098-00720-000 Revision D1 – February, 2018 SyncServer 600 Series User’s Guide 185
Chapter 6 Provisioning
Provisioning Input References
Provisioning Input References
When operating in normal (locked) mode, the SyncServer S6x0 uses an external
reference, such as GNSS, to acquire the frequency and/or TOD alignment.
Selection among multiple references inputs is based on priority.
The SyncServer 6x0 does not contain a battery-backed real time clock. Therefore, it
will always boot up with a default value for the system time. This time will be
updated when it obtains time from a time reference such as GNSS, IRIG, or NTP.
The default value for the date is the software build date. This date will be used for
the first log entries when booting up the unit. The time will change to local time
during the boot-up process if a time zone has been configured.
The system will monitor all inputs and determine if there is a valid signal on each
input. The system only uses one reference at a time. The highest priority valid input
will be used. This is specified in the Timing - Input Control Window. Each reference
has a different priority - the slot A and slot B references will have different priorities.
With release 2.1, the priorities can be changed. All releases allow individual input
references to be enabled/disabled. A frequency reference is only used if there are
no valid timing references.
Setting GNSS Parameters
When the GNSS reference is enabled, you can set the satellite position parameters
either automatically with Survey mode, or manually with Position Hold mode. The
GNSS reference input is enabled by default.
In Position Hold mode, you must specify the latitude, longitude, and height. Position
Hold mode should not be used unless antenna location has been accurately
surveyed.
You can specify the elevation mask which provides a method to filter out satellites
used in the timing solution based on elevation (0 = horizon, 90 = direct overhead).
The mask selection eliminates satellites smaller than the selected mask value.
You can also specify the cable delay.The effect of the entered value is to move the
positioning of the rollover of the second (e.g. PPS) earlier by the value entered,
thereby accounting for the delay associated with antenna and cable. See Table C-1
for cable-delay values for Microsemi GNSS antenna kits and accessories.
Note: It is important the cable delay be configured with the proper
value. This can be determined from the cable length and the delay of
the antenna.
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