{"product_id":"100g-qsfp28-dac-cable-cr4-qsfp28-to-qsfp28-passive-3-meter-reliable","title":"100G QSFP28 DAC Cable CR4 QSFP28 to QSFP28 Passive 3-Meter - Reliable","description":"\u003cp\u003eIn this review of the 100G QSFP28 DAC Cable CR4, the bottom line is straightforward: this passive QSFP28-to-QSFP28 twinax cable is for network engineers and data center technicians who need a dependable, low-latency 100-Gigabit link for short runs inside racks or between adjacent racks. The reviewer found the 3-meter length and AWG30 construction appropriate for very short links, and the fact that each cable is TDR and VNA tested and individually validated on switches before delivery provides clear reassurance for critical deployments.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% Arista compatible:\u003c\/strong\u003e Works as a direct replacement for CAB-Q-Q-100G-3M to ensure straightforward interoperability with Arista 100G ports.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassive twinax design:\u003c\/strong\u003e Provides a cost-effective, power-free option for establishing a 100GBASE-CR4 connection over short distances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-meter length:\u003c\/strong\u003e Suited for intra-rack and adjacent-rack connections where a precise 3 m span is required without excess cable slack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLaboratory tested:\u003c\/strong\u003e Each cable passes TDR and VNA tests in Macroreer's signal integrity lab, helping reduce uncertainty in deployment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndividual switch validation:\u003c\/strong\u003e Every DAC is tested on switches before shipping, lowering the risk of DOA hardware in production racks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupport and warranty:\u003c\/strong\u003e Comes with a 30-day return period, five-year warranty, and lifetime technology support for long-term peace of mind.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis cable is aimed at data center operators, network administrators, and systems integrators who need a short, reliable 100G link between QSFP-100G ports, especially in rack-to-rack or intra-rack scenarios. It is a practical choice when cost and low latency matter and when fiber or active optical cabling is not required for the short run.\u003c\/p\u003e\n\u003cp\u003eThose who need longer reach (beyond a few meters), highly flexible field terminations, or optical isolation should look at AOC or fiber solutions instead. This passive twinax cable is not intended for long-distance backbone links or environments where electromagnetic isolation is mandatory.\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\u003eDirect compatibility with Arista 100G ports makes swaps and replacements simple.\u003c\/li\u003e\n\u003cli\u003ePassive design eliminates the need for extra power and reduces potential points of failure.\u003c\/li\u003e\n\u003cli\u003eRigorous lab testing (TDR and VNA) and per-unit switch validation increase deployment confidence.\u003c\/li\u003e\n\u003cli\u003eStrong support policy with a five-year warranty and lifetime tech support backs the product.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLimited to very short links; not suitable for longer spans where active optics or fiber are required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector type\u003c\/td\u003e\n\u003ctd\u003eQSFP28 to QSFP28\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e100GBASE-CR4, SFF-SFF-8436 compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e3-meter (9.9 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire gauge\u003c\/td\u003e\n\u003ctd\u003eAWG30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eReplacement for CAB-Q-Q-100G-3M, compatible with Arista 100G\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTesting\u003c\/td\u003e\n\u003ctd\u003eTDR \u0026amp; VNA lab tested; each unit tested on switches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e30-day returns, 5-year warranty, lifetime tech support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 100G QSFP28 DAC Cable CR4 is a sensible, value-driven choice for short 100G connections inside racks or between adjacent racks. Its passive twinax construction, formal lab testing, and per-unit switch validation make it a low-risk option for production environments where distance constraints fit. For anyone replacing an CAB-Q-Q-100G-3M or wiring tight rack layouts, it offers reliable performance at a lower cost than longer-reach alternatives.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this cable compatible with Arista switches?\u003c\/strong\u003e\u003cbr\u003eYes. It is specified as fully compatible and as a replacement for CAB-Q-Q-100G-3M on Arista 100G ports.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this cable run beyond 3 meters?\u003c\/strong\u003e\u003cbr\u003eNo. This listing is for a 3-meter passive twinax cable; passive twinax is intended for very short links and longer runs require active optics or fiber.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes each cable get tested before shipping?\u003c\/strong\u003e\u003cbr\u003eYes. Macroreer reports TDR and VNA lab testing and individual testing on switches before delivery.\u003c\/p\u003e","brand":"Macroreer","offers":[{"title":"Default Title","offer_id":48751172059355,"sku":"B07Y347KQ8","price":48.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71SuxgTEINL._SL1500_51a67969-c604-4926-afe2-2fc95138e6b7.jpg?v=1778765718","url":"https:\/\/gearmusthave.com\/products\/100g-qsfp28-dac-cable-cr4-qsfp28-to-qsfp28-passive-3-meter-reliable","provider":"GearMustHave","version":"1.0","type":"link"}