CN102386990B - Method and device for realizing 1588 clock synchronization in OTN system - Google Patents
Method and device for realizing 1588 clock synchronization in OTN system Download PDFInfo
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- CN102386990B CN102386990B CN201110432089.5A CN201110432089A CN102386990B CN 102386990 B CN102386990 B CN 102386990B CN 201110432089 A CN201110432089 A CN 201110432089A CN 102386990 B CN102386990 B CN 102386990B
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Abstract
The invention discloses a method and a device for realizing 1588 clock synchronization in an OTN (Optical Transport Network) system. In the method, an OTN service signal input from a client side is divided into two identical signals before being subjected to OTN service processing, the 1588 clock information is extracted from one of the two signals and transmitted to a line side through a channel not subjected to complicated OTN processing, the other signal is transmitted to the line side after being subjected to OTN service processing, and the 1588 clock information is sent to the other signal subjected to the OTN service processing on the line side and then sent out. The 1588 clock information is extracted before the OTN service signal is subjected to OTN processing, and transmitted on the channel not subjected to the OTN processing, and after the OTN service signal is subjected to OTN processing, the 1588 clock information is re-sent to the OTN service signal, so that the 1588 clock information error caused by nonuniform single-disk chip processing time and the system stability is improved under the condition that any extra signal expense is not occupied.
Description
Technical field
The present invention relates to technical field of optical network communication, be specifically related to realize method and the device of 1588 clock synchronous in OTN system.
Background technology
Along with the development of developing rapidly of data service, particularly broadband and video traffic, user has proposed new requirements at the higher level to the transmission network of operator.Not only require transmission network to want accurately to transmit Ethernet service, and also more and more higher to the requirement of Ethernet transmission real-time.Under this background, IEEE1588 clock is issued out with canonical form, its low cost, and the features such as high accuracy make this technology obtain and promoted widely and use in light transmission field.
But, in existing OTN equipment, due to unavoidable causes such as facility switching or service disconnection, in the time of often can causing chip to process 1588 clock, produce unfixed time delay, thereby transmission precision reduced.
Summary of the invention
Technical problem to be solved by this invention is to produce unfixed time delay while processing 1588 clock in solution OTN equipment, thus the problem that transmission precision is reduced.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is to provide the method for 1588 clock synchronous in a kind of OTN of realization system, before OTN service signal from customer side input is carried out to OTN Business Processing, be divided into identical two paths of signals, the passage that extracting 1588 clock informations from a road signal does not wherein have complicated OTN to process at another transfers to line side, another road signal transfers to line side after completing OTN Business Processing, in line side, described 1588 clock informations are sent it back through exporting in described another road signal after OTN Business Processing.
In said method, described OTN Business Processing comprises intersection pre-treatment, cross processing and intersection reprocessing three phases.
In said method, intersecting pretreatment stage, the OTN service signal of inputting from customer side intersects before pre-treatment operation, be divided into first, second identical two paths of signals, and the passage that extracts 1588 clock informations do not have complicated OTN to process at another from described the second road signal transfers to Cross Trade; In the cross processing stage, described first via signal is carried out to cross processing operation; Intersecting post-processing stages, described first via signal transfers to line side after intersection post-processing operation, the passage that extract described 1588 clock informations from Cross Trade does not have complicated OTN to process at another simultaneously transfers to line side, in line side, described 1588 clock informations has been sent it back to intersect in the described first via signal of post-processing operation to export.
In said method, intersecting pretreatment stage, the OTN service signal of inputting from customer side intersects before pre-treatment operation, be divided into first, second identical two paths of signals, and the passage that extracts the one 1588 clock information do not have complicated OTN to process at another from described the second road signal transmits, at first via signal, complete and intersect after pre-treatment operation, by described the one 1588 clock information sent it back intersect form in the described first via signal of pre-treatment operation in the middle of OTN service signal; In the cross processing stage, OTN service signal in the middle of described is carried out to cross processing operation; Intersecting post-processing stages, middle OTN service signal after cross processing is divided into the 3rd, the 4th identical two paths of signals, described Third Road signal transfers to line side after cross processing operation, the passage that extract the 2 1588 clock information from the signal of described Si road does not have complicated OTN to process at another simultaneously transfers to line side, in line side, described the 2 1588 clock information has been sent it back to intersect in the described Third Road signal of post-processing operation to export.
In said method, described the one 1588 clock information is kept in the Cross Trade of OTN system.
The present invention also provides the device of 1588 clock synchronous in a kind of OTN of realization system, comprise partial wave module, the one 1588 Clock Extraction module, OTN Service Processing Module and the 2 1588 Clock Extraction module, described partial wave module was divided into identical two paths of signals by the corresponding OTN service signal of input before carrying out OTN Business Processing; Described the one 1588 Clock Extraction module extracts 1588 clock informations from described two paths of signals Zhong mono-road signal; Described OTN Service Processing Module is carried out corresponding OTN Business Processing; Described the 2 1588 clock input module, extracts described 1588 clock informations and has sent it back in OTN Business Processing another road signal afterwards, and described 1588 clock informations transmit on a passage that does not have complicated OTN to process.
In said apparatus, described OTN Service Processing Module comprises the first processing unit, cross processing unit and the second processing unit, and described the first processing unit intersects pre-treatment operation; Described cross processing unit carries out cross processing operation; Described the second processing unit intersects post-processing operation.
In said apparatus, before the first processing unit intersects pre-treatment, described partial wave module will be divided into first, second identical two paths of signals from the OTN service signal of customer side input, and the passage that described the one 1588 Clock Extraction module extracts 1588 clock informations from described the second road signal and do not have complicated OTN to process through another transfers to described cross processing unit, and described 1588 clock informations are preserved in described cross processing unit; Described cross processing unit carries out cross processing operation and exports described the second processing unit to described first via signal; Described the second processing unit intersects post-processing operation transfer to line side to described first via signal, described the 2 1588 Clock Extraction module extracts described 1588 clock informations from described cross processing unit simultaneously, and transfer to line side on the passage that does not have complicated OTN to process through another, in line side, described the 2 1588 Clock Extraction module has sent it back described 1588 clock informations in the described first via signal of OTN Business Processing and has exported from line side.
In said apparatus, described partial wave module comprises first, second partial wave module, before the first processing unit intersects pre-treatment, described the first partial wave module will be divided into first, second identical two paths of signals from the OTN service signal of customer side input, and the passage that described the one 1588 Clock Extraction module extracts the one 1588 clock information from described the second road signal does not have complicated OTN to process through another transmits, after described the first processing unit processes, by described the one 1588 clock information sent it back intersect form in the described first via signal of pre-treatment operation in the middle of OTN service signal, described cross processing unit carries out cross processing to OTN service signal in the middle of described, before described the second processing unit intersects reprocessing, described the second partial wave module is divided into the identical the 3rd by the middle OTN service signal from described cross processing unit output, the 4th two paths of signals, described the second processing unit intersects post-processing operation transfer to line side to described Third Road signal, the passage that described the 2 1588 Clock Extraction module extracts the 2 1588 clock information and do not have complicated OTN to process through another from the signal of described Si road transfers to line side, in the 2 1588 Clock Extraction module described in line side, described the 2 1588 clock information has been sent it back to intersect in the described Third Road signal of post-processing operation and exported from line side.
The present invention, by 1588 clock informations are carried out before corresponding OTN processes extracting at OTN service signal, on the passage that does not have complicated OTN to process at another, transmit, after the OTN of OTN service signal finishes dealing with, 1588 clock informations are resend in OTN service signal, can, in the situation that not taking any extra expense, reduce, because of the uneven 1588 clock information errors that produce of single-deck chip processing time, to improve the stability of a system.
Accompanying drawing explanation
Fig. 1 is embodiment of the method one schematic flow sheet that the present invention realizes 1588 clock synchronous in OTN system;
Fig. 2 is embodiment of the method two schematic flow sheets that the present invention realizes 1588 clock synchronous in OTN system;
Fig. 3 is device embodiment mono-structural representation that the present invention realizes 1588 clock synchronous in OTN system;
Fig. 4 is device embodiment bis-structural representations that the present invention realizes 1588 clock synchronous in OTN system.
Embodiment
The invention provides method and the device of 1588 clock synchronous in a kind of OTN of realization system, can, in the situation that not taking any extra expense, reduce, because of the uneven 1588 clock information errors that produce of single-deck chip processing time, to improve the stability of a system.The technical scheme adopting is: before the OTN service signal from customer side input is carried out to OTN Business Processing, be divided into identical two paths of signals, the passage that extracting 1588 clock informations from a road signal does not wherein have complicated OTN to process at another transfers to line side, another road signal transfers to line side after completing OTN Business Processing, in line side, described 1588 clock informations is sent it back through exporting in described another road signal after OTN Business Processing.Wherein, OTN Business Processing comprises intersection pre-treatment, cross processing and intersection reprocessing three phases.
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment mono-:
Fig. 1 is embodiment of the method one schematic flow sheet that the present invention realizes 1588 clock synchronous in OTN system, and as shown in Figure 1, method provided by the invention, comprises the following steps:
101, intersecting pretreatment stage, the OTN service signal from customer side input is being intersected before pre-treatment operation, be divided into first, second identical two paths of signals, and extract 1588 clock informations from the second road signal;
102, the passage that 1588 clock informations that extract do not have complicated OTN to process by another is input in Cross Trade and preserves, the passage that does not wherein have complicated OTN to process refers to by electronic devices such as the pin of a plurality of integrated circuits and electric capacity, resistance and forms electronics path, while transmitting on this path due to signal, without the inter-process of integrated circuit, therefore almost there is no time delay;
103, in Cross Trade, first via signal is carried out to cross processing operation;
104, intersecting post-processing stages, 1588 clock informations of preserving in Cross Trade are extracted, and there is no channel transfer that complicated OTN processes to line side through another, in line side, described 1588 clock informations have been sent it back to intersect in the described first via signal of post-processing operation and exported.
Embodiment bis-:
Fig. 2 is embodiment of the method two schematic flow sheets that the present invention realizes 1588 clock synchronous in OTN system, and as shown in Figure 2, method provided by the invention comprises the following steps;
201, intersecting pretreatment stage, before intersecting pre-treatment operation from the OTN service signal of customer side input, be divided into first, second identical two paths of signals, and extract the one 1588 clock information from the second road signal;
202, the one 1588 clock information is through a channel transfer that does not have complicated OTN to process, and completes and intersect after pre-treatment operation at first via signal, by the one 1588 clock information send it back in first via signal, form in the middle of OTN service signal;
203,, in the cross processing stage, Cross Trade is carried out cross processing operation to middle OTN service signal;
204, intersecting post-processing stages, the middle OTN service signal through cross processing is divided into the 3rd, the 4th identical two paths of signals, and extracts the 2 1588 clock information in Cong tetra-road signals;
205, the 2 1588 clock information transfers to line side on a passage that does not have complicated OTN to process, Third Road signal also transfers to line side after completing intersection pre-treatment operation, together output in line side sends it back Third Road signal by the 2 1588 clock information.
The present invention also provides the device of 1588 clock synchronous in a kind of OTN of realization system, comprise partial wave module, the one 1588 Clock Extraction module, OTN Service Processing Module and the 2 1588 Clock Extraction module, described partial wave module was divided into identical two paths of signals by the OTN service signal of input before carrying out OTN Business Processing; Described 1588 Clock Extraction modules extract 1588 clock informations from described two paths of signals Zhong mono-road signal; Described OTN Service Processing Module is carried out corresponding OTN Business Processing; Described the 2 1588 Clock Extraction module has sent it back described 1588 clock informations in OTN Business Processing another road signal afterwards, and wherein said 1588 clock informations transmit on a passage that does not have complicated OTN to process.Described OTN Service Processing Module comprises the first processing unit, cross processing unit and the second processing unit, and described the first processing unit intersects pre-treatment; Described cross processing unit carries out cross processing; Described the second processing unit intersects reprocessing.
Below by two specific embodiments and in conjunction with Figure of description, device provided by the invention is described in detail.
Embodiment mono-:
As shown in Figure 3, OTN service signal enters partial wave module 301 from customer side, and before the first processing unit 302 intersects pre-treatment, partial wave module 301 is divided into first, second identical two paths of signals by the OTN service signal of input.
The one 1588 Clock Extraction module 303 extracts 1588 clock informations from the second road signal, and preserve by exporting Cross Trade 304 on a passage that does not have complicated OTN to process, the first 302 pairs of processing units first via signal intersects pre-treatment operation, and first via signal completes to intersect after pre-treatment operation and also exports Cross Trade 304 to.
304 pairs of first via signals of Cross Trade carry out cross processing and export the second processing unit 305 to.
The second 305 pairs of processing units first via signal intersects post-processing operation export line side to, simultaneously, the 2 1588 Clock Extraction module 306 extracts 1588 clock informations and exports line side to by a passage that does not have complicated OTN to process from Cross Trade 304, after 305 pairs of first via signals of the second processing unit complete intersection reprocessing, 1588 clock informations are sent it back in first via signal, from line side, export.
Embodiment bis-:
As shown in Figure 4, OTN service signal enters the first partial wave module 401 from customer side, and before the first processing unit 402 intersects pre-treatment, the first partial wave module 401 is divided into first, second identical two paths of signals by the OTN service signal of input.
The one 1588 Clock Extraction module 403 extracts the one 1588 clock information from the second road signal, and by a channel transfer that does not have complicated OTN to process.
After 402 pairs of first via signals of the first processing unit complete intersection pre-treatment operation, the one 1588 Clock Extraction module 403 sends it back the middle OTN service signal of formation in first signal by the one 1588 clock information and is sent to Cross Trade 304.
304 pairs of middle OTN service signals of Cross Trade carry out exporting the second partial wave module 407 to after cross processing, before the second processing unit 405 intersects reprocessing, the second partial wave module 407 is divided into the 3rd, the 4th identical two paths of signals by the middle OTN service signal of input.
The second 405 pairs of processing units Third Road signal intersects post-processing operation, in the 2 1588 Clock Extraction module 406 Cong tetra-road signals, extracts the 2 1588 clock information, and there is no channel transfer that complicated OTN processes to line side by one.
The second 405 pairs of processing units Third Road signal intersects after post-processing operation and also exports line side to, after 405 pairs of Third Road signals of the second processing unit complete intersection pre-treatment operation, the 2 1588 Clock Extraction module 406 sends it back the 2 1588 clock information in the 3rd signal, from line side, exports.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (3)
1. the method that realizes 1588 clock synchronous in OTN system, is characterized in that,
Before OTN service signal from customer side input is carried out to OTN Business Processing, be divided into identical two paths of signals, the passage that extracting 1588 clock informations from a road signal does not wherein have complicated OTN to process at another transfers to line side, another road signal transfers to line side after completing OTN Business Processing, in line side, described 1588 clock informations is sent it back through exporting in described another road signal after OTN Business Processing;
Described OTN Business Processing comprises intersection pre-treatment, cross processing and intersection reprocessing three phases;
Intersecting pretreatment stage, the OTN service signal of inputting from customer side intersects before pre-treatment operation, be divided into first, second identical two paths of signals, and the passage that extracts the one 1588 clock information do not have complicated OTN to process at another from described the second road signal transmits, at first via signal, complete and intersect after pre-treatment operation, by described the one 1588 clock information sent it back intersect form in the described first via signal of pre-treatment operation in the middle of OTN service signal;
In the cross processing stage, OTN service signal in the middle of described is carried out to cross processing operation;
Intersecting post-processing stages, middle OTN service signal after cross processing is divided into the 3rd, the 4th identical two paths of signals, described Third Road signal transfers to line side after cross processing operation, the passage that extract the 2 1588 clock information from the signal of described Si road does not have complicated OTN to process at another simultaneously transfers to line side, in line side, described the 2 1588 clock information has been sent it back to intersect in the described Third Road signal of post-processing operation to export.
2. the method that realizes 1588 clock synchronous in OTN system as claimed in claim 1, is characterized in that, described the one 1588 clock information is kept in the Cross Trade of OTN system.
3. the device of realizing 1588 clock synchronous in OTN system, is characterized in that, comprising:
Partial wave module was divided into identical two paths of signals by the corresponding OTN service signal of input before carrying out OTN Business Processing;
The one 1588 Clock Extraction module extracts 1588 clock informations from described two paths of signals Zhong mono-road signal;
OTN Service Processing Module, carries out corresponding OTN Business Processing;
The 2 1588 Clock Extraction module, extracts described 1588 clock informations and has sent it back in OTN Business Processing another road signal afterwards, from line side, exports;
Described 1588 clock informations transmit on a passage that does not have complicated OTN to process;
Described OTN Service Processing Module comprises:
The first processing unit, the pre-treatment that intersects operation;
Cross processing unit, carries out cross processing operation;
The second processing unit, intersects post-processing operation;
Described partial wave module comprises first, second partial wave module;
Before the first processing unit intersects pre-treatment, described the first partial wave module will be divided into first, second identical two paths of signals from the OTN service signal of customer side input, and the passage that described the one 1588 Clock Extraction module extracts the one 1588 clock information from described the second road signal does not have complicated OTN to process through another transmits, after described the first processing unit processes, by described the one 1588 clock information sent it back intersect form in the described first via signal of pre-treatment operation in the middle of OTN service signal;
Described cross processing unit carries out cross processing to OTN service signal in the middle of described;
Before described the second processing unit intersects reprocessing, described the second partial wave module is divided into the identical the 3rd by the middle OTN service signal from described cross processing unit output, the 4th two paths of signals, described the second processing unit intersects post-processing operation transfer to line side to described Third Road signal, the passage that described the 2 1588 Clock Extraction module extracts the 2 1588 clock information and do not have complicated OTN to process through another from the signal of described Si road transfers to line side, in the 2 1588 Clock Extraction module described in line side, described the 2 1588 clock information has been sent it back to intersect in the described Third Road signal of post-processing operation and exported from line side.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101447850A (en) * | 2007-11-28 | 2009-06-03 | 中兴通讯股份有限公司 | Device for transmitting and receiving clock by utilizing optical supervisory channel and method for sending clock |
| CN101577600A (en) * | 2008-05-09 | 2009-11-11 | 华为技术有限公司 | Time synchronization method, system and optical network equipment for passive optical network system |
| CN102045155A (en) * | 2010-10-22 | 2011-05-04 | 中兴通讯股份有限公司 | Method and device for transmitting time information |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100568796C (en) * | 2006-02-09 | 2009-12-09 | 中兴通讯股份有限公司 | High-speed optical forward unit with double mode jitter performance compatibility |
| US8295310B2 (en) * | 2006-09-25 | 2012-10-23 | Futurewei Technologies, Inc. | Inter-packet gap network clock synchronization |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101447850A (en) * | 2007-11-28 | 2009-06-03 | 中兴通讯股份有限公司 | Device for transmitting and receiving clock by utilizing optical supervisory channel and method for sending clock |
| CN101577600A (en) * | 2008-05-09 | 2009-11-11 | 华为技术有限公司 | Time synchronization method, system and optical network equipment for passive optical network system |
| CN102045155A (en) * | 2010-10-22 | 2011-05-04 | 中兴通讯股份有限公司 | Method and device for transmitting time information |
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