CN102045155B - Method and device for transmitting time information - Google Patents
Method and device for transmitting time information Download PDFInfo
- Publication number
- CN102045155B CN102045155B CN201010516396.7A CN201010516396A CN102045155B CN 102045155 B CN102045155 B CN 102045155B CN 201010516396 A CN201010516396 A CN 201010516396A CN 102045155 B CN102045155 B CN 102045155B
- Authority
- CN
- China
- Prior art keywords
- time
- supervisory channel
- data
- temporal information
- optical supervisory
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a method and a device for transmitting time information, which is easy to realize, and avoids unnecessary alteration of services. The method comprises the following steps: extracting a data stream of a light monitoring channel from a main light path; extracting time data from the data stream of the light monitoring channel; processing the time information generated by the time data according to a clock mode used by the current node; and interpolating the time information to the data stream of the light monitoring channel, and merging the light monitoring channel into the main light path.
Description
Technical field
The present invention relates to wave division multiplexing WDM (Wavelength division multiplexing, wavelength division multiplexing)/OTN(Optical Transport Network, optical transfer network) apparatus field, be specifically related to the method and apparatus that temporal information transmits.
Background technology
Along with the development of the communication technology, transmit precise time information for communication network, the demand of time synchronized is strong all the more.Precise time information can be for the 3G network field such as synchronously.Therefore for bearer network equipment, particularly for wavelength division multiplexing, i.e. WDM equipment and optical transfer network, i.e. OTN equipment, as the important component part of bearer network, also must provide time synchronized function.
Synchronous in order to realize precise time at WDM/OTN equipment, generally adopt IEEE 1588 agreements.It has stipulated to realize between two point devices the algorithm of 2 time synchronized.Can reach in theory the synchronization accuracy of submicrosecond level.The method can produce the needed data of some time synchronized between two synchronization nodes, is called time data.
Current two kinds of implementation methods at WDM/OTN equipment that proposed, a kind of is that time data is regarded as in the main optical path Business Stream that general service stream is encapsulated into equipment and transmitted.One is that time data is extracted, and is mapped in the overhead byte of OTN of equipment and transmits.Figure 1 shows that existing WDM/OTN device structure schematic diagram.This equipment is supported time transmitting function, and wherein, light path processing unit is responsible for acceptance and the transmission of optical path signal; Service Processing Unit is responsible for Business Processing, in the time including time data in discovery business datum, extracts and is given to time data processing unit and process; Time data processing unit also can insert time data in business datum, and these time datas can arrive other device node along with business datum enters optic path.If time data processing unit has also connected time source equipment or time application equipment, time data processing unit can carry out the transmission of time as required with these equipment.
There is defect separately in above two kinds of methods.The first need to be in Business Stream positioning time data processing, and main business data volume is far longer than the data volume of time data.High to location and disposal ability requirement, be unfavorable for realizing.Need to process business.The second, needs the mapping of time synchronized data and takies OTN expense.Because OTN overhead byte is limited, cannot accomplish the complete mapping with time data.And which still needs processing business.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of temporal information transfer approach and device, realizes simply, avoids the variation unnecessary to business.
For solving the problems of the technologies described above, the invention provides a kind of temporal information transfer approach, comprising:
From main optical path, extract the data flow of Optical Supervisory Channel;
From the data flow of Optical Supervisory Channel extraction time data;
The clock module adopting according to present node is processed described time data rise time information;
Described temporal information is inserted in the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in described main optical path.
Further, when the clock module that present node adopts is boundary clock pattern, the described step according to data clock module processing time, information rise time comprises: calculate absolute time according to described time data, using described absolute time as temporal information; Or
When the clock module that present node adopts is transmission clock pattern, the described step according to data clock module processing time, information rise time comprises: calculate the residence time of described time data at this node, using described residence time as temporal information.
Further, the step in the described data flow of temporal information being inserted to Optical Supervisory Channel comprises: first temporal information is converted to the form that can transmit in Optical Supervisory Channel, then be inserted in the data flow of Optical Supervisory Channel.
For solving the problems of the technologies described above, the present invention also provides a kind of temporal information conveyer, comprising:
Light path processing unit, it is for extracting the data flow of Optical Supervisory Channel from main optical path;
The extraction module of Optical Supervisory Channel processing unit, it is for the data flow extraction time data from Optical Supervisory Channel;
Time processing unit, it processes described time data rise time information for the clock module adopting according to present node;
The merging module of Optical Supervisory Channel processing unit, it is for described temporal information being inserted to the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in described main optical path.
Further, time processing unit, while being boundary clock pattern, calculates absolute time according to described time data, using described absolute time as temporal information for the clock module adopting at present node; Or, when the clock module adopting is transmission clock pattern, calculate the residence time of described time data at this node, using described residence time as temporal information at present node.
For solving the problems of the technologies described above, the present invention also provides a kind of temporal information transfer approach, comprising:
From main optical path, extract the data flow of Optical Supervisory Channel;
From the data flow of Optical Supervisory Channel extraction time data;
According to the time of the synchronous present node of described time data, and the clock module adopting according to present node is processed described time data rise time information;
Described temporal information is sent to external interface device.
Further, when the clock module that present node adopts is boundary clock pattern or ordinary clock pattern, the described step of processing described time data rise time information according to clock module comprises: calculate absolute time according to described time data, using described absolute time as temporal information.
For solving the problems of the technologies described above, the present invention also provides a kind of temporal information conveyer, comprising:
Light path processing unit, it is for extracting the data flow of Optical Supervisory Channel from main optical path;
Optical Supervisory Channel processing unit, it is for the data flow extraction time data from Optical Supervisory Channel;
Time processing unit, it,, for according to the time of the synchronous present node of described time data, processes described time data rise time information according to the clock module of present node employing, and described temporal information is sent to external interface.
Further, described time processing unit, while being boundary clock pattern or ordinary clock pattern, calculates absolute time according to described time data, using described absolute time as temporal information for the clock module adopting at present node.
For solving the problems of the technologies described above, the present invention also provides a kind of temporal information transfer approach, comprising:
From main optical path, extract the data flow of Optical Supervisory Channel;
From external interface device acquisition time data, according to the time of the synchronous present node of described time data, the clock module adopting according to present node is processed described time data rise time information;
Described temporal information is inserted in the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in main optical path.
Further, when the clock module that present node adopts is boundary clock pattern or ordinary clock pattern, the described step according to data clock module processing time, information rise time comprises: calculate absolute time according to described time data, using described absolute time as temporal information.
Further, the step in the described data flow of temporal information being inserted to Optical Supervisory Channel comprises: first temporal information is converted to the form that can transmit in Optical Supervisory Channel, then be inserted in the data flow of Optical Supervisory Channel.
For solving the problems of the technologies described above, the present invention also provides a kind of temporal information conveyer, comprising:
Light path processing unit, it is for extracting the data flow of Optical Supervisory Channel from main optical path;
Time processing unit, it is for from external interface device acquisition time data, and according to the time of the synchronous present node of described time data, the clock module adopting according to present node is processed described time data rise time information;
Optical Supervisory Channel processing unit, it is for described temporal information being inserted to the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in main optical path.
Further, described time processing unit, while being boundary clock pattern or ordinary clock pattern, calculates absolute time according to described time data, using described absolute time as temporal information for the clock module adopting at present node.
Implementation method of the present invention, for realizing passage, transmits the business of WDM/OTN equipment and time synchronized data processing is isolated with the Optical Supervisory Channel of wave-division device (Optical Supervisory Channel is called for short OSC).Due to the independent of service of wavelength-division, can not cause because realizing this function the modification of service design, guaranteed the independence of wave-division device business, be easy to dispose and updating apparatus.
Accompanying drawing explanation
Fig. 1 is existing WDM/OTN device structure schematic diagram;
Fig. 2 is the flow chart of the embodiment of the present invention 1;
Fig. 3 is WDM/OTN device structure schematic diagram in the embodiment of the present invention 1;
Fig. 4 is the flow chart of the embodiment of the present invention 2;
Fig. 5 is WDM/OTN device structure schematic diagram in the embodiment of the present invention 2 and 3;
Fig. 6 is the flow chart of the embodiment of the present invention 3;
Fig. 7 is the device structure schematic diagram of Application Example of the present invention;
Fig. 8 is the realization flow figure of Application Example of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
Embodiment 1
The present embodiment is mainly described the time of reading synchronous mistake the main optical path sending from superior node, and is put into the descending light path of this node this time.As shown in Figure 2, comprise the following steps:
From main optical path, extract the data flow of Optical Supervisory Channel;
From the data flow of Optical Supervisory Channel extraction time data;
The clock module adopting according to present node is processed described time data rise time information;
Described temporal information is inserted in the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in described main optical path.
Clock module refers to the pattern of IEEE1588 agreement defined, and in the present embodiment, the clock module that present node adopts comprises boundary clock (Boundary Clock is called for short BC) pattern and transmission clock (Transparent Clock is called for short TC) pattern.While adopting BC pattern, present node according to synchronous this node of the time data of upstream node time, calculates absolute time according to described time data afterwards again, and described absolute time is sent to downstream node as temporal information.While adopting TC pattern, asynchronous nodal clock of present node, it calculates the residence time of described time data at this node, i.e. and the time deviation of transmission time information and time of reception data, using described residence time as temporal information.
Preferably, in the step in the data flow of temporal information being inserted to Optical Supervisory Channel, first temporal information is converted to the form that can transmit in Optical Supervisory Channel, then be inserted in the data flow of Optical Supervisory Channel.
The device of realizing said method can, referring to Fig. 3, comprise:
Light path processing unit, it is for extracting the data flow of Optical Supervisory Channel from main optical path;
The extraction module of Optical Supervisory Channel processing unit, it is for the data flow extraction time data from Optical Supervisory Channel;
Time processing unit, it processes described time data rise time information for the clock module adopting according to present node;
The merging module of Optical Supervisory Channel processing unit, it is for described temporal information being inserted to the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in described main optical path.
Preferably, described time processing unit, while being boundary clock pattern, calculates absolute time according to described time data, using described absolute time as temporal information for the clock module adopting at present node; Or, when the clock module adopting is transmission clock pattern, calculate the residence time of described time data at this node, using described residence time as temporal information at present node.
Due to time data only and Optical Supervisory Channel produce relation, discord Service Processing Unit is mutual, can traffic affecting realization.
Embodiment 2
The present embodiment is mainly described the time of reading synchronous mistake from the data flow of the Optical Supervisory Channel of main optical path, but is not put into the descending light path of this node this time, uses but this time is offered to external interface.As shown in Figure 4, comprise the following steps:
From main optical path, extract the data flow of Optical Supervisory Channel;
From the data flow of Optical Supervisory Channel extraction time data;
According to the time of the synchronous present node of described time data, and the clock module adopting according to present node is processed described time data rise time information;
Described temporal information is sent to external interface device.
In the present embodiment, external interface device is time application unit, uses the unit of lock in time, such as NodeB etc.Whether be to adopt the equipment of IEEE1588 agreement to decide the clock module of present node according to external interface device.If external interface device does not adopt IEEE1588 agreement, adopt ordinary clock (Ordinary Clock is called for short OC) pattern; If external interface device adopts IEEE1588 agreement, adopt BC pattern.When the clock module that present node adopts is BC pattern or OC pattern, the step that the clock module adopting according to present node is processed described time data rise time information comprises: calculate absolute time according to described time data, using described absolute time as temporal information.
Can realize said method by device described in Fig. 5, the device of realizing said method comprises:
Light path processing unit, it is for extracting the data flow of Optical Supervisory Channel from main optical path;
Optical Supervisory Channel processing unit, it is for the data flow extraction time data from Optical Supervisory Channel;
Time processing unit, it,, for according to the time of the synchronous present node of described time data, processes described time data rise time information according to the clock module of present node employing, and described temporal information is sent to external interface.
Preferably, described time processing unit, while being boundary clock pattern or ordinary clock pattern, calculates absolute time according to described time data, using described absolute time as temporal information for the clock module adopting at present node.
Embodiment 3
The present embodiment is mainly described from external interface and is read the time data of synchronously crossing, and is put into the descending light path of this node this time.As shown in Figure 6, comprise the following steps:
From main optical path, extract the data flow of Optical Supervisory Channel;
From external interface device acquisition time data, according to the time of the synchronous present node of described time data, the clock module adopting according to present node is processed described time data rise time information;
Described temporal information is inserted in the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in main optical path.
In the present embodiment, the time on described external interface device is the absolute time of synchronous mistake.External interface device can be such as time server of external time source unit, or time application unit, for example NodeB.
Whether be to adopt the equipment of IEEE1588 agreement to decide the clock module of present node according to external interface device.If external interface device does not adopt IEEE1588 agreement, adopt OC pattern; If external interface device adopts IEEE1588 agreement, adopt BC pattern.When the clock module that present node adopts is BC pattern or OC pattern, the step that the clock module adopting according to present node is processed described time data rise time information comprises: calculate absolute time according to described time data, using described absolute time as temporal information.
Can realize said method by device described in Fig. 5, the device of realizing said method comprises:
Light path processing unit, it is for extracting the data flow of Optical Supervisory Channel from main optical path;
Time processing unit, it is for from external interface device acquisition time data, and according to the time of the synchronous present node of described time data, the clock module adopting according to present node is processed described time data rise time information;
Optical Supervisory Channel processing unit, it is for described temporal information being inserted to the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in main optical path.
Preferably, described time processing unit, while being boundary clock pattern or ordinary clock pattern, calculates absolute time according to described time data, using described absolute time as temporal information for the clock module adopting at present node.
Application example
In the present embodiment, realize Optical Supervisory Channel by the mode of Fast Ethernet, between each node, adopt the frame format of 100M speed Ethernet to transmit the data flow of OSC.The upstream node of node 1 adopts synchronous ethernet pattern to realize clock synchronous.The time processing unit of present node 1 adopts boundary clock pattern to realize.
Implementation structure as shown in Figure 7.Optical Supervisory Channel processing unit adopts 100M ethernet controller to realize in the present embodiment, the conversion between its extraction for time data, IEEE1588 protocol data and ethernet frame, and the insertion of temporal information.
Realization flow as shown in Figure 8.
Step 1: light path processing unit extracts the 100M ethernet signal of Optical Supervisory Channel from main optical path;
Step 2:100M ethernet controller extracts the IEEE1588 agreement time data frame in ethernet signal, and the time data of extraction is sent into 1588 boundary clock unit;
Step 3:1588 boundary clock unit carries out boundary clock processing and obtains the time data of IEEE1588 protocol format, simultaneously according to the clock of the synchronous present node of time data;
The time data that step 4:100M ethernet controller provides 1588 boundary clock unit converts 100M ethernet data frame to, puts into Optical Supervisory Channel and Optical Supervisory Channel is merged to main optical path.
One of ordinary skill in the art will appreciate that all or part of step in said method can carry out instruction related hardware by program and complete, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, the each module in above-described embodiment or unit can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Certainly; 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 are when making 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.
Claims (14)
1. a temporal information transfer approach, comprising:
From main optical path, extract the data flow of Optical Supervisory Channel;
From the data flow of Optical Supervisory Channel extraction time data;
The clock module adopting according to present node is processed described time data rise time information;
Described temporal information is inserted in the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in described main optical path.
2. the method for claim 1, is characterized in that:
When the clock module that present node adopts is boundary clock pattern, the described step according to data clock module processing time, information rise time comprises: calculate absolute time according to described time data, using described absolute time as temporal information; Or
When the clock module that present node adopts is transmission clock pattern, the described step according to data clock module processing time, information rise time comprises: calculate the residence time of described time data at this node, using described residence time as temporal information.
3. the method for claim 1, is characterized in that:
Step in the described data flow of temporal information being inserted to Optical Supervisory Channel comprises: first temporal information is converted to the form that can transmit in Optical Supervisory Channel, then be inserted in the data flow of Optical Supervisory Channel.
4. a temporal information conveyer, comprising:
Light path processing unit, it is for extracting the data flow of Optical Supervisory Channel from main optical path;
The extraction module of Optical Supervisory Channel processing unit, it is for the data flow extraction time data from Optical Supervisory Channel;
Time processing unit, it processes described time data rise time information for the clock module adopting according to present node;
The merging module of Optical Supervisory Channel processing unit, it is for described temporal information being inserted to the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in described main optical path.
5. device as claimed in claim 4, is characterized in that:
Time processing unit, while being boundary clock pattern, calculates absolute time according to described time data, using described absolute time as temporal information for the clock module adopting at present node; Or, when the clock module adopting is transmission clock pattern, calculate the residence time of described time data at this node, using described residence time as temporal information at present node.
6. a temporal information transfer approach, comprising:
From main optical path, extract the data flow of Optical Supervisory Channel;
From the data flow of Optical Supervisory Channel extraction time data;
According to the time of the synchronous present node of described time data, and the clock module adopting according to present node is processed described time data rise time information;
Described temporal information is sent to external interface device.
7. method as claimed in claim 6, is characterized in that:
When the clock module that present node adopts is boundary clock pattern or ordinary clock pattern, the described step of processing described time data rise time information according to clock module comprises: calculate absolute time according to described time data, using described absolute time as temporal information.
8. a temporal information conveyer, comprising:
Light path processing unit, it is for extracting the data flow of Optical Supervisory Channel from main optical path;
Optical Supervisory Channel processing unit, it is for the data flow extraction time data from Optical Supervisory Channel;
Time processing unit, it,, for according to the time of the synchronous present node of described time data, processes described time data rise time information according to the clock module of present node employing, and described temporal information is sent to external interface.
9. device as claimed in claim 8, is characterized in that:
Described time processing unit, while being boundary clock pattern or ordinary clock pattern, calculates absolute time according to described time data, using described absolute time as temporal information for the clock module adopting at present node.
10. a temporal information transfer approach, comprising:
From main optical path, extract the data flow of Optical Supervisory Channel;
From external interface device acquisition time data, according to the time of the synchronous present node of described time data, the clock module adopting according to present node is processed described time data rise time information;
Described temporal information is inserted in the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in main optical path.
11. methods as claimed in claim 10, is characterized in that:
When the clock module that present node adopts is boundary clock pattern or ordinary clock pattern, the described step according to data clock module processing time, information rise time comprises: calculate absolute time according to described time data, using described absolute time as temporal information.
12. methods as claimed in claim 10, is characterized in that:
Step in the described data flow of temporal information being inserted to Optical Supervisory Channel comprises: first temporal information is converted to the form that can transmit in Optical Supervisory Channel, then be inserted in the data flow of Optical Supervisory Channel.
13. 1 kinds of temporal information conveyers, comprising:
Light path processing unit, it is for extracting the data flow of Optical Supervisory Channel from main optical path;
Time processing unit, it is for from external interface device acquisition time data, and according to the time of the synchronous present node of described time data, the clock module adopting according to present node is processed described time data rise time information;
Optical Supervisory Channel processing unit, it is for described temporal information being inserted to the data flow of described Optical Supervisory Channel, and described Optical Supervisory Channel is merged in main optical path.
14. devices as claimed in claim 13, is characterized in that:
Described time processing unit, while being boundary clock pattern or ordinary clock pattern, calculates absolute time according to described time data, using described absolute time as temporal information for the clock module adopting at present node.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010516396.7A CN102045155B (en) | 2010-10-22 | 2010-10-22 | Method and device for transmitting time information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010516396.7A CN102045155B (en) | 2010-10-22 | 2010-10-22 | Method and device for transmitting time information |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102045155A CN102045155A (en) | 2011-05-04 |
| CN102045155B true CN102045155B (en) | 2014-06-11 |
Family
ID=43910978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010516396.7A Active CN102045155B (en) | 2010-10-22 | 2010-10-22 | Method and device for transmitting time information |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102045155B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386990B (en) * | 2011-12-21 | 2014-10-29 | 烽火通信科技股份有限公司 | Method and device for realizing 1588 clock synchronization in OTN system |
| CN113541776B (en) * | 2020-04-14 | 2022-10-04 | 华为技术有限公司 | Method for implementing optical fiber detection and clock synchronization and related equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101447850A (en) * | 2007-11-28 | 2009-06-03 | 中兴通讯股份有限公司 | Device for transmitting and receiving clock by utilizing optical supervisory channel and method for sending clock |
| CN101795423A (en) * | 2009-02-04 | 2010-08-04 | 中兴通讯股份有限公司 | Method and system for synchronizing time of passive optical network |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080031283A1 (en) * | 2006-08-07 | 2008-02-07 | Martin Curran-Gray | Time synchronization for network aware devices |
-
2010
- 2010-10-22 CN CN201010516396.7A patent/CN102045155B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101447850A (en) * | 2007-11-28 | 2009-06-03 | 中兴通讯股份有限公司 | Device for transmitting and receiving clock by utilizing optical supervisory channel and method for sending clock |
| CN101795423A (en) * | 2009-02-04 | 2010-08-04 | 中兴通讯股份有限公司 | Method and system for synchronizing time of passive optical network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102045155A (en) | 2011-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2959600B1 (en) | Time synchronous pluggable transceiver | |
| CN101534185B (en) | Time synchronizing device, method and system | |
| CN107465965B (en) | Optical port implementation method and device and field programmable gate array device | |
| US7894485B2 (en) | Method and device of transmitting SDH services in passive optical network | |
| CN101741853B (en) | Method for synchronizing clock time, line card veneer and network equipment | |
| FI124018B (en) | Transceiver unit | |
| CN103404226A (en) | Method and device for data transmission | |
| JP2008177772A (en) | Digital transmission system and digital transmission method | |
| JP2008054006A (en) | Transmission frame, transmitter, receiver, communication method, and communication program | |
| CN105262565A (en) | Coding method and coding system capable of transmitting clock and data based on phase modulation | |
| CN103138866B (en) | A kind of SFP electricity mouth Apparatus and system of clock synchronous | |
| CN102006158A (en) | Clock transmission method, synchronization method and system, and sending and receiving device | |
| CN102045155B (en) | Method and device for transmitting time information | |
| JP5928931B2 (en) | Data transmission and reception method and data transmission and reception device | |
| US9780897B2 (en) | Optical transmission apparatus and optical reception apparatus | |
| CN101965701B (en) | Dual asynchronous mapping of client signals of arbitrary rate | |
| JP4680073B2 (en) | PON system | |
| CN101447850A (en) | Device for transmitting and receiving clock by utilizing optical supervisory channel and method for sending clock | |
| CN102412923B (en) | A kind of method that realizes clock synchronous between OLT and ONU in EPON system | |
| US8665912B2 (en) | Method and system for transmitting a clock rate on an Ethernet network link and applications thereof | |
| JP4941547B2 (en) | Optical transmission apparatus and optical transmission method | |
| CN102111231B (en) | Clock frequency synchronization method in STM-N network and equipment and system adopting same | |
| CN100358274C (en) | Synchronized network timing signal transmitting method based on wave division multicomplexing | |
| CN101299659A (en) | Network synchronous data interface | |
| WO2022194290A1 (en) | Method, apparatus and system for processing ethernet data in optical network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |