The PHY3070 is a complete VCSEL driver transmitter and limiting amplifier receiver combined with digital diagnostic support and extensive digital control of all setup parameters. A fully compliant 10GBASE-SR SFP+ module with SFF-8472 DDM can be designed when used with an external microcontroller and suitable optics. A Loss of Signal (LOS) detector is included with detection based on either the receiver photo detector average current or received signal modulation amplitude. For digital diagnostics applications sensors measure TX bias, supply voltage, RX signal strength, mean power and temperature. An integrated A/D converter allows these measurements to be reported via the serial interface. An external Microcontroller Unit (MCU) is used for calibrating real time diagnostic monitors and alarm generation.