CN1298140C - Method for frame head jitter processing in SDH data transmission system - Google Patents
Method for frame head jitter processing in SDH data transmission system Download PDFInfo
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- CN1298140C CN1298140C CNB2003101035781A CN200310103578A CN1298140C CN 1298140 C CN1298140 C CN 1298140C CN B2003101035781 A CNB2003101035781 A CN B2003101035781A CN 200310103578 A CN200310103578 A CN 200310103578A CN 1298140 C CN1298140 C CN 1298140C
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- frame head
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- data transmission
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Abstract
The present invention discloses a method for processing frame head jitter in an SDH data transmission system, which belongs to the field of data communication. The method comprises the following steps: firstly, using the output frame head signals of the previous frame of a data flow as reference for counting; then, judging the type of the frame head jitter in the system according to the position relation between a counting value and the next frame head and arranging corresponding zone bits; subsequently, positioning the frame head signals according to the zone bits. When an external frame head jitters relative to a normal position, an output system frame head corrects the jitter by positioning and outputs a periodic system frame head. Compared with the method of the prior art, the method of the present invention saves system cost and simultaneously makes work conditions more comfortable.
Description
Technical field
The present invention relates to communication field, relate in particular to the method for SDH data transmission system frame head dithering process.
Background technology
Along with developing rapidly of internet and enterprise network, data communication has also obtained increasingly extensive application in social every field, the data communication system that comparatively extensively adopts is the SDH transmission system at present, and under the situation that social demand strengthens day by day, the SDH transmission technology is also in continuous development.In the SDH transmission system, mainly comprise parts such as clock board and cross board, wherein, clock board is responsible for sending periodic system header signal to cross board, and cross board is caught and located this system's frame head, is used as the alignment mark of frame data stream in the cross board, also determined simultaneously the alignment situation of cross board data flow output, if system's header signal of clock board output can not periodically be sent because of shake, so just may cause the intersection error in data, cause system to reset again.Therefore in the work of SDH transmission system, the header signal that clock board is sent has very strict requirement.But actual conditions are, because the factors such as fluctuation of ambient temperature, voltage, usually make system's frame head produce shake, clock is gathered with respect to desirable periodic system frame head all the time to system on the cross board forward or backward skew, thereby cause data not have positioned in alignment, cause the data cross failure.Solution to this problem is by increase the process chip or the module of Adjustment System frame head on clock board now, to satisfy to the comparatively strict specification requirement of clock board, so just increase system cost undoubtedly, also increased the complexity of clock board design simultaneously.By disclosed patent and patent applications such as retrieval China national Department of Intellectual Property and United States Patent (USP) trademark offices, find no and imitate the technical scheme that addresses the above problem.
Summary of the invention
The objective of the invention is to reorientate when the SDH transmission system that exists in the prior art is shaken because of the periodic system frame head in order to overcome, and clock board produced the demanding shortcoming of system's frame head, in the hope of the method for the SDH data transmission system frame head dithering process that realizes lower cost and simplicity of design.
For achieving the above object, the present invention proposes a kind of method of SDH data transmission system frame head dithering process, it is characterized in that, may further comprise the steps:
The first step: the output header signal with the data flow former frame is counted as benchmark, position according to this count value and next frame head concerns then, judge the type of system's frame head shake and (shake a byte forward, the normal position or shake a byte backward), corresponding marker bit is set;
Second step: according to flag bit header signal is positioned, when outside frame head has shake with respect to the normal position, this shake will be corrected in the location of output system frame head, and export periodic system frame head.
The method of the invention is by judging whether system's frame head produces shake and wobble type, and handle according to the drift situation of system's frame head, can make the SDH system at work, need not provide strict requirement by drift and the width to system's frame head at the clock board place, and the work chip can be realized the frame head alignment and the location of data flow equally, so just saved the cost of system, made condition of work more loose simultaneously.
Description of drawings
Fig. 1 is the method flow diagram of SDH data transmission system frame head dithering process of the present invention.
Fig. 2 is through the method for the invention result schematic diagram.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
The present invention relates generally in the SDH transmission system of communication field, and system's frame head front and back shake that clock board is sent owing to some fortuitous event influences the solution situation of the inaccurate problem in data location.
According to content shown in Figure 1, the method for the invention is counted based on system's frame head of output; When just resetting, be reference count with primary input frame head.Determine the type of this system's frame head according to the count value of input and system's frame head correspondence position of input with respect to desirable periodic system frame head shake.At first postpone in 1 the system's frame head that receives to be done the delay of a clock cycle, send a header signal that postpones a word byte with respect to system's frame head at frame head; Postpone in 2 the header signal that receives to be done the delay of a clock cycle again at frame head then, export the header signal that the delay of two bytes is arranged with respect to system's frame head; At last, frame head output is selected according to system's frame head wobble type of input header signal is selected output, if system's frame head is shaken a byte forward, and system's header signal of two bytes of output delay then; If give birth to byte of shake backward, then export the system's header signal that receives; If system's frame head is normally exported, system's header signal of a byte of output delay then.
Accompanying drawing 2 is frame head dithering process result's a schematic diagram, from the figure as can be seen: when system's frame head of input has shake with respect to desirable periodicity frame head, no matter it is shaken a byte forward and shakes a byte or just often backward, all exports the desirable header signal of one-period according to this patent method.
The present invention has realized the processing to system frame head shake location, solved the abnormal problem of system works that causes because of the shake of external system frame head effectively, alleviate clock board in the SDH system simultaneously and sent the pressure of system's frame head stringent condition, reduced the cost of clock board.
Claims (2)
1, a kind of method of SDH data transmission system frame head dithering process is characterized in that, may further comprise the steps:
The first step: with primary input frame head is reference count, determines the type of this system's frame head with respect to desirable periodic system frame head shake according to the count value of input and system's frame head correspondence position of input;
Second step: the system's frame head that receives is postponed a clock cycle earlier, send the signal that the relative system frame head postpones a byte; Then the header signal that receives is postponed a clock cycle again, send the signal that the relative system frame head postpones two bytes; If system's frame head is shaken a byte forward, system's header signal of two bytes of output delay; If shake a byte backward, system's header signal that output receives; If system's frame head is normal, system's header signal of a byte of output delay.
2, the method for SDH data transmission system frame head dithering process according to claim 1 is characterized in that, the system's frame head wobble type in the described first step comprises: shake a byte, normal position forward and shake a byte backward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101035781A CN1298140C (en) | 2003-11-11 | 2003-11-11 | Method for frame head jitter processing in SDH data transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101035781A CN1298140C (en) | 2003-11-11 | 2003-11-11 | Method for frame head jitter processing in SDH data transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1545249A CN1545249A (en) | 2004-11-10 |
| CN1298140C true CN1298140C (en) | 2007-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003101035781A Expired - Fee Related CN1298140C (en) | 2003-11-11 | 2003-11-11 | Method for frame head jitter processing in SDH data transmission system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162958B (en) * | 2006-10-11 | 2012-04-18 | 中兴通讯股份有限公司 | Method of sampling signal of locating frame head in SDH transmission system |
| CN101145863B (en) * | 2007-03-21 | 2012-07-18 | 中兴通讯股份有限公司 | Device and method for detecting system frame header deviation |
| CN101808019B (en) * | 2010-04-02 | 2012-07-25 | 烽火通信科技股份有限公司 | Method for detecting clock out-of-lock of line interface disk of SDH device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177243A (en) * | 1996-09-13 | 1998-03-25 | 清华大学 | Method and device for double self-following frequency prediction to restore end branch clock |
| CN1249870A (en) * | 1997-03-06 | 2000-04-05 | 艾利森电话股份有限公司 | Continuous synchronization adjustment in telecommunications system |
| CN1249641A (en) * | 1998-09-17 | 2000-04-05 | 朗迅科技公司 | Time synchronization of grouped radio signals for transmitting to base station |
-
2003
- 2003-11-11 CN CNB2003101035781A patent/CN1298140C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177243A (en) * | 1996-09-13 | 1998-03-25 | 清华大学 | Method and device for double self-following frequency prediction to restore end branch clock |
| CN1249870A (en) * | 1997-03-06 | 2000-04-05 | 艾利森电话股份有限公司 | Continuous synchronization adjustment in telecommunications system |
| CN1249641A (en) * | 1998-09-17 | 2000-04-05 | 朗迅科技公司 | Time synchronization of grouped radio signals for transmitting to base station |
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| CN1545249A (en) | 2004-11-10 |
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Effective date of registration: 20151117 Address after: Dameisha Yantian District of Shenzhen City, Guangdong province 518085 Building No. 1 Patentee after: SANECHIPS TECHNOLOGY Co.,Ltd. Address before: 518057 Nanshan District high tech Industrial Park, Guangdong, South Road, science and technology, ZTE building, legal department Patentee before: ZTE Corp. |
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Application publication date: 20041110 Assignee: Xi'an Chris Semiconductor Technology Co.,Ltd. Assignor: SANECHIPS TECHNOLOGY Co.,Ltd. Contract record no.: 2019440020036 Denomination of invention: Method for frame head jitter processing in SDH data transmission system Granted publication date: 20070131 License type: Common License Record date: 20190619 |
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Granted publication date: 20070131 Termination date: 20211111 |