Microsemi SyncServer S200 User Manual page 43

Any available source for a SyncServer can be enabled or disabled via a checkbox associated
with the source.
Note 1: At least one clock reference must be enabled.
Note 2: See SyncServer feature comparison (see
parison" on page 18) to see which sources are available for each model of SyncServer.
If the reference becomes unavailable, the HW Clock uses the next highest available ref-
erence in the list.
If no other references are available, the HW Clock provides holdover by "flywheeling" on its
oscillator until a reference becomes available again. During this time, "REF" on the front
panel TIME screen (press the TIME button) is "None", while the "NTP Stratum" remains "1".
"REF" on the front panel NTP Status screen (press the STATUS button) changes to "FLY".
If no references become available, the NTP daemon gets its time from other available NTP
references. At this time, "REF" on the TIME screen becomes "NTP" and "NTP Stratum"
degrades from "1" to the stratum of the NTP reference plus one. For example, with an NTP
Stratum 1 reference as its primary reference, the SyncServer's "NTP Stratum" becomes
"2". "REF" on the STATUS screen changes to the IP address of the synchronizing peer.
If references that set the time (GPS, IRIG, and NTP references) are not available, but a tim-
ing reference (1 PPS, 10 MHz) is, the user can set the time manually. See the "Setting the
Time Manually" section below.
NOTE 3: When providing a backup reference source for the GPS or IRIG Input references,
Microsemi recommends using the 10 MHz Input. An unsynchronized 1 PPS Input may cause
the NTP daemon to disqualify the HW Clock and rely on a lower-stratum NTP reference
instead, if one is available.
Oscillator Type: The type of oscillator in use. Three different oscillator types are offered in the
SyncServer.
TCXO – This is the standard temperature compensated oscillator.
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OCXO – This optional oven oscillator is more stable and offers better holdover per-
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formance than the TCXO.
Rubidium – This optional oscillator is more stable and has better holdover performance
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than the OCXO.
Forced Timing Source: Forces the Hardware Clock to synchronize to a specific timing source.
Auto: The SyncServer automatically detects and synchronizes the Hardware Clock to the
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timing reference(s) in the following order: GPS, IRIG-B, 1 PPS, 10 MHz. This is the fact-
ory default setting.
Free Run: Forces the Hardware Clock to ignore all references. This puts the SyncServer
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oscillator into free running mode. If needed, the user can manually set the SyncServer's
UTC time while using this mode. The SyncServer takes submission of this page using the
APPLY button as the on-time mark.
UTC Time: Enter the UTC time here to set the Hardware Clock. Available when "Forced Tim-
ing Source" is set to Auto or Free Run.
997-01520-02 Rev. G2..........................................................................
"SyncServer Signal Feature Com-
TIMING Tab
Page 43