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2-33
2.2.4.4
Setting the date
and time
2) equal to or greater than 0.5 second and less than 600 seconds, the time is not
Addition
adjusted;
3) equal to or greater than 600 seconds and less than 1000 seconds, a step
adjustment is made; (in this case, reversal is possible) or
4) equal to or greater than 1000 seconds, the NTP function stops.
(b) PQ520:
PQ580/540:
PQ510A:
PQ520A/520X:
PQ580A/540A:
If the time difference between the MMB and the NTP server being synchronized
with is:
1) less than 600 seconds, a slew adjustment is made (corrected maximally for
0.0005 second per second without reversal);
2) equal to or greater than 600 seconds and less than 1000 seconds, a step
adjustment is made; (in this case, reversal is possible) or
3) equal to or greater than 1000 seconds, the NTP function stops.
4. Time polling interval
The time is synchronized at an interval of 64 to 1024 seconds. The initial
synchronization interval is 64 seconds. As the synchronization precision stabilizes, the
interval increases in stages: 64 seconds 128 seconds 256 seconds 512 seconds
1024 seconds.
(The algorithm for the increase in the synchronization interval complies with RFC 1305.
For details, see Sections 3.4.2 through 3.4.9 of RFC 1305.)
5. NTP server stratum of the MMB
The NTP server stratum of the MMB is stratum+1 of the external NTP server with which
is it synchronized. If it is not synchronized with an external NTP server, this stratum is
5.
6. Accommodating leap seconds
NTP of the MMB does not have a function for inserting leap seconds. Therefore, to
have the MMB time support leap seconds, synchronize the MMB with an external NTP
server that supports leap seconds.
If the NTP client of the MMB is in Step mode and the time difference is equal to or
greater than 0.128 second, the MMB time may undergo a step adjustment. This is
possible even if the external NTP server gradually shifts the time to adjust for leap
seconds. To prevent step adjustments during adjustments for leap seconds, use Slew
mode.
Description
3.26 and later
3.26 and later
4.18 and later
4.18 and later
4.18 and later
3
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