{"product_id":"100gqsfp28e-cw4-arista-100g-cwdm4-qsfp28-transceiver-refurbished","title":"Arista 100GQSFP28E-CW4 100GBASE-CWDM4 QSFP28 Transceiver — 2km SMF, Duplex LC, Refurbished","description":"\u003cp\u003e\u003cstrong\u003e100G CWDM4 over duplex SMF — 2 km class, not SR4 parallel MMF\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eArista 100GQSFP28E-CW4 — 100GBASE-CWDM4 QSFP28 transceiver, refurbished\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eArista \/ E-series Part Number:\u003c\/strong\u003e 100GQSFP28E-CW4\u003cbr\u003e\u003cstrong\u003eCommon aliases:\u003c\/strong\u003e QSFP-100G-CWDM4 · 100G-CWDM4\u003cbr\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e Hot-pluggable QSFP28, 100GbE over duplex single-mode fiber, CWDM4 MSA, duplex LC\u003c\/p\u003e\n\u003cp\u003eThis is the \u003cstrong\u003eCWDM4\u003c\/strong\u003e 100G optic — four CWDM lanes muxed onto one duplex LC SMF pair for up to \u003cstrong\u003e2 km\u003c\/strong\u003e. It is not an SR4 (parallel MMF \/ MPO), not a full 10 km LR4, and not a BiDi. If your plant is OM3\/OM4 ribbon with MPO, this part will not match the connector or the fiber type.\u003c\/p\u003e\n\u003cp\u003eRefurbished, tested, and coded for Arista QSFP28 ecosystems. 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\u003eArista (or Arista-coded) 100G QSFP28 port, duplex SMF, runs ≤ ~2 km\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e100GQSFP28E-CW4\u003c\/strong\u003e — this product (CWDM4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSame cages, but you need full 10 km LAN-WDM LR4\u003c\/td\u003e\n\u003ctd\u003e\n\u003ca href=\"\/products\/100gqsfp28e-lr4s-arista-100g-lr4-qsfp28-transceiver-refurbished\"\u003e100GQSFP28E-LR4S\u003c\/a\u003e — LR4 10 km, not CWDM4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShort-reach parallel MMF (MPO-12, OM3\/OM4)\u003c\/td\u003e\n\u003ctd\u003e\n\u003ca href=\"\/products\/qsfp28-sr4-100g-100gbase-sr4-qsfp28-transceiver-refurbished\"\u003eQSFP28-SR4-100G\u003c\/a\u003e — \u003cstrong\u003enot this module\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReuse existing duplex MMF LC plant for 40G (not 100G SMF)\u003c\/td\u003e\n\u003ctd\u003e\n\u003ca href=\"\/products\/cisco-qsfp-40g-sr-bd-40gbase-sr-bidi-qsfp-transceiver-refurbished\"\u003eQSFP-40G-SR-BD BiDi\u003c\/a\u003e — different rate and media\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eCWDM4 vs LR4 is the first fork on 100G duplex SMF.\u003c\/strong\u003e Both use duplex LC. CWDM4 is the 2 km \/ CWDM grid part; LR4 is the 10 km \/ LAN-WDM part. Ordering LR4 when your run is 800 m and your BOM says CWDM4 wastes budget; ordering CWDM4 for a 8 km campus link will not make distance.\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\u003e100GQSFP28E-CW4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForm Factor\u003c\/td\u003e\n\u003ctd\u003eQSFP28 (hot-pluggable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthernet Standard\u003c\/td\u003e\n\u003ctd\u003e100GBASE-CWDM4 (CWDM4 MSA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Rate\u003c\/td\u003e\n\u003ctd\u003e100 Gbps (4 × 25.78125 Gb\/s NRZ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelengths\u003c\/td\u003e\n\u003ctd\u003e1271 \/ 1291 \/ 1311 \/ 1331 nm (CWDM grid)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eDuplex LC\/UPC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiber \/ Reach\u003c\/td\u003e\n\u003ctd\u003eUp to 2 km over duplex SMF (G.652); host FEC typically required for rated reach\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDOM \/ DDM\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e~3.5 W max class\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\u003eQSFP28 MSA, CWDM4 MSA, IEEE 802.3bm class, 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\u003eRefurbished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eNote on Reach: Why CWDM4 Stops at 2 km\u003c\/h2\u003e\n\u003cp\u003eCWDM4 was designed as the cost-efficient duplex-SMF 100G optic for \u003cstrong\u003eintra-campus and DCI-lite\u003c\/strong\u003e runs — not as a substitute for 10 km LR4. The MSA rates \u003cstrong\u003e2 km\u003c\/strong\u003e on G.652 with host FEC. Past that, move to LR4 \/ XCWDM4 \/ ER class optics. Do not stretch a CWDM4 module past 2 km and hope; the link budget is not there for production fabrics.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eGood to Know\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuplex LC SMF only.\u003c\/strong\u003e This is not an MPO SR4 module. If your patch panel is MPO-12 multimode, you want SR4, not CWDM4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFEC:\u003c\/strong\u003e Rated 2 km CWDM4 reach assumes host FEC per the MSA. Confirm your platform has FEC enabled for 100G.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot interchangeable with LR4 by accident.\u003c\/strong\u003e Same cage and same LC connector — different wavelength plan and reach. Match the PID on the BOM.\u003c\/li\u003e\n\u003cli\u003eRefurbished means previously deployed hardware, cleaned, tested, and re-warranted by us — not “seller unverified used.”\u003c\/li\u003e\n\u003cli\u003eAlways confirm against your Arista EOS \/ platform optics matrix for production use.\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 have a \u003cstrong\u003e100G QSFP28\u003c\/strong\u003e port that accepts Arista CWDM4 coding. Your fiber is \u003cstrong\u003eduplex single-mode\u003c\/strong\u003e with \u003cstrong\u003eLC\u003c\/strong\u003e connectors. The run is \u003cstrong\u003e2 km or less\u003c\/strong\u003e. Your BOM or matrix calls \u003cstrong\u003e100GQSFP28E-CW4\u003c\/strong\u003e \/ QSFP-100G-CWDM4. You are \u003cstrong\u003enot\u003c\/strong\u003e filling an MPO SR4 or 10 km LR4 requirement.\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\u003eFilling a spare kit or a row of leaf ports? Tell us how many CWDM4 vs LR4 vs SR4 you need and we will quote the set. \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 — not a manufacturer term. When a module fails you reach a named seller in the US, not a ticket queue.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eYou Might Also Need\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/100gqsfp28e-lr4s-arista-100g-lr4-qsfp28-transceiver-refurbished\"\u003e100GQSFP28E-LR4S — Arista 100G LR4 QSFP28, Refurbished\u003c\/a\u003e — 10 km LAN-WDM sibling\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/qsfp28-sr4-100g-100gbase-sr4-qsfp28-transceiver-refurbished\"\u003eQSFP28-SR4-100G — 100G SR4 QSFP28, Refurbished\u003c\/a\u003e — parallel MMF \/ MPO\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/qsfp-100g-lr4-s-cisco-compatible-100g-qsfp28-lr4-transceiver-10km\"\u003eCisco QSFP-100G-LR4-S Compatible — 100G LR4, 10 km\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 100G QSFP28 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":"Arista","offers":[{"title":"Default Title","offer_id":67603159384164,"sku":"100GQSFP28E-CW4-R","price":34.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/resilient-tec.com\/products\/100gqsfp28e-cw4-arista-100g-cwdm4-qsfp28-transceiver-refurbished","provider":"Resilient Tec","version":"1.0","type":"link"}