Model: MC-1-DE
Doc Ref. No:-m05dom102
Issue No:-00
Page 57 of 76
User’s Manual
tum value increases, the accuracy of NTP client decreases depending on the type of NTP server’s
clock accuracy in hierarchy, processing capabilities of multiple NTP requests and transmission delays.
•
If the stratum level of GPS TIME SYNC UNIT MC-1-DE device
is configured at 15 under Unlock conditions, no NTP client will syn-
chronize its time with NTP server output as level 15 is the last limit
of stratum as per NTP standard.
•
Stratum of GPS TIME SYNC UNIT MC-1-DE under Unlock
conditions should be such that last NTP client in hierarchical ar-
rangement should be at stratum level 15 so that can be continuous-
ly synchronized with its superior level NTP source device.
•
I.P. address of two NTP ports in GPS should not be same if
both NTP ports are to be used in same network domain.
•
It is recommended that NTP output in network should be used
only when once GPS TIME SYNC UNIT MC-1-DE is Lock after be-
ing power UP. If GPS TIME SYNC UNIT MC-1-DE device was in
Power OFF condition for very long duration, RTC battery may get
discharged and RTC time will reset to its default time. (Please
check the applicable battery backup period mentioned in RTC sec-
tion).
NOTE:
•
Factory set IP of NTP ports are 192.168.100.153 (NTP1) &192.168.100.154(if NTP2 is available
as optional output).
•
I.P. address of two NTP ports in GPS should not be same if both NTP ports are to be used in
same network domain.
•
Among all applicable NTP parameters in NTP packet format, only stratum value can be modified
for GPS TIME SYNC UNIT MC-1-DE Unlock condition only. If GPS TIME SYNC UNIT MC-1-DE NTP
output stratum value is configured as 15, all NTP clients in network will continue to ignore GPS TIME
SYNC UNIT MC-1-DE NTP output as valid time source.
•
As NTP protocol is based on UDP transmission protocol (as UDP is a connectionless protocol as
there is no acknowledgment for failed packet delivery), NTP requests from NTP clients to NTP serv-
ers and NTP responses from NTP servers to NTP clients can be delayed at irregular intervals or rare-
ly discarded if there too much Ethernet packets load/congestion in network.
•
There may be rare case that NTP Server responses to some NTP requests from NTP clients may
be discarded, if there is large number of simultaneous NTP requests to single NTP server port.
•
It is recommended that NTP output in network should be used only when once GPS TIME SYNC
UNIT MC-1-DE is Lock after being power up. If GPS TIME SYNC UNIT MC-1-DE device was in Pow-
er OFF condition for very long duration, RTC battery may get discharged and RTC time will reset to
its default time. (Please check the applicable battery backup period mentioned in RTC section).
•
If GPS TIME SYNC UNIT MC-1-DE was Lock for once after being Power UP, GPS TIME SYNC
UNIT MC-1-DE will retain accurate NTP output in holdover conditions (according to its local clock
ppm accuracy).
