{"product_id":"mikrotik-crs312-4c-8xg-rm-12-port-10gbe-rj45-sfp-plus-switch-refurbished","title":"MikroTik CRS312-4C+8XG-RM 12-Port 10GbE Switch — 8x 10G RJ45 + 4x SFP+\/RJ45 Combo, Dual PSU, Refurbished","description":"\u003cp\u003e\u003cstrong\u003e12 ports of 10G over the copper you already have — with four SFP+ combo ports for fiber or DAC\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMikroTik CRS312-4C+8XG-RM — 8x 10GBASE-T + 4x 10G combo (SFP+ or RJ45), 1U, dual power\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"border-left: 3px solid #1e8f5e; background: #f7f8fa; padding: 10px 14px; margin: 14px 0;\"\u003e→ \u003cstrong\u003eCombo ports are either\/or.\u003c\/strong\u003e Each of the four combo ports has an SFP+ cage and an RJ45 jack, and only one can be active at a time. If both are plugged in, the SFP+ side wins unless you choose otherwise in RouterOS.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e CRS312-4C+8XG-RM\u003cbr\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e MikroTik Cloud Router Switch, 8x 1\/2.5\/5\/10G RJ45, 4x 10G combo (SFP+ or 10G RJ45), 1x 10\/100 management, dual AC power, 1U rackmount\u003c\/p\u003e\n\u003cp\u003eThe CRS312-4C+8XG-RM was MikroTik's first switch with 10G RJ45 ports. It is the straightforward way to move a rack, studio or office core from 1 Gigabit to 10 Gigabit over existing copper, while keeping up to four SFP+ ports for fiber or DAC uplinks.\u003c\/p\u003e\n\u003cp\u003eThe eight RJ45 ports also negotiate 1, 2.5 and 5G, so older NICs and multi-gig access points keep working. It dual-boots RouterOS (license level 5) or the simpler SwOS, and has redundant power supplies.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhich One Do I Need?\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eIf you need\u003c\/th\u003e\n\u003cth\u003eThis switch?\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e10GBASE-T to servers, NAS or workstations over Cat6A\u003c\/td\u003e\n\u003ctd\u003eYes — 8 RJ45 ports, plus the 4 combo ports in RJ45 mode for up to 12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSFP+ fiber or DAC uplinks\u003c\/td\u003e\n\u003ctd\u003eYes — up to 4, using the combo ports in SFP+ mode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePoE to access points or cameras\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eNo\u003c\/strong\u003e — this switch does not supply PoE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25G or 100G uplinks\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eNo\u003c\/strong\u003e — every port tops out at 10G\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLayer 3 routing on the switch\u003c\/td\u003e\n\u003ctd\u003eYes, under RouterOS; SwOS is switching only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eCRS312-4C+8XG-RM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRJ45 ports\u003c\/td\u003e\n\u003ctd\u003e8x 1\/2.5\/5\/10GBASE-T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombo ports\u003c\/td\u003e\n\u003ctd\u003e4x 10G, each SFP+ or 10G RJ45, one at a time\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManagement port\u003c\/td\u003e\n\u003ctd\u003e1x 10\/100 Ethernet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNon-blocking throughput\u003c\/td\u003e\n\u003ctd\u003e120 Gbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching capacity\u003c\/td\u003e\n\u003ctd\u003e240 Gbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForwarding rate\u003c\/td\u003e\n\u003ctd\u003e178 Mpps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitch chip\u003c\/td\u003e\n\u003ctd\u003eMarvell 98DX8212\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCPU\u003c\/td\u003e\n\u003ctd\u003eQCA9531, 650MHz, single core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRAM \/ storage\u003c\/td\u003e\n\u003ctd\u003e64MB RAM \/ 16MB flash per the original brochure; MikroTik's current spec lists 128MB \/ 32MB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating system\u003c\/td\u003e\n\u003ctd\u003eRouterOS (license level 5) or SwOS, dual boot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e2x AC inputs, 100–240V, redundant · 60W max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling\u003c\/td\u003e\n\u003ctd\u003e4 fans\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther ports\u003c\/td\u003e\n\u003ctd\u003eUSB Type-A, RJ45 serial console\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e443 x 183 x 44mm, 1U rackmount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTested ambient temperature\u003c\/td\u003e\n\u003ctd\u003e-30°C to 70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eCE, EAC, RoHS\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\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLifetime, backed by Resilient Tec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eSource: MikroTik \u003ca href=\"https:\/\/mikrotik.com\/product\/crs312_4c_8xg_rm\" target=\"_blank\" rel=\"noopener\"\u003eCRS312-4C+8XG-RM product page\u003c\/a\u003e, \u003ca href=\"https:\/\/cdn.mikrotik.com\/web-assets\/product_files\/CRS312-4C8XG-RM_220517.pdf\" target=\"_blank\" rel=\"noopener\"\u003ebrochure\u003c\/a\u003e and \u003ca href=\"https:\/\/cdn.mikrotik.com\/web-assets\/product_files\/CRS312-4Cplus8XG-RM-qg_190711.pdf\" target=\"_blank\" rel=\"noopener\"\u003equick guide\u003c\/a\u003e.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eNote on Throughput: 120 Gbps or 240 Gbps?\u003c\/h2\u003e\n\u003cp\u003eMikroTik quotes 120 Gbps of non-blocking throughput and 240 Gbps of switching capacity. They describe the same thing: 12 ports x 10G is 120 Gbps in one direction and 240 Gbps counting both directions. Every port can run at line rate at the same time.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eGood to Know\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e10GBASE-T needs the right cable.\u003c\/strong\u003e Plan on Cat6A or better for full 10G at distance on the RJ45 ports.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombo ports are either\/or.\u003c\/strong\u003e Four combo ports give you four connections, not eight. In RouterOS you can pick which side of each combo is active.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRouterOS or SwOS.\u003c\/strong\u003e RouterOS gives full routing and switching features; SwOS is a lighter switch-only OS. You choose which one boots.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombo SFP+ ports take standard 10G optics and DACs.\u003c\/strong\u003e MikroTik publishes an SFP module compatibility table if you want to check a specific part.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eQuick Checklist — Is This the Right Switch?\u003c\/h2\u003e\n\u003cp\u003eYou want 10G to up to 12 devices in 1U. Most of your runs are copper (Cat6A), with up to four fiber or DAC links. You do not need PoE or anything faster than 10G. You want redundant power and the option of routing under RouterOS.\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\u003eRefurbished and shipped from Resilient Tec in Knoxville, TN · Free standard shipping on US orders.\u003c\/strong\u003e\u003cbr\u003eBuying several, or pairing this with NICs and cabling? Tell us what you are connecting and we will quote it together. \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. On switches that means advance replacement when we have one in stock, otherwise repair or replacement with an equivalent unit, from a named seller in the US.\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\/cat-6a-utp-slim\"\u003eCat 6A UTP slim patch cable\u003c\/a\u003e — for the 10GBASE-T ports\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/1-meter-om4-fiber-cable-lc-to-lc-om4-lclc-01\"\u003eOM4 LC-to-LC fiber patch cable\u003c\/a\u003e — for SR optics in the combo ports\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/dac-cables\"\u003eDAC cables\u003c\/a\u003e and \u003ca href=\"\/collections\/transceivers\"\u003eSFP+ transceivers\u003c\/a\u003e for the four combo ports\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/ethernet-cabling-guide\"\u003eEthernet Cabling Guide\u003c\/a\u003e — choosing a cable category for 10G copper\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/product-guides\"\u003eProduct guides\u003c\/a\u003e — structured cabling, switches and the rest of the rack\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/news\/why-does-the-same-transceiver-work-in-one-switch-and-get-rejected-on-another-2026-vendor-lock-in-guide\"\u003eWhy Does the Same Transceiver Work in One Switch and Get Rejected on Another? (2026 Vendor Lock-In Guide)\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/news\/dac-vs-aoc-vs-aec-ai-rack-guide\"\u003eDAC vs AOC vs AEC: Which Cable Goes Where in an AI Rack? (2026 Buyer's Guide)\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/ethernet-cabling-guide\"\u003eEthernet Cabling Guide\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/network-switches-guide\"\u003eNetwork Switches Guide\u003c\/a\u003e\u003c\/p\u003e","brand":"MikroTik","offers":[{"title":"Default Title","offer_id":68123366850660,"sku":"CRS312-4C+8XG-RM-R","price":529.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/3482\/4548\/files\/CRS312-4Cplus8XG-RM_1.jpg?v=1794407845","url":"https:\/\/resilient-tec.com\/products\/mikrotik-crs312-4c-8xg-rm-12-port-10gbe-rj45-sfp-plus-switch-refurbished","provider":"Resilient Tec","version":"1.0","type":"link"}