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ONU-end time synchronization method and apparatus of XG-PON1 system

An XG-PON1, time synchronization technology, applied in time division multiplexing systems, electrical components, multiplexing communications, etc., to solve the problems that the system cannot work normally, and the ONU cannot accurately output 1PPS and TOD signals.

Active Publication Date: 2016-03-30
FENGHUO COMM SCI & TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] When the clock at the ONU end is out of sync, the ONU end cannot accurately output 1PPS and TOD signals, which will cause the system to fail to work normally

Method used

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  • ONU-end time synchronization method and apparatus of XG-PON1 system
  • ONU-end time synchronization method and apparatus of XG-PON1 system

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with specific implementation methods and accompanying drawings.

[0032] like figure 1 As shown, the present invention provides an ONU terminal time synchronization device of an XG-PON1 system, including a downlink data frame analysis circuit 10, a CPU processing circuit 20, a time synchronization processing circuit 30, a TOD serialization circuit 40, and a clock recovery circuit 50 and clock selection circuit 60.

[0033] Both the downlink data frame analysis circuit 10 and the clock recovery circuit 50 receive the downlink data of the PON port, and the output ends of the downlink data frame analysis circuit 10 are respectively connected to the input ends of the CPU processing circuit 20 and the time synchronization processing circuit 30, and the CPU processing circuit 20 passes through time The synchronous processing circuit 30 is connected to the TOD serialization circuit 40, and the output termi...

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Abstract

The invention discloses an ONU-end time synchronization method and apparatus of an XG-PON1 system. The method comprises the following steps: determining whether downlink data frames received by an ONU are synchronous, and if not, outputting corresponding 1PPS and TOD signals through a local crystal oscillator clock; if so, extracting OMCI frames including the TOD information from the downlink data frames and obtaining SFC values of the OMCI frames through an analysis, comparing the SFC values with multiframe counting values SFC of the downlink data frames, and if they are equal, after time-delay compensation, outputting the corresponding 1PPS and TOD signals by use of frame header indication signals and corresponding time information; and if the SFC values are not equal, outputting the corresponding 1PPS and TOD signals through a line recovery clock. According to the invention, no matter whether an ONU-end clock synchronizes or not, an ONU end can accurately output accurate 1PPS and TOD signals, and the system works normally even without signal output.

Description

technical field [0001] The invention relates to the field of communication passive optical networks, in particular to a method and device for synchronizing time at an ONU end of an XG-PON1 system. Background technique [0002] As an access network technology, XG-PON1 has advantages such as higher speed and optical splitting ratio compared with GPON, smooth evolution from Gigabit Passive Optical Network (GPON) technology, support for full-service operation capabilities, and low cost , Long-distance high-speed access. [0003] The XG-PON1 access system is composed of central office optical line terminal equipment OLT and remote optical network unit ONU equipment. Its physical layer rate is asymmetrical, that is, the downlink rate is 10Gbit / s, and the uplink rate is 2.5Gbit / s. The time synchronization function is defined in the XG-PON1 protocol G.987.3 developed by the International Telecommunication Union Telecommunication Standardization Organization ITU-T. When the XG-PON1 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
CPCH04J3/0635
Inventor 刘登强
Owner FENGHUO COMM SCI & TECH CO LTD
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