Current DAC Setting: Current DAC value, as determined by the oscillator disciplining sys-
tem. The value is converted into a voltage that is used to discipline the oscillator. A stable
value over time is desirable and suggests steady oscillator performance (see also the
graph in the History Panel).
DAC Step: Step size for adjustments to the internal oscillator, as determined by the oscil-
lator disciplining system. Larger steps = quicker, but coarser adjustments. The step size is
mainly determined by the type of oscillator.
TFOM: The Time Figure of Merit is SecureSync’s estimation of how accurately the unit is
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
SecureSync 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: Value, as set under "Configuring the Oscillator" on page215
Temperature(s): 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 History panel
on the right, while graphs for board and CPU temperature can be
found under TOOLS > SYSTEM: System Monitor.
Note that older SecureSync units may not be equipped with temperature sensors yet.
(Can be retrofitted, please contact Spectracom.)
For more information, see "Temperature Management" on page297.
Last Time Reference Change: [Timestamp: Last occurrence]
Last 1PPS Reference Change: [Timestamp: Last occurrence]
Last TFOM Change: [Timestamp: Last occurrence]
Last Sync State Change: [Timestamp: Last occurrence]
Last Holdover State Change: [Timestamp: Last occurrence]
The Oscillator History Panel
The Oscillator History Panel offers real-time graphical monitoring of SecureSync’s internal tim-
ing. The following graphs plot key oscillator-relevant data over time::
4.5 Quality Management
CHAPTER 4 • SecureSync User Reference Guide Rev. 26
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