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The SFP28 transceivers are high-performance, cost-effective modules supporting a data rate of 25.78125Gbps and 10km transmission distance with SMF. The transceiver consists of three sections: an Un-cooled DFB laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA), and an MCU control unit. All modules satisfy class I laser safety requirements. The transceivers are compatible with the SFP Multi-Source Agreement and SFF-8472 digital diagnostics functions.