Spectracom VelaSync 1232 User Manual page 208

4.7 Quality Management
No longer in
valid), but have since been restored OR the Input references were not restored
before the Holdover period expired (Time Sync alarm is asserted).
In
Not In
currently 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 was too large. Or, the frequency couldn't be measured because a valid input
reference was not available.
Reference
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
Reference Priority Setup table) is now selected for synchronization OR a valid ref-
erence with higher priority than the previous reference is now selected for syn-
chronization.
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
(for example, IRIG was the selected input being used, but now GNSS is the selec-
ted reference).
GPS Antenna
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 track-
ing process regardless of the antenna status. The current draw measurements
that will indicate an antenna problem are:
196
Holdover: Input references were lost at one point (or declared not
Sync: VelaSync is synchronized to its selected Time and 1PPS reference inputs.
Sync: VelaSync is not synchronized to its Time and 1PPS inputs and is not
Error: The oscillator's frequency was measured and the frequency
change: VelaSync has selected a different Time and 1PPS input ref-
Change: VelaSync has switched from one input reference to another
Problem: The GPS Antenna Problem alarm indicates the GNSS
CHAPTER 4 • VelaSync User's Manual Rev. 3