Orolia Spectracom VelaSync 1232, User Manual

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No longer in Holdover : Input references were lost at one point (or declared not
valid), but have since been restored OR the Input references were not restored
before the Holdover period expired (Time Sync alarm is asserted).
In Sync : VelaSync is synchronized to its selected Time and 1PPS reference inputs.
Not In Sync : VelaSync is not synchronized to its Time and 1PPS inputs and is not cur-
rently in Holdover. NTP will indicate to the network that it is Stratum 15 and so the
time server likely be ignored as a time reference.
Frequency Error : The oscillator’s frequency was measured and the frequency error
was too large. Or, the frequency couldn’t be measured because a valid input ref-
erence was not available.
Reference change : VelaSync has selected a different Time and 1PPS input ref-
erence for synchronization. Either the previously selected input reference was
declared not valid (or was lost), so a lower priority reference (as defined by the Refer-
ence Priority Setup table) is now selected for synchronization OR a valid reference
with higher priority than the previous reference is now selected for synchronization.
E X A M P L E :
GNSS is the highest priority reference with IRIG input being a lower priority. VelaSync is
synced to GNSS and so GNSS is the selected reference. The GNSS antenna is disconnected and
IRIG becomes the selected reference. The Reference change entry is added to this log.
Authentication Log
Displays log entries for authentication events (e.g., unsuccessful login attempts, an incor-
rectly entered password, etc.) that are made to VelaSync’s command line interfaces (such
as telnet, SSH, FTP, etc.).
Events Log
Displays log entries related to GNSS reception status changes, Sync/Holdover state
changes, SNMP traps being sent, etc. Examples include:
Reference Change : VelaSync has switched from one input reference to another
(for example, IRIG was the selected input being used, but now GNSS is the selected
reference).
GPS Antenna Problem : The GPS Antenna Problem alarm indicates the GNSS
receiver has detected an over-current or undercurrent condition (an open or short
exists in the GNSS antenna cable, or the GNSS antenna is not connected to
VelaSync). The receiver will attempt to continue the normal acquisition and tracking
process regardless of the antenna status. The current draw measurements that will
indicate an antenna problem are:
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CHAPTER
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VelaSync 1232 User Manual Rev. 4
4.7 Quality Management