Method and device for realizing precise time synchronization
A time stamp and sending time technology, applied in the field of network communication, can solve the problems of 1588 time synchronization accuracy reduction and the same delay between uplink and downlink
Active Publication Date: 2012-08-15
NEW H3C TECH CO LTD
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However, in actual situations, especially when the uplink and downlink lines are asymmetrical, the uplink and downlink delays cannot be guaranteed to be the same, so the actual value of Offset is not Δsm, resulting in a significant decrease in 1588 time synchronization accuracy
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[0047] In order to solve the technical problems proposed by the present invention, the specific realization of the scheme of the present invention includes:
[0048] The optical module on the slave device side sends the downlink delay test message to the optical loopback device on the master device side through the downlink fiber. After recording the sending time, it receives the downlink time delay test message returned by the optical looper through the downlink fiber, and records the received After the time, calculate the downlink delay according to the recorded sending time and receiving time; the optical module on the slave device side sends the uplink delay test message to the optical loopback device on the master device side through the uplink optical fiber, and after recording the sending time, receive the optical loopback Return the uplink delay test message returned by the uplink optical fiber, and after recording the receiving time, calculate the uplink delay accordin...
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The invention provides a method and device for realizing precise time synchronization. The method comprises the following steps of: transmitting a downlink time delay test message (or an uplink time delay test message) to an optical circulator of a main device through a downlink optical fiber (or an uplink optical fiber) through an optical module of a secondary device, recording transmission time, receiving the downlink time delay test message (or the uplink time delay test message) returned by the optical circulator through the downlink optical fiber (or the uplink optical fiber), recording receiving time, and computing downlink time delay (or uplink time delay) according to the recorded transmission time and the receiving time; and computing to obtain time error between the main device and the secondary device through an IEEE1588 protocol, the uplink time delay and the downlink time delay, and enabling the secondary device to realize the precise time synchronization with the main device according to the time error obtained through computation. Through utilizing the method and device for realizing the precise time synchronization, disclosed by the invention, the influence on time synchronization due to dissymmetric uplink and downlink can be avoided, and the precision of the time synchronization is improved.
Description
technical field [0001] The invention relates to the technical field of network communication, in particular to a method and device for realizing precise time synchronization. Background technique [0002] The IEEE1588 protocol is currently the only protocol that can achieve high-precision time synchronization, such as figure 1 As shown, the slave device transmits messages with the master device through the uplink and downlink to obtain four time points T1, T2, T3 and T4 for time synchronization, thereby realizing time synchronization. For the specific message transmission process, please refer to figure 2 ,Such as figure 2 As indicated, the process may include: [0003] The master device sends a Sync message to the slave device through the downlink, and at the same time, sends a Followup message with the sending time T1 of the Sync message to the slave device through the downlink; [0004] After receiving the Sync message, the slave device records the arrival time T2 o...
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IPC IPC(8): H04J3/06
CPCH04B10/077H04J3/0667
Inventor 梁学伟
Owner NEW H3C TECH CO LTD