The desired state of SONET Path Trace.
(1) enabled - Enables the generation of SONET Path Trace Messages
in the J1 bytes of the STS Path overhead, and enables the reception and
checking of received Path Trace Messages with the Expected Path Trace
Message.
(2) disabled - Transmits all zero's in the J1 bytes of the STS Path
overhead, and disables the reception and checking of received
Path Trace Messages with the Expected Path Trace Message.