The NVIDIA/Mellanox compatible QSFP28 to SFP28 adapter converter module provides 25G Ethernet connectivity for QSFP28 100G ports. This module is compliant with QSFP28 MSA SFF-8665 and SFP28 MSA SFF-8432. The built-in MCU enables I2C reading of SFP28 registers by reading QSA registers. The high-speed data channel of the SFP28 receptacle is connected to lane 1 of the QSFP28 connector. The other three channels on the QSFP28 connector are not connected.
Note 1: A CVR without registers will display the system's built-in module information, whereas a CVR with registers may not.
QSFP28-SFP28-CVR Overall Introduction | FS 
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Product Highlights
Max. Power Consumption 1.5W Without Module
Use SFP28 in QSFP28 Port of Your Device
Tested in Switches for Superior Performance and Reliability
Works out of the Box, No Configuration Needed
Extended Temperature Range -20°C to 85°C
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NVIDIA/Mellanox MAM1Q00A-QSA28 Compatible 100G QSFP28 to 25G SFP28 Adapter Converter Module
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Please Note: Installing a third party transceiver does not void your network equipment warranty. Network equipment manufacturers all have guidelines stating that warranty support on their products will not be affected.
NVIDIA/Mellanox MAM1Q00A-QSA28 Compatible QSFP28 100G to SFP28 25G Ethernet Adapter Converter Module with DDMI
MAM1Q00A-QSA28NVIDIA/Mellanox (Ethernet)
US$99.00