The Physical Layer Chip (IMAGE) NASA/Goddard Space Flight Center Caption The "Phy" or physical layer chip connects the SpaceWire protocol chip to the SpaceWire connector and cabling. Credit NASA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.