The value of aluPtpClockTimeRefPriority indicates the relative priority order of the clock to be used as a source of system time. The aluPtpClockTimeRefPriority cannot be set to a non-zero value unless that clock is capable of time recovery. A lower numerical value indicates a higher relative priority to be the source of system time except for the value '0'. When the aluPtpClockTimeRefPriority is '0' the clock in not a candidate to be a source of system time. This object is '0' when the aluPtpClockType is set to 'endToEndTransparent (3)'.