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8
Time administration
8.1
Time acceptance
Variants of time synchronization
Adjusting:
After starting the DTS 4128, the time is set for a first time (from source or manually).
Afterwards, the time will only be aligned with maximum adjusting speed if deviating
from the source.
Configuration, see Chapter
“0 Time-keeping“
Setting:
Time deviations are always corrected in full immediately: Seconds are set
immediately; partial seconds are corrected with 50ms/s.
Manual time set:
The time is always set immediately. The stratum is set to 1 or pre-set to a fix
stratum. If new source time information is available, the time will be adjusted again
and the stratum set accordingly.
8.2
Time acceptance from an external source (DCF or GPS)
Acceptance from an external source (DCF input):
At least 2 minutes reception (DCF-GPS) is required, before the NTP server is
available.
Time source stratum = 0
stratum of the DTS 4128 = 1
Stratum normal, synchronized operation:
The stratum value behaves as follows for synchronization from the time source:
If St_fix > 0: then stratum = St_fix (particularly for manually set time) applies
If St_fix = 0: then stratum = stratum of the 1 applies
Stratum in case of error:
The stratum value behaves as follows in the case of external time source loss:
To:
Timeout time 1-999 [h], configured for the external source
St_fix:
0..15, configurable stratum, 0 = auto
St_max:
1..16, configurable max. stratum in the case of
synchronization loss
If St_fix > 0: then stratum = St_fix applies
If St_fix = 0:
then stratum = MIN((t_current - t_lastsynch)/(To * 255), St_max) applies
whereby: t_current [s]: current time
t_lastsynch [s]: time of the last synchronization
Adjusting the clock after identifying a leap in time:
Tst:
0..60'000 [ms], parameter time deviation for stratum alteration by 1
Tdiff:
current time difference in ms
If St_fix > 0:
then stratum = St_fix applies
If Tst > 0 AND St_fix = 0:
then stratum = MIN(Tdiff/Tst, St_max) applies
If Tst = 0 AND St_fix = 0:
then stratum = 1 (auto) applies
