CN101980463A - Adaptive clock processing method and device in packet transport network - Google Patents
Adaptive clock processing method and device in packet transport network Download PDFInfo
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- CN101980463A CN101980463A CN2010105214193A CN201010521419A CN101980463A CN 101980463 A CN101980463 A CN 101980463A CN 2010105214193 A CN2010105214193 A CN 2010105214193A CN 201010521419 A CN201010521419 A CN 201010521419A CN 101980463 A CN101980463 A CN 101980463A
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Abstract
The invention discloses an adaptive clock processing method and an adaptive clock processing device in a packet transport network. The method comprises the following steps of: monitoring the state of a clock which is configured to be an adaptive clock of time division multiplexing (TDM) service; and performing restoration operation on the adaptive clock when state abnormity of the adaptive clock of the TDM service is detected. Through the method and the device, clock abnormity caused by network abnormity can be quickly discovered by actively monitoring the adaptive clock of the TDM service, so that the adaptive clock of the TDM service in the abnormal state can be immediately restored to further restore the TDM service.
Description
Technical field
The present invention relates to grouping conveying network (PTN, Packet Transport Network) equipment and technology, relate in particular to time division multiplexing in the PTN equipment (TDM, Time Division Multiplexing) service adaptation clock processing method and device.
Background technology
The clock recovery of the TDM business of PTN is different from the clock recovery of the TDM business of traditional SDH (Synchronous Digital Hierarchy) (SDH, Synchronous Digital Hierarchy) transmission network and optical transfer network (OTN, Optical TransportNetwork).
In traditional transmission network, the speed of physical carrier frame is relatively-stationary, and the frame frequency that receiver side only need send over network side carries out frequency division according to fixing speed and calculates the clock signal that just can adapt to transmission system.
The TDM business clock of PTN then can't adopt said method to carry out clock recovery.Reason is among the PTN it is to transmit after adopting the packing forms of Ethernet service to encapsulate the TDM business datum.Because the speed of the packet of Ethernet bearing is unfixed, the principle that Ethernet is followed is that professional just group bag is arranged, and the node that does not have service link will be released by other takies; And because the characteristic of Ethernet exchange, packet tends to " congested " phenomenon occur in the transmission course from the source node to the destination node, causes destination to can not receive packet in a period of time.Therefore, recover the clock of the transmission TDM business of source node in destination node, the frequency that only relies on network side to receive bag is carried out frequency division, can't satisfy the requirement of TDM service clock recovery.For the clock recovery problem of the TDM business that solves PTN, the theory of self-adaptation clock has been proposed on the TDM of PTN Business Processing.
The adaptive clock recovery technology is a clock recovery technology important in the PTN packet switch at present, and the clock recovery technology that is useful for each interface of E1, T1, channelizing STM-1 and ATM plate all is to adopt the prototype of adaptive clock recovery technology.
There are serious problems in the adaptive clock recovery of the TDM business of current techique, promptly PTN occur network unusual after, when TDM service traffics in the network were recovered from unusual, it is normal that its self-adaptation clock but can not in time recover.
Because the peculiar random signal characteristic of packet network tends to produce some beyond thought signal noise stacks, causes network unusual, congested such as what wrap, scheduling time is long, and the speed of bag is discontinuous, and the network signal shake is excessive or the like.After network occurred unusually, when network traffics were recovered from unusual, self-adaptation clock but can not recovery from unusual.Concrete phenomenon shows as, when the flow of network side become suddenly very greatly or during the very for a short time lock-in range that exceeds phase-locked loop, the self-adaptation clock processing module can't locked clock and enter abnormality, this is normal; But after the network side flow recovered normally, the self-adaptation clock processing module still can not be recovered normal condition rapidly and locked clock, thereby makes the TDM business can't recover normal.
Summary of the invention
Technical problem to be solved by this invention provides self-adaptation clock processing method and device in a kind of Packet Transport Network, can make in time to recover normal at TDM service adaptation clock from unusual when flow recovers.
In order to solve the problems of the technologies described above, the invention provides self-adaptation clock processing method in a kind of Packet Transport Network, comprising:
State to the self-adaptation clock clock that is configured to TDM service is monitored; When the abnormal state of the self-adaptation clock that detects TDM service, self-adaptation clock is carried out recovery operation.
Further, the state of the self-adaptation clock clock that is configured to TDM service is monitored, is specifically comprised:
Periodically poll all adopt the TDM service of self-adaptation clocks, after self-adaptation clock is finished normal locking, TDM service is received buffering area accordingly whether overflows and detect.
Further, detect the abnormal state of the self-adaptation clock of described TDM service, specifically comprise:
When detecting number of times that described reception buffering area overflows continuously and exceed threshold, judge the abnormal state of corresponding self-adaptation clock; Wherein, receive overflowing of buffering area and comprise overflow or underflow.
Further, self-adaptation clock is carried out recovery operation, specifically by any one realization in the following dual mode:
First kind, by the self-adaptation clock that all the is configured to TDM service realization recovery operation that resets, the self-adaptation clock that makes all be configured to TDM service restarts work;
Second kind,, make the self-adaptation clock of abnormal state restart work by the realization recovery operation that resets of the self-adaptation clock to the TDM service of appointment.
In order to solve the problems of the technologies described above, the invention provides self-adaptation clock processing unit in a kind of Packet Transport Network, comprise interconnective TDM business clock monitoring module and clock recovery module, wherein:
TDM business clock monitoring module is used for the self-adaptation clock that is configured to TDM service is monitored, and notifies clock recovery module when detecting the self-adaptation clock of abnormal state;
Clock recovery module is used for according to the notice of TDM business clock monitoring module self-adaptation clock being carried out recovery operation.
Further,
TDM business clock monitoring module periodically poll all adopt the TDM service of self-adaptation clocks, after self-adaptation clock is finished normal locking, TDM service is received buffering area accordingly whether overflows and detect; When detecting when receiving number of times that buffering area overflows continuously and exceeding threshold, judge the abnormal state of corresponding self-adaptation clock; Wherein, receive overflowing of buffering area and comprise overflow or underflow.
Further,
Clock recovery module is notified according to this, resets by the self-adaptation clock that all is configured to TDM service and realizes described recovery operation, and the self-adaptation clock that makes all be configured to TDM service restarts work.
Further,
The sign of the self-adaptation clock that TDM business clock monitoring module carrier state in notice is unusual;
Clock recovery module is according to the sign of self-adaptation clock of the abnormal state in this notice, specifies the realization recovery operation that resets of corresponding self-adaptation clock, makes the self-adaptation clock of abnormal state restart work.
Self-adaptation clock processing method and device among the PTN provided by the invention, can be by initiatively monitoring the self-adaptation clock of TDM business, find that rapidly the clock that causes unusually because of network is unusual, in time recover with the self-adaptation clock that will be in unusual TDM business, thereby make professional real the recovery normally of TDM.
Description of drawings
Fig. 1 is a self-adaptation clock processing method embodiment flow chart in the Packet Transport Network of the present invention;
Fig. 2 is the flow chart of monitoring TDM service adaptation clock embodiment among the method embodiment shown in Fig. 1;
Fig. 3 is the structured flowchart of self-adaptation clock processing unit in the Packet Transport Network of the present invention.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment technical scheme of the present invention is at length set forth.The real-time example that below exemplifies only is used for description and interpretation the present invention, and does not constitute technical solution of the present invention in restriction.
Self-adaptation clock processing method embodiment in the Packet Transport Network provided by the invention, its flow process comprises step as shown in Figure 1:
11: the self-adaptation clock clock that is configured to the TDM business is monitored;
At this, can just whether normally monitor at set intervals the self-adaptation clock clock of TDM business.Optimal way is periodically the self-adaptation clock clock of TDM business to be monitored.
12: when detecting unusual self-adaptation clock, carry out the clock recovery operation.
Because the receiving terminal of PTN can be temporarily stored into this business datum in the buffering area (Buffer) pending when receiving the TDM business datum.Usually, at the self-adaptation clock of TDM business just often, be buffering area can not occur to overflow (comprising overflow or underflow) situation; And occur to cause overflowing of buffering area when unusual at the self-adaptation clock of TDM business.Therefore, can whether in a period of time, occur continuously overflowing and judge whether corresponding self-adaptation clock occurs unusually by detecting buffering area at this.
At this, the clock recovery operation can realize by dual mode:
A kind of is that self-adaptation clock is carried out resetting of overall importancely, just with the self-adaptation clock channel reset of all TDM business configuration links, makes the self-adaptation clock of all links handle recovery, restarts work.
Another kind is to the resetting locally of self-adaptation clock, just only to the self-adaptation clock channel reset of the link of appointment, makes unusual adaptive clock recovery to occur, restarts work.
Because the self-adaptation clock of every TDM service link all is individual processing; May have only the self-adaptation clock passage of a certain link to occur unusually,, only need carry out reset operation to the self-adaptation clock that unusual link occurs and get final product in order not influence other link.
Monitoring TDM service adaptation clock embodiment among the method embodiment shown in Fig. 1, its flow process as shown in Figure 2, it is the operation of then carrying out in the preset monitoring time, comprises the steps:
111: judging whether all business on the equipment of traversing, is then to finish to monitor flow process, otherwise carries out the following step;
112: whether the business of judging configuration is the TDM business, is then to carry out the following step, carries out otherwise return step 111;
113: judge whether this business clock is self-adaptation clock, is then to carry out the following step, carry out otherwise return step 111;
114: judge whether the corresponding buffering area that receives overflows, and is then to carry out the following step, carries out otherwise return step 111;
Owing to after self-adaptation clock is unusual, must cause receiving buffer overflow or underflow, so can judge whether self-adaptation clock is unusual according to the overflow or the underflow situation of buffering area.
Because in the process of the normal locking of self-adaptation clock, buffering area also underflow can occur.Have only after the normal locking of self-adaptation clock and the underflow situation just can not occur.Therefore when business configuration is finished after, self-adaptation clock generally can locking within N minute, so can if this moment, buffering area also had the underflow situation of going up, can think that then self-adaptation clock occurs unusually detecting underflow situation on buffering area in N+M minute.
Because one-shot at most upward underflow in the locking process of self-adaptation clock under the normal condition, and just underflow can not appear again after the self-adaptation clock locking.Therefore, can judge according to the number of times of underflow on the self-adaptation clock whether self-adaptation clock is unusual.In order to shorten the self-adaptation clock anomaly detection time, can be by strengthening the monitoring frequency of self-adaptation clock, as once changing monitoring in 1 second into once by monitoring in original a minute.
115: judging that this reception buffering area overflows number of times+1 and whether transfinites, is execution in step 116 then, carries out otherwise return step 111;
Underflow is once gone up in every detection to corresponding reception buffering area, as long as underflow takes place to go up in this buffering area, just underflow number of times on this buffering area is added 1, so constantly self-adaptation clock is received buffering area accordingly and go up the underflow detection, if last underflow number of times is accumulated to the threshold that presets X time, judge that then unusual (such as the X empirical value can be 3, and promptly buffering area occurs going up for 3 times underflow continuously can to judge that self-adaptation clock occurs unusual) appears in self-adaptation clock work.Can greatly reduce the monitoring adaptive clock like this and the unusual time occur, reduce risk.
116: this professional self-adaptation clock that resets, and zero clearing clock buffering area overflows number of times; Returning step 111 carries out.
In a single day a certain TDM service link be judged self-adaptation clock and abnormal conditions occur, can carry out reset processing by a self-adaptation clock to this link, also can carry out reset processing to the self-adaptation clock of whole TDM service link.Preceding a kind of reset operation only resets to unusual self-adaptation clock occurring, so can not influence the TDM business of other link.
Can lock again the TDM business according to the self-adaptation clock processing method after self-adaptation clock resets, make that the TDM business recovery of respective link is normal.
In case carried out the self-adaptation clock reset operation, underflow number of times on the buffering area of this link is added up clear 0, the buffering area that restarts the monitoring adaptive clock overflows counting.
The present invention is directed to said method embodiment, self-adaptation clock processing unit embodiment in the Packet Transport Network correspondingly also be provided, its structure as shown in Figure 3, this device 300 comprises:
TDM business clock monitoring module 310 is used for the self-adaptation clock clock that is configured to the TDM business is monitored, and notifies clock recovery module 320 when detecting the self-adaptation clock of abnormal state;
At this, whether TDM business clock monitoring module 310 occurs continuously overflowing in a period of time and judges whether self-adaptation clock occurs unusually by periodically detecting the corresponding buffering area that receives.
At this, clock recovery module 320 resets the self-adaptation clock of all TDM business configuration links according to the notice of TDM business clock monitoring module 310 and realizes recovering, and perhaps only resets and realizes recovery unusual self-adaptation clock occurring according to the sign of the unusual self-adaptation clock of the appearance of carrying in this notice.
Technical scheme of the present invention is in time recovered by regularly every TDM service link being carried out the repeating query monitoring, can make unusual self-adaptation clock to occur; Because needed recovery time is relevant with the TDM that disposed business number, but this programme still can meet the demands, and makes the self-adaptation clock performance index reach requirement.
Certainly, when the professional number of the TDM that disposed reaches certain preestablished limit number, also the TDM traffic packets regularly can be carried out the poll monitoring to each group TDM business.Perhaps, occur under the situation of state labile, regularly only the self-adaptation clock of these state labiles is monitored at the self-adaptation clock of certain one or several TDM service link.
Perhaps, all being adopted self-adaptation clocks and type of service is that all business of TDM business are designated monitoring business in advance; At monitoring period at first, find monitored object rapidly according to this monitoring business sign, the step 111 of flow process then shown in Figure 2 can be simplified to 113, thereby makes monitoring period shorten effectively.
Concrete monitoring strategies can be determined according to concrete service conditions.
Claims (8)
1. self-adaptation clock processing method in the Packet Transport Network comprises:
State to the self-adaptation clock clock that is configured to TDM service is monitored; When the abnormal state of the self-adaptation clock that detects described TDM service, described self-adaptation clock is carried out recovery operation.
2. in accordance with the method for claim 1, it is characterized in that described state to the self-adaptation clock clock that is configured to TDM service is monitored, and specifically comprises:
Periodically poll all adopt the TDM service of described self-adaptation clock, after described self-adaptation clock is finished normal locking, described TDM service is received buffering area accordingly whether overflows and detect.
3. in accordance with the method for claim 2, it is characterized in that the described abnormal state that detects the self-adaptation clock of described TDM service specifically comprises:
When detecting number of times that described reception buffering area overflows continuously and exceed threshold, judge the abnormal state of corresponding self-adaptation clock; Wherein, overflowing of described reception buffering area comprises overflow or underflow.
4. according to each described method of claim 1 to 3, it is characterized in that, described self-adaptation clock is carried out recovery operation, specifically by any one realization in the following dual mode:
First kind, reset by the self-adaptation clock that all is configured to TDM service and to realize described recovery operation, make described all self-adaptation clocks that are configured to TDM service restart work;
Second kind, reset by self-adaptation clock and to realize described recovery operation the TDM service of appointment, make the self-adaptation clock of abnormal state restart work.
5. self-adaptation clock processing unit in the Packet Transport Network comprises interconnective TDM business clock monitoring module and clock recovery module, wherein:
Described TDM business clock monitoring module is used for the self-adaptation clock that is configured to TDM service is monitored, and notifies described clock recovery module when detecting the self-adaptation clock of abnormal state;
Described clock recovery module is used for according to the notice of described TDM business clock monitoring module described self-adaptation clock being carried out recovery operation.
6. according to the described device of claim 5, it is characterized in that,
Described TDM business clock monitoring module periodically poll all adopt the TDM service of described self-adaptation clock, after described self-adaptation clock is finished normal locking, described TDM service is received buffering area accordingly whether overflows and detect; When detecting number of times that described reception buffering area overflows continuously and exceed threshold, judge the abnormal state of corresponding self-adaptation clock; Wherein, overflowing of described reception buffering area comprises overflow or underflow.
7. according to claim 5 or 6 described devices, it is characterized in that,
Described clock recovery module is according to described notice, resets by the self-adaptation clock that all is configured to TDM service and realizes described recovery operation, makes described all self-adaptation clocks that are configured to TDM service restart work.
8. according to claim 5 or 6 described devices, it is characterized in that,
Described TDM business clock monitoring module carries the sign of the self-adaptation clock of described abnormal state in described notice;
Described clock recovery module is specified corresponding self-adaptation clock to reset and is realized described recovery operation according to the sign of the self-adaptation clock of the described abnormal state in the described notice, makes the self-adaptation clock of described abnormal state restart work.
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| WO2013023538A1 (en) * | 2011-08-17 | 2013-02-21 | 中兴通讯股份有限公司 | Synchronization network clock maintenance method and device |
| WO2015117387A1 (en) * | 2014-07-23 | 2015-08-13 | 中兴通讯股份有限公司 | Method and device for switching multi-link master clock, and ptn device |
| CN105847049A (en) * | 2016-03-22 | 2016-08-10 | 飞亚达（集团）股份有限公司 | Local area time synchronization system and monitoring method thereof |
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| CN1909441A (en) * | 2005-08-03 | 2007-02-07 | 阿尔特拉公司 | Wide range and dynamically reconfigurable clock data recovery architecture |
| CN101640578A (en) * | 2009-08-25 | 2010-02-03 | 北京邮电大学 | TDM service clock recovery method for packet transport network |
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| CN1909441A (en) * | 2005-08-03 | 2007-02-07 | 阿尔特拉公司 | Wide range and dynamically reconfigurable clock data recovery architecture |
| CN101640578A (en) * | 2009-08-25 | 2010-02-03 | 北京邮电大学 | TDM service clock recovery method for packet transport network |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013023538A1 (en) * | 2011-08-17 | 2013-02-21 | 中兴通讯股份有限公司 | Synchronization network clock maintenance method and device |
| CN102957545A (en) * | 2011-08-17 | 2013-03-06 | 中兴通讯股份有限公司 | Method and device for maintaining synchronous network clocks |
| CN102957545B (en) * | 2011-08-17 | 2017-12-05 | 中兴通讯股份有限公司 | The maintaining method and device of synchronous network clock |
| WO2015117387A1 (en) * | 2014-07-23 | 2015-08-13 | 中兴通讯股份有限公司 | Method and device for switching multi-link master clock, and ptn device |
| CN105306188A (en) * | 2014-07-23 | 2016-02-03 | 中兴通讯股份有限公司 | Multilink master clock switching method, device and PTN equipment |
| CN105847049A (en) * | 2016-03-22 | 2016-08-10 | 飞亚达（集团）股份有限公司 | Local area time synchronization system and monitoring method thereof |
| CN105847049B (en) * | 2016-03-22 | 2019-07-09 | 飞亚达（集团）股份有限公司 | A kind of local area time synchronization system and its monitoring method |
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Application publication date: 20110223 |