{HEAD ~ A device insertion signal} is transmitted to {TAIL ~ the controller} in response to another power management event and while the device remains installed within the socket 
{ HEAD ~ A device insertion signal } is transmitted to { TAIL ~ the controller } in response to another power management event and while the device remains installed within the socket
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH