CN103684727B - A kind of method for synchronizing time and device of optical transfer network asynchronous network - Google Patents
A kind of method for synchronizing time and device of optical transfer network asynchronous network Download PDFInfo
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- CN103684727B CN103684727B CN201210316799.6A CN201210316799A CN103684727B CN 103684727 B CN103684727 B CN 103684727B CN 201210316799 A CN201210316799 A CN 201210316799A CN 103684727 B CN103684727 B CN 103684727B
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Abstract
The invention discloses a kind of method for synchronizing time and device of optical transfer network asynchronous network, when website in optical transport network receives the time message of other website transmission, the first line card in the website recovers the clock frequency of one or more clock light-path data cell (ODUm), wherein m is the positive integer less than or equal to k, k is light-path data cell exponent number, k=1,2,3,4, the business of first line card is converted to the data frame format of backboard using local clock, the second line card being sent to clock ODUm by cross board in website；Second line card receives backboard data frame using local clock, recover clock ODUm clock frequency, and whole OTUn is sent using the local clock or business recovery clock of light-path transmission unit (OTUn) optical port, wherein n is the exponent number of light-path transmission unit.Using the present invention, precise synchronization can be supported in the case where existing network OTN is asynchronous.
Description
Technical field
The present invention relates to the Time synchronization technique of communication field, more particularly to a kind of time of optical transfer network asynchronous network are same
One step process and device.
Background technology
With the development of Packet Service, PTN (Packet Transport Network, Packet Transport Network) is increasingly emerging
Rising, it is not only applicable multiple services carrying, can more provide the function of clock synchronous (synchronous ethernet) and 1588 time synchronizeds,
It can be very good the characteristic of support mobile retransmission (backhaul).But the business after PTN device converges, if by
Some OTN (Optical Transport Network, optical transport network) are transmitted, then need to consider that OTN is same for the time
The bearing mode of step.
Supports of the OTN for PTN Time Transmission at present, mainly there is following three mode：
1st, client signal transmits 1588 agreements in OTN；
2nd, 1588 messages are transmitted by OTN OSC (Optical Supervisory Channel, Optical Supervisory Channel),
Each message of OA and OTN node processings 1588；
3rd, by light-path data cell ODUk or light-path delivery unit OTUk, (wherein k is light-path data cell
Exponent number, k=1,2,3) expense transmits 1588 messages.
Wherein, above-mentioned first way due to mapping/demapping present in OTN equipment, multiplex/demultiplex and
The functions such as exchange so that time synchronized performance can drastically decline；The second way exists due to needing 1588 messages by OSC terminations
Initiated again on other OSC passages, existing device hardware framework possibly can not be supported, and the OSC of each manufacturer may nothing
Method is compatible；For the third mode because OTN is asynchronous system, the transmission frequency of each port may be the system clock of free oscillation
(regeneration business), it is also possible to be business recovery clock (transparent transmission service), and existing network OTN equipment correlation back plate designs may not be supported
Synchronization of timestamp etc. between each business board, therefore possibly time synchronized can not be realized by transformation in the OTN equipment of existing network.
In summary, if the OTN device systems framework of existing network can not be changed, each website maximum clock frequency deviation
20ppm (microsecond), in this case, exact time synchronization can not be realized.
The content of the invention
Present invention solves the technical problem that it is to provide a kind of method for synchronizing time and device of optical transfer network asynchronous network,
In the case that existing network OTN is asynchronous, precise synchronization is supported.
In order to solve the above technical problems, the invention provides a kind of method for synchronizing time of optical transfer network asynchronous network, light
When website in transmission network (OTN) receives the time message of other website transmission；
The first line card in the website recovers the clock frequency of one or more clock light-path data cell (ODUm)
Rate, wherein m are positive integer less than or equal to k, and k is light-path data cell exponent number, k=1,2,3,4, first line card
Business is converted to the data frame format of backboard using local clock, and the clock ODUm is sent into the website by cross board
In the second line card；
Second line card receives backboard data frame using local clock, recovers the clock frequency of the clock ODUm,
And send whole OTUn, wherein n using the local clock or business recovery clock of light-path transmission unit (OTUn) optical port
For the exponent number of light-path transmission unit.
In addition, when the OTN networks are with PTN device and P-OTN equipment network interworkings, the time message is in the OTN
Before being transmitted in network, including：
The PTN device obtains 1588 messages and sent to the P-OTN equipment；
1588 messages that P-OTN equipment selection receives all the way recover the time, as the system time of equipment, together
When all 1588 messages received be encapsulated into the OTN networks carry out transparent transmission.
In addition, methods described also includes：
When there is repetition in OTN time synchronizeds path, then in the OTUk that first line card is multiplexed from the high-order of reception, selection
Recover ODUm clocks all the way.
In addition, as n=m, second line card sends whole OTUn using business recovery clock；Otherwise, described
Two line cards send whole OTUn using local clock.
In addition, methods described also includes：
1588 are stamped into the P-OTN websites of the OTN networks in the time message and enter time stamp, in the time message
The P-OTN websites for going out the OTN networks stamp out time stamp.
Present invention also offers a kind of time synchronism apparatus of optical transfer network asynchronous network, described device includes：First Line
Card and the second line card；
First line card is used for, and when receiving the time message that other websites in optical transport network transmit, recovers
One or more clock ODUm clock frequency, and the business of this line card is converted to the data frame lattice of backboard using local clock
Formula, the clock ODUm is sent to by second line card by cross board；Wherein m is the positive integer less than or equal to k, and k is
Light-path data cell exponent number, k=1,2,3,4,
Second line card is used for, and receives backboard data frame using local clock, recovers the clock of the clock ODUm
Frequency, and whole OTUn is sent using the local clock or business recovery clock of OTUn optical ports, wherein n transmits for light-path
The exponent number of unit.
In addition, first line card is used for, when there is repetition in OTN time synchronizeds path, then it is multiplexed from the high-order of reception
In OTUk, selection recovers ODUm clocks all the way.
In addition, first line card, further comprises：First interface unit, decapsulation unit, the first data and clock turn
Change unit；
The first interface unit is used for, and realizes opto-electronic conversion, and serioparallel exchange；
The decapsulation unit is used for, the acquisition of OTUk expense, and recovers clock frequency from ODUm data；
First data and clock converting unit are used for, it would be desirable to which the data of exchange are encapsulated as the data frame lattice of backboard
Formula, and it is switched to backboard clock zone.
In addition, second line card, further comprises：Second interface unit, encapsulation unit, the second data and clock conversion
Unit,
The second interface unit is used for, and realizes opto-electronic conversion, and serioparallel exchange；
The encapsulation unit is used for, and carries out the encapsulation process of OTUk expense, and clock frequency is recovered from ODUm data
Rate；
Second data and clock converting unit are used for, and the data frame format that backboard receives is switched into business frame format,
And it is switched to business clock domain.
In summary, the present invention replaces each equipment in Time Transmission path by the veneer of development support Time Transmission
On corresponding veneer, realize in the case where the OTN equipment of existing network has frequency departure, support precise synchronization.
Compared with prior art, the present invention can be in the case where not changing existing network OTN equipment systems, by designing branch
The business board of time synchronized is held, replaces the veneer on time synchronized path on existing, realizes the high-precise synchronization of time.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is OTN networks and time synchronized configuration schematic diagram in the embodiment of the present invention；
Fig. 2 is OTN device interior time synchronized schematic diagrames 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 dorsulum of embodiment of the present invention both sides；
Fig. 6 is by changing the schematic diagram for supporting time synchronized veneer to realize time synchronized 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 illustrating the present invention, make below with reference to implementation of the drawings and the specific embodiments to technical solution of the present invention
It is described in further detail.It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application
Can mutually it be combined.
As shown in figure 1, set using PTN, P-OTN (packet optical transport network) and OTN equipment network interworkings, wherein P-OTN
Standby possess synchronous EEC (Ethernet Equipment Clock, ether equipment clock) clock synchronizing function, the website in Fig. 1
3-7 is existing OTN networks, and each OTN station clocks are in free oscillation.Solid line represents existing business configuration in figure, empty
Line represents time synchronized path, and interface is OTUk (k=1,2,3 or 4).Assuming that 1 point of PTN device can obtain network clocking
And the time, 2 points (OC+TC mode is a species of time synchronism equipment as defined in 1588V2 agreements by the way of OC+TC
Type, it is common transmission clock), 1588 messages received all the way are selected, recover the time, the system time as equipment；Together
When all 1588 messages received be encapsulated into OTN carry out transparent transmission.
For OTN network internals by using supporting the veneer of time synchronized to carry out time synchronized, the veneer has following work(
Energy：In line receiver and sending direction, it can recover the clock of (or multichannel) ODUm (m ＜=k) all the way, utilize the clock
A local zone time is produced, and time synchronized is carried out using 1588 agreements.
Below by taking the time synchronized function of website 3 and website 5 as an example, the time synchronized of the embodiment of the present invention is carried out in detail
Explanation.
The line card OTUn Zhong Mou road ODUm (m ＜=n) of website 3 come from the PTN network access of website 2, extensive by circuit
Appear again its clock clk2 (node3).Equally, on the first line card (linecard1) of website 5, road ODUm can also be recovered
Clock frequency clk0 (node 5).Linecard1 business needs to use local clock local_clk1, is transformed into backboard
Data format, being then passed to cross board, (wherein give cross board is to need to be crossed to equipment other optical ports from what optical port was come in
Business datum, the data need to be encapsulated as realizing the specific frame structure required for intersecting), ODUm is exchanged to the by cross board
Two line cards (linecard2).Linecard2 using local_clk1 receive backboard data, can also recover ODUm when
Clock frequency clk2 (node5), while (refer to the business tranmitting data register of OTUn optical ports, Ke Yishi using tx reference clock
The OTUn clocks recovered on veneer in local clock or business) sending whole OTUn, (wherein n is light-path biography
The exponent number of defeated unit, when transparent transmission service, n=m, at this moment tx reference clock are clk2).Therefore clk2 (node
3), clk0 (node 5) and clk2 (node 5) is identical clock frequency, is all from the PTN network equipment clock of website 2.
For ease of description, whole time-domain in Fig. 2 is divided, as shown in figure 3, the time corresponding to clk2 (node 3)
For time0, the time corresponding to clk0 (node 5) is time1, and the time corresponding to linecard1 local_clk1 is time2,
Time corresponding to linecard2 local_clk1 is time3, and the time corresponding to clk2 (node 5) is time4.Time synchronized
Target be so that time4=time0.
Due in the both sides of website 3 and the line interface of website 5, clk2 (node 3) and clk0 (node 5) frequency phase
Deng, therefore 1588 agreements can be used, using ODUk expense, realize mutual time synchronized, as shown in figure 4, time0 and
Time1 realizes synchronous.
Similarly, since time2 and time3 are produced by local_clk1, if the round trip delay time of transposition circuit is symmetrical
, then 1588 agreements can be used, realizes and intersects front and rear time synchronized；If the round-trip delay asymmetry of transposition circuit is still
When comparing fixed, the time can be modified by testing the asymmetric numerical value of each crossedpath.As shown in figure 5, realize
Time2 and time3 time synchronized.
Finally, in order to which time1 to be passed to the time4 of another piece of business board, following method can be used：
After linecard1 receives OTUk frames or multi-frame, after retrieving frame head, time1 and time2 now are recorded, then will
Time2-time1 is placed in the reserve bytes of ODUm business or the reserve bytes of backplane signal form, by intersecting, is passed to
linecard2.Because time1 is consistent with time4 clock frequency, time2 and time3 time synchronized, so time3-
Time4=time2-time1, it can thus be derived that time4.In this process, due to time2-time1 from
Linecard1 is delivered to the delay of linecard2 having times, and time4 precision can be caused necessarily to influence.Analyzing it influences such as
Under：Assuming that both clk0 (node 5) and local_clk1 clock frequency difference 20ppm, then due to OTUk greatest frame period
For as k=1, T=48.971us.Then from linecard1 from record time2-time1, passed to by the numerical value
Linecard2, the time of cost are assumed to 2 OTUk cycle, then error is less than 2 ns, can receive, that is, think
Time4 can be synchronous with time0.
Pass through said process, it can be seen that：Certain road ODUm clocks that line card 1 recovers from optical port to cross board direction, line card 2
Certain road ODUm clocks recovered from cross board to optical port direction；Also, the time marked off inside line card by different clocks
Domain, so as to carry out the Time Transmission in different time domain, realize the Time Transmission of website 3 to website 5.
Similarly, website 5 can also hand on time4, last website 8 and website 9 by recover website 2 when
Between, as the system time of whole equipment, the time can of so whole OTN networks is realized synchronously.
Wherein, 1588 messages are stamped into time stamp ingress timestamp when entering OTN networks in P-OTN websites,
Then time stamp egress timestamp are stamped out in the P-OTN websites for going out OTN networks, can thus realizes whole OTN nets
The transparent clock of network.Such as stamped in website 2 into time stamp, stamp out time stamp in website 8 and website 9.
The Time Transmission that OTN asynchronous networks are realized in the embodiment of the present invention is illustrated in figure 6, by Time Transmission to PTNA,
The schematic diagram of PTNB and PTNC networks.Wherein assume that PTN network elements 1 and network element 12 can obtain time message, during so as to recover
Between, and the time is all in required precision scope etc, then it can plan and give the Time Transmission of network element 1 to PTN A and PTN B nets
Network, give the Time Transmission of network element 12 to PTN C networks.
By using the veneer for supporting time synchronized function, original veneer in synchronous path is replaced, it is possible to when realizing
Between synchronizing function.If the access device of whole OTN networks is synchronous network device.Such as PTN (supports that synchronous ether is same
Step), or during SDH (SDH), the speed of its OTN interface is the synchronised clock of equipment.Now, it is same when the OTN times
When there is repetition in step footpath, then in the OTUk for the high-order multiplexing that line side receives, it is only necessary to recover ODUm clocks all the way, to its time
Synchronization.Such as in Fig. 6, the business of website 13 and website 3 passes to website 7 after high-order is multiplexed, by website 5, then
Only need to select a recovered clock in website 3 or website 13 in the line receiver of website 7.
In addition, a kind of time synchronism apparatus of optical transfer network asynchronous network, the device are additionally provided in the embodiment of the present invention
Mainly include the first line card and the second line card, wherein：
First line card is used for, and when receiving the time message that other websites in optical transport network transmit, recovers
One or more clock ODUm clock frequency, and the business of this line card is converted to the data frame lattice of backboard using local clock
Formula, the clock ODUm is sent to by second line card by cross board；Wherein m is the positive integer less than or equal to k, and k is
Light-path data cell exponent number, k=1,2,3,4,
Second line card is used for, and receives backboard data frame using local clock, recovers the clock of the clock ODUm
Frequency, and whole OTUn is sent using the local clock or business recovery clock of OTUn optical ports, wherein n transmits for light-path
The exponent number of unit.
Wherein, first line card is used for, and when there is repetition in OTN time synchronizeds path, is then multiplexed from the high-order of reception
In OTUk, selection recovers ODUm clocks all the way.
In addition, first line card, further comprises：First interface unit, decapsulation unit, the first data and clock turn
Change unit；
The first interface unit is used for, and realizes opto-electronic conversion, and serioparallel exchange；
The decapsulation unit is used for, the acquisition of OTUk expense, and recovers clock frequency from ODUm data；
First data and clock converting unit are used for, it would be desirable to which the data of exchange are encapsulated as the data frame lattice of backboard
Formula, and it is switched to backboard clock zone.
In addition, second line card, further comprises：Second interface unit, encapsulation unit, the second data and clock conversion
Unit,
The second interface unit is used for, and realizes opto-electronic conversion, and serioparallel exchange；
The encapsulation unit is used for, and carries out the encapsulation process of OTUk expense, and clock frequency is recovered from ODUm data
Rate；
Second data and clock converting unit are used for, and the data frame format that backboard receives is switched into business frame format,
And it is switched to business clock domain.
Wherein, according to different application demands, described the first line card and the second line card, can be independent line cards,
The function of the two can be integrated among same bracing cable card.
It these are only that the present invention's is preferable to carry out case, be not intended to limit the invention, the present invention can also have other
Various embodiments, in the case of without departing substantially from spirit of the invention and its essence, those skilled in the art can be according to this hair
It is bright to make various corresponding changes and deformation, but these corresponding changes and deformation should all belong to appended claims of the invention
Protection domain.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored
Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein
The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
Claims (9)
1. a kind of method for synchronizing time of optical transfer network asynchronous network, it is characterised in that the website in optical transport network OTN receives
To other website transmission time message when；
The first line card in the website recovers one or more clock light-path data cell ODUm clock frequency, wherein
M is positive integer less than or equal to k, and k is light-path data cell exponent number, k=1,2,3,4, the business of first line card makes
The data frame format of backboard is converted to local clock, the clock ODUm is sent to by cross board in the website
Two line cards；
Second line card receives backboard data frame using local clock, recovers the clock frequency of the clock ODUm, and make
Whole OTUn is sent with the local clock or business recovery clock of light tunnel unit OTUn optical ports, wherein n leads to for light
The exponent number of road transmission unit.
2. the method as described in claim 1, it is characterised in that the OTN networks combine group with PTN device and P-OTN equipment
During net, before the time message transmits in the OTN networks, including：
The PTN device obtains 1588 messages and sent to the P-OTN equipment；
1588 messages that the P-OTN equipment selection receives all the way recover the time, as the system time of equipment, simultaneously will
All 1588 messages received, which are encapsulated into the OTN networks, carries out transparent transmission.
3. method as claimed in claim 1 or 2, it is characterised in that methods described also includes：
When there is repetition in OTN time synchronizeds path, then in the OTUk that first line card is multiplexed from the high-order of reception, selection recovers
ODUm clocks all the way.
4. the method as described in claim 1, it is characterised in that
As n=m, second line card sends whole OTUn using business recovery clock；Otherwise, second line card uses
Local clock sends whole OTUn.
5. the method as described in claim 1, it is characterised in that methods described also includes：
1588 are stamped into the P-OTN websites of the OTN networks in the time message and enter time stamp, go out institute in the time message
The P-OTN websites for stating OTN networks stamp out time stamp.
6. a kind of time synchronism apparatus of optical transfer network asynchronous network, it is characterised in that described device includes：First line card and
Two line cards；
First line card is used for, and when receiving the time message that other websites in optical transport network transmit, recovers all the way
Or multipath clock ODUm clock frequency, and the business of this line card is converted to the data frame format of backboard using local clock,
The clock ODUm is sent to by second line card by cross board；Wherein m is the positive integer less than or equal to k, and k leads to for light
Circuit-switched data unit exponent number, k=1,2,3,4,
Second line card is used for, and receives backboard data frame using local clock, recovers the clock frequency of the clock ODUm,
And whole OTUn is sent using the local clock or business recovery clock of OTUn optical ports, wherein n is light-path transmission unit
Exponent number.
7. device as claimed in claim 6, it is characterised in that
First line card is used for, when there is repetition in OTN time synchronizeds path, then in the OTUk being multiplexed from the high-order of reception, and choosing
Select recovery ODUm clocks all the way.
8. device as claimed in claim 6, it is characterised in that
First line card, further comprises：First interface unit, decapsulation unit, the first data and clock converting unit；
The first interface unit is used for, and realizes opto-electronic conversion, and serioparallel exchange；
The decapsulation unit is used for, the acquisition of OTUk expense, and recovers clock frequency from ODUm data；
First data and clock converting unit are used for, it would be desirable to and the data of exchange are encapsulated as the data frame format of backboard, and
It is switched to backboard clock zone.
9. the device as described in claim 6,7 or 8 are any, it is characterised in that
Second line card, further comprises：Second interface unit, encapsulation unit, the second data and clock converting unit,
The second interface unit is used for, and realizes opto-electronic conversion, and serioparallel exchange；
The encapsulation unit is used for, and carries out the encapsulation process of OTUk expense, and recover clock frequency from ODUm data；
Second data and clock converting unit are used for, and the data frame format that backboard receives are switched into business frame format, and cut
Change to business clock domain.
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| US11296806B2 (en) * | 2018-06-11 | 2022-04-05 | Skyworks Solutions, Inc. | Shared communication channel that interleaves 1 PPS signals and messaging |
| CN111262641A (en) * | 2018-11-30 | 2020-06-09 | 中国移动通信集团浙江有限公司 | PTN network architecture and clock synchronization method |
| US11526193B2 (en) | 2019-03-07 | 2022-12-13 | Skyworks Solutions, Inc. | Maintaining the correct time when counter values are transferred between clock domains |
| US11088819B1 (en) | 2020-03-31 | 2021-08-10 | Silicon Laboratories Inc. | Secondary phase compensation assist for PLL IO delay |
| US11088816B1 (en) | 2020-03-31 | 2021-08-10 | Silicon Laboratories Inc. | Secondary phase compensation assist for PLL IO delay aligning sync signal to system clock signal |
| US11290250B2 (en) | 2020-04-15 | 2022-03-29 | Skyworks Solutions, Inc. | Phase transport with frequency translation without a PLL |
| CN113709602B (en) * | 2020-05-20 | 2022-09-09 | 华为技术有限公司 | Chip synchronization method and related equipment |
| US11502764B2 (en) | 2020-12-28 | 2022-11-15 | Skyworks Solutions, Inc. | FSYNC mismatch tracking |
| US11502812B1 (en) | 2021-07-14 | 2022-11-15 | Skyworks Solutions, Inc. | Data protocol over clock line |
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