CN103684727A - Time synchronization method and device of optical transport network asynchronous network - Google Patents
Time synchronization method and device of optical transport network asynchronous network Download PDFInfo
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Abstract
The invention discloses a time synchronization method and a time synchronization device of an optical transport network asynchronous network. When a site in an optical transport network receives a time message transmitted by other sites, a first line card in the site recovers clock frequencies of one or a plurality of clock optical path data units(ODUm), wherein m is positive integers which are less than or equal to k, k is an optical path data unit order, and k is equal to 1, 2, 3 and 4, the service of the first line card uses a local clock to be converted to a data frame format of a back plate, the clock ODUm is sent to a second line card in the site through a cross board; the second line card uses the local clock to receive data frames of the back plate and restore the clock frequency of the clock ODUm, and the local clock or a service restoring clock of an optical path transmitting unit (OTUn) optical port is used to send the whole OTUn, wherein n is the order of the optical path transmitting unit. By adopting the time synchronization method and the time synchronization device of the optical transport network asynchronous network disclosed by the invention, the high-precision time synchronization can be supported under the condition that the present optical transport network OTN is asynchronous.
Description
Technical field
The present invention relates to the Time synchronization technique of communication field, relate in particular to a kind of method for synchronizing time and device of optical transfer network asynchronous network.
Background technology
Development along with Packet Service, PTN (Packet Transport Network, Packet Transport Network) day by day rise, it is applicable multiple services carrying not only, the function of clock synchronous (synchronous ethernet) and 1588 time synchronized more can be provided, can well support the characteristic of mobile retransmission (backhaul).But the business after PTN equipment converges, if transmitted through existing OTN (Optical Transport Network, optical transport network), needs to consider that OTN is for the bearing mode of time synchronized.
The support that OTN transmitted for the time of PTN at present, mainly contains three kinds of modes below:
1, client signal transmits 1588 agreements at OTN;
2, the OSC (Optical Supervisory Channel, Optical Supervisory Channel) by OTN transmits 1588 messages, at each OA and OTN node processing 1588 messages;
3, by the expense of light path data cell ODUk or light path delivery unit OTUk (wherein k is light path data cell exponent number, k=1,2,3), transmit 1588 messages.
Wherein, above-mentioned first kind of way, due to functions such as the mapping/demapping existing in OTN equipment, multiplex/demultiplex and exchanges, can sharply decline time synchronized performance; The second way is owing to 1588 messages of OSC termination again need to being initiated on other OSC passage, and existing device hardware framework possibly cannot be supported, and the OSC of each manufacturer may be compatible; The third mode is because OTN is asynchronous system, the transmission frequency of each port may be free-running system clock (regeneration business), also may be business recovery clock (transparent transmission service), and the relevant back plate design of existing network OTN equipment may not supported the synchronous etc. of timestamp between each business board, therefore on the OTN of existing network equipment, possibly cannot realize time synchronized by transformation.
In sum, if the OTN device systems framework of existing network cannot be changed, each website maximum clock frequency deviation 20ppm (microsecond), in this case, cannot realize exact time synchronization.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of method for synchronizing time and device of optical transfer network asynchronous network, in the situation that existing network OTN is asynchronous, supports precise synchronization.
For solving the problems of the technologies described above, the invention provides a kind of method for synchronizing time of optical transfer network asynchronous network, when the website in optical transport network (OTN) receives the time message of other websites transmission;
The first line card in described website recovers the clock frequency of one or more clock light path data cell (ODUm), wherein m is the positive integer that is less than or equal to k, k is light path data cell exponent number, k=1,2,3,4, the business of described the first line card is used local clock to be converted to the data frame format of backboard, by cross board, described clock ODUm is sent to the second line card in described website;
Described the second line card is used local clock to receive backboard Frame, recover the clock frequency of described clock ODUm, and use local clock or the business recovery clock of light path transmission unit (OTUn) light mouth to send whole OTUn, wherein n is the exponent number of light path transmission unit.
In addition,, when described OTN network and PTN equipment and P-OTN equipment network interworking, described time message comprises before transmitting in described OTN network:
Described PTN equipment obtains 1588 messages and is sent to described P-OTN equipment;
Described P-OTN equipment selects 1588 messages that a road receives to recover the time, as the system time of equipment, all 1588 messages that receive is encapsulated in described OTN network and carries out transparent transmission simultaneously.
In addition, described method also comprises:
When there is repetition in OTN time synchronized path, described the first line card, from the multiplexing OTUk of the high-order of reception, selects to recover a road ODUm clock.
In addition,, when n=m, described the second line card is used business recovery clock to send whole OTUn; Otherwise described the second line card is used local clock to send whole OTUn.
In addition, described method also comprises:
The P-OTN website that enters described OTN network in described time message is stamped 1588 and is entered time stamp, and the P-OTN website that goes out described OTN network in described time message is stamped out time stamp.
The present invention also provides a kind of time synchronism apparatus of optical transfer network asynchronous network, and described device comprises: the first line card and the second line card;
Described the first line card is used for, while receiving the time message of other websites transmission in optical transport network, recover the clock frequency of one or more clock ODUm, and use local clock to be converted to the data frame format of backboard the business of this line card, by cross board, described clock ODUm is sent to described the second line card; Wherein m is the positive integer that is less than or equal to k, and k is light path data cell exponent number, k=1, and 2,3,4,
Described the second line card is used for, and uses local clock to receive backboard Frame, recovers the clock frequency of described clock ODUm, and uses the local clock of OTUn light mouth or business recovery clock to send whole OTUn, and wherein n is the exponent number of light path transmission unit.
In addition, described the first line card is used for, and when there is repetition in OTN time synchronized path,, from the multiplexing OTUk of the high-order of reception, selects to recover a road ODUm clock.
In addition, described the first line card, further comprises: first interface unit, decapsulation unit, the first data and clock converting unit;
Described first interface unit is used for, and realizes opto-electronic conversion, and goes here and there and change;
Described decapsulation unit is used for, the obtaining of the expense of OTUk, and recover clock frequency from ODUm data;
Described the first data and clock converting unit are used for, the data frame format that is backboard by the data encapsulation of needs exchange, and be switched to backboard clock zone.
In addition, described the second line card, further comprises: the second interface unit, encapsulation unit, the second data and clock converting unit,
Described the second interface unit is used for, and realizes opto-electronic conversion, and goes here and there and change;
Described encapsulation unit is used for, and carries out the encapsulation process of the expense of OTUk, and recovers clock frequency from ODUm data;
Described the second data and clock converting unit are used for, and the data frame format that backboard is received transfers traffic frame form to, and is switched to business clock territory.
In sum, the veneer that the present invention transmitted by the development support time, replaces the corresponding veneer on each equipment in time bang path, realizes in the situation that the OTN equipment of existing network exists frequency departure, supports precise synchronization.
Compared with prior art, the present invention can support the business board of time synchronized in the situation that not changing existing network OTN equipment system by design, replace the veneer on time synchronized path on existing equipment, realizes the high-precise synchronization of time.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is OTN network and time synchronized configuration schematic diagram in the embodiment of the present invention;
Fig. 2 is OTN device interior time synchronized schematic diagram in the embodiment of the present invention;
Fig. 3 is the division schematic diagram of time-domain in the embodiment of the present invention;
Fig. 4 is the time synchronized schematic diagram of the adjacent interface of network in the embodiment of the present invention;
Fig. 5 is the time synchronized schematic diagram of embodiment of the present invention dorsulum both sides;
Fig. 6 supports time synchronized veneer to realize the schematic diagram of time synchronized by change in the embodiment of the present invention;
Fig. 7 is the time synchronism apparatus schematic diagram of optical transfer network asynchronous network in the embodiment of the present invention.
Embodiment
For the ease of setting forth the present invention, below with reference to drawings and the specific embodiments, the enforcement of technical solution of the present invention is described in further detail.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
As shown in Figure 1, use PTN, P-OTN (grouping optical transport network) and OTN equipment network interworking, wherein P-OTN equipment possesses synchronous EEC (Ethernet Equipment Clock, ether equipment clock) clock synchronous function, website 3-7 in Fig. 1 is existing OTN network, and each OTN website clock is in free oscillation.In figure, solid line represents existing business configuration, and dotted line represents time synchronized path, and interface is OTUk (k=1,2,3 or 4).The PTN equipment of supposing at 1 can obtain network clocking and time, (mode of OC+TC is a type of 1588V2 agreement official hour synchronizer to the mode of 2 employing OC+TC, for common transmission clock), 1588 messages of selecting a road to receive, recover the time, as the system time of equipment; All 1588 messages that receive are encapsulated into simultaneously and in OTN, carry out transparent transmission.
OTN network internal supports the veneer of time synchronized to carry out time synchronized by use, this veneer has following function: at circuit, receive and sending direction, all can recover the clock of a road (or multichannel) ODUm (m <=k), utilize local zone time of this clock generating, and utilize 1588 agreements to carry out time synchronized.
The time synchronized function of website 3 and website 5 of take is below example, and the time synchronized of the embodiment of the present invention is elaborated.
The line card OTUn Zhong Mou road ODUm (m <=n) of website 3 comes from the PTN network insertion of website 2, by circuit, recovers its clock clk2 (node3).Equally, first line card (linecard1) of website 5 is upper, also can recover the clock frequency clk0 (node 5) of this road ODUm.The service needed of Linecard1 is used local clock local_clk1, be transformed into the data format of backboard, then (what wherein give cross board is the business datum that need to be crossed to other light mouths of equipment of coming in from Guang Kou to give cross board, these data need to be encapsulated as and realize the needed specific frame structure of intersection), cross board exchanges to the second line card (linecard2) by ODUm.At linecard2, use local_clk1 to receive backboard data, also can recover the clock frequency clk2 (node5) of ODUm, use tx reference clock (the business tranmitting data register that refers to OTUn light mouth simultaneously, it can be clock local on veneer, also can be the OTUn clock recovering in business) (wherein n is the exponent number of light path transmission unit to send whole OTUn, when transparent transmission service, n=m, at this moment tx reference clock is clk2).Therefore clk2 (node 3), clk0 (node 5) and clk2 (node 5) are identical clock frequencies, all from the PTN network equipment clock of website 2.
For ease of describing, whole time-domain in Fig. 2 is divided, as shown in Figure 3, the time that clk2 (node 3) is corresponding is time0, the time that clk0 (node 5) is corresponding is time1, time corresponding to local_clk1 of linecard1 is time2, and time corresponding to local_clk1 of linecard2 is time3, and the time that clk2 (node 5) is corresponding is time4.The target of time synchronized is to make time4=time0.
Due to the both sides of the line interface at website 3 and website 5, the frequency of clk2 (node 3) and clk0 (node 5) equates, therefore can use 1588 agreements, utilize the expense of ODUk, realize mutual time synchronized, as shown in Figure 4, time0 and time1 realize synchronous.
Equally, because time2 and time3 are produced by local_clk1, if the round trip delay time of transposition circuit is symmetrical, can use 1588 agreements, realize the time synchronized before and after intersecting; If but the round-trip delay of transposition circuit is asymmetric relatively fixedly time, can be by the asymmetric numerical value of each crossedpath of test, the time is revised.As shown in Figure 5, realize the time synchronized of time2 and time3.
Finally, for time1 being passed to the time4 of another piece business board, can adopt following method: at linecard1, receive after OTUk frame or multi-frame, retrieve after frame head, record time1 and time2 now, then time2-time1 is placed in the reserve bytes of ODUm business or the reserve bytes of backboard signal format, by intersecting, passes to linecard2.Because the clock frequency of time1 and time4 is consistent, the time synchronized of time2 and time3, so therefore time3-time4=time2-time1 can derive time4.In this process, because time2-time1 is delivered to the free time delay of linecard2 from linecard1, can cause certain influence to the precision of time4.Analyze its impact as follows: suppose that clk0 (node 5) and the clock frequency of local_clk1 differ 20ppm, because the greatest frame period of OTUk is for when the k=1, T=48.971us., from linecard1 from recording time2-time1, to this numerical value is passed to linecard2, the time of cost is assumed to the cycle of 2 OTUk, and error, for being less than 2 ns, can be accepted, and thinks that time4 can be synchronous with time0.
By said process, can find out: line card 1 recovers Mou road ODUm clock from light mouth to cross board direction, line card 2 recovers Mou road ODUm clock from cross board to light mouth direction; And, the time-domain that line card inside marks off by different clocks, thus carry out the time transmission in different time territory, and the time of realizing website 3 passes to website 5.
Similarly, website 5 also can hand on time4, and last website 8 and website 9 are by recovering the time of website 2, and as the system time of whole equipment, the time of whole like this OTN network just can realize synchronously.
Wherein, 1588 messages are when entering OTN network, at P-OTN website, stamp the timestamp into time stamp ingress, then at the P-OTN website that goes out OTN network, stamp out time stamp egress timestamp, so just can realize the transparent clock of whole OTN network.For example at website 2, stamp into time stamp, at website 8 and website 9, stamp out time stamp.
Be illustrated in figure 6 the time transmission that realizes OTN asynchronous network in the embodiment of the present invention, will the time pass to PTNA, the schematic diagram of PTNB and PTNC network.Wherein suppose all energy acquisition time messages of PTN network element 1 and network element 12, thereby recover the time, and the time all in required precision scope and so on, can be planned so the time of network element 1 is passed to PTN A and PTN B network, the time of network element 12 is passed to PTN C network.
By employing, support the veneer of time synchronized function, replace original veneer in synchronous path, just can realize time synchronized function.If the access device of whole OTN network is synchronous network device.For example, during PTN (supporting that synchronous ether is synchronous), or SDH (SDH (Synchronous Digital Hierarchy)), the synchronised clock that the speed of its OTN interface is equipment.Now, when there is repetition in OTN time synchronized path, in the multiplexing OTUk of high-order that line side receives, only need to recover a road ODUm clock, to its time synchronized.For example, in Fig. 6, the business of website 13 and website 3, after high-order is multiplexing, passes to website 7 through website 5, a recovered clock in the circuit reception of website 7 only need to be selected website 3 or website 13.
In addition, also provide a kind of time synchronism apparatus of optical transfer network asynchronous network in the embodiment of the present invention, this device mainly comprises the first line card and the second line card, wherein:
Described the first line card is used for, while receiving the time message of other websites transmission in optical transport network, recover the clock frequency of one or more clock ODUm, and use local clock to be converted to the data frame format of backboard the business of this line card, by cross board, described clock ODUm is sent to described the second line card; Wherein m is the positive integer that is less than or equal to k, and k is light path data cell exponent number, k=1, and 2,3,4,
Described the second line card is used for, and uses local clock to receive backboard Frame, recovers the clock frequency of described clock ODUm, and uses the local clock of OTUn light mouth or business recovery clock to send whole OTUn, and wherein n is the exponent number of light path transmission unit.
Wherein, described the first line card is used for, and when there is repetition in OTN time synchronized path,, from the multiplexing OTUk of the high-order of reception, selects to recover a road ODUm clock.
In addition, described the first line card, further comprises: first interface unit, decapsulation unit, the first data and clock converting unit;
Described first interface unit is used for, and realizes opto-electronic conversion, and goes here and there and change;
Described decapsulation unit is used for, the obtaining of the expense of OTUk, and recover clock frequency from ODUm data;
Described the first data and clock converting unit are used for, the data frame format that is backboard by the data encapsulation of needs exchange, and be switched to backboard clock zone.
In addition, described the second line card, further comprises: the second interface unit, encapsulation unit, the second data and clock converting unit,
Described the second interface unit is used for, and realizes opto-electronic conversion, and goes here and there and change;
Described encapsulation unit is used for, and carries out the encapsulation process of the expense of OTUk, and recovers clock frequency from ODUm data;
Described the second data and clock converting unit are used for, and the data frame format that backboard is received transfers traffic frame form to, and is switched to business clock territory.
Wherein, according to different application demands, the first described line card and the second line card, can be line card independently, also the function of the two can be integrated among same bracing cable card.
These are only preferred case study on implementation of the present invention; be not limited to the present invention; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (9)
1. a method for synchronizing time for optical transfer network asynchronous network, is characterized in that, when the website in optical transport network (OTN) receives the time message of other websites transmission;
The first line card in described website recovers the clock frequency of one or more clock light path data cell (ODUm), wherein m is the positive integer that is less than or equal to k, k is light path data cell exponent number, k=1,2,3,4, the business of described the first line card is used local clock to be converted to the data frame format of backboard, by cross board, described clock ODUm is sent to the second line card in described website;
Described the second line card is used local clock to receive backboard Frame, recover the clock frequency of described clock ODUm, and use local clock or the business recovery clock of light path transmission unit (OTUn) light mouth to send whole OTUn, wherein n is the exponent number of light path transmission unit.
2. the method for claim 1, is characterized in that, when described OTN network and PTN equipment and P-OTN equipment network interworking, described time message comprises before transmitting in described OTN network:
Described PTN equipment obtains 1588 messages and is sent to described P-OTN equipment;
Described P-OTN equipment selects 1588 messages that a road receives to recover the time, as the system time of equipment, all 1588 messages that receive is encapsulated in described OTN network and carries out transparent transmission simultaneously.
3. method as claimed in claim 1 or 2, is characterized in that, described method also comprises:
When there is repetition in OTN time synchronized path, described the first line card, from the multiplexing OTUk of the high-order of reception, selects to recover a road ODUm clock.
4. the method for claim 1, is characterized in that,
When n=m, described the second line card is used business recovery clock to send whole OTUn; Otherwise described the second line card is used local clock to send whole OTUn.
5. the method for claim 1, is characterized in that, described method also comprises:
The P-OTN website that enters described OTN network in described time message is stamped 1588 and is entered time stamp, and the P-OTN website that goes out described OTN network in described time message is stamped out time stamp.
6. a time synchronism apparatus for optical transfer network asynchronous network, is characterized in that, described device comprises: the first line card and the second line card;
Described the first line card is used for, while receiving the time message of other websites transmission in optical transport network, recover the clock frequency of one or more clock ODUm, and use local clock to be converted to the data frame format of backboard the business of this line card, by cross board, described clock ODUm is sent to described the second line card; Wherein m is the positive integer that is less than or equal to k, and k is light path data cell exponent number, k=1, and 2,3,4,
Described the second line card is used for, and uses local clock to receive backboard Frame, recovers the clock frequency of described clock ODUm, and uses the local clock of OTUn light mouth or business recovery clock to send whole OTUn, and wherein n is the exponent number of light path transmission unit.
7. device as claimed in claim 6, is characterized in that,
Described the first line card is used for, and when there is repetition in OTN time synchronized path,, from the multiplexing OTUk of the high-order of reception, selects to recover a road ODUm clock.
8. device as claimed in claim 6, is characterized in that,
Described the first line card, further comprises: first interface unit, decapsulation unit, the first data and clock converting unit;
Described first interface unit is used for, and realizes opto-electronic conversion, and goes here and there and change;
Described decapsulation unit is used for, the obtaining of the expense of OTUk, and recover clock frequency from ODUm data;
Described the first data and clock converting unit are used for, the data frame format that is backboard by the data encapsulation of needs exchange, and be switched to backboard clock zone.
9. the device as described in claim 6,7 or 8, is characterized in that,
Described the second line card, further comprises: the second interface unit, encapsulation unit, the second data and clock converting unit,
Described the second interface unit is used for, and realizes opto-electronic conversion, and goes here and there and change;
Described encapsulation unit is used for, and carries out the encapsulation process of the expense of OTUk, and recovers clock frequency from ODUm data;
Described the second data and clock converting unit are used for, and the data frame format that backboard is received transfers traffic frame form to, and is switched to business clock territory.
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