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Clock synchronization method, system and optical transmission equipment

A clock synchronization and equipment technology, applied in the field of communication, can solve the problems of inability to achieve clock synchronization, large time synchronization jitter, etc.

Active Publication Date: 2018-11-23
SHENZHEN ZHONGXING SOFTWARE CO LTD
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  • Abstract
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Problems solved by technology

[0003] The present invention provides a clock synchronization method, system and optical transmission equipment to solve the following problems in the prior art: when transmitting time information, because the lengths of optical fibers of several lines corresponding to the FlexE interface are different, the link delay will be Constantly changing, the greater the difference in fiber length, the greater the jitter of time synchronization, and it is impossible to achieve accurate clock synchronization

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  • Clock synchronization method, system and optical transmission equipment
  • Clock synchronization method, system and optical transmission equipment
  • Clock synchronization method, system and optical transmission equipment

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Embodiment 1

[0084] The realization block diagram of this embodiment is as attached Figure 5 shown.

[0085]The device in the sending direction: first obtain the sending time stamp according to the local time and the sending position of the overhead corresponding to the time information packet header, and encapsulate the sending time stamp into the time information message. Afterwards, the time information message is inserted into the reserved field (ie reserved field) of the FlexE overhead frame in blocks, together with other information to generate an overhead frame, and then the overhead frame is inserted into the data stream of PHY0. It is also possible to insert the time information message into the overhead frames of other PHYs.

[0086] Device in the receiving direction: first extract the overhead from the data stream of PHY0, and record the timestamp of the overhead position, reassemble the overhead frame according to the extracted overhead, extract the time information message f...

Embodiment 2

[0093] This implementation mode introduces a scheme in which different processing units are respectively implemented in two components. Among them, component 1 implements functions such as insertion and extraction of overhead frames, reassembly of overhead frames, and recording of sending and receiving time stamps. Component 2 implements functions such as time information message generation, overhead frame generation, time stamp extraction, time synchronization and frequency synchronization. The internal messages of component 1 and component 2 are transmitted through the GE port, and the block diagrams of the sending direction and receiving direction are shown in the attached Figure 8 And attached Figure 9 shown.

[0094] The time information can be transmitted in the overhead reserved field of a line of FlexE. In this embodiment, the 0th line is selected, and the time information is added to the overhead reserved field of PHY0.

[0095] In the sending direction, componen...

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Abstract

The invention discloses a clock synchronization method and device. The method comprises the following steps: first equipment sends local clock information to second equipment through the overhead of FlexE, thereby enabling the second equipment to perform clock synchronization according to the local clock information of the first equipment. The first equipment sends the local clock information to the second equipment through the overhead of the FlexE, thereby enabling the second equipment to perform clock synchronization according to the local clock information of the first equipment, and the transmission of the time information message is accomplished through the overhead frame sending, the transmission process is free from the influence of different optical fiber lengths, and the clock synchronization can be accurately realized, and the following problems in the prior art are solved: the link delay can change continuously since the optical fiber lengths of several lines correspondingto the flexE interface are different in the time information transmission, the larger the optical fiber difference is, the larger the jiggering of the clock synchronization is, and the clock synchronization cannot be realized.

Description

technical field [0001] The invention relates to the communication field, in particular to a clock synchronization method, system and optical transmission equipment. Background technique [0002] Because of its flexibility, the FlexE interface is more and more widely used, for example, it is widely used in the fronthaul network. But at the same time, because of its flexibility, the time information generated by the client side cannot be fixedly transmitted on one line. If the fiber lengths of several lines of FlexE are different, the link delay will continue to change, and the time synchronization will also be affected. If there is jitter, the greater the difference in fiber length, the greater the jitter of time synchronization, and precise time synchronization cannot be achieved. Contents of the invention [0003] The present invention provides a clock synchronization method, system and optical transmission equipment to solve the following problems in the prior art: when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04J14/02
CPCH04J3/0661H04J14/0227
Inventor 李霞刘峰何力罗彬游俊
Owner SHENZHEN ZHONGXING SOFTWARE CO LTD
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