098-00720-000 Revision D1 – February, 2018 SyncServer 600 Series User’s Guide 195
Chapter 6 Provisioning
Provisioning Inputs with Manual Entry Controls
General Behavior Associated with Manual Entry
The following behaviors apply to all of the manual entries:
If there is currently a qualified time reference that is capable of providing that
particular information, then a manual entry supplying that information will NOT be
used. In other words, the information from a qualified time reference is given
preference over the manual information. A list of currently qualified time
references can be seen on the Dashboard > Timing > Timing References row.
Any references in this row that are green are qualified. These represent the pool
from which that information may be provided.
Similarly to the prior point, if a manual entry is being used (this happens when
there is no qualified input that can provide that information) and an input
becomes qualified that can provide it, then the manual value will be discarded in
favor of what the input is supplying. This point may help orient the foundational
purpose for these controls: they are not provided to correct errors from inputs
(rare), they are provided to enable a method for these values to become known
when there is no current input that can supply them.
All manual entries are acted upon immediately or not at all. In other words, at the
time the value is entered, if the situation at that moment is one that will actually
allow use of the value (i.e. there is no qualified time input that is already providing
it), then the value will be used (be applied on time outputs as needed).
The S6xx features the capability to remember the last status that was in use for
each of these manual controls. This way, there is a good chance the values will
still be correct if power is cycled in a situation where some of these values are not
being actively updated by a qualified time reference. This would be the case if
only an IRIG (or NTP) was providing time input. On this point, it is important to
realize that:
– Even if using a manually entered year, the year will increment correctly at
the end of the year. This means that on power-cycle the year that will be
used won’t necessarily be the value that was entered but will also
incorporate any year increments that had taken place while operational.
– If using a manually entered pending leap, if the time when the leap is
scheduled to occur has not yet occurred when power is cycled, upon
power-up the S6xx will remember that a leap had been pending. However,
upon discovery of the current time if it turns out that the time for the leap
has passed, then the pending leap will be turned off. Of course, if on
subsequent power-up a time reference is provided that can supply leap
pending status, then the condition will entirely be based upon that status.
– If using a manually entered UTC offset, this value will be updated in the
appropriate direction if a leap event occurs (i.e. the time of a pending leap
happens). In this way, the UTC offset can increment even when it was
originally entered manually and is not being directly updated by any
external time reference.
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