” ” – No state indicated for:
non-communicating remote machines,
“LOCAL” for this local host,
(unutilised) high stratum servers,
remote machines that are themselves using this host as their synchronisation reference;
“x” – Out of tolerance, do not use (discarded by intersection algorithm);
“-” – Out of tolerance, do not use (discarded by the cluster algorithm);
“#” – Good remote peer or server but not utilised (not among the first six peers sorted by synchronization distance, ready as a backup source);
“+” – Good and a preferred remote peer or server (included by the combine algorithm);
“*” – The remote peer or server presently used as the primary reference;
“o” – PPS peer (when the prefer peer is valid). The actual system synchronization is derived from a pulse-per-second (PPS) signal, either indirectly via the PPS reference clock driver or directly via kernel interface.