u2192 reduced OPEX<\/p><\/li><li><p>Higher density \u2192 fewer switches needed<\/p><\/li><li><p>Better scalability \u2192 delayed infrastructure expansion<\/p><\/li><li><p>Strong vendor ecosystem \u2192 competitive pricing<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This leads to a lower cost per 100G link over time, especially in cloud-scale environments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Real-World Impact: Why Operators Choose QSFP28<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In practical deployments, operators often find that:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Even if CFP4 modules are functionally sufficient,<\/p><\/li><li><p>The infrastructure overhead outweighs the benefits<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">QSFP28 reduces:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Rack space consumption<\/p><\/li><li><p>Energy usage<\/p><\/li><li><p>Cooling system load<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">And increases:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Bandwidth per rack<\/p><\/li><li><p>Deployment flexibility<\/p><\/li><li><p>Long-term ROI<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>While CFP4 and QSFP28 offer identical 100G throughput, QSFP28 delivers a significantly lower total cost of ownership due to superior power efficiency and higher port density.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">This makes QSFP28 the preferred choice for most modern networks, while CFP4 remains relevant only in specialized or legacy environments where migration is not yet feasible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x23e9; Should You Replace CFP4 with QSFP28?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most common high-intent questions behind CFP4 vs. QSFP28 is not theoretical\u2014it is operational:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u201cShould I replace my existing CFP4 infrastructure with QSFP28?\u201d<\/strong><\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The answer is not universal. It depends on your current network architecture, scalability requirements, and upgrade lifecycle timing. In practice, this is a migration decision framework, not a simple product comparison.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/924a95ce983849bdae5714d6ec38f7bf.jpg\" alt=\"Should You Replace CFP4 with QSFP28?\" class=\"wp-image-2510\" srcset=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/924a95ce983849bdae5714d6ec38f7bf.jpg 1200w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/924a95ce983849bdae5714d6ec38f7bf-300x169.jpg 300w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/924a95ce983849bdae5714d6ec38f7bf-1024x576.jpg 1024w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/924a95ce983849bdae5714d6ec38f7bf-768x432.jpg 768w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/924a95ce983849bdae5714d6ec38f7bf-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >Step 1: Evaluate Your Existing Infrastructure<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The first and most important factor is what you already have deployed.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" >You should consider <em>keeping CFP4<\/em> if:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Your network is based on legacy 100G telecom or transport platforms<\/p><\/li><li><p>CFP4 modules are deeply integrated into line cards or optical transport systems<\/p><\/li><li><p>The infrastructure is stable and not approaching capacity limits<\/p><\/li><li><p>Vendor support for CFP4 is still active in your ecosystem<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In these cases, replacing CFP4 may introduce unnecessary cost and operational risk.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" >You should consider <em>migrating to QSFP28<\/em> if:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>You are operating a data center or cloud-oriented architecture<\/p><\/li><li><p>You are experiencing port exhaustion or density limitations<\/p><\/li><li><p>Your switches support QSFP28 natively<\/p><\/li><li><p>You are planning a refresh cycle or hardware upgrad<strong>e<\/strong><\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In modern Ethernet-based networks, QSFP28 is typically the default path forward.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Step 2: Assess Scalability Requirements<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Scalability is the key driver behind most migration decisions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ask yourself:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Will traffic double or triple in the next 2\u20133 years?<\/p><\/li><li><p>Do I need more 100G ports per rack unit?<\/p><\/li><li><p>Am I constrained by physical space or switch density?<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>CFP4 limitations in scaling:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Larger form factor limits port expansion<\/p><\/li><li><p>Higher power per port increases thermal bottlenecks<\/p><\/li><li><p>Slower path toward higher-density architectures<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>QSFP28 advantages in scaling:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Enables high-density leaf-spine designs<\/p><\/li><li><p>Supports modular, incremental expansion<\/p><\/li><li><p>Reduces cost per additional 100G link<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If your network is growth-oriented, QSFP28 is almost always the more future-proof choice.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Step 3: Consider Upgrade Timing (Lifecycle Strategy)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Migration is not only technical\u2014it is also timing-sensitive.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ideal time to replace CFP4:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>During scheduled hardware refresh cycles<\/p><\/li><li><p>When migrating to new switch generations<\/p><\/li><li><p>When expanding data center capacity<\/p><\/li><li><p>When transitioning to cloud-native or <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/ru\/knowledge-center\/software-defined-networking-centralized-flexible-network-management\/\">SDN<\/a> architectures<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Avoid replacing CFP4 when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Equipment is still under depreciation lifecycle<\/p><\/li><li><p>Migration requires full system replacement (high disruption)<\/p><\/li><li><p>There is no immediate performance or capacity bottleneck<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A poorly timed migration can significantly increase both CAPEX and operational downtime.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Step 4: Evaluate Hybrid Transition Strategies<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In many real-world deployments, the best answer is not \u201creplace immediately,\u201d but transition gradually.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common hybrid approach:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Keep CFP4 in core or long-haul transport layers<\/p><\/li><li><p>Introduce QSFP28 in edge, aggregation, and data center layers<\/p><\/li><li><p>Plan gradual migration toward QSFP28-based infrastructure<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This reduces risk while still improving density and efficiency.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Is CFP4 Obsolete in 2026?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CFP4 is not completely obsolete in 2026, but it is clearly in a declining lifecycle phase within modern networking.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" >Where CFP4 is becoming less relevant:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>New data center builds (almost fully QSFP28\/QSFP-DD driven)<\/p><\/li><li><p>High-density Ethernet switching environments<\/p><\/li><li><p>Cloud-native and hyperscale architectures<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In these scenarios, CFP4 is increasingly avoided due to its:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Larger size<\/p><\/li><li><p>Higher power consumption<\/p><\/li><li><p>Lower port density<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is why QSFP28 has effectively become the default 100G standard in Ethernet-based systems.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" >Where CFP4 is still relevant:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">CFP4 continues to exist in specific telecom and transport environments, especially where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Existing CFP4-based systems are still in service<\/p><\/li><li><p>Long-haul or metro optical transport platforms are deployed<\/p><\/li><li><p>Upgrading hardware is costly or operationally disruptive<\/p><\/li><li><p>Vendor ecosystems still support CFP4 optics<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In these cases, CFP4 remains a maintenance-oriented technology, not a growth technology.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" >Market Reality<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The industry trend can be summarized as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>QSFP28 = mainstream 100G Ethernet standard<\/p><\/li><li><p>CFP4 = legacy + niche telecom continuity form factor<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Most operators are no longer choosing CFP4 for new designs\u2014they are only <strong>maintaining or gradually replacing it<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Takeaway<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>CFP4 is not fully obsolete in 2026, but it is no longer a forward-looking choice for new deployments. QSFP28 has become the dominant standard for scalable, cost-efficient 100G Ethernet networks.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x23e9; FAQ About CFP4 vs. QSFP28<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/b26bf75f6bb24537bd8bd0d83155d666.jpg\" alt=\"FAQ About CFP4 vs. QSFP28\" class=\"wp-image-2511\" srcset=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/b26bf75f6bb24537bd8bd0d83155d666.jpg 1200w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/b26bf75f6bb24537bd8bd0d83155d666-300x169.jpg 300w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/b26bf75f6bb24537bd8bd0d83155d666-1024x576.jpg 1024w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/b26bf75f6bb24537bd8bd0d83155d666-768x432.jpg 768w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/b26bf75f6bb24537bd8bd0d83155d666-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >1. What is the main difference between CFP4 and QSFP28?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CFP4 and QSFP28 both support 100G Ethernet, but differ in design efficiency. CFP4 is larger and more telecom-oriented, while QSFP28 is smaller, more power-efficient, and optimized for high-density data center deployments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >2. Which is more widely used in modern networks, CFP4 or QSFP28?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">QSFP28 is significantly more widely used today because it has become the standard 100G form factor in data centers and enterprise networks, while CFP4 is mostly limited to legacy or specialized telecom systems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >3. Do CFP4 and QSFP28 support the same transmission speed?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Both CFP4 and QSFP28 commonly support 100G transmission using 4\u00d725G lanes, meaning their raw data rate capability is essentially equivalent.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >4. Why is QSFP28 preferred for high-density switching?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">QSFP28 is preferred because its smaller form factor allows more ports per switch, improving rack utilization and enabling scalable leaf-spine architectures with higher bandwidth per unit space.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >5. Can CFP4 and QSFP28 be used in the same network?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, they can coexist in the same network, but typically in different layers. CFP4 is often used in <strong>transport or legacy core systems, while QSFP28 is used in aggregation and data center layers<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >6. Which module has better power efficiency: CFP4 or QSFP28?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">QSFP28 has better power efficiency. It consumes less energy per port, which reduces cooling requirements and lowers overall operational costs in large-scale deployments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >7. Is there a performance difference between CFP4 and QSFP28?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In terms of raw throughput, there is no major performance difference, as both support 100G. The key differences lie in efficiency, scalability, and physical design, not speed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >8. What factors should influence the choice between CFP4 and QSFP28?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The decision should be based on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Network architecture type (data center vs. telecom)<\/p><\/li><li><p>Required port density<\/p><\/li><li><p>Power and cooling constraints<\/p><\/li><li><p>Upgrade and scalability plans<\/p><\/li><li><p>Existing hardware compatibility<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >&#x23e9; Conclusion: Which One Should You Choose?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When comparing CFP4 vs. QSFP28, the key takeaway is that both technologies deliver the same 100G Ethernet capability, but they serve very different network design philosophies.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>CFP4<\/strong> is best understood as a legacy-friendly, telecom-oriented form factor, still relevant in specific long-haul or existing transport infrastructures where stability and compatibility matter more than density.<\/p><\/li><li><p><strong>QSFP28<\/strong>, on the other hand, is the modern standard for 100G Ethernet, widely adopted in data centers, cloud platforms, and enterprise networks due to its superior port density, power efficiency, and scalability.<\/p><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3db779fd851543ba9878c7c7dd14f4ad.jpg\" alt=\"CFP4 vs. QSFP28: Which One Should You Choose?\" class=\"wp-image-2512\" srcset=\"https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3db779fd851543ba9878c7c7dd14f4ad.jpg 1200w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3db779fd851543ba9878c7c7dd14f4ad-300x169.jpg 300w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3db779fd851543ba9878c7c7dd14f4ad-1024x576.jpg 1024w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3db779fd851543ba9878c7c7dd14f4ad-768x432.jpg 768w, https:\/\/resources.l-p.com\/wp-content\/uploads\/2026\/05\/3db779fd851543ba9878c7c7dd14f4ad-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" >Final Recommendation<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>If you are building a new network or planning a scalable upgrade, QSFP28 is the clear and future-proof choice.<br\/>If you are maintaining a legacy telecom or transport system, CFP4 may still be appropriate, but should be considered a transitional technology rather than a growth path.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">In most modern deployments, the industry trend is decisive: networks are steadily standardizing around QSFP28 and higher-density form factors.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >&#x1f517; Need Reliable 100G Optical Solutions?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For high-quality, compatible optical modules and connectivity solutions for modern network infrastructure, you can explore the <a target=\"_self\" href=\"https:\/\/www.l-p.com\/\"><strong>LINK-PP Official Store<\/strong><\/a>, where a wide range of QSFP28 and related optical products are available to support data center and telecom deployments.<\/p>","protected":false},"excerpt":{"rendered":"<p>Compare CFP4 vs. QSFP28 by size, power, density, and deployment fit. Learn which 100G module is better for data centers, telecom, and upgrades.<\/p>","protected":false},"author":1,"featured_media":2513,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[28],"tags":[13],"class_list":["post-2514","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-products","tag-100g-modules"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/posts\/2514","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/comments?post=2514"}],"version-history":[{"count":4,"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/posts\/2514\/revisions"}],"predecessor-version":[{"id":10704,"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/posts\/2514\/revisions\/10704"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/media\/2513"}],"wp:attachment":[{"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/media?parent=2514"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/categories?post=2514"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resources.l-p.com\/ru\/wp-json\/wp\/v2\/tags?post=2514"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}