{"product_id":"finisar-qsfp-40g-sr4-40gbase-sr4-qsfp-transceiver-new-open-box","title":"Finisar QSFP-40G-SR4 40GBASE-SR4 QSFP+ Transceiver — MPO-12, 850nm MMF, New Open Box","description":"\u003cp\u003e\u003cstrong\u003eFinisar 40GBASE-SR4 — parallel MMF \/ MPO, not BiDi duplex LC\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinisar QSFP-40G-SR4 — 40G QSFP+ SR4 transceiver, New Open Box\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Finisar (now Coherent)\u003cbr\u003e\u003cstrong\u003eCommon PID \/ form:\u003c\/strong\u003e QSFP-40G-SR4 · FTL410QE-class 40GBASE-SR4\u003cbr\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e Hot-pluggable QSFP+, 40GbE over parallel multimode fiber, MPO-12, 850 nm VCSEL\u003c\/p\u003e\n\u003cp\u003eThis is a \u003cstrong\u003eFinisar\u003c\/strong\u003e 40G SR4 module — four 10G lanes over an \u003cstrong\u003eMPO-12\u003c\/strong\u003e ribbon for short-reach multimode links. It is \u003cstrong\u003eNew Open Box\u003c\/strong\u003e (unused module, packaging opened), distinct from any Cisco QSFP-40G-SR4 listing we carry. If your plant is duplex LC multimode and you expected BiDi, this is the wrong optic.\u003c\/p\u003e\n\u003cp\u003eMSA QSFP+ \/ IEEE 802.3ba 40GBASE-SR4. Lifetime warranty from Resilient Tec.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhich One Do I Need?\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eGoing into\u003c\/th\u003e\n\u003cth\u003eYou need\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e40G QSFP+ port, parallel OM3\/OM4 with MPO-12, Finisar \/ MSA SR4\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eFinisar QSFP-40G-SR4\u003c\/strong\u003e — this product (New Open Box)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSame 40G SR4 optics, but you specifically need Cisco-coded OEM stock\u003c\/td\u003e\n\u003ctd\u003e\n\u003ca href=\"\/products\/cisco-qsfp-40g-sr4-40gbase-sr4-qsfp-transceiver-new-copy\"\u003eCisco QSFP-40G-SR4 (Refurbished)\u003c\/a\u003e or \u003ca href=\"\/products\/cisco-qsfp-40g-sr4-40gbase-sr4-qsfp-transceiver-new\"\u003eCisco QSFP-40G-SR4 (New)\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReuse existing duplex LC MMF (no MPO plant) for 40G\u003c\/td\u003e\n\u003ctd\u003e\n\u003ca href=\"\/products\/cisco-qsfp-40g-sr-bd-40gbase-sr-bidi-qsfp-transceiver-refurbished\"\u003eCisco QSFP-40G-SR-BD BiDi\u003c\/a\u003e — \u003cstrong\u003enot SR4\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e100G parallel MMF instead of 40G\u003c\/td\u003e\n\u003ctd\u003e\n\u003ca href=\"\/products\/qsfp28-sr4-100g-100gbase-sr4-qsfp28-transceiver-refurbished\"\u003eQSFP28-SR4-100G\u003c\/a\u003e — different rate \/ cage generation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eMPO SR4 vs LC BiDi is the first fork at 40G multimode.\u003c\/strong\u003e SR4 needs 8 fibers (MPO). BiDi reuses two-strand duplex LC. Ordering SR4 for a duplex-LC-only closet is the most common wrong order on this family.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eQSFP-40G-SR4 (Finisar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForm Factor\u003c\/td\u003e\n\u003ctd\u003eQSFP+ (hot-pluggable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthernet Standard\u003c\/td\u003e\n\u003ctd\u003eIEEE 802.3ba 40GBASE-SR4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Rate\u003c\/td\u003e\n\u003ctd\u003e40 Gbps (4 × 10.3125 Gb\/s); breakout to 4×10GBASE-SR supported on capable hosts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e850 nm (840–860 nm VCSEL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eMPO\/MTP-12 (parallel MMF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiber \/ Reach\u003c\/td\u003e\n\u003ctd\u003e100 m OM3 · 150 m OM4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDOM \/ DDM\u003c\/td\u003e\n\u003ctd\u003eSupported (Tx\/Rx power monitoring typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 1–1.5 W class (Finisar Gen2\/Gen4 SR4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0°C to 70°C (commercial)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eQSFP+ MSA, IEEE 802.3ba, RoHS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLifetime, backed by Resilient Tec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eNew Open Box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eNote on Reach: OM3 100 m vs OM4 150 m\u003c\/h2\u003e\n\u003cp\u003eIEEE 40GBASE-SR4 rates \u003cstrong\u003e100 m on OM3\u003c\/strong\u003e and \u003cstrong\u003e150 m on OM4\u003c\/strong\u003e. Extra MPO matings and poor end-face cleanliness eat margin fast on parallel optics — design to the fiber grade you actually have, not the headline number on the datasheet.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eGood to Know\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew Open Box\u003c\/strong\u003e means unused hardware with opened retail\/OEM packaging — not refurbished pull, not sealed retail new-in-box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is Finisar, not Cisco.\u003c\/strong\u003e We also stock Cisco QSFP-40G-SR4 separately. Match coding to your platform matrix.\u003c\/li\u003e\n\u003cli\u003eBreakout to 4×10GBASE-SR is common on leaf\/spine hosts that support it — confirm your switch supports fan-out before you order breakout harnesses.\u003c\/li\u003e\n\u003cli\u003eMPO polarity (Type B typically for SR4) and pinned vs unpinned must match your trunks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eQuick Checklist — Is This the Right Module?\u003c\/h2\u003e\n\u003cp\u003eYou need \u003cstrong\u003e40GBASE-SR4\u003c\/strong\u003e in a \u003cstrong\u003eQSFP+\u003c\/strong\u003e cage. Your fiber is \u003cstrong\u003eparallel OM3\/OM4 with MPO-12\u003c\/strong\u003e. Finisar \/ MSA coding is acceptable. You want \u003cstrong\u003eNew Open Box\u003c\/strong\u003e condition. You are \u003cstrong\u003enot\u003c\/strong\u003e trying to reuse duplex LC BiDi plant.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eAvailability\u003c\/h2\u003e\n\u003cp style=\"border-left: 3px solid #1e8f5e; background: #f7f8fa; padding: 10px 14px; margin: 14px 0;\"\u003e\u003cstrong\u003eIn stock at Resilient Tec · Ships from Knoxville, TN.\u003c\/strong\u003e\u003cbr\u003eDeep Finisar SR4 stock — ask for a kit quote if you are filling a row. \u003ca href=\"\/pages\/request-a-quote\"\u003e\u003cstrong\u003eRequest a quote →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e lifetime, \u003ca href=\"\/pages\/lifetime-warranty\"\u003ebacked by Resilient Tec\u003c\/a\u003e.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eYou Might Also Need\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/cisco-qsfp-40g-sr4-40gbase-sr4-qsfp-transceiver-new\"\u003eCisco QSFP-40G-SR4 — New\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/cisco-qsfp-40g-sr4-40gbase-sr4-qsfp-transceiver-new-copy\"\u003eCisco QSFP-40G-SR4 — Refurbished\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/cisco-qsfp-40g-sr-bd-40gbase-sr-bidi-qsfp-transceiver-refurbished\"\u003eCisco QSFP-40G-SR-BD BiDi — Refurbished\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/arista-qsfp-40g-srbd-xvr-10066-20-40gbase-bidi-qsfp-transceiver-40gbe-bi-directional-over-duplex-mmf-150m\"\u003eArista QSFP-40G-SRBD BiDi — Refurbished\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/product-guides\"\u003eProduct guides\u003c\/a\u003e · \u003ca href=\"\/pages\/request-a-quote\"\u003eRequest a quote\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/lifetime-warranty\"\u003eLifetime warranty — how Resilient Tec backs what we sell\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/request-a-quote\"\u003eRequest a quote for 40G QSFP+ fills and spare kits\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/product-guides\"\u003eProduct guides\u003c\/a\u003e\u003c\/p\u003e\n","brand":"Finisar","offers":[{"title":"Default Title","offer_id":67603159449700,"sku":"QSFP-40G-SR4-FIN-NOB","price":29.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/resilient-tec.com\/products\/finisar-qsfp-40g-sr4-40gbase-sr4-qsfp-transceiver-new-open-box","provider":"Resilient Tec","version":"1.0","type":"link"}