CN102655437A - Difference clock recovery method and device - Google Patents
Difference clock recovery method and device Download PDFInfo
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- CN102655437A CN102655437A CN2011100513795A CN201110051379A CN102655437A CN 102655437 A CN102655437 A CN 102655437A CN 2011100513795 A CN2011100513795 A CN 2011100513795A CN 201110051379 A CN201110051379 A CN 201110051379A CN 102655437 A CN102655437 A CN 102655437A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
- H04J3/0632—Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES]
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a difference clock recovery method and a difference clock recovery device. The method comprises the following steps of: arranging a timing period used for providing a reference for all network equipment, calculating the gross information content of a CBR (constant bit rate) business when sending end network equipment receives the CBR business with a fixed code rate; and carrying out clock recovery on the receiving end network equipment according to the gross information content of the CBR business. The technical scheme provided by the invention solves the problem that the conventional difference clock recovery method causes intercommunication difficulty because of network equipment clock frequency point discordance, so that the effects of ignoring a clock frequency point and recovering a clock simply and reliably can be realized.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of differential clocks restoration methods and device.
Background technology
CBR (Constants Bit Rate, cbr (constant bit rate)) is professional to have obtained number of applications in traditional network based on time division multiplex system, and its time-delay, and characteristics such as shake and drift can both be effectively guaranteed.But traditional network based on time division multiplex system is lower for the transmission efficiency of grouping message, and the IPization of network is more and more obvious, in order to simplify network, must face the professional problem of CBR that how in packet network, to transmit.
The professional transmission of CBR all need recover the professional clock of CBR at receiving terminal, at present standard definition three kinds of clock recovery modes, timing mode, differential clocks pattern and self-adaptation clock pattern again.At present; The canonical algorithm that differential clocks recovers has two kinds, the differential clocks algorithm of a kind of ATM (Asynchronous Transfer Mode, asynchronous transfer mode) tissue definition; Another one is RTP (Real-time Transport Protocol; Real time transport protocol) the differential clocks algorithm of protocol definition, these two canonical algorithms, its basic principle all is the clock periodicity between transport service clock and the equipment work clock.But in the network of reality, the frequency of the clock frequency that different manufacturers adopts is inconsistent, and therefore in interconnected, the frequency that need pass through two distinct devices of configuration is consistent, could guarantee intercommunication, and this has brought very big difficulty to Network Management and maintenance.And producer adopts the system of which type of frequency design oneself, generally all belongs to the scope of technical know-how, and producer is unwilling to reveal these information, and the people is the difficulty that has caused intercommunication.
Summary of the invention
Main purpose of the present invention is to provide a kind of differential clocks restoration methods and device, one of to address the above problem at least.
According to an aspect of the present invention, a kind of differential clocks restoration methods is provided, has comprised: a timing cycle that supplies the reference of all-network equipment has been set; The transmitting terminal network equipment is added up the professional gross information content of this CBR and is sent to the receiving terminal network equipment when receiving cbr (constant bit rate) CBR business; The receiving terminal network equipment carries out clock recovery according to this CBR professional gross information content and above-mentioned timing cycle.
According to a further aspect in the invention, a kind of differential clocks recovery device is provided, comprising: the cycle is provided with module, is used to be provided with a timing cycle that supplies the reference of all-network equipment; The statistics sending module is used for when receiving cbr (constant bit rate) CBR business, adds up the professional gross information content of this CBR and also sends; Clock recovery module is used to receive the professional gross information content of above-mentioned CBR, and carries out clock recovery according to this CBR professional gross information content and above-mentioned timing cycle.
Through the present invention, adopt the timing cycle of the standard that is provided with, supply the reference of all-network equipment; When transmission CBR is professional; The professional gross information content of statistics CBR according to the scheme that the gross information content and the relation between the timing cycle of CBR business are carried out clock recovery, has solved in the existing differential clocks restoration methods because the inconsistent problem that causes the intercommunication difficulty of network equipment clock frequency frequency; And then reached and ignored the clock frequency frequency, the effect of simple and reliable recovered clock.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the differential clocks restoration methods of the embodiment of the invention;
Fig. 2 is the structured flowchart according to the differential clocks recovery device of the embodiment of the invention;
Fig. 3 is the structured flowchart of differential clocks recovery device according to the preferred embodiment of the invention.
Embodiment
Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
Fig. 1 is the flow chart according to the differential clocks restoration methods of the embodiment of the invention.As shown in Figure 1, comprise according to the differential clocks restoration methods of the embodiment of the invention:
Step S102 is provided with a timing cycle that supplies the reference of all-network equipment;
Step S104, the transmitting terminal network equipment add up the professional gross information content of this CBR and send to the receiving terminal network equipment when receiving the CBR business;
Step S106, the receiving terminal network equipment carries out clock recovery according to this CBR professional gross information content and above-mentioned timing cycle.
Above-mentioned differential clocks restoration methods; Set (the confession all-network equipment reference of a standard timing cycle; Can produce according to work clock by the network equipment), and according to the professional gross information content of this timing cycle statistics CBR, through the professional gross information content of above-mentioned CBR and standard timing cycle indirect reflected business clock; Thereby the frequency of having ignored clock frequency has been eliminated the obstacle of network equipment intercommunication in the prior art.
Preferably, step S104 may further include following processing:
(1) the transmitting terminal network equipment is added up the professional amount of information of CBR that in each timing cycle, receives, and is confirmed the gross information content that this CBR is professional when receiving the CBR business;
(2) the transmitting terminal network equipment becomes the grouping message with the CBR service groups that receives, and the gross information content that this CBR is professional is carried in the above-mentioned grouping message and sends to the receiving terminal network equipment.
The transmitting terminal network equipment can be added up the professional amount of information of CBR that in each timing cycle, receives when receiving the CBR business; So; Before sending this CBR business with the form of grouping message; Just can determine the professional gross information content of this CBR, thereby obtain the foundation of recovered clock according to the number of the timing cycle of process.Because said method is applied in the packet network, so the transmitting terminal network equipment need be formed the grouping message with it and send when sending the CBR business, the professional gross information content of this CBR then can be carried in the grouping message and send together.Certainly, the receiving terminal network equipment not only can carry out clock recovery after receiving above-mentioned grouping message, also can further carry out data and recover.
Preferably, step S106 may further include following processing:
(1) confirms traffic frequencies according to CBR professional gross information content and timing cycle;
(2) confirm business clock according to above-mentioned traffic frequencies;
(3) confirm clock periodicity between business clock and the equipment work clock;
(4) carry out clock recovery according to the clock periodicity between business clock and the equipment work clock.
The receiving terminal network equipment is after the gross information content and timing cycle that have obtained the CBR business; Through a simple division arithmetic (gross information content/total time); Just can obtain professional accurate frequency information; And then just can draw business clock, thereby can finally obtain to carry out required business clock of differential clocks recovery and the clock periodicity between the equipment work clock.When carrying out clock recovery, the recovery algorithms of the clock of employing can be continued to use traditional SDH (Synchronous Digital Hierarchy, SDH) clock recovery algorithm, also can use the simple numerical frequency divider to realize.
Preferably, the professional gross information content of above-mentioned CBR may further include one of following:
The professional amount of information of CBR in all timing cycles between the grouping message that sent this grouping message and last time;
The amount of information of the interior CBR business of all timing cycles and the difference between the predetermined standard value between the grouping message that sent this grouping message and last time;
The professional amount of information of CBR in all timing cycles before this grouping message.
For the professional gross information content of CBR, multiple avatar can be arranged, include but not limited to above-mentioned three kinds of forms.First kind of form reflected between twice grouping message the professional amount of information of CBR in one or more timing cycles; Second kind of form reflects the amount of information that CBR is professional with the mode of difference, and predetermined standard value wherein also is different for different coding mode value.The third form adopts the mode that adds up to reflect the amount of information that CBR is professional.
Below in conjunction with instance above-mentioned preferred embodiment is described.Be the designate that titles such as the E1 that mentions in the instance, T1 are all pulse-code modulation method commonly used below.
Instance 1: to using E1/T1 commonly used; The regulation timing cycle is 500us; The grouping message of an E1/T1 of every transmission is just with the current group message and sent the E1/T1 information number of adding up in all timing cycles between the grouping message last time and be carried in this grouping message;
Instance 2: to using E3/T3 commonly used; The regulation timing cycle is 125us; The grouping message of an E3/T3 of every transmission is just with the current group message and sent the E3/T3 information number of adding up in all timing cycles between the grouping message last time and be carried in this grouping message;
Instance 3: to E4 commonly used, the regulation timing cycle is 125us, and the grouping message of an E4 of every transmission is just with the current group message and sent the E4 information number of adding up in all timing cycles between the grouping message last time and be carried in this grouping message;
Instance 4: to using E1/T1 commonly used; The regulation timing cycle is 500us; The grouping message of an E1/T1 of every transmission is just with the current group message and sent the E1/T1 information number and the difference between the standard value of adding up in all timing cycles between the grouping message last time and be carried in this grouping message; For E1, the standard value of every 500us is 256 bit; Standard value for the every 500us of T1 is 193 bit;
Instance 5: to using E3/T3 commonly used; The regulation timing cycle is 125us; The grouping message of an E3/T3 of every transmission is just with the current group message and sent the E3/T3 information number and the difference between the standard value of adding up in all timing cycles between the grouping message last time and be carried in this grouping message; For E3, the standard value of every 125us is 4296 bit; Standard value for the every 125us of T3 is 5592 bit;
Instance 6: to using E4 commonly used; The regulation timing cycle is 125us; The grouping message of an E4 of every transmission is just with the current group message and sent the E4 information number and the difference between the standard value of adding up in all timing cycles between the grouping message last time and be carried in this grouping message; For E4, the standard value of every 125us is 17408 bit;
Instance 7: to using E1/T1 commonly used, the regulation timing cycle is 500us, and the grouping message of an E1/T1 of every transmission just is carried to the statistical information number of all 500us in the cycle before the current group in this grouping message;
Instance 8: to using E3/T3 commonly used, the regulation timing cycle is 125us, and the grouping message of an E3/T3 of every transmission just is carried to the statistical information number of all 125us in the cycle before the current group in this grouping message;
Instance 9: to using E4 commonly used, the regulation timing cycle is 125us, and the grouping message of an E4 of every transmission just is carried to the statistical information number of all 125us in the cycle before the current group in this grouping message.
Fig. 2 is the structured flowchart according to the differential clocks recovery device of the embodiment of the invention.As shown in Figure 2, comprise according to the differential clocks recovery device of the embodiment of the invention:
Cycle is provided with module 22, is used to be provided with a timing cycle that supplies the reference of all-network equipment;
Said apparatus adopts the professional gross information content according to timing cycle statistics CBR, and the scheme of indirect reflection business clock has reached the frequency of ignoring clock frequency, eliminates the technique effect of the obstacle of network equipment intercommunication in the prior art.
Preferably, as shown in Figure 3, statistics sending module 24 may further include:
Difference information generation unit 242 is used for when receiving the CBR business, the amount of information that the CBR that statistics receives in each timing cycle is professional, and confirm the gross information content that this CBR is professional;
Grouping message generating unit 244 is used for the CBR service groups that receives is become the grouping message, and the gross information content that this CBR is professional is carried in the above-mentioned grouping message and sends.
Difference information generation unit 242 need be added up the professional amount of information of CBR that in each timing cycle, receives when receiving the CBR business; So; Before sending this CBR business with the form of grouping message; Just can determine the professional gross information content of this CBR, thereby obtain the foundation of recovered clock according to the number of the timing cycle of process.Because said apparatus is applied in the packet network; When sending the CBR business; Need become the grouping message to send the CBR service groups that receives by grouping message generating unit 244, the professional gross information content of this CBR then can be carried in the grouping message and send together.
Preferably, as shown in Figure 3, clock recovery module 26 may further include:
Business clock is confirmed unit 262, is used for confirming traffic frequencies based on CBR professional gross information content and timing cycle, and confirms business clock based on above-mentioned traffic frequencies;
Clock periodicity is confirmed unit 264, is used for confirming the clock periodicity between business clock and the equipment work clock;
Differential clocks recovery unit 266 is used for carrying out clock recovery according to the clock periodicity between business clock and the equipment work clock.
Preferably, the professional gross information content of above-mentioned CBR may further include one of following:
The professional amount of information of CBR in all timing cycles between the grouping message that sent this grouping message and last time;
The amount of information of the interior CBR business of all timing cycles and the difference between the predetermined standard value between the grouping message that sent this grouping message and last time;
The professional amount of information of CBR in all timing cycles before this grouping message.
For the professional gross information content of CBR, multiple avatar can be arranged, include but not limited to above-mentioned three kinds of forms.
From above description, can find out that the implication that technical scheme clock provided by the invention transmits is clear and definite, ignored the difference of distinct device clock frequency frequency, solved the intercommunication problem of differential clocks, simplified design, made things convenient for maintenance management.And when recovered clock, the recovery algorithms of the clock of employing can be continued to use traditional SDH clock recovery algorithm, also can use the simple numerical frequency divider to realize, algorithm is simple, reliable, integrated level is high, has reduced the cost of equipment.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a differential clocks restoration methods is characterized in that, comprising:
A timing cycle that supplies the reference of all-network equipment is set;
The transmitting terminal network equipment is added up the professional gross information content of said CBR and is sent to the receiving terminal network equipment when receiving cbr (constant bit rate) CBR business;
The said receiving terminal network equipment carries out clock recovery according to said CBR professional gross information content and said timing cycle.
2. method according to claim 1 is characterized in that, the said transmitting terminal network equipment is receiving cbr (constant bit rate) CBR when professional, adds up the professional amount of information of said CBR and send to the receiving terminal network equipment to comprise:
The said transmitting terminal network equipment is added up the professional amount of information of CBR that in each timing cycle, receives, and is confirmed the gross information content that said CBR is professional when receiving the CBR business;
The said CBR service groups that the said transmitting terminal network equipment will receive becomes the grouping message, and the gross information content that said CBR is professional is carried in the said grouping message and sends to the receiving terminal network equipment.
3. method according to claim 2 is characterized in that, the said receiving terminal network equipment carries out clock recovery according to the professional gross information content of said CBR and said timing cycle and comprises:
Gross information content and said timing cycle according to said CBR is professional are confirmed traffic frequencies;
Confirm business clock according to said traffic frequencies;
Confirm the clock periodicity between said business clock and the equipment work clock;
Clock periodicity according between said business clock and the equipment work clock carries out clock recovery.
4. method according to claim 3 is characterized in that, it is one of following that the professional gross information content of said CBR comprises:
The professional amount of information of CBR in all timing cycles between the grouping message that sent this grouping message and last time;
The amount of information of the interior CBR business of all timing cycles and the difference between the predetermined standard value between the grouping message that sent this grouping message and last time;
The professional amount of information of CBR in all timing cycles before this grouping message.
5. a differential clocks recovery device is characterized in that, comprising:
Cycle is provided with module, is used to be provided with a timing cycle that supplies the reference of all-network equipment;
The statistics sending module is used for when receiving cbr (constant bit rate) CBR business, adds up the professional gross information content of said CBR and also sends;
Clock recovery module is used to receive the professional gross information content of said CBR, and carries out clock recovery according to said CBR professional gross information content and said timing cycle.
6. device according to claim 5 is characterized in that, said statistics sending module comprises:
The difference information generation unit is used for when receiving the CBR business, the amount of information that the CBR that statistics receives in each timing cycle is professional, and confirm the gross information content that said CBR is professional;
Grouping message generating unit is used for the said CBR service groups that receives is become the grouping message, and the gross information content that said CBR is professional is carried in the said grouping message and sends.
7. device according to claim 6 is characterized in that, said clock recovery module comprises:
Business clock is confirmed the unit, is used for confirming traffic frequencies according to said CBR professional gross information content and said timing cycle, and confirms business clock according to said traffic frequencies;
Clock periodicity is confirmed the unit, is used for confirming the clock periodicity between said business clock and the equipment work clock;
The differential clocks recovery unit is used for carrying out clock recovery according to the clock periodicity between said business clock and the equipment work clock.
8. device according to claim 7 is characterized in that, it is one of following that the professional gross information content of said CBR comprises:
The professional amount of information of CBR in all timing cycles between the grouping message that sent this grouping message and last time;
The amount of information of the interior CBR business of all timing cycles and the difference between the predetermined standard value between the grouping message that sent this grouping message and last time;
The professional amount of information of CBR in all timing cycles before this grouping message.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110051379.5A CN102655437B (en) | 2011-03-03 | Difference clock recovery method and device | |
| PCT/CN2012/071429 WO2012116610A1 (en) | 2011-03-03 | 2012-02-22 | Differential clock recovery method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110051379.5A CN102655437B (en) | 2011-03-03 | Difference clock recovery method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102655437A true CN102655437A (en) | 2012-09-05 |
| CN102655437B CN102655437B (en) | 2016-12-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796211A (en) * | 2014-01-16 | 2015-07-22 | 中兴通讯股份有限公司 | Method, device and system for differential clock frequency adjusting, source end equipment, and interworking modifier |
| CN106664233A (en) * | 2014-11-11 | 2017-05-10 | 华为技术有限公司 | Method and apparatus for processing differential clock recovery |
| WO2024007804A1 (en) * | 2022-07-07 | 2024-01-11 | 中兴通讯股份有限公司 | Method and apparatus for recovering bit rate of constant bit rate signal |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1496072A (en) * | 2002-08-24 | 2004-05-12 | ���ֿ˰뵼������˾ | Self-adaptive clock restorer |
| CN1551556A (en) * | 2003-03-07 | 2004-12-01 | 卓联半导体有限公司 | Clock synchronisation over a packet network |
| CN1581844A (en) * | 2003-08-15 | 2005-02-16 | 上海贝尔阿尔卡特股份有限公司 | Packet switching network distributed adaptive dither buffer adjusting method |
| WO2008151989A2 (en) * | 2007-06-13 | 2008-12-18 | Thomson Licensing | System and method for transport of a constant bit rate stream |
| CN101341701A (en) * | 2005-12-19 | 2009-01-07 | 阿尔卡特朗讯公司 | Method of passing a constant bit rate digital signal through an Ethernet interface and system for carrying out the method |
| CN101686185A (en) * | 2008-09-23 | 2010-03-31 | 华为技术有限公司 | Method, device and system for transmitting TDM services in packet network |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1496072A (en) * | 2002-08-24 | 2004-05-12 | ���ֿ˰뵼������˾ | Self-adaptive clock restorer |
| CN1551556A (en) * | 2003-03-07 | 2004-12-01 | 卓联半导体有限公司 | Clock synchronisation over a packet network |
| CN1581844A (en) * | 2003-08-15 | 2005-02-16 | 上海贝尔阿尔卡特股份有限公司 | Packet switching network distributed adaptive dither buffer adjusting method |
| CN101341701A (en) * | 2005-12-19 | 2009-01-07 | 阿尔卡特朗讯公司 | Method of passing a constant bit rate digital signal through an Ethernet interface and system for carrying out the method |
| WO2008151989A2 (en) * | 2007-06-13 | 2008-12-18 | Thomson Licensing | System and method for transport of a constant bit rate stream |
| CN101686185A (en) * | 2008-09-23 | 2010-03-31 | 华为技术有限公司 | Method, device and system for transmitting TDM services in packet network |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796211A (en) * | 2014-01-16 | 2015-07-22 | 中兴通讯股份有限公司 | Method, device and system for differential clock frequency adjusting, source end equipment, and interworking modifier |
| CN104796211B (en) * | 2014-01-16 | 2019-01-08 | 中兴通讯股份有限公司 | Adjust differential clocks frequency approach, device, system and intercommunication modifier |
| CN106664233A (en) * | 2014-11-11 | 2017-05-10 | 华为技术有限公司 | Method and apparatus for processing differential clock recovery |
| WO2024007804A1 (en) * | 2022-07-07 | 2024-01-11 | 中兴通讯股份有限公司 | Method and apparatus for recovering bit rate of constant bit rate signal |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012116610A1 (en) | 2012-09-07 |
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