{"id":5669,"date":"2023-09-06T07:32:33","date_gmt":"2023-09-06T07:32:33","guid":{"rendered":"https:\/\/www.fibermall.com\/blog\/?p=5669"},"modified":"2023-09-28T10:09:38","modified_gmt":"2023-09-28T10:09:38","slug":"what-do-the-suffixes-sr8-sr8-c-srbd-sr4-dr4-xdr4-plr4-fr4-lr4-and-2fr4-stand-for","status":"publish","type":"post","link":"https:\/\/www.fibermall.com\/questions\/what-do-the-suffixes-sr8-sr4-stand.htm","title":{"rendered":"What do the Suffixes \u201cSR8, SR8-C, SRBD, SR4, DR4\/XDR4\/PLR4, FR4\/LR4 and 2FR4\u201d\u00a0Stand for?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"5669\" class=\"elementor elementor-5669\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-68be862 e-flex e-con-boxed e-con e-parent\" data-id=\"68be862\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7adb7ee2 elementor-align-center elementor-widget elementor-widget-post-info\" data-id=\"7adb7ee2\" data-element_type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-e5033fd elementor-inline-item\" itemprop=\"author\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-user-circle\" viewBox=\"0 0 496 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M248 104c-53 0-96 43-96 96s43 96 96 96 96-43 96-96-43-96-96-96zm0 144c-26.5 0-48-21.5-48-48s21.5-48 48-48 48 21.5 48 48-21.5 48-48 48zm0-240C111 8 0 119 0 256s111 248 248 248 248-111 248-248S385 8 248 8zm0 448c-49.7 0-95.1-18.3-130.1-48.4 14.9-23 40.4-38.6 69.6-39.5 20.8 6.4 40.6 9.6 60.5 9.6s39.7-3.1 60.5-9.6c29.2 1 54.7 16.5 69.6 39.5-35 30.1-80.4 48.4-130.1 48.4zm162.7-84.1c-24.4-31.4-62.1-51.9-105.1-51.9-10.2 0-26 9.6-57.6 9.6-31.5 0-47.4-9.6-57.6-9.6-42.9 0-80.6 20.5-105.1 51.9C61.9 339.2 48 299.2 48 256c0-110.3 89.7-200 200-200s200 89.7 200 200c0 43.2-13.9 83.2-37.3 115.9z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-author\">\n\t\t\t\t\t\t\t\t\t\tBrian\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-b0a8dd8 elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-calendar\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M12 192h424c6.6 0 12 5.4 12 12v260c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V204c0-6.6 5.4-12 12-12zm436-44v-36c0-26.5-21.5-48-48-48h-48V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H160V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H48C21.5 64 0 85.5 0 112v36c0 6.6 5.4 12 12 12h424c6.6 0 12-5.4 12-12z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-date\">\n\t\t\t\t\t\t\t\t\t\t<time>September 6, 2023<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-42774c2 elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-clock\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm0 448c-110.5 0-200-89.5-200-200S145.5 56 256 56s200 89.5 200 200-89.5 200-200 200zm61.8-104.4l-84.9-61.7c-3.1-2.3-4.9-5.9-4.9-9.7V116c0-6.6 5.4-12 12-12h32c6.6 0 12 5.4 12 12v141.7l66.8 48.6c5.4 3.9 6.5 11.4 2.6 16.8L334.6 349c-3.9 5.3-11.4 6.5-16.8 2.6z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-time\">\n\t\t\t\t\t\t\t\t\t\t<time>7:32 am<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5024219d e-flex e-con-boxed e-con e-parent\" data-id=\"5024219d\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-34cd2b98 e-flex e-con-boxed e-con e-parent\" data-id=\"34cd2b98\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-57bdf7b0 elementor-widget elementor-widget-author-box\" data-id=\"57bdf7b0\" data-element_type=\"widget\" data-widget_type=\"author-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-author-box\">\n\t\t\t\t\t\t\t<div  class=\"elementor-author-box__avatar\">\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/08\/mccurry-300x300.jpg\" alt=\"Picture of John Doe\" loading=\"lazy\">\n\t\t\t\t<\/div>\n\t\t\t\n\t\t\t<div class=\"elementor-author-box__text\">\n\t\t\t\t\t\t\t\t\t<div >\n\t\t\t\t\t\t<h4 class=\"elementor-author-box__name\">\n\t\t\t\t\t\t\tJohn Doe\t\t\t\t\t\t<\/h4>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-author-box__bio\">\n\t\t\t\t\t\t<p>Answered on 7:32 am<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1db26611 elementor-widget elementor-widget-text-editor\" data-id=\"1db26611\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-size: 14pt;\">In general, the letters refer to reach or optics technology, and the number refers to the number of optical channels:<\/span><\/p><p><span style=\"font-size: 14pt;\">SR8: Short Range 8. This transceiver supports 400G transmission over multimode fiber (MMF) with a maximum reach of 100 meters. It uses a MPO-16 connector and PAM4 modulation.<\/span><\/p><p><span style=\"font-size: 14pt;\">SR8-C: Short Range 8 Copper. This transceiver supports 400G transmission over copper cable with a maximum reach of 3 meters. It uses a QSFP-DD connector and PAM4 modulation.<\/span><\/p><p><span style=\"font-size: 14pt;\">SRBD: Short Range Bidirectional. This transceiver supports 400G transmission over MMF with a maximum reach of 70 meters. It uses a <a class=\"wpil_keyword_link\" href=\"https:\/\/www.fibermall.com\/blog\/duplex-lc-connector.htm\"   title=\"duplex LC connector\" data-wpil-keyword-link=\"linked\" target=\"_blank\">duplex LC connector<\/a> and PAM4 modulation.<\/span><\/p><p><span style=\"font-size: 14pt;\">SR4: Short Range 4. This transceiver supports 400G transmission over MMF with a maximum reach of 100 meters. It uses a MPO-12 connector and PAM4 modulation.<\/span><\/p><p><span style=\"font-size: 14pt;\">DR4 \/ XDR4 \/ PLR4: Data Center Reach 4 \/ eXtended Data Center Reach 4 \/ Parallel Long Reach 4. These transceivers support 400G transmission over single-mode fiber (SMF) with a maximum reach of 500 meters \/ 2 kilometers \/ 10 kilometers respectively. They use a MPO-12 connector and PAM4 modulation.<\/span><\/p><p><span style=\"font-size: 14pt;\">FR4 \/ LR4: Fiber Reach 4 \/ Long Reach 4. These transceivers support 400G transmission over SMF with a maximum reach of 2 kilometers \/ 10 kilometers respectively. They use a duplex LC connector and PAM4 modulation.<\/span><\/p><p><span style=\"font-size: 14pt;\">2FR4: Two Fiber Reach 4. This transceiver supports 400G transmission over SMF with a maximum reach of 2 kilometers. It uses two duplex LC connectors and coherent modulation.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-51eeb60d e-flex e-con-boxed e-con e-parent\" data-id=\"51eeb60d\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-133d832f elementor-widget elementor-widget-heading\" data-id=\"133d832f\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">People Also Ask<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-41e8357f elementor-posts--thumbnail-none elementor-grid-3 elementor-grid-tablet-2 elementor-grid-mobile-1 elementor-card-shadow-yes elementor-posts__hover-gradient elementor-widget elementor-widget-posts\" data-id=\"41e8357f\" data-element_type=\"widget\" data-settings=\"{&quot;cards_columns&quot;:&quot;3&quot;,&quot;cards_columns_tablet&quot;:&quot;2&quot;,&quot;cards_columns_mobile&quot;:&quot;1&quot;,&quot;cards_row_gap&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:35,&quot;sizes&quot;:[]},&quot;cards_row_gap_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;cards_row_gap_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"posts.cards\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-posts-container elementor-posts elementor-posts--skin-cards elementor-grid\" role=\"list\">\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20507 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-wdm-plc-splitter\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/dwdm-complete-guide.htm\"  target=\"_blank\">\n\t\t\t\tDWDM Complete Guide: Dense Wavelength Division Multiplexing\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>A metro fiber route between two data centers can reach its capacity limit faster than expected. When it does, the immediate response may be to deploy additional fiber. However, installing new fiber infrastructure can take months or even years and may cost more than the networking equipment at both ends.<\/p>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-author\">\n\t\t\tFelisac\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 16, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20489 post type-post status-publish format-standard has-post-thumbnail hentry category-blog\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/qsfp112-troubleshooting.htm\"  target=\"_blank\">\n\t\t\t\tQSFP112 Troubleshooting Guide: Fix Link Down, Flaps and FEC Errors\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Imagine an engineer named Priya troubleshooting a 400G QSFP112 port that suddenly went down at 2:10 a.m. The module appeared in the switch inventory, but the link indicator remained dark. After cleaning the MPO connector twice and replacing the patch cord, the link still would not come up. Further investigation<\/p>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-author\">\n\t\t\tCatherine\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 14, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20484 post type-post status-publish format-standard has-post-thumbnail hentry category-industry-news category-news\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/news\/usfp-optical-module-nvidia-cisco-400g.htm\"  target=\"_blank\">\n\t\t\t\tNVIDIA and Cisco Unveil USFP Optics \u2014 400G per Lane and 12.8Tb\/s for AI Factories\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>October 14, 2026&nbsp;\u2014 NVIDIA and Cisco have announced&nbsp;Ultra-Dense Small Form Factor Pluggable (USFP), a new optical transceiver form factor designed as the first pluggable module to carry 400Gb\/s-per-lane electrical signals. Compared with today&#8217;s 200Gb\/s-per-lane pluggables, USFP delivers&nbsp;4x the bandwidth and front-panel bandwidth density&nbsp;at roughly&nbsp;1.3x the power efficiency, letting AI factory<\/p>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-author\">\n\t\t\tCatherine\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 14, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20474 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-fiber-optic-transceivers\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/qsfp112-backward-compatible.htm\"  target=\"_blank\">\n\t\t\t\tIs QSFP112 Backward Compatible with QSFP28 and QSFP56?\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>The short version up front, in case you&#8217;re mid-decision: QSFP112 backward compatibility works in the direction of the newer port, not the newer module. &nbsp;Can a QSFP112 transceiver work in an older QSFP28 switch? Can existing 100G QSFP28 or 200G QSFP56 modules be reused in newer QSFP112 ports? These questions<\/p>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-author\">\n\t\t\tMia\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 13, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20455 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-fiber-optic-cables\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/400g-to-4x100g-breakout.htm\"  target=\"_blank\">\n\t\t\t\t400G to 4\u00d7100G Breakout: Why Sub-Ports Stay Down \u2014 and How to Fix Them\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>You connect a 400G-to-4\u00d7100G breakout cable&nbsp;to a high-density Ethernet switch, configure the interfaces, and check the transceiver diagnostics. The optical power readings appear normal, yet only some of the four 100G sub-ports establish a link. Others remain down, while active links may report CRC errors or FEC-related faults. Although cable<\/p>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-author\">\n\t\t\tBrian\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 12, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20464 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-networking\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/400g-infiniband-ndr-vs-ethernet.htm\" >\n\t\t\t\t400G Ethernet vs InfiniBand NDR: Which Fabric for AI?\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Both 400G Ethernet and InfiniBand NDR deliver a nominal bandwidth of 400 Gb\/s per port. However, identical port speeds do not guarantee identical performance in AI training clusters. The differences extend beyond raw bandwidth. InfiniBand uses native RDMA transport and credit-based link-level flow control, while 400G Ethernet typically relies on<\/p>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-author\">\n\t\t\tCatherine\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 12, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-140e18b3 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"140e18b3\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"\/questions.htm\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Read More Questions<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a16ce7f e-flex e-con-boxed e-con e-parent\" data-id=\"a16ce7f\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-56fb5f2c elementor-widget elementor-widget-heading\" data-id=\"56fb5f2c\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Related Articles<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6607691b elementor-grid-3 elementor-grid-tablet-2 elementor-grid-mobile-1 elementor-posts--thumbnail-top elementor-card-shadow-yes elementor-posts__hover-gradient elementor-widget elementor-widget-posts\" data-id=\"6607691b\" data-element_type=\"widget\" data-settings=\"{&quot;cards_columns&quot;:&quot;3&quot;,&quot;cards_columns_tablet&quot;:&quot;2&quot;,&quot;cards_columns_mobile&quot;:&quot;1&quot;,&quot;cards_row_gap&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:35,&quot;sizes&quot;:[]},&quot;cards_row_gap_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;cards_row_gap_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"posts.cards\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-posts-container elementor-posts elementor-posts--skin-cards elementor-grid\" role=\"list\">\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-6073 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-fiber-optic-transceivers\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fibermall.com\/blog\/800g-sr8-400g-sr4-test-report.htm\" tabindex=\"-1\"  target=\"_blank\"><div class=\"elementor-post__thumbnail\"><img fetchpriority=\"high\" decoding=\"async\" width=\"300\" height=\"183\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/10\/800g-sr8-300x183.png\" class=\"attachment-medium size-medium wp-image-6080\" alt=\"800g sr8 and 400g sr4\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/10\/800g-sr8-300x183.png 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/10\/800g-sr8.png 643w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/800g-sr8-400g-sr4-test-report.htm\"  target=\"_blank\">\n\t\t\t\t800G\u00a0SR8 and 400G SR4\u00a0Optical Transceiver Modules Compatibility and Interconnection Test Report\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Version Change Log Writer V0 Sample Test Cassie Test Purpose Test Objects\uff1a800G OSFP SR8\/400G OSFP SR4\/400G Q112 SR4. By conducting corresponding tests, the test parameters meet the relevant industry standards, and the test modules can be normally used for Nvidia&nbsp;(Mellanox)&nbsp;MQM9790 switch, Nvidia&nbsp;(Mellanox)&nbsp;ConnectX-7 network card and Nvidia&nbsp;(Mellanox)&nbsp;BlueField-3, laying a foundation for<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fibermall.com\/blog\/800g-sr8-400g-sr4-test-report.htm\" aria-label=\"Read more about 800G\u00a0SR8 and 400G SR4\u00a0Optical Transceiver Modules Compatibility and Interconnection Test Report\" tabindex=\"-1\"  target=\"_blank\">\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 18, 2023\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20507 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-wdm-plc-splitter\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-complete-guide.htm\" tabindex=\"-1\"  target=\"_blank\"><div class=\"elementor-post__thumbnail\"><img decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/dwdm-300x200.jpg\" class=\"attachment-medium size-medium wp-image-20514\" alt=\"dwdm\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/dwdm-300x200.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/dwdm-768x512.jpg 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/dwdm.jpg 900w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/dwdm-complete-guide.htm\"  target=\"_blank\">\n\t\t\t\tDWDM Complete Guide: Dense Wavelength Division Multiplexing\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>A metro fiber route between two data centers can reach its capacity limit faster than expected. When it does, the immediate response may be to deploy additional fiber. However, installing new fiber infrastructure can take months or even years and may cost more than the networking equipment at both ends.<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-complete-guide.htm\" aria-label=\"Read more about DWDM Complete Guide: Dense Wavelength Division Multiplexing\" tabindex=\"-1\"  target=\"_blank\">\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 16, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20489 post type-post status-publish format-standard has-post-thumbnail hentry category-blog\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp112-troubleshooting.htm\" tabindex=\"-1\"  target=\"_blank\"><div class=\"elementor-post__thumbnail\"><img decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/611C5B49A96B1F6E4DA074DF631ADD35-300x200.jpg\" class=\"attachment-medium size-medium wp-image-20497\" alt=\"qsfp112 troubleshooting\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/611C5B49A96B1F6E4DA074DF631ADD35-300x200.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/611C5B49A96B1F6E4DA074DF631ADD35-768x512.jpg 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/611C5B49A96B1F6E4DA074DF631ADD35.jpg 900w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/qsfp112-troubleshooting.htm\"  target=\"_blank\">\n\t\t\t\tQSFP112 Troubleshooting Guide: Fix Link Down, Flaps and FEC Errors\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Imagine an engineer named Priya troubleshooting a 400G QSFP112 port that suddenly went down at 2:10 a.m. The module appeared in the switch inventory, but the link indicator remained dark. After cleaning the MPO connector twice and replacing the patch cord, the link still would not come up. Further investigation<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp112-troubleshooting.htm\" aria-label=\"Read more about QSFP112 Troubleshooting Guide: Fix Link Down, Flaps and FEC Errors\" tabindex=\"-1\"  target=\"_blank\">\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 14, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20484 post type-post status-publish format-standard has-post-thumbnail hentry category-industry-news category-news\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fibermall.com\/news\/usfp-optical-module-nvidia-cisco-400g.htm\" tabindex=\"-1\"  target=\"_blank\"><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/ultra-dense-small-form-factor-pluggable-1-300x200.jpg\" class=\"attachment-medium size-medium wp-image-20488\" alt=\"ultra-dense-small-form-factor-pluggable\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/ultra-dense-small-form-factor-pluggable-1-300x200.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/ultra-dense-small-form-factor-pluggable-1-768x512.jpg 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/ultra-dense-small-form-factor-pluggable-1.jpg 900w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/news\/usfp-optical-module-nvidia-cisco-400g.htm\"  target=\"_blank\">\n\t\t\t\tNVIDIA and Cisco Unveil USFP Optics \u2014 400G per Lane and 12.8Tb\/s for AI Factories\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>October 14, 2026&nbsp;\u2014 NVIDIA and Cisco have announced&nbsp;Ultra-Dense Small Form Factor Pluggable (USFP), a new optical transceiver form factor designed as the first pluggable module to carry 400Gb\/s-per-lane electrical signals. Compared with today&#8217;s 200Gb\/s-per-lane pluggables, USFP delivers&nbsp;4x the bandwidth and front-panel bandwidth density&nbsp;at roughly&nbsp;1.3x the power efficiency, letting AI factory<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fibermall.com\/news\/usfp-optical-module-nvidia-cisco-400g.htm\" aria-label=\"Read more about NVIDIA and Cisco Unveil USFP Optics \u2014 400G per Lane and 12.8Tb\/s for AI Factories\" tabindex=\"-1\"  target=\"_blank\">\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 14, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20474 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-fiber-optic-transceivers\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp112-backward-compatible.htm\" tabindex=\"-1\"  target=\"_blank\"><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/qsfp112-backward-compatible-300x200.jpg\" class=\"attachment-medium size-medium wp-image-20479\" alt=\"qsfp112 backward compatible\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/qsfp112-backward-compatible-300x200.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/qsfp112-backward-compatible-768x512.jpg 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/qsfp112-backward-compatible.jpg 900w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/qsfp112-backward-compatible.htm\"  target=\"_blank\">\n\t\t\t\tIs QSFP112 Backward Compatible with QSFP28 and QSFP56?\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>The short version up front, in case you&#8217;re mid-decision: QSFP112 backward compatibility works in the direction of the newer port, not the newer module. &nbsp;Can a QSFP112 transceiver work in an older QSFP28 switch? Can existing 100G QSFP28 or 200G QSFP56 modules be reused in newer QSFP112 ports? These questions<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp112-backward-compatible.htm\" aria-label=\"Read more about Is QSFP112 Backward Compatible with QSFP28 and QSFP56?\" tabindex=\"-1\"  target=\"_blank\">\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 13, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20455 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-fiber-optic-cables\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fibermall.com\/blog\/400g-to-4x100g-breakout.htm\" tabindex=\"-1\"  target=\"_blank\"><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/400g-breakout-300x200.jpg\" class=\"attachment-medium size-medium wp-image-20440\" alt=\"400g breakout\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/400g-breakout-300x200.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/400g-breakout-768x512.jpg 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/400g-breakout.jpg 900w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/400g-to-4x100g-breakout.htm\"  target=\"_blank\">\n\t\t\t\t400G to 4\u00d7100G Breakout: Why Sub-Ports Stay Down \u2014 and How to Fix Them\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>You connect a 400G-to-4\u00d7100G breakout cable&nbsp;to a high-density Ethernet switch, configure the interfaces, and check the transceiver diagnostics. The optical power readings appear normal, yet only some of the four 100G sub-ports establish a link. Others remain down, while active links may report CRC errors or FEC-related faults. Although cable<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fibermall.com\/blog\/400g-to-4x100g-breakout.htm\" aria-label=\"Read more about 400G to 4\u00d7100G Breakout: Why Sub-Ports Stay Down \u2014 and How to Fix Them\" tabindex=\"-1\"  target=\"_blank\">\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 12, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-20464 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-networking\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fibermall.com\/blog\/400g-infiniband-ndr-vs-ethernet.htm\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/400g-ethernet-vs-infiniband-300x200.jpg\" class=\"attachment-medium size-medium wp-image-20467\" alt=\"400g ethernet vs infiniband\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/400g-ethernet-vs-infiniband-300x200.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/400g-ethernet-vs-infiniband-768x512.jpg 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2026\/10\/400g-ethernet-vs-infiniband.jpg 900w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fibermall.com\/blog\/400g-infiniband-ndr-vs-ethernet.htm\" >\n\t\t\t\t400G Ethernet vs InfiniBand NDR: Which Fabric for AI?\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Both 400G Ethernet and InfiniBand NDR deliver a nominal bandwidth of 400 Gb\/s per port. However, identical port speeds do not guarantee identical performance in AI training clusters. The differences extend beyond raw bandwidth. InfiniBand uses native RDMA transport and credit-based link-level flow control, while 400G Ethernet typically relies on<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fibermall.com\/blog\/400g-infiniband-ndr-vs-ethernet.htm\" aria-label=\"Read more about 400G Ethernet vs InfiniBand NDR: Which Fabric for AI?\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tOctober 12, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<style>\r\n\r\n        .lwrp.link-whisper-related-posts{\r\n            \r\n            margin-top: 40px;\nmargin-bottom: 30px;\r\n        }\r\n        .lwrp .lwrp-title{\r\n            \r\n            \r\n        }\r\n        .lwrp .lwrp-description{\r\n            \r\n            \r\n\r\n        }\r\n        .lwrp .lwrp-list-container{\r\n        }\r\n        .lwrp .lwrp-list-multi-container{\r\n            display: flex;\r\n        }\r\n        .lwrp .lwrp-list-double{\r\n            width: 48%;\r\n        }\r\n        .lwrp .lwrp-list-triple{\r\n            width: 32%;\r\n        }\r\n        .lwrp .lwrp-list-row-container{\r\n            display: flex;\r\n            justify-content: space-between;\r\n        }\r\n        .lwrp .lwrp-list-row-container .lwrp-list-item{\r\n            width: calc(100% - 20px);\r\n        }\r\n        .lwrp .lwrp-list-item:not(.lwrp-no-posts-message-item){\r\n            \r\n            list-style: decimal;\r\n        }\r\n        .lwrp .lwrp-list-item img{\r\n            max-width: 100%;\r\n            height: auto;\r\n        }\r\n        .lwrp .lwrp-list-item.lwrp-empty-list-item{\r\n            background: initial !important;\r\n        }\r\n        .lwrp .lwrp-list-item .lwrp-list-link .lwrp-list-link-title-text,\r\n        .lwrp .lwrp-list-item .lwrp-list-no-posts-message{\r\n            \r\n                \r\n        }\r\n        @media screen and (max-width: 480px) {\r\n            .lwrp.link-whisper-related-posts{\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-title{\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-description{\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-list-multi-container{\r\n                flex-direction: column;\r\n            }\r\n            .lwrp .lwrp-list-multi-container ul.lwrp-list{\r\n                margin-top: 0px;\r\n                margin-bottom: 0px;\r\n                padding-top: 0px;\r\n                padding-bottom: 0px;\r\n            }\r\n            .lwrp .lwrp-list-double,\r\n            .lwrp .lwrp-list-triple{\r\n                width: 100%;\r\n            }\r\n            .lwrp .lwrp-list-row-container{\r\n                justify-content: initial;\r\n                flex-direction: column;\r\n            }\r\n            .lwrp .lwrp-list-row-container .lwrp-list-item{\r\n                width: 100%;\r\n            }\r\n            .lwrp .lwrp-list-item:not(.lwrp-no-posts-message-item){\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-list-item .lwrp-list-link .lwrp-list-link-title-text,\r\n            .lwrp .lwrp-list-item .lwrp-list-no-posts-message{\r\n                \r\n                    \r\n            }\r\n        }<\/style>\r\n<div id=\"link-whisper-related-posts-widget\" class=\"link-whisper-related-posts lwrp\">\r\n            <h3 class=\"lwrp-title\">Related Posts<\/h3>    \r\n        <div class=\"lwrp-list-container\">\r\n                                            <ul class=\"lwrp-list lwrp-list-single\">\r\n                    <li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/poe-ethernet-switch.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">The Ultimate Guide to Power Over Ethernet Switches: Everything You Need to Know<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/800g-ethernet.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">800G Ethernet: A New Standard in Networking<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/dark-fiber-cable.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Exploring the World of Dark Fiber: Unleashing the Power of Unused Infrastructure<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/network-ai-era.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">What Kind of Network is Needed in the\u00a0AI Era?<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/osfp-connector.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">OSFP Connector: Ultimate Guide to Amphenol and TE Connectivity Solutions<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/25g-sfp28-cwdm.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">SFP28 25G CWDM Transceiver Module: The Future of Ethernet Connectivity<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/tor-switch.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Revolutionizing Network Infrastructure: A Complete Guide to Top-of-Rack Switching<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/video\/the-use-of-sfp-10g-lr.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Design, construction and use of SFP 10G LR<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/qsfp-vs-qsfp28-vs-qsfp56.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">QSFP+ vs QSFP28 vs QSFP56: What&#8217;s the Difference? (2026)<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/qsfp28-100g-bidi.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Unlocking the Potential of the QSFP28 100G BiDi Transceiver Module<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/100gb-ethernet-switch.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Unlock the Power of Connectivity: Exploring the 100gb Ethernet Switch<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/sfp-10g-zr.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Understanding the Cisco SFP-10G-ZR: A Reliable 10G Optical Transceiver Module for SMF 1550nm Applications<\/span><\/a><\/li>                <\/ul>\r\n                        <\/div>\r\n<\/div>","protected":false},"excerpt":{"rendered":"<p>In general, the letters refer to reach or optics technology, and the number refers to the number of optical channels:SR8: Short Range 8.<\/p>\n","protected":false},"author":5,"featured_media":5711,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":"","_wpscppro_dont_share_socialmedia":false,"_wpscppro_custom_social_share_image":0,"_facebook_share_type":"","_twitter_share_type":"","_linkedin_share_type":"","_pinterest_share_type":"","_linkedin_share_type_page":"","_instagram_share_type":"","_medium_share_type":"","_threads_share_type":"","_google_business_share_type":"","_selected_social_profile":[],"_wpsp_enable_custom_social_template":false,"_wpsp_social_scheduling":{"enabled":false,"datetime":null,"platforms":[],"status":"template_only","dateOption":"today","timeOption":"now","customDays":"","customHours":"","customDate":"","customTime":"","schedulingType":"absolute"},"_wpsp_active_default_template":true},"categories":[320],"tags":[],"class_list":["post-5669","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-questions"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.13 (Yoast SEO v25.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What do the Suffixes SR8, SR4, DR4\u00a0Stand for? | FiberMall<\/title>\n<meta name=\"description\" content=\"In general, the letters refer to reach or optics technology, and the number refers to the number of optical channels:SR8: Short Range 8.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fibermall.com\/questions\/what-do-the-suffixes-sr8-sr4-stand.htm\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What do the Suffixes \u201cSR8, SR8-C, SRBD, SR4, DR4\/XDR4\/PLR4, FR4\/LR4 and 2FR4\u201d\u00a0Stand for?\" \/>\n<meta property=\"og:description\" content=\"In general, the letters refer to reach or optics technology, and the number refers to the number of optical channels:SR8: Short Range 8.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fibermall.com\/questions\/what-do-the-suffixes-sr8-sr4-stand.htm\" \/>\n<meta property=\"og:site_name\" content=\"fibermall.com\" \/>\n<meta property=\"article:published_time\" content=\"2023-09-06T07:32:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-28T10:09:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/09\/400g-modules.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"305\" \/>\n\t<meta property=\"og:image:height\" content=\"165\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Brian\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Brian\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"QAPage\",\"mainEntity\":{\"@type\":\"Question\",\"name\":\"400G Ethernet vs InfiniBand NDR: Which Fabric for AI?\",\"text\":\"Both 400G Ethernet and InfiniBand NDR deliver a nominal bandwidth of 400 Gb\/s per port. However, identical port speeds do not guarantee identical performance in AI training clusters. The differences extend beyond raw bandwidth. InfiniBand uses native RDMA transport and credit-based link-level flow control, while 400G Ethernet typically relies on RoCEv2 with appropriate congestion management [&hellip;]\",\"answerCount\":0,\"upvoteCount\":\"20\",\"dateCreated\":\"2026-10-12\",\"dateModified\":\"2026-10-12\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":null,\"url\":\"https:\/\/www.fibermall.com\/blog\/400g-infiniband-ndr-vs-ethernet.htm\",\"upvoteCount\":\"20\"},\"author\":{\"@type\":\"Person\",\"name\":null,\"upvoteCount\":\"20\"},\"suggestedAnswer\":[]}},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.fibermall.com\/questions\/what-do-the-suffixes-sr8-sr4-stand.htm#primaryimage\",\"url\":\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/09\/400g-modules.jpg\",\"contentUrl\":\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/09\/400g-modules.jpg\",\"width\":305,\"height\":165,\"caption\":\"400g modules\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.fibermall.com\/questions\/what-do-the-suffixes-sr8-sr4-stand.htm#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.fibermall.com\/blog.htm\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What do the Suffixes \u201cSR8, SR8-C, SRBD, SR4, DR4\/XDR4\/PLR4, FR4\/LR4 and 2FR4\u201d\u00a0Stand for?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.fibermall.com\/blog.htm\/#website\",\"url\":\"https:\/\/www.fibermall.com\/blog.htm\/\",\"name\":\"fibermall.com\",\"description\":\"Optical Communication Expert\",\"publisher\":{\"@id\":\"https:\/\/www.fibermall.com\/blog.htm\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.fibermall.com\/blog.htm\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.fibermall.com\/blog.htm\/#organization\",\"name\":\"fibermall.com\",\"url\":\"https:\/\/www.fibermall.com\/blog.htm\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.fibermall.com\/blog.htm\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2024\/12\/cropped-Fiber-Mall-Logo.jpg\",\"contentUrl\":\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2024\/12\/cropped-Fiber-Mall-Logo.jpg\",\"width\":200,\"height\":67,\"caption\":\"fibermall.com\"},\"image\":{\"@id\":\"https:\/\/www.fibermall.com\/blog.htm\/#\/schema\/logo\/image\/\"}}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"What do the Suffixes SR8, SR4, DR4\u00a0Stand for? | FiberMall","description":"In general, the letters refer to reach or optics technology, and the number refers to the number of optical channels:SR8: Short Range 8.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.fibermall.com\/questions\/what-do-the-suffixes-sr8-sr4-stand.htm","og_locale":"en_US","og_type":"article","og_title":"What do the Suffixes \u201cSR8, SR8-C, SRBD, SR4, DR4\/XDR4\/PLR4, FR4\/LR4 and 2FR4\u201d\u00a0Stand for?","og_description":"In general, the letters refer to reach or optics technology, and the number refers to the number of optical channels:SR8: Short Range 8.","og_url":"https:\/\/www.fibermall.com\/questions\/what-do-the-suffixes-sr8-sr4-stand.htm","og_site_name":"fibermall.com","article_published_time":"2023-09-06T07:32:33+00:00","article_modified_time":"2023-09-28T10:09:38+00:00","og_image":[{"width":305,"height":165,"url":"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/09\/400g-modules.jpg","type":"image\/jpeg"}],"author":"Brian","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Brian","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"QAPage","mainEntity":{"@type":"Question","name":"400G Ethernet vs InfiniBand NDR: Which Fabric for AI?","text":"Both 400G Ethernet and InfiniBand NDR deliver a nominal bandwidth of 400 Gb\/s per port. However, identical port speeds do not guarantee identical performance in AI training clusters. The differences extend beyond raw bandwidth. InfiniBand uses native RDMA transport and credit-based link-level flow control, while 400G Ethernet typically relies on RoCEv2 with appropriate congestion management [&hellip;]","answerCount":0,"upvoteCount":"20","dateCreated":"2026-10-12","dateModified":"2026-10-12","acceptedAnswer":{"@type":"Answer","text":null,"url":"https:\/\/www.fibermall.com\/blog\/400g-infiniband-ndr-vs-ethernet.htm","upvoteCount":"20"},"author":{"@type":"Person","name":null,"upvoteCount":"20"},"suggestedAnswer":[]}},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fibermall.com\/questions\/what-do-the-suffixes-sr8-sr4-stand.htm#primaryimage","url":"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/09\/400g-modules.jpg","contentUrl":"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/09\/400g-modules.jpg","width":305,"height":165,"caption":"400g modules"},{"@type":"BreadcrumbList","@id":"https:\/\/www.fibermall.com\/questions\/what-do-the-suffixes-sr8-sr4-stand.htm#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.fibermall.com\/blog.htm"},{"@type":"ListItem","position":2,"name":"What do the Suffixes \u201cSR8, SR8-C, SRBD, SR4, DR4\/XDR4\/PLR4, FR4\/LR4 and 2FR4\u201d\u00a0Stand for?"}]},{"@type":"WebSite","@id":"https:\/\/www.fibermall.com\/blog.htm\/#website","url":"https:\/\/www.fibermall.com\/blog.htm\/","name":"fibermall.com","description":"Optical Communication Expert","publisher":{"@id":"https:\/\/www.fibermall.com\/blog.htm\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.fibermall.com\/blog.htm\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.fibermall.com\/blog.htm\/#organization","name":"fibermall.com","url":"https:\/\/www.fibermall.com\/blog.htm\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fibermall.com\/blog.htm\/#\/schema\/logo\/image\/","url":"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2024\/12\/cropped-Fiber-Mall-Logo.jpg","contentUrl":"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2024\/12\/cropped-Fiber-Mall-Logo.jpg","width":200,"height":67,"caption":"fibermall.com"},"image":{"@id":"https:\/\/www.fibermall.com\/blog.htm\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=\/wp\/v2\/posts\/5669","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5669"}],"version-history":[{"count":7,"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=\/wp\/v2\/posts\/5669\/revisions"}],"predecessor-version":[{"id":10720,"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=\/wp\/v2\/posts\/5669\/revisions\/10720"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=\/wp\/v2\/media\/5711"}],"wp:attachment":[{"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5669"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5669"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fibermall.com\/blog.htm\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}