LLID link test applying to the ONU only including delay
measurement option. The command tests a link to a single
LLID over a period of time or once, using a variable
number of measurement frames. The length of the measurement
frames is also parameterized. The test uses a loopback
mode of the ONU to return each measurement frame,
loopback activation is done using randomly patterned
OAM Protocol Data Unit(PDU) frames.