This attribute displays whether the Path Remote Defect Indicator
(P-RDI) signal is being transmitted over the path signal. The P-RDI
signal is transmitted over the outgoing line upon detection of LOP,
P-AIS or the occurrence of the LCD state. This attribute is always
set to off when the Path component has been locked and left offline
by the operator or when the Path component has been suspended
since the parent component has been locked.