The NVIDIA Mellanox MAM1000A-QSA (Quad to Serial Adapter) is a passive, mechanical adapter that enables a single-channel SFP/SFP+ device to be connected to a 40 Gigabit Ethernet QSFP+ port. It is designed to bridge legacy 10G equipment to newer high-speed 40G network infrastructure.
The "B2" designation in your part number refers to a specific hardware revision or configuration variant. The serial number AF301650806 is the unique manufacturing identifier for this individual unit.
The QSA is a passive module with a QSFP+ male connector on one side and an SFP+ female connector on the other. It functions essentially as a zero-length hybrid cable that requires no additional port power.
Key FeaturesFeatureDescriptionTypePassive mechanical adapterForm FactorQSFP+ to SFP+Speed Conversion40 GbE to 10 GbEPowerNo additional power required (passive); only EEPROM for ID consumes minimal powerHot-PluggableYes, supports plug-and-play functionalityLatencyNear-zero latency and insertion lossTemperature RangeExtended temperature versions available for hotter environmentsCompatibilityWorks with SFP+, SFP, SFP28 DACs, AOCs, transceivers, and BASE-T modulesTechnical SpecificationsElectrical & PhysicalParameterSpecificationData Rate Support40GbE QSFP+ to 10GbE SFP+Power ConsumptionPassive; <0.1W (typical, only EEPROM)Operating Temperature0°C to 70°C (standard); extended versions up to 85°C availableStorage Temperature-40°C to 85°CSupply Voltage (Vcc)3.3VMechanical Dimensions
The QSA adapter follows standard QSFP mechanical mmWidth~32.6 mmHeight~10.00 mmConnector Pin Mapping
The QSA connects only Lane 1 of the QSFP+ port to the SFP+ interface. The other three lanes are terminated and not used.
QSFP28 SideSFP28
