If the indicator blinks once every 2s (0.5 Hz), the system is running
properly. If the indicator blinks twice every second (2 Hz), the board
is starting and has not completed registration.
L/A indicators are at the upper left and right corners of each upper
interface row. An L/A indicator at the upper right corner indicates the
status of an interface in an upper row, and an L/A indicator at the
upper left corner indicates the status of an interface in a lower row. If
an L/A indicator is steady green, a link is Up. If an L/A indicator
blinks orange, data is being transmitted or received. If an L/A
indicator is off, a link is Down.