Summary:

The ML4066-QDD is a QSFP-DD to QSFP-DD Adapter with diagnostic interface for the power, I2C and management interface control and alarm signals. The SFF analyzer board is connected to the ML4066 to enable live diagnosis for the transceiver and host.
All high-speed channels are routed from the plug connector to a QSFP-DD host connector at the front, where a QSFP-DD transceiver can be plugged in order to analyze and diagnose the transceiver and Host during live operation.