Self-adapting clock method based on time stamp facing Ethernet circuit simulation service

A technology of circuit simulation and Ethernet, applied in electrical components, multiplexing communication, time division multiplexing system, etc., can solve the problems of large impact of delay and jitter, achieve strong comprehensive performance and overcome long lock-up time , The effect of eliminating the difference in service clock frequency

Active Publication Date: 2008-05-07
FENGHUO COMM SCI & TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is characterized by fast locking, requiring both ends to generate time stamps, and transmitting time stamps requires a certain amount of network bandwidth, and is greatly affected by network delay jitter

Method used

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  • Self-adapting clock method based on time stamp facing Ethernet circuit simulation service
  • Self-adapting clock method based on time stamp facing Ethernet circuit simulation service
  • Self-adapting clock method based on time stamp facing Ethernet circuit simulation service

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Experimental program
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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] The functional structure of a timestamp-based adaptive clock method (KBLTS) for Ethernet circuit emulation services is shown in FIG. 2 .

[0034] In the receiving PE (for the convenience of expression, the present invention refers to the PE that implements the self-adaptive recovery clock as receiving PE, and the PE communicating with it is called sending PE. In fact, all PEs can be either sending PE or receiving PE) , the receive buffer is used to buffer the TDM information carried in the data packet arriving from the Ethernet side to absorb the delay jitter caused by the network. The Ethernet side periodically writes data to the debounce buffer, while the TDM side continuously reads data from the debounce buffer to restore the TDM code stream. When there is a difference in the service clocks at both ends, there is a difference in the speed o...

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PUM

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Abstract

The present invention relates to a clock synchronization method in the Ethernet circuit simulation business, in specific to an adaptive clock method based on the time stamp which faces to the Ethernet simulation operation. The method utilizes the local operation clock and counter to obtain the time stamp information (local time stamp) which represents the remote terminal and proximate operation clocks; the time stamp information is converted into random sequence which meets the kalman process and a measurement equation and the kalman filtering algorithm is used to filter noise from the sequence to obtain the real time stamp; the obtained real time stamp is used for regulating a voltage control oscillator to make local operation clock to track the remote terminal operation clock. The method adopts the kalman algorithm which makes the loop filtration can choose hardware to or software to realize; the application is more flexible; the frequency difference is monotonically decreasing basically without vibration and the lock anchor can be reached fast. Compared with the ordinary buffer zone method and time stamp method, the comprehensive function of the present invention is stronger.

Description

technical field [0001] The invention relates to a clock synchronization method in an Ethernet circuit simulation service, in particular to a timestamp-based self-adaptive clock method for the Ethernet circuit simulation service. Background technique [0002] The industry agrees that the next-generation network is a network based on high-speed packet technology, and has the ability to carry multiple services such as voice, video and data at the same time. The Internet, the largest packet network, will be the main body of the next-generation network. Mainstream packet technologies such as IP and Ethernet are the key technologies to realize the integration of computer Internet, traditional telephone network and cable TV network. [0003] As far as Ethernet technology is concerned, at present, this technology has occupied more than 90% of the application share in the access layer, and the various advantages of Ethernet technology in the local area network are gradually making it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
Inventor 戴锦友余少华
Owner FENGHUO COMM SCI & TECH CO LTD
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