{"product_id":"hpe-qsfp28-to-sfp28-adapter-845970-b21-xvfiq","title":"HPE QSFP28 to SFP28 Adapter - 845970-B21","description":"\u003ch2\u003eHPE QSFP28 to SFP28 Adapter — 845970-B21\u003c\/h2\u003e\u003cp\u003eThe HPE 845970-B21 is the standard option kit for the HPE QSFP28 to SFP28 adapter, enabling a single 100GbE QSFP28 port to connect to a 25GbE SFP28 transceiver or device. This adapter allows network equipment with QSFP28 100GbE ports — switches, NICs, and storage controllers — to interface directly with 25GbE SFP28 endpoints, providing flexible 25GbE connectivity from 100GbE QSFP28 infrastructure without additional cabling or media converters.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eQSFP28 to SFP28 adapter option kit — standard procurement for 25GbE SFP28 from QSFP28 ports\u003c\/li\u003e\n\u003cli\u003eDirect physical adapter — no active electronics, media converters, or external power required\u003c\/li\u003e\n\u003cli\u003eStandard option kit — regional\/revision variant 849444-001 is interchangeable\u003c\/li\u003e\n\u003cli\u003eFlexible 25GbE SFP28 breakout from 100GbE QSFP28 switch and NIC ports\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart Number: 845970-B21\u003c\/li\u003e\n\u003cli\u003eManufacturer: HPE\u003c\/li\u003e\n\u003cli\u003eType: QSFP28 to SFP28 Adapter\u003c\/li\u003e\n\u003cli\u003eInput: QSFP28 (100GbE)\u003c\/li\u003e\n\u003cli\u003eOutput: SFP28 (25GbE)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTransceiver \u0026amp; Interface Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eInput Interface: QSFP28 — plugs into 100GbE QSFP28 port on switch, NIC, or HBA\u003c\/li\u003e\n\u003cli\u003eOutput Interface: SFP28 — accepts 25GbE SFP28 transceiver for 25GbE connectivity\u003c\/li\u003e\n\u003cli\u003eAdapter Type: Passive mechanical adapter — no signal conversion or active electronics\u003c\/li\u003e\n\u003cli\u003eSpeed: Enables single-lane 25GbE via one lane of the QSFP28 four-lane interface\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eUse Cases\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStandard option kit procurement for 25GbE SFP28 connectivity from QSFP28 HPE infrastructure\u003c\/li\u003e\n\u003cli\u003eConnecting 25GbE SFP28 servers or appliances to 100GbE QSFP28 switch ports\u003c\/li\u003e\n\u003cli\u003eFlexible 25GbE breakout from 100GbE QSFP28 without dedicated 25GbE switch ports\u003c\/li\u003e\n\u003cli\u003eField adapter for mixed 25GbE\/100GbE environments using HPE QSFP28-capable switches\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHPE switches and NICs with QSFP28 100GbE ports supporting SFP28 adapter mode\u003c\/li\u003e\n\u003cli\u003eHPE-validated 25GbE SFP28 transceivers for use in the SFP28 output port\u003c\/li\u003e\n\u003cli\u003eInterchangeable with 849444-001 in supported HPE QSFP28 configurations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cdl\u003e\n\u003cdt\u003eIs 845970-B21 interchangeable with 849444-001?\u003c\/dt\u003e\n\u003cdd\u003eYes — 845970-B21 is the standard option kit and 849444-001 is the regional\/revision variant. Both are HPE QSFP28 to SFP28 adapters with identical function — fully interchangeable in supported HPE QSFP28 port configurations.\u003c\/dd\u003e\n\u003cdt\u003eWhat is the maximum distance supported with this adapter?\u003c\/dt\u003e\n\u003cdd\u003eDistance is determined by the SFP28 transceiver inserted into the adapter's SFP28 port — not by the adapter itself. Short-range 25GbE SFP28 SR transceivers support up to 100m over OM4 fiber; long-range LR transceivers support up to 10km. Select the SFP28 transceiver based on your required link distance.\u003c\/dd\u003e\n\u003cdt\u003eCan I use multiple QSFP28 to SFP28 adapters on the same switch?\u003c\/dt\u003e\n\u003cdd\u003eYes — each QSFP28 port can independently use a QSFP28 to SFP28 adapter. However, each adapter uses one full QSFP28 port for a single 25GbE connection. For 4x 25GbE from a single QSFP28 port, a QSFP28 to 4x SFP28 breakout cable is more efficient than four separate adapters on four QSFP28 ports.\u003c\/dd\u003e\n\u003c\/dl\u003e\u003cp\u003eThe HPE 845970-B21 QSFP28 to SFP28 adapter option kit enables flexible 25GbE SFP28 connectivity from 100GbE QSFP28 ports in HPE network infrastructure. Order today — in stock at a competitive price.\u003c\/p\u003e","brand":"HPE","offers":[{"title":"Default Title","offer_id":48094438326433,"sku":"845970-B21","price":0.0,"currency_code":"BRL","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2216\/8673\/files\/HPE-QSFP28-to-SFP28-Adapter-845970-B21.jpg?v=1792132706","url":"https:\/\/www.foxti.com.br\/products\/hpe-qsfp28-to-sfp28-adapter-845970-b21-xvfiq","provider":"FoxTI","version":"1.0","type":"link"}