Manchester code, also known as phase encoding, or PE (we prefer Manchester Encoding). Is encoding of each data bit is either low then high, or high then low, for equal time. It is a self-clocking signal with no DC component. It enables power transfer between two circuits that must not be connected.
Manchester encoding showing both conventions for representation of data
This galvanic isolation separates the input and output supplies to a device so that energy flows through a field rather than via electrical connections page 
We ponder Microsoft's new direct storage to see if Manchester Code is used to encode between NVMe SSD to the graphics card, thereby skipping the CPU and leveraging PCIe 3.0 or PCIe 4.0 speeds page