The data file format:
1.
MJD: Modified Julian Date - is the continuous count of days since the beginning of the Julian Period
(started at 1858 Nov 17 - 0:00)
2.
time past midnight in seconds
3.
time stamp (ISO from MJD and time past midnight)
4.
measured clock offset raw (If the request interval is less than the Logging interval then the mean
value of the measured offsets at request interval will be stored)
5.
in case of NTP: clock offset median (Median of the 5 last measured offsets at request-int
in case of PTP: reported offset
6.
path delay in seconds
7.
NTP stratum or PTP state
8.
’R’ (optional indicator for min/max values of raw data: if the request interval is less than the log-
interval then automatically the Min and Max values of the raw data will be stored in the next 2 lines
9.
see 8. (optional)
10.
see 8. (optional)
11.
’M’ (optional indicator for min/max values of MTie (Maximum Time interval error) values from PTP
nodes which supports this option: if the PTP node support MTie feature with extended TLVs then the
Min and Max values will be stored in the next 2 lines.
12.
see 11. (optional)
13.
see 11. (optional)
Samples of Monitoring Data stored in the history of days files:
Example for NTP data files:
# Day Sec Modified_Julian_day_time Raw_offset Median_offs Path_delay Stratum
58043 21705 2017-10-17T06:01:45+00:00 -0.000000129 -0.000000053 0.000007667 1
Example for NTP data files with request interval less than log interval:
# Day Sec Modified_Julian_day_time Raw_offset Median_offs Path_delay St Min Max
58043 21705 2017-10-17T06:01:45+00:00 -0.00000129 -0.000000053 0.000007667 1 R -0.01 0.01
Example for PTP data files:
# Day Sec Modified_Julian_day_time Raw_offset Report_offs Path_delay Portstate
58043 21705 2017-10-17T06:01:45+00:00 -0.000000129 -0.000000053 0.000007667 9
Example for PTP data files supporting Mtie feature:
# Day Sec Modified_Julian_day_time Raw_offset Median_offs Path_delay St Min Max
58043 21705 2017-10-17T06:01:45+00:00 -0.00000129 -0.000000053 0.000007667 9 M -0.01 0.01
144
Date: 2nd July 2020
LANTIME CPU Expansion Shelf
