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becomes the slave and is synchronized via optical link from master. At this point the
stratum of the slave is: master s1.
•
In case of loss of the slave GPS, the slave is synchronized via optical link from
master. Stratum is increased to: master s1.
•
In the case of a loss of the master (power down), the slave assumes the master
function.
•
If the former master is working again, it takes the current time from GPS, compares
with the current master and remains in slave mode. (Initially it will take the time from
redundant link; first source which is locked is used to set the time.)
•
In the case of a fibre optic connection loss and both devices are still GPS
synchronized, the master remains in master mode and the slave changes from slave
to master mode. But both devices release an alarm.
NTP
The NTP clients select the server with the better (lower) stratum.
PTP
Clients use BMCA (Best Master Clock algorithm)
RTC:
It is recommended to not use the RTC.
Notice:
If redundant mode is in use, either leave network settings of
port 4
on
default values or at least switch DHCP = ON, PTP = OFF and SyncE =
OFF.
8.15 Logfile Synchronization status
The DTS 4210 provides a logfile under /ram/
date-wd
.log (e.g. /ram/20180626-Tue.log)
about the synchronization status seven days back. The Log interval is 1 minute. The
maximum value of this 1 minute is written to the file.
Example:
Date&Time UTC Offset GNSS Offset PTP Offset NTP Offset DCF Offset Red. Offset E1
141118 000000 0 ( ) 104 (+) 0 ( ) 0 ( ) 96 (*) 0 ( )
141118 000001 0 ( ) 104 (+) 0 ( ) 0 ( ) 96 (*) 0 ( )
141118 000002 0 ( ) 104 (+) 0 ( ) 0 ( ) 96 (*) 0 ( )
(*) = active source
Please see chapter 7.6 how to make a ftp connection to the device.
