Method for adjusting frequency based on IEEE1588 (institute of electrical and electronic engineers) protocol and network device

A technology for adjusting frequency and network devices, applied in the field of data communication, can solve problems such as system design complexity, achieve the effects of reducing design costs, reducing control links, and improving accuracy

Inactive Publication Date: 2011-09-28
ZTE CORP
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  • Application Information

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Problems solved by technology

However, these methods have many disadvantages, such as the hardware design must support the function of synchronous Ethernet, the hardware supporting the IEEE1588 protocol needs to be adjustable in closed-loop frequency, and at the same time affect the speed of hardware timestamping, etc., which will bring the complexity of system design, and hardware design cost

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  • Method for adjusting frequency based on IEEE1588 (institute of electrical and electronic engineers) protocol and network device
  • Method for adjusting frequency based on IEEE1588 (institute of electrical and electronic engineers) protocol and network device
  • Method for adjusting frequency based on IEEE1588 (institute of electrical and electronic engineers) protocol and network device

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Embodiment Construction

[0035] The difference between the slave clock device provided by the present invention and the slave clock device in the prior art is that the data controller outputs the control value to a frequency regulator, and the frequency regulator adjusts the frequency, and the adjusted frequency will not affect The stamping frequency of the timestamp module.

[0036] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0037] Such as figure 2 As shown, the network device as a slave clock device provided by the embodiment of the present invention includes the following modules:

[0038] Clock source module: used to provide frequency informa...

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Abstract

The invention provides a method for adjusting frequency based on an IEEE1588 (institute of electrical and electronic engineers) protocol and a network device. The method comprises the following steps: after a slave clock device receives messages of the IEEE1588 protocol sent by a master clock device, using first frequency information provided by a clock source module to mark timestamps on the messages of the IEEE15888 protocol; and calculating the frequency difference between the slave clock device and the master clock device in accordance with master clock information carried by the messages of the IEEE15888 protocol and the timestamps, and using the frequency difference to adjust second frequency information provided by the clock source module to be the frequency information which has the same frequency as the master clock device. According to the invention, an open-loop control system and the IEEE1588 protocol are utilized to realize the frequency synchronization, thus reducing the design cost of the system effectively, decreasing the control links and improving the accuracy effectively.

Description

technical field [0001] The invention relates to the field of data communication, in particular to providing a method for adjusting frequency based on the IEEE1588 protocol and a network device. Background technique [0002] At present, the clock synchronization through the IEEE1588 protocol is mainly phase synchronization, and the time difference between the master clock and the slave clock is calculated through the IEEE1588 protocol to adjust the phase. The method adopted in the system design of frequency recovery is to restore the Ethernet line clock through synchronous Ethernet technology; or adopt the IEEE1588 protocol closed-loop system, change the clock frequency of the hardware through the algorithm and affect the speed of the time stamp, and realize the frequency recovery through the IEEE1588 protocol Algorithms such as figure 1 As shown, the existing closed-loop system includes the following parts: [0003] Crystal oscillator: used to provide frequency information...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00
Inventor 庞贺
Owner ZTE CORP
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