{"product_id":"qsfptek-40g-qsfp-module-lc-single-mode-transceiver-lr4","title":"QSFPTEK 40G QSFP+ Module LC Single-Mode Transceiver - LR4","description":"\u003cp\u003eIn this review of the QSFPTEK 40G QSFP+ Module LC Single-Mode Transceiver the bottom line is simple: this module is a practical, cost-conscious way to add reliable 40GBASE-LR4 connectivity to Juniper-compatible equipment. It is aimed at network engineers and IT teams who need a hot-pluggable 40GbE link over single-mode fiber to 10km and who value monitoring with \u003cstrong\u003eDDM\u003c\/strong\u003e. The review focuses on real-world fit, interoperability with Juniper QSFPP-40GBASE-LR4 and EX-QSFP-40GE-LR4 listings, and the module's operational range and thermal tolerance.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eJuniper compatibility:\u003c\/strong\u003e Built to work with Juniper QSFPP-40GBASE-LR4 and EX-QSFP-40GE-LR4 ports, reducing the risk of vendor lock issues when replacing optics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40GbE performance:\u003c\/strong\u003e Supports full 40Gb\/s data rate across four CWDM lanes for aggregated high-throughput links.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong reach:\u003c\/strong\u003e Single-mode LC duplex connector and LR4 design deliver reliable links up to 10km over SMF for campus and metro spans.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperational monitoring:\u003c\/strong\u003e DDM support provides real-time access to Tx\/Rx and temperature values so administrators can spot problems early.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards compliance:\u003c\/strong\u003e Conforms to IEEE 802.3ba, SFF-8436 and the QSFP MSA, which helps ensure predictable behavior in standard QSFP+ ports.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial useability:\u003c\/strong\u003e Hot-pluggable design and a 0C to 70C operating range make it suitable for typical data center and wiring closet environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe QSFPTEK LR4 module is best for network engineers, system integrators, and IT teams that need a cost-effective replacement or spare for Juniper-compatible 40Gb QSFP+ ports. It is a sensible choice for linking switches, routers, servers, or NICs across single-mode fiber runs where up to 10km reach is required.\u003c\/p\u003e\u003cp\u003eIt is not targeted at installers who need multimode connectivity, very long haul links beyond 10km, or proprietary optics that require vendor-locked firmware. Users who require extended temperature ranges below 0C or above 70C should consider specialized industrial modules.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Juniper QSFPP-40GBASE-LR4 listings, easing swaps and inventory consolidation.\u003c\/li\u003e\n\u003cli\u003eSupports 40Gb\/s across 4 CWDM lanes with duplex LC connectors for standard SMF deployments.\u003c\/li\u003e\n\u003cli\u003eDDM support allows live monitoring of key operating parameters to help prevent failures.\u003c\/li\u003e\n\u003cli\u003eIndividually tested and backed by a 3-year warranty and lifetime tech support for peace of mind.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eReach is limited to 10km, so it is not suitable for longer metro or long-haul links.\u003c\/li\u003e\n\u003cli\u003eOperating temperature tops at 70C, which may be restrictive for some extreme industrial environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eData rate\u003c\/td\u003e\n\u003ctd\u003e40Gb\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e4 CWDM lanes: 1270nm, 1290nm, 1310nm, 1330nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eDuplex LC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReach\u003c\/td\u003e\n\u003ctd\u003eUp to 10km over single-mode fiber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMonitoring\u003c\/td\u003e\n\u003ctd\u003eDDM (digital diagnostics)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eIEEE 802.3ba, SFF-8436, QSFP MSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e0C to +70C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe QSFPTEK 40G QSFP+ LR4 transceiver is a pragmatic, value-oriented optic for teams needing Juniper-compatible 40GbE links to 10km. With standards compliance, DDM monitoring, and individual testing plus a 3-year warranty, it delivers dependable performance for data center and campus aggregation without the premium of first-party optics. Choose it for routine 40GbE single-mode links; look elsewhere for extended reach or extreme temperature tolerance.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this module compatible with Juniper QSFPP-40GBASE-LR4 ports?\u003c\/strong\u003e\u003cbr\u003eYes, it is listed as compatible with Juniper QSFPP-40GBASE-LR4 and EX-QSFP-40GE-LR4 ports.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow far can this transceiver reach?\u003c\/strong\u003e\u003cbr\u003eIt supports single-mode fiber links up to 10km in typical deployments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it provide diagnostic monitoring?\u003c\/strong\u003e\u003cbr\u003eYes, the module supports DDM so you can monitor Tx\/Rx power and temperature remotely.\u003c\/p\u003e","brand":"QSFPTEK","offers":[{"title":"Default Title","offer_id":48620502581467,"sku":"B07QTHBWV4","price":109.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61zyqpVaIgS._AC_SL1500.jpg?v=1778458471","url":"https:\/\/gearmusthave.com\/products\/qsfptek-40g-qsfp-module-lc-single-mode-transceiver-lr4","provider":"GearMustHave","version":"1.0","type":"link"}