Advanced tab: Status information
Time Properties:
UTC Offset: The Master’s current offset between UTC time and TAI time. Units: seconds.
UTC Offset Valid: Indicates whether or not the Master’s UTC Offset is valid.
Leap Second: The Leap second correction as set on the Time Management page.
Time Traceable: Indicates whether the Master’s time is traceable (Enabled) to a primary
reference or not (Disabled).
Frequency Traceable: Indicates whether the Master’s Frequency is traceable (Enabled) to
a primary reference or not (Disabled).
PTP Time Scale: Indicates the timescale that the Master is using to broadcast its time. TAI
is the default PTP timescale.
Time source: The Time Source that the Master is using. Refer to IEEE Standard 1588-
2008, Section 7.6.2.6.
Clock Quality:
Clock Accuracy: A number describing the accuracy of the oscillator in the Master rel
ative to its UTC reference (see IEEE Standard 1588-2008, Section 7.6.2.5).
Offset Scaled Variance: A constant value based on the variance of the oscillator
installed in the NetClock unit.
Clock Class: A number describing the state of the time and 1pps references of the PTP
Clock.
See table below for Clock Class definitions (see also: IEEE Standard 1588-2008, Sec
tion 7.6.2.4, Table 5).
Table 5-11:
Clock class definitions
PTP
Time
Scale
Arbitrary
Time
Scale
Clock Class Definition
6 13 Time and 1pps references are synchronized with the host references and PTP clock shall
not be a slave to another clock in the domain.
7 14 Time and 1pps references are in holdover state, within specifications and PTP clock shall
not be a slave to another clock in the domain.
52 58 Time and 1pps references are in holdover state, not within specifications, and PTP clock
shall not be a slave to another clock in the domain. Then, applied to Master Clocks who
have just powered on and have not yet achieved a suitable TFOM value.
NetClock User Reference Guide 373
APPENDIX
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