Spectracom VersaSync User Manual page 218

4.6 Quality Management
value over time is desirable and suggests steady oscillator performance (see also the
graph in the History Panel).
DAC Step
lator disciplining system. Larger steps = quicker, but coarser adjustments. The step size is
mainly determined by the type of oscillator.
TFOM
synchronized with its time and 1PPS reference inputs, based on several factors, known
as the Estimated Time Error or ETE. The larger the TFOM value, the less accurate Ver-
saSync believes it is aligned with its 1PPS input that is used to perform disciplining. If
this estimated error is too large, it could adversely affect the performance of oscillator
disciplining. The available TFOM range is 1 through 15.
Max TFOM for Sync
Temperature(s)
Last Time Reference Change
Last 1PPS Reference Change
Last TFOM Change
Last Sync State Change
Last Holdover State Change
The Oscillator History Panel
The Oscillator History Panel offers real-time graphical monitoring of VersaSync's internal timing.
The following graphs plot key oscillator-relevant data over time::
Phase Error Magnitude : See
Frequency Error : See
Scaled DAC Value : See
Oscillator Temperature , which has an effect on oscillator accuracy, and therefore can be
used to interpret oscillator performance.
206
: Step size for adjustments to the internal oscillator, as determined by the oscil-
: The Time Figure of Merit is VersaSync's estimation of how accurately the unit is
: Value, as set under "Configuring the Oscillator" on page 172
: Three temperatures are displayed:
Oscillator temperature, which has an effect on oscillator accuracy, and therefore
can be used to interpret oscillator performance.
Board temperature (measured on the main board, sometimes also referred to as
'System temperature')
CPU temperature
Note: Oscillator temperature is plotted over time in the
on the right, while graphs for board and CPU temperature can be
found under TOOLS > SYSTEM: System Monitor
: [Timestamp: Last occurrence]
: [Timestamp: Last occurrence]
: [Timestamp: Last occurrence]
: [Timestamp: Last occurrence]
: [Timestamp: Last occurrence]
1PPS Phase Error
10_MHz_Frequency_Error
DAC Step
.
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4 VersaSync User Manual Rev. 6.0
History panel