CN108540215B - Photosphere restores the method and system that selection is inherited in 1+1 heavy-route channel in WSON - Google Patents
Photosphere restores the method and system that selection is inherited in 1+1 heavy-route channel in WSON Download PDFInfo
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- CN108540215B CN108540215B CN201810264747.6A CN201810264747A CN108540215B CN 108540215 B CN108540215 B CN 108540215B CN 201810264747 A CN201810264747 A CN 201810264747A CN 108540215 B CN108540215 B CN 108540215B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/038—Arrangements for fault recovery using bypasses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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Abstract
The invention discloses photospheres in a kind of WSON to restore the method and system that selection is inherited in 1+1 heavy-route channel, is related to intelligent optical switching network field.Method includes the following steps: when master channel and alternate channel all interrupt, judging whether primary channel has wavelength convert function in the protected mode for restoring 1+1；If primary channel does not have wavelength convert function, router-level topology is carried out using primary route disk, wavelength, if calculating failure, carries out router-level topology using extension wire disk, wavelength；If primary channel has wavelength convert function, rerouting recovering is carried out using the route disk of last time faulty channel, wavelength, if rerouting recovering fails, carries out wavelength convert, using same route disk, changed wavelength and carry out rerouting recovering.The present invention can reasonably select heavy-route channel according to the actual situation.
Description
Technical field
The present invention relates to intelligent optical switching network field, being specifically related to photosphere in a kind of WSON, to restore 1+1 heavy-route logical
Inherit the method and system of selection in road.
Background technique
ASON (Automatically Switched Optical Network, automatically switching optical networks) is more due to possessing
The function of secondary rerouting recovering, therefore can break traditional wave-division device can only carry out the limitation of a 1+1 protection, and it is more to provide network
The secondary ability for resisting fiber break and restore business automatically, therefore ASON technology is more and more by the concern of operator and blueness
It looks at.
Since control plane rerouting recovering is soft handover recovery business, therefore the hardware that the recovery time of business is relatively traditional
Protection is many slowly, the service recovery time being unable to reach within the 50ms that many clients propose, so in ASON network central control
The rerouting recovering of plane processed is combined with the 1+1 protection of conventional hardware, is derived permanent 1+1 and is restored 1+1 (1plus 1&
Restoration) two kinds of distinctive protection types, wherein since utilization rate of the permanent 1+1 to Internet resources is lower, and utilization rate
The recovery form of highest common heavy-route protection is unable to satisfy customer demand in time, so restoring the protection type of 1+1
Become the recovery form that each operator more lays particular stress on.
The backup path for describing permanent 1+1 application No. is the Chinese invention patent of CN200510084149.3 restores shape
Formula, since the protected mode of permanent 1+1 is different with 1+1 is restored, the way of realization is also different.In the protected mode of permanent 1+1,
New Protection path is route disk, the wavelength of stringent succession failure path, and primary path, that is, restoration path of failure inherits master
With information, backup path inherits standby message, and failure can all be restored every time.
Restore 1+1 and initially set up a master channel and alternate channel this two service channels, in master channel
When disconnected, ASON controls plane software and acts without heavy-route, merely by wavelength-division hardware, switches the business to well-established
Alternate channel on, reach the 1+1 protection function of traditional wavelength-division, reach the traffic restoration capability within 50ms.Primary and standby
In the case where all being interrupted with the optical cable in channel, ASON controls plane and starts heavy-route function, the routing policy selected according to client
An optimal available path is calculated, and business is successfully recovered on the path, reaches the energy for resisting multiple interruption of optical cables
Power.
WSON (Wavelength Switched Optical Network, intelligent optical switching network) is based on WDM
The ASON of (Wavelength Division Multiplexing, wavelength-division multiplex) transmission network is that current ietf standard tissue is advocated
The intelligent wave minute mark led is quasi-, other than the function of traditional ASON, mainly solve optical fiber/wavelength in wavelength-division network find automatically,
The problems such as selection of line Wavelength routing, Route Selection based on damage model.
WSON control technology realizes the dynamic allocation of optical wavelength, and WSON is will to control plane to be introduced into wavelength networks,
Realize the dynamic dispatching of wavelength path.WSON is automatically performed Wavelength routing calculating and Wavelength Assignment by photosphere itself, without
The participation of management plane keeps Wavelength dispatching more intelligent, improves the efficiency of flexibility and the network management of WDM network scheduling.
The achievable intelligent control function of WSON specifically includes that at present
(1) the automatic discovery of photosphere resource: optical layer wavelength resource discovering mainly includes that each route optical port of each network element has used
The information such as wavelength resource, available wavelength resource.
(2) wavelength business provides: automatic, semi-automatic or manual assignment wavelength channel, and determines Wavelength dispatching node, avoids
Wavelength conflict problem.Wavelength convert constraint, tunable laser, physical damnification and other photospheres limit are intelligently considered when router-level topology
System.
(3) wavelength protection restores: supporting anti-multipoint fault, it is possible to provide OCH1+1/1:N protection and permanent 1+1 protection etc., it is full
Sufficient 50ms switches requirement, it can be achieved that wavelength dynamic/preset rerouting recovering function, but recovery time can realize second grade at present.
WSON is a research direction of ASON control technology, IETF (Internet Engineering Task
Force, Internet engineering task force) in the demand draft for formulating WSON, main realization photosphere resource is sent out for CCAMP working group
Existing, Wavelength routing calculates and signaling protocol extension etc. content, WSON framework and demand has been completed at present, and support
The standardization efforts such as the protocol extension of WSON.
Although WSON is still belonged to just in standardized technology, mature and application also needs certain time, its application
It is to be worth affirmative to network bring value added.End-to-end wavelength business is automatically created firstly, providing, and when router-level topology is automatic
The physical damnification and constraint condition for considering various optical parameters, on the one hand greatly reduce the complexity manually opened, another party
Face router-level topology more reasonably optimizing, effectively increases the utilization rate of Internet resources.
Secondly, providing higher survival ability, multiple failure can be resisted, in the network operation, when reducing failure and robbing logical
Between requirement, alleviate fault routine significantly and repair and give maintenance personnel's bring pressure.
But in WSON network, restores 1+1 protection and have a problem that: since photosphere 1+1 is not the shape for concurrently selecting receipts
Formula, therefore master channel and alternate channel are two mutually independent light splitting channels, thus master channel and alternate channel simultaneously
Interrupt when carrying out rerouting recovering, new heavy-route channel carries out calculating road and recovery using the wavelength in which channel, exist as
The problem of what is selected.
When controlling plane progress rerouting recovering, the calculating that the preferential wavelength using faulty channel is routed, at this
When wavelength can not calculate any available path, the wavelength available that control plane switching closes on carries out router-level topology, and most
Optical channel is restored with new wavelength eventually, here it is colorless (wavelength convert functions).It is enabled in control plane
When colorless (wavelength convert function) function, heavy-route channel is finally restored on primary single-deck or spare single-deck,
Similarly there are problems that how selecting.
Summary of the invention
The purpose of the invention is to overcome the shortcomings of above-mentioned background technique, photosphere in a kind of WSON is provided and restores 1+1 weight
Routing channel inherits the method and system of selection, can reasonably select heavy-route channel according to the actual situation.
The present invention provides photosphere in a kind of WSON and restores the method that selection is inherited in 1+1 heavy-route channel, comprising the following steps:
In the protected mode for restoring 1+1, when master channel and alternate channel all interrupt, judge whether primary channel has
Wavelength convert function；
If primary channel does not have wavelength convert function, router-level topology is carried out using primary route disk, wavelength, if meter
Failure is calculated, then carries out router-level topology using extension wire disk, wavelength；
If primary channel has wavelength convert function, weight is carried out using the route disk of last time faulty channel, wavelength
Route recovery carries out wavelength convert if rerouting recovering fails, and using same route disk, changes wavelength and carries out heavy-route
Restore.
Based on the above technical solution, if primary channel does not have wavelength convert function, using primary route disk,
It is further comprising the steps of when wavelength carries out router-level topology: if calculating failure, to retry M times, M is positive integer；Retry M mistake
After losing, extension wire disk is reused, wavelength carries out router-level topology.
Based on the above technical solution, M=10.
Based on the above technical solution, this method is further comprising the steps of:
After the completion of route disk, wavelength selection, further channel is established, completes the foundation in heavy-route channel.
Based on the above technical solution, this method is further comprising the steps of:
In the protected mode for restoring 1+1, when master channel or alternate channel interrupt, control plane is dynamic without switching
Make, is handled by wavelength-division hardware.
The present invention also provides photospheres in a kind of WSON to restore the system that selection is inherited in 1+1 heavy-route channel, including judgement list
Member, the first heavy-route unit, the second heavy-route unit, in which:
Judging unit is used for: in the protected mode for restoring 1+1, when master channel and alternate channel all interrupt, judging to lead
Whether standby channel has wavelength convert function, if primary channel does not have wavelength convert function, indicates the first heavy-route unit
Work；If primary channel has wavelength convert function, the second heavy-route cell operation is indicated；
First heavy-route unit is used for: being carried out router-level topology using primary route disk, wavelength, if calculating failure, is made
Router-level topology is carried out with extension wire disk, wavelength；
Second heavy-route unit is used for: carrying out rerouting recovering using the route disk of last time faulty channel, wavelength, such as
The failure of fruit rerouting recovering, carries out wavelength convert, using same route disk, changes wavelength and carries out rerouting recovering.
Based on the above technical solution, the first heavy-route unit is routed using primary route disk, wavelength
When calculating, if calculating failure, retry M times, M is positive integer；After retrying M failure, reuse extension wire disk, wavelength into
Row router-level topology.
Based on the above technical solution, M=10.
Based on the above technical solution, which further includes that further channel establishes unit, and further channel establishes unit
For: after the completion of route disk, wavelength selection, further channel is established, completes the foundation in heavy-route channel.
Based on the above technical solution, which further includes wavelength-division hardware processing element, wavelength-division hardware processing element
For: in the protected mode for restoring 1+1, when master channel or alternate channel interrupt, control plane without switching action,
It is handled by wavelength-division hardware.
Compared with prior art, advantages of the present invention is as follows:
(1) present invention is in the protected mode for restoring 1+1, when master channel and alternate channel all interrupt, judges active and standby logical
Whether road has wavelength convert function；If primary channel does not have wavelength convert function, carried out using primary route disk, wavelength
Router-level topology carries out router-level topology using extension wire disk, wavelength if calculating failure；If primary channel has wavelength
Conversion function carries out rerouting recovering using the route disk of last time faulty channel, wavelength, if rerouting recovering fails,
Wavelength convert is carried out, using same route disk, changes wavelength and carries out rerouting recovering.The present invention can come according to the actual situation
Reasonably select heavy-route channel.
(2) present invention, will not when master channel or alternate channel break down in the protected mode for restoring 1+1
Carrying out rerouting recovering just will do it rerouting recovering only when primary channel all breaks down, and can reduce software in this way
Movement, keep system more stable.
Detailed description of the invention
Fig. 1 is that photosphere restores the flow chart that the method for selection is inherited in 1+1 heavy-route channel in WSON in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in further detail.
Embodiment 1
Shown in Figure 1, the embodiment of the present invention 1, which provides photosphere in a kind of WSON, to be restored 1+1 heavy-route channel and inherits selection
Method, comprising the following steps:
In the protected mode for restoring 1+1, when master channel and alternate channel all interrupt, judge whether primary channel has
Wavelength convert function；
If primary channel does not have wavelength convert function, router-level topology is carried out using primary route disk, wavelength, if meter
Failure is calculated, then carries out router-level topology using extension wire disk, wavelength；
If primary channel has wavelength convert function, weight is carried out using the route disk of last time faulty channel, wavelength
Route recovery carries out wavelength convert if rerouting recovering fails, and using same route disk, changes wavelength and carries out heavy-route
Restore.
In actual use, photosphere restores 1+1 there may be two kinds of use forms, a kind of for no colorless function
Restore 1+1, a kind of recovery 1+1 to start colorless function, two kinds of usage mode needs are respectively processed.
When not enabling colorless function, succession router-level topology is carried out to master channel and alternate channel respectively, is defaulted
Preferential route disk, the wavelength for using master channel, carries out route recovery；
Such as: when not enabling colorless function, the master channel of certain business is route disk 1, wavelength 1, alternate channel
It is route disk 2, wavelength 2, when master channel and alternate channel all interrupt, control plane uses the resource of route disk 1, wavelength 1
Carry out route recovery.If route recovery fails, control plane selects the resource of the route disk 2 of alternate channel, wavelength 2, carries out
Router-level topology again.
When enabling colorless function, directly attempted using the resource of the route disk of last time faulty channel, wavelength
Router-level topology is carried out, if router-level topology fails, wavelength convert is directly carried out, finds wavelength available for business recovery.
Such as: when enabling colorless function, the master channel of certain business is route disk 1, wavelength 1, and alternate channel is
Route disk 2, wavelength 2；First break if it is master channel, break after alternate channel, then carries out road using the resource of route disk 2, wavelength 2
By restoring；First break if it is alternate channel, break after master channel, then carries out route recovery using the resource of route disk 1, wavelength 1.
If route recovery fails, using same route disk, directly progress wavelength convert, wavelength available is found by business recovery.
Embodiment 2
On the basis of embodiment 1, if primary channel does not have wavelength convert function, primary route disk, wavelength are used
When carrying out router-level topology, in WSON photosphere restore 1+1 heavy-route channel inherit selection method it is further comprising the steps of:
If calculating failure, retry M times, M is positive integer；After retrying M failure, extension wire disk, wavelength are reused
Carry out router-level topology.M is preferably 10.
Such as: the master channel of certain business is route disk 1, wavelength 1, and alternate channel is route disk 2, wavelength 2, primary logical
When road and alternate channel all interrupt, control plane carries out route recovery using the resource of route disk 1, wavelength 1.Can not calculate can
It when with path, re-starts and calculates road trial: when deleting the router-level topology for restoring business for the first time, failing if calculated, control
Plane re-initiates the primary request for calculating routing, and the same resource using route disk 1, wavelength 1 is attempted to carry out router-level topology, weight
Examination number is set as 10 times according to practical engineering application experience.It retries 10 times, if all failed, control plane selects alternate channel
Route disk 2, wavelength 2 resource, carry out router-level topology again.
Embodiment 3
On the basis of embodiment 1, it further includes following that photosphere, which restores the method that selection is inherited in 1+1 heavy-route channel, in WSON
Step:
After the completion of route disk, wavelength selection, further channel is established, completes the foundation in heavy-route channel.
After the completion of route disk, wavelength selection, further channel Establishing process is carried out, this Path Setup process is conventional control
Plane SPC (Soft Permanent Connection, soft permanent connection) business Establishing process, and after calculating available routing
The downloading that light intersection is carried out to the channel related to, keeps business normal, completes the foundation in heavy-route channel.
Embodiment 4
On the basis of embodiment 1, it further includes following that photosphere, which restores the method that selection is inherited in 1+1 heavy-route channel, in WSON
Step:
In the protected mode for restoring 1+1, when master channel or alternate channel interrupt, control plane is dynamic without switching
Make, is handled by wavelength-division hardware, concrete processing procedure is determined by hardware details.
Embodiment 5
The embodiment of the present invention 5 provides photosphere in a kind of WSON and restores the system that selection is inherited in 1+1 heavy-route channel, the system
Including judging unit, the first heavy-route unit, the second heavy-route unit, in which:
Judging unit is used for: in the protected mode for restoring 1+1, when master channel and alternate channel all interrupt, judging to lead
Whether standby channel has wavelength convert function, if primary channel does not have wavelength convert function, indicates the first heavy-route unit
Work；If primary channel has wavelength convert function, the second heavy-route cell operation is indicated；
First heavy-route unit is used for: being carried out router-level topology using primary route disk, wavelength, if calculating failure, is made
Router-level topology is carried out with extension wire disk, wavelength；
Second heavy-route unit is used for: carrying out rerouting recovering using the route disk of last time faulty channel, wavelength, such as
The failure of fruit rerouting recovering, carries out wavelength convert, using same route disk, changes wavelength and carries out rerouting recovering.
In actual use, photosphere restores 1+1 there may be two kinds of use forms, a kind of for no colorless function
Restore 1+1, a kind of recovery 1+1 to start colorless function, two kinds of usage mode needs are respectively processed.
When not enabling colorless function, the first heavy-route unit respectively to master channel and alternate channel carry out after
Router-level topology is held, default priority uses route disk, the wavelength of master channel, carries out route recovery；
Such as: when not enabling colorless function, the master channel of certain business is route disk 1, wavelength 1, alternate channel
It is route disk 2, wavelength 2, when master channel and alternate channel all interrupt, control plane uses the resource of route disk 1, wavelength 1
Carry out route recovery.If route recovery fails, control plane selects the resource of the route disk 2 of alternate channel, wavelength 2, carries out
Router-level topology again.
When enabling colorless function, the second heavy-route unit directly use last time faulty channel route disk,
The resource of wavelength is attempted to carry out router-level topology, if router-level topology fails, directly carries out wavelength convert, and finding wavelength available will
Business recovery.
Such as: when enabling colorless function, the master channel of certain business is route disk 1, wavelength 1, and alternate channel is
Route disk 2, wavelength 2；First break if it is master channel, break after alternate channel, then carries out road using the resource of route disk 2, wavelength 2
By restoring；First break if it is alternate channel, break after master channel, then carries out route recovery using the resource of route disk 1, wavelength 1.
If route recovery fails, using same route disk, directly progress wavelength convert, wavelength available is found by business recovery.
Embodiment 6
On the basis of embodiment 6, if primary channel does not have wavelength convert function, the first heavy-route unit uses master
When carrying out router-level topology with route disk, wavelength, if calculating failure, retry M times, M is positive integer；After retrying M failure, then
Router-level topology is carried out using extension wire disk, wavelength.M is preferably 10.
Such as: the master channel of certain business is route disk 1, wavelength 1, and alternate channel is route disk 2, wavelength 2, primary logical
When road and alternate channel all interrupt, the first heavy-route unit carries out route recovery using the resource of route disk 1, wavelength 1.Can not
Calculate available path when, the first heavy-route unit re-start calculate road attempt: delete for the first time restore business router-level topology
When, if calculating failure, the first heavy-route unit re-initiates the primary request for calculating routing, equally uses route disk 1, wavelength
1 resource is attempted to carry out router-level topology, and number of retries is set as 10 times according to practical engineering application experience.It retries 10 times, if
All fail, the resource of the route disk 2 of the first heavy-route Unit selection alternate channel, wavelength 2 carries out router-level topology again.
Embodiment 7
It further includes subsequent that photosphere, which restores the system that selection is inherited in 1+1 heavy-route channel, on the basis of embodiment 6, in WSON
Path Setup unit, further channel are established unit and are used for: after the completion of route disk, wavelength selection, establishing further channel, complete weight road
By the foundation in channel.
After the completion of route disk, wavelength selection, further channel establishes unit and carries out further channel Establishing process, this Path Setup
Process is conventional control plane SPC business Establishing process, and carries out light to the channel related to after calculating available routing
The downloading of intersection keeps business normal, completes the foundation in heavy-route channel.
Embodiment 8
It further includes wavelength-division that photosphere, which restores the system that selection is inherited in 1+1 heavy-route channel, on the basis of embodiment 6, in WSON
Hardware processing element, wavelength-division hardware processing element are used for: in the protected mode for restoring 1+1, master channel or alternate channel
When interruption, plane is controlled without switching action, is handled by wavelength-division hardware.
Those skilled in the art can carry out various modifications to the embodiment of the present invention and modification, if these modifications and change
For type within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection scope of the present invention
Within.
The prior art that the content being not described in detail in specification is known to the skilled person.
Claims (8)
1. photosphere restores the method that selection is inherited in 1+1 heavy-route channel in a kind of WSON, which comprises the following steps:
In the protected mode for restoring 1+1, when master channel and alternate channel all interrupt, judge whether primary channel has wavelength
Conversion function；
If primary channel does not have wavelength convert function, router-level topology is carried out using primary route disk, wavelength, is lost if calculated
It loses, then carries out router-level topology using extension wire disk, wavelength；
If primary channel has wavelength convert function, heavy-route is carried out using the route disk of last time faulty channel, wavelength
Restore, if rerouting recovering fails, carry out wavelength convert, using same route disk, changes wavelength and carry out rerouting recovering；
The method also includes following steps:
In the protected mode for restoring 1+1, when master channel or alternate channel interrupt, control plane without switching action,
It is handled by wavelength-division hardware.
2. photosphere restores the method that selection is inherited in 1+1 heavy-route channel in WSON as described in claim 1, it is characterised in that:
It further include following step when carrying out router-level topology using primary route disk, wavelength if primary channel does not have wavelength convert function
It is rapid: if calculating failure, to retry M times, M is positive integer；After retrying M failure, extension wire disk is reused, wavelength carries out road
By calculating.
3. photosphere restores the method that selection is inherited in 1+1 heavy-route channel in WSON as claimed in claim 2, it is characterised in that: M
=10.
4. photosphere restores the method that selection is inherited in 1+1 heavy-route channel in WSON as described in claim 1, which is characterized in that
This method is further comprising the steps of:
After the completion of route disk, wavelength selection, further channel is established, completes the foundation in heavy-route channel.
5. photosphere restores the 1+1 heavy-route channel system of inheriting selection in a kind of WSON, which is characterized in that including judging unit,
First heavy-route unit, the second heavy-route unit and wavelength-division hardware processing element, in which:
Judging unit is used for: in the protected mode for restoring 1+1, when master channel and alternate channel all interrupt, being judged active and standby logical
Whether road has wavelength convert function, if primary channel does not have wavelength convert function, indicates the first heavy-route cell operation；
If primary channel has wavelength convert function, the second heavy-route cell operation is indicated；
First heavy-route unit is used for: router-level topology is carried out using primary route disk, wavelength, if calculating failure, using standby
Router-level topology is carried out with route disk, wavelength；
Second heavy-route unit is used for: rerouting recovering is carried out using the route disk of last time faulty channel, wavelength, if weight
Route recovery failure, carries out wavelength convert, using same route disk, changes wavelength and carries out rerouting recovering；
Wavelength-division hardware processing element is used for: in the protected mode for restoring 1+1, when master channel or alternate channel interrupt, and control
Plane processed is handled without switching action by wavelength-division hardware.
6. photosphere restores the system that selection is inherited in 1+1 heavy-route channel in WSON as claimed in claim 5, it is characterised in that:
When the first heavy-route unit carries out router-level topology using primary route disk, wavelength, if calculating failure, retry M times, M
For positive integer；After retrying M failure, extension wire disk is reused, wavelength carries out router-level topology.
7. photosphere restores the system that selection is inherited in 1+1 heavy-route channel in WSON as claimed in claim 6, it is characterised in that: M
=10.
8. photosphere restores the system that selection is inherited in 1+1 heavy-route channel in WSON as claimed in claim 5, it is characterised in that:
The system further includes that further channel establishes unit, and further channel is established unit and is used for: after the completion of route disk, wavelength selection, being established
Further channel completes the foundation in heavy-route channel.
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| EP2467960B1 (en) * | 2009-08-21 | 2019-01-09 | Telefonaktiebolaget LM Ericsson (publ) | Methods and node entities in optical networks |
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| CN105915279A (en) * | 2016-05-18 | 2016-08-31 | 烽火通信科技股份有限公司 | Method for triggering protection switching based on OTU alarm in WSON |
| CN107257256A (en) * | 2017-05-03 | 2017-10-17 | 江苏省邮电规划设计院有限责任公司 | A kind of WSON network plannings plan-validation method |
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| CN108540215A (en) | 2018-09-14 |
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