From the master clock synchronization method and system

The present invention discloses a master-slave synchronization method and system clock from the master clock synchronization method comprising: receiving from the clock synchronization message and records the reception time T2; obtaining time T1-t1 + t4 from the sync clock to follow the packet, t1 is the arrival time of the first synchronization message protocol conversion means is connected to the master clock, t4 is the time synchronization message to leave from the second protocol converter means connected to the clock; the clock transmission delay request message and records the transmission time T3 ; Get a clock timing from the delay in the response packet received from the T4 + t1'-t4 ', t1' is the time delay request message reaches the second protocol converter means, t4 'is the delay request message conversion means away from the first protocol time; clock 'calculating deviations from the master clock from the time according T2, T3, T1-t1 + t4 and T4 + t1'-t4. Improve the calculation accuracy from the master clock time offset.