Specifies the monitor point for the ODUk TCM non-intrusive monitoring function. The value source(2) is not allowed if the corresponding instance of jnxoptIfODUkDirectionality has the value sink(1), and the value sink(1) is not allowed if the corresponding instance of jnxoptIfODUkDirectionality has the value source(2). Either the value sink(1) or source(2) is allowed if the corresponding instance of jnxoptIfODUkDirectionality has the value bidirectional(3). The value sink(1) means monitoring at the sink direction TCM signal of the ODUk CTP. The value source(2) means monitoring at the source direction path signal of the ODUk CTP.