A method and device for synchronizing time at an onu end of an xg-pon1 system

A technology of XG-PON1 and time synchronization, which is applied in the direction of time division multiplexing system, electrical components, multiplexing communication, etc. It can solve the problems that the ONU terminal cannot accurately output 1PPS and TOD signals, and the system cannot work normally.

Active Publication Date: 2018-01-02
FENGHUO COMM SCI & TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • 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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  • A method and device for synchronizing time at an onu end of an xg-pon1 system
  • A method and device for synchronizing time at an onu end of an xg-pon1 system

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the specific embodiments and the drawings of the specification.

[0032] Such as figure 1 As shown, an ONU side time synchronization device of the XG-PON1 system is provided for the present invention, which includes a downstream 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] The downstream data frame analysis circuit 10 and the clock recovery circuit 50 both receive the downstream data of the PON port. The output end of the downstream data frame analysis circuit 10 is connected to the input end of the CPU processing circuit 20 and the time synchronization processing circuit 30, respectively. The CPU processing circuit 20 passes time The synchronization processing circuit 30 is connected to the TOD serialization circuit 40. The output ends...

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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 an ONU end time synchronization method and device of an XG-PON1 system. Background technique [0002] XG-PON1, as an access network technology, has a higher rate and splitting ratio than GPON, smooth evolution from Gigabit Passive Optical Network (GPON) technology, and support for full-service operation capabilities, achieving low cost , Long-distance high-speed access. [0003] The XG-PON1 access system is composed of the central office optical line terminal equipment OLT and the remote optical network unit ONU equipment. Its physical layer rate is asymmetric, that is, the downstream rate is 10Gbit / s and the upstream rate is 2.5Gbit / s. The time synchronization function is defined in the XG-PON1 protocol G.987.3 formulated by the International Telecommunications Union Telecommunications Standardization Organization ITU-T. When the XG-PON1 equipment is used in the t...

Claims

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Application Information

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