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Chapter 5 Timing and 1 PPS Analysis Results
Oscillator Results
T-BERD/MTS 5800 Timing Expansion Module User Manual
Page 58 22112315, Rev. 004 July 2017
Oscillator Results
The Oscillator Status category provides results concerning the status of the TEM
Module’s oscillator and details concerning holdover mode.
Table 12 describes the
Status results.
GPS Time Valid Indicates whether the GPS time is valid per the timing
information received by the GPS receiver.
Leap Seconds Displays the leap seconds.
Local Time Displays the local time which is derived from the time
zone with respect to GNSS time.
PTP Time Displays the PTP time. Also (also referred to as “TAI,”
Temps Atomique International).
UTC Time Displays the UTC time as defined by ITU-R TF.460-6.
UTC time is based on International Atomic Time (TAI) with
leap seconds added at irregular intervals to compensate
for the slowing of Earth's rotation.
UTC Time Accuracy Est
(ns) Displays the estimated accuracy of the UTC time in nano-
seconds. In order to provide an estimate of UTC time
(derivable from a GNSS signal), a set of UTC corrections
is broadcast by the satellite.
UTC Time Valid Indicates whether the UTC time is valid per the timing
information received by the GNSS receiver.
Table 11 Time results (Continued)
Result Definition
Table 12 Oscillator Status results
Result Definition
Holdover Duration The duration of time that the oscillator has currently
been operating in holdover mode (in hours, min-
utes, and seconds).
Holdover Time Remaining An estimate of the time remaining in holdover mode
(in hours, minutes, and seconds) before the oscilla-
tor drifts
beyond the level specified as acceptable
when you configured the oscillator settings.
Max Holdover Duration The maximum duration of time that the oscillator
has remained in holdover mode (in hours, minutes,
and seconds) since initially being forced into hold-
over mode.
A detailed log concerning the oscillator’s status as it
tunes to a synchronization source and functions in
and out of holdover mode is available in the Event
Log.