While
System Status
and logged
Events
are displayed on the left, the
Outputs
panel on
the right lists all the outputs detected.
If you hover with your mouse pointer over any of the connectors shown in the
rear panel illustration, a tooltip will be displayed, indicating the type of output..
If you have only one output of any type, NetClock will number that output 0. Addi
tional outputs will be numbered 1 or above.
If you click the INFO button next to an output, a Status window will open.
If you click the GEAR button next to an output, the Configuration window will
open.
2.17.2 The 1PPS and 10 MHz Outputs
Note:
NetClock 9489 only has a 1PPS output; therefore, information pertaining
to the 10 MHz output only applies to NetClock 9483.
The NetClock 9483 includes one 1PPS output and one 10 MHz output. To configure these out
puts, navigate to:
INTERFACES > OUTPUTS
and select the
1PPS Output
or
10 MHz Output
you would like to see, or configure.
NetClock’s 1PPS output is generated from the oscillator’s 10 MHz output and is aligned to the
on-time point. The on-time point of the 1PPS output can be configured to be either the rising or
falling edge of the 1PPS signal (by default, the rising edge is the on-time point).
There is a fixed phase relationship between the 1PPS and the 10 MHz outputs, as described
below:
NetClock equipped with
TCXO/OCXO/Low-Phase-Noise Rubidium oscillator
: With
oscillator disciplining active (one or more 1PPS references available and valid) and
after the on-time point has been initially slewed into alignment with the selected ref
erence, there will always be exactly 10 million counts of the oscillator between each
1PPS output, even while in the Holdover mode (= input references are currently unavail
able) and even after input references have become available again.
NetClock equipped with
Rubidium (Rb) oscillator
: With oscillator disciplining active
(one or more 1PPS references available and valid), after the on-time point has been
slewed into alignment with the selected reference, with the exception of 1PPS input ref
erence changes occurring, there will always be exactly 10 million oscillator counts
between each PPS output pulse.
With the Rubidium oscillator installed, when a 1PPS input reference change occurs (such
as switching from IRIG input to GNSS input, or switching from a reference being valid to
no reference being present or valid—known as the
Holdover
mode), the oscillator counts
between two 1PPS outputs may momentarily not be exactly 10 million counts. Once the
2.17 Configuring Outputs
CHAPTER
2
•
NetClock User Reference Guide
Rev.
16
139
Содержание NetClock 9400 Series
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