This read-write DisplayString (0..128 characters) provides the expected J0 section trace value that the OCn/STM interface should receive from the far end, per its description. An administrator configures it so the local equipment can automatically detect a trail trace identifier mismatch (TIM), which typically indicates a misconnected fiber or a cross-connected circuit. For example, configuring this to the far-end's known J0 string lets the system raise an alarm automatically if the fiber is accidentally patched to the wrong remote interface.