Model: DDU-24/26
Doc. Ref. no. : - m06bom101
Issue no. 09
Page 46 of 51
User’s Manual
8.4 NTP Packet format:
Figure 25
NTP packet header format
Following is the description of each parameter in NTP Packet:
Leap
2-bit integer warning of an impending leap second to be inserted or
Deleted in the last minute of the current month, coded as follows:
0
no warning
1
last minute of the day has 61 seconds
2
last minute of the day has 59 seconds
3
alarm condition (the clock has never been synchronized)
Version
. 3-bit integer representing the NTP version number.
Mode
3-bit integer representing the mode, with values defined as follows:
4
server
Peer clock stratum
8-bit integer representing the stratum, with values defined as follows:
0
unspecified or invalid
1
primary server (e.g., equipped with a GPS receiver)
2
-255 secondary servers (via NTP)
Polling interval
can be set between 16 to 60; it is representing the maximum interval between
successive Queries.
Clock precision
8-bit signed integer representing the precision of the system clock. GPS is having clock
precision of 1 us (I microseconds = 0.000001s)
Root Delay
Total roundtrip delay to the reference clock, in NTP short format.
Root Dispersion
Total dispersion to the reference clock, in NTP short format.
Reference clock ID
32-bit code identifying the particular server or reference clock.GPS Global
Positioning System
Reference clock update time
when the system clock was last set or corrected, in NTP timestamp
format.
Originate timestamp
Time at the client when the request departed for the server, in NTP timestamp
format.
Receive timestamp
Time at the server when the request arrived from the client, in NTP timestamp
format.
Transmit timestamp
Time at the server when the response left for the client, in NTP timestamp format.
