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User Guide
34
GNSS receiver Enables access to the GNSS configuration menu and shows
information about the GNSS receiver status, if this option is
available. These are
• No data: There is no connection between the test unit and
the GPS / Glonass receiver or the receiver is not generat-
ing any data.
• Acquiring fix: The GNSS receiver has not yet acquired
position and time. Achieving this data may take a few sec-
onds. The equipment may fail to achieve the fix if there are
not enough satellites in sight.
• Waiting for PPS: The GNSS receiver has acquired position
and time and it is reporting this information but it is not yet
generating the 1 PPS signal required for a correct assess-
ment of the position / time.
• Synchronizing to PPS: The GNSS receiver is now report-
ing position and time and generating a 1 PPS. The unit is
acquiring this information.
• Synchronized to GNSS: The test unit is tracking the GNSS
signal. The time scale reported by the GNSS constellation
is being used. For example the GPS time is 19 seconds
behind TAI.
• Synchronized to UTC: The test unit is tracking the GNSS
signal. UTC time scale is used. Once the GNSS status is
reported the unit cannot get the UTC time unless the TAI-
UTC second count is known. This data is also reported by
the satellite system and it takes some time before the
information is acquired.
The GNSS configuration menu is greyed out unless the
GNSS clock reference input is configured in Input clock.
PPS / ToD input
interfaces
Menu that configures and reports status of 1 PPS, 1 PP2S
and ToD clock references outputs. Configuration of these
interfaces is limited to a custom incoming cable delay com-
pensation. The displayed status information corresponds
with the ToD format (ITU-T G.8271, NMEA, China Telecom).
This menu entry is enabled only if Input clock is configured to
any of 1 PPS (REF IN), 1 PP2S (REF IN). ToD (REF IN/
OUT).
Table 2.8: Reference Clock Panel
Result Description
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