Message format in the network time protocol (NTP), which form more understanding, the mainest is
T0 management side as "clock request monitor" time scale;
T1 for monitoring end receive "clock request monitor" time scale;
T2 to be monitored side returns the time scale of "clock the result of the request monitor";
T3 for management side received the time scale of "clock the result of the request monitor",
The four time, in the process of test I found that has been 0 T0, I doubt is wrong, has experienced, unriddling for me,