Update Leap Seconds File - Safran WR-ZEN Series User Manual

3.8010.0
3.8020.x
3.8020.1
5.8.1

Update Leap Seconds File

Besides using 10MHz & PPS signals from the front- panel, the GM time source
needs to obtain the Time of Day (ToD) from an external reference. NTP is com-
monly used because of its easy configuration. However, the leap seconds must
be properly handled. Indeed, NTP is based on UTC timescale whereas PTP is
based on TAI and thus the non-fixed offset between UTC-TAI is provided by the
leap second file which varies according to earth rotation.
This file (also known as Bulletin C) is published by the International Earth Rota-
tion and Reference Systems Service (IERS) every six months to tell if a leap
second jump is scheduled for the end of next June or December, or not. This also
means that the file shipped within the release has an expiration date and does not
guarantee a valid UTC-TAI conversion after this date.
In order to always ensure a correct UTC-TAI correction, the device that can act as
Grand-Master on the network, can also manually update this file through the Con-
figuration > Misc panel:
Figure 5-19:
CHAPTER •
5 WR-ZEN Series User Manual Rev. v5.1
OID Name
PPS Mode
misc/info/xxx
Uptime
Manual Leap seconds update.
Value Type
• Always ON Configurable mode to control the PPS
• Only Locked output where:
• Legacy - PPS is always output even if CRITICAL
(Always ON).
- PPS is only output if the active ref-
erence is locked.
- PPS follows the same behavior as in the
legacy release (wr-zynq-os-v2.x).
Miscellaneous Timing information.
<Integer> Time Manager uptime in seconds.
(u64)
5.8 Miscellaneous
Description
109