{"product_id":"400gbase-qsfp-dd-dr4-pam4-optical-transceiver-500m-low-power","title":"400GBase QSFP-DD DR4 PAM4 Optical Transceiver - 500m Low Power","description":"\u003cp\u003eIn this review the QSFPTEK 400GBase QSFP-DD DR4 module is evaluated as a dense-connectivity option for data centers and HPC networks that need a cost-conscious 400G upgrade. The bottom line: this transceiver delivers \u003cstrong\u003e400G Ethernet\u003c\/strong\u003e links up to 500m over single-mode fiber with low power draw, and it is most useful where a QSFP-DD form factor and 4x100G breakout flexibility are required. The review focuses on real-world fit, electrical and optical compatibility, and whether heat and power are reasonable for rack deployments.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePAM4 modulation:\u003c\/strong\u003e Provides the higher per-lane data density that enables 400G performance across four parallel optical lanes while remaining cost effective.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEML + PIN optics:\u003c\/strong\u003e Ensures reliable 1310nm transmission to support links up to 500m over single-mode fiber with MTP\/MPO-12 connectivity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow power consumption:\u003c\/strong\u003e Draws under 10W, which helps reduce cooling and power budget impact in dense switch ports.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4x100G breakout:\u003c\/strong\u003e Supports breaking out to QSFP28 100G-DR, 100G-FR, and 100G-LR modules for flexible port aggregation and migration strategies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQSFP-DD and IEEE compliance:\u003c\/strong\u003e Built to the QSFP-DD MSA and IEEE 802.3bs standard, increasing interchangeability in multi-vendor racks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis module is aimed at network engineers and system integrators working in high-performance computing, hyperscale data centers, or enterprise fabrics that require \u003cstrong\u003e400G Ethernet\u003c\/strong\u003e uplinks with moderate reach. It is particularly useful where MTP\/MPO-12 cabling plants and QSFP-DD ports are already deployed and where breakout to 100G is part of migration planning.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include small offices or edge deployments that do not need 400G capacity or lack QSFP-DD ports, and environments that require longer single-mode reach than 500m or multimode fiber support without additional conversion.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-density 400G capability in a QSFP-DD form factor enables smoother upgrades from 100G architectures.\u003c\/li\u003e\n\u003cli\u003eSupport for 4x100G breakout improves operational flexibility when connecting to existing 100G QSFP28 transceivers.\u003c\/li\u003e\n\u003cli\u003eLow power usage under 10W reduces thermal load compared with some higher-power 400G optics.\u003c\/li\u003e\n\u003cli\u003eStandards compliance with QSFP-DD MSA and IEEE 802.3bs increases interoperability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReach is limited to 500m on single-mode fiber, so it is not suitable for very long-haul links beyond data center fabric spans.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eForm Factor\u003c\/td\u003e\n\u003ctd\u003eQSFP-DD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Rate\u003c\/td\u003e\n\u003ctd\u003e400G (8x 53.125Gb\/s PAM4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e1310nm (EML)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReach\u003c\/td\u003e\n\u003ctd\u003eUp to 500m over SMF with MTP\/MPO-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eMTP\/MPO-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 10W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eQSFP-DD MSA, IEEE 802.3bs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe QSFPTEK 400GBase QSFP-DD DR4 module is a practical choice for organizations upgrading fabric uplinks to \u003cstrong\u003e400G Ethernet\u003c\/strong\u003e where reach needs top out at 500m and power efficiency matters. It offers useful breakout support and standards compliance, making it good value for data centers and HPC clusters that already use QSFP-DD ports and MTP cabling.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this module break out to 100G QSFP28 ports?\u003c\/strong\u003e\u003cbr\u003eYes. It supports 4x100G breakout to QSFP28 100G-DR, 100G-FR, and 100G-LR transceivers for flexible migration paths.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat fiber and connector type are required?\u003c\/strong\u003e\u003cbr\u003eIt uses single-mode fiber with an MTP\/MPO-12 connector and operates at 1310nm for links up to 500m.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this compatible with standard QSFP-DD ports?\u003c\/strong\u003e\u003cbr\u003eYes. The transceiver is compliant with the QSFP-DD MSA and IEEE 802.3bs standards for interoperability.\u003c\/p\u003e","brand":"QSFPTEK","offers":[{"title":"Default Title","offer_id":48201768861915,"sku":"B0B45JFMWK","price":2043.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61sjUiqV3VL._AC_SL1500.jpg?v=1770272703","url":"https:\/\/gearmusthave.com\/products\/400gbase-qsfp-dd-dr4-pam4-optical-transceiver-500m-low-power","provider":"GearMustHave","version":"1.0","type":"link"}