An example Win32 host Ntp Platform Service Editor is shown in Figure 125. This is the default view for the RFC-1305 compliant NtpPlatformService on a Windows-based (Win32 or Win64) host.
This dialog provides access to some of the key settings of the Windows Time service (W32Time) on the host platform.
Settings are only a small subset of those possible to configure—for more fine-grained tuning of the time service, Windows
registry settings can be set according to Microsoft’s latest instructions. Visit the Microsoft tech support site for more
information on a particular Windows OS, for example using this search:http://search.microsoft.com/en-us/SupportResults.aspx?q=ntp+time+service
As in all Ntp Platform Service Editors, there are two main areas: Settings at top, Time Servers at bottom.
Settings in the Ntp Platform Service Editor Win32 include the following properties:
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Enabled
If true, the host will use NTP to sync its clock with time values retrieved from other servers.
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Sync Policy
Specifies how the host should sync, where possible choices include:
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none — available only if Enabled = false. Clock is not sync’ed with any time servers.
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ntp — available only if Enabled = true. Use NTP to sync with servers in the Time Servers list.
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domain — available only if Enabled = true and the host is a member of a Windows domain. Use NTP to sync with domain controllers, but not with servers in Time Servers list.
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both — available only if Enabled = true and the host is a member of a Windows domain. Use NTP to sync with domain controllers, and also with servers in Time Servers list.
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Max. Pos. Phase Correction
Maximum amount of time, in seconds, that the clock can be set forward in a sync. Default is 54000, or 15 hours. If the service determines a larger correction is needed, an event log is created instead.
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Max. Neg. Phase Correction
Maximum amount of time, in seconds, that the clock can be set backward in a sync. Default is 54000, or 15 hours. If the service determines a larger correction is needed, an event log is created instead.
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Min. Poll Interval
The shortest period allowed between polls, where units are in “log-base-two seconds,” or 2 to the power of
nseconds (NTP convention). For example, if this value is 10, then the interval is 2 to the 10th seconds, or 1024 seconds. -
Max. Poll Interval
The longest period allowed between polls, where units are in “log-base-two seconds,” or 2 to the power of
nseconds (NTP convention). For example, if this value is 14, then the interval is 2 to the 14th seconds, or 16384 seconds. -
Special Poll Interval
Poll interval, in seconds, for servers in the Time Servers list that have “Use Spec. Interval” set to true.
Each entry in the time servers list in the Ntp Platform Service Editor Win32 specifies a server to which the host’s clock will be sync’ed when the Sync Policy is either “ntp” or “both.” These servers are not used if the Sync Policy is “none” or “domain.”
Controls below the list allow you to add 
and delete 
servers, as well as reorder up 
or down 
. Fields for each time server includes the following:
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Address
Fully qualified domain name, IP address, or host files alias for the NTP time server.
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Use Spec. Interval
Default is false. If true, the poll interval rules specified by RFC 1305 are ignored, and the specified Special Poll Interval is used instead.
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Fallback Only
Default is false. If true, this server is polled only if other servers cannot be reached.
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Peer Mode
Specifies the server’s sync relationship:
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unspecified — Use the system default behavior when sync’ing with the server.
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symmetricActive — Both this host’s and the server’s clocks may be changed as a result of each sync.
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client— Only this host’s clock may be changes as a result of each sync.
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