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Frequency deviation detecting method and device

A frequency offset detection and frequency offset technology, which is applied in the field of communication and can solve the problems of inaccurate detection results of reference clock signals.

Active Publication Date: 2015-04-15
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Embodiments of the present invention provide a frequency offset detection method and device to solve the problem in the prior art that the detection result of the frequency offset of the reference clock signal is inaccurate due to the frequency offset of the local crystal oscillator itself and the parameter drift caused by aging.

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  • Frequency deviation detecting method and device

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Embodiment Construction

[0080] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0081] figure 1 It is a flow chart of the frequency offset detection method provided by Embodiment 1 of the present invention. The method in this embodiment is applicable to the case of performing frequency offset detection on a reference clock signal in an SDH synchronous network. The method is executed by a frequency offset detection device co...

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Abstract

Provided are a frequency shift detection method and device. The frequency shift detection method of the present invention comprises: calibrating a frequency shift of a clock signal output by a local oscillator of a network element; and performing frequency shift detection on a traced reference clock signal according to the calibrated clock signal output by the local oscillator. The embodiments of the present invention solve the problem in the prior art that a detection result of a frequency shift of a reference clock signal is inaccurate due to parameter drift caused because a local oscillator has a frequency shift and ages, thereby improving detection accuracy without replacing hardware.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a frequency offset detection method and device. Background technique [0002] The synchronous digital sequence (Synchronous Digital Hierarchy, referred to as SDH) network adopts a hierarchical master-slave synchronization method, that is, a single reference clock (Primary Reference Clock, referred to as PRC) is used to control the synchronization of the entire network through the synchronization link of the synchronization distribution network. The SDH network uses a A series of hierarchical clocks, each level of clock is synchronized with its upper level clock or the same level clock. The current-level network element equipment in the SDH network uses the clock signal transmitted by the upper-level network element equipment it tracks as a reference clock signal, and continues to transmit the reference clock signal to its lower-level network element equipmen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04J3/14
CPCH04J3/0691H03L7/07H04L7/0037H04L7/042
Inventor 刘旺刘永亮
Owner HUAWEI TECH CO LTD