CN115801113A - Asymmetric optical line protection monitoring system with resistance and low cost - Google Patents
Asymmetric optical line protection monitoring system with resistance and low cost Download PDFInfo
- Publication number
- CN115801113A CN115801113A CN202211237826.0A CN202211237826A CN115801113A CN 115801113 A CN115801113 A CN 115801113A CN 202211237826 A CN202211237826 A CN 202211237826A CN 115801113 A CN115801113 A CN 115801113A
- Authority
- CN
- China
- Prior art keywords
- optical
- line
- optical cable
- fiber core
- protection
- 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.)
- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 181
- 238000012544 monitoring process Methods 0.000 title claims abstract description 36
- 239000000835 fiber Substances 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000000903 blocking effect Effects 0.000 claims description 22
- 239000011159 matrix material Substances 0.000 claims description 14
- 238000000253 optical time-domain reflectometry Methods 0.000 claims description 12
- 239000013307 optical fiber Substances 0.000 abstract description 9
- 238000004891 communication Methods 0.000 abstract description 4
- 239000002689 soil Substances 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The invention relates to the technical field of optical communication, and discloses an asymmetric optical line protection monitoring system with resistance and low cost; the invention realizes N by adopting an asymmetric structure and a mode of cascade connection of multi-stage optical switches: the M optical line protection system combines the use of unified NMS network management to realize the functional requirements of manual scheduling or automatic protection switching of the optical distribution line port with lower cost. Compared with the conventional 1+1OLP system, the system has more protection resources and higher reliability, and the method comprises the following steps of: the M optical line protection system is combined with multi-channel optical cable performance monitoring, the business can be switched to a standby fiber core when an optical cable line breaks down, the function of monitoring the performance of the fiber core of the optical cable is achieved, optical fiber resources are managed more efficiently, priority selection can be conducted according to the performance of the tested fiber core of the current optical cable during protection switching, the function is more complete, and user experience is better.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an asymmetric blocked low-cost optical line protection monitoring system.
Background
With the rapid development of optical communication, the number of ports of an ODF frame of a communication room is large, the interconnection relationship is complex, the management work of the room is complicated and time-consuming, the manual management of the fiber cores and ports is time-consuming and labor-consuming, the efficiency is low, the phenomenon of virtual connection, misconnection or excessive attenuation often occurs in the jumper connection, and the effective utilization rate of resources is not high, the conventional optical line protection is generally in a 1+1 mode, i.e., a spare fiber core is provided for the working fiber core, when the working fiber core fails, the working fiber core is automatically switched to a protection channel, the 1+1 line protection can complete service switching within 50ms, and the service protection function is well realized, but the defect is that only one spare fiber core can be provided, if the quality of the spare fiber core is poor or the spare fiber core is simultaneously interrupted, the failure of service switching may be caused, so that the service is interrupted, the current 1+1 line protection system has a single function, and the service is switched to the spare fiber core without having a function of monitoring the performance of the optical fiber core, the optical cable core, the performance of the optical fiber core cannot be efficiently managed, and the optical fiber core cannot be preferentially selected according to the protection performance switching when the optical cable line fails.
The invention aims to solve the problems that manual management of jumper connection of fiber cores and ports in the field is time-consuming and labor-consuming and low in efficiency, the phenomenon of virtual connection, misconnection or overlarge attenuation and the like often occurs in the jumper connection, the effective utilization rate of resources is not high, the current 1+1 line protection system has single function, only when an optical cable line fails, the service is switched to a spare fiber core, the function of monitoring the performance of the fiber core of the optical cable is not provided, the fiber resources cannot be managed more efficiently, and priority selection cannot be performed according to the performance of the fiber core of the optical cable during protection switching.
Disclosure of Invention
The invention aims to provide an asymmetrical optical line protection monitoring system with a blocking function and a low cost, which has a dust removal function, does not need manual field jumper connection, has good timeliness and higher efficiency, can avoid manual jumper connection errors, meets the functional requirements of manual scheduling or automatic protection switching of an optical distribution line port at lower cost, can switch services to a standby fiber core when an optical cable line fails, and has the performance monitoring function of the optical cable fiber core.
In order to overcome the defects of the prior art, the invention adopts the following technical scheme:
an asymmetric, resistive, low cost optical line protection monitoring system comprising N: the optical line protection system comprises an M optical line protection system and an NMS network management system, wherein the N: M optical line protection system is connected with the NMS network management system, and the N: M optical line protection system comprises a local equipment service port, an N: m non-blocking optical cross matrix, N1: M/N MEMS optical switch, optical cable line port, M WDM, 1: m MEMS optical switch, OTDR module, M and N are integers of 1-N, and M > N, M is integral multiple of N, N: n light beams are arranged in the M non-blocking light cross matrix, and the number of the light beams is 1: n service ports formed by M first MEMS optical switches and a plurality of M1: m line optical cable fiber core interfaces formed by the M second MEMS optical switches are connected with line optical cable fiber cores on each line optical cable fiber core interface, each line optical cable fiber core is provided with a WDM module, and the line optical cable fiber cores are connected with the optical fiber module 1: and the third MEMS optical switch of the M is coupled and is connected with the OTDR module.
Optionally, the network management system implements monitoring and management of the optical line protection system, and the switching may be manually completed by the network manager or automatically completed according to a specified policy.
Optionally, the N: one side port of the M optical line protection system is connected with an equipment service port (which supports N optical ports maximally) of the local station, the other side is connected with an optical cable line port (which supports M optical ports maximally, M is generally an integral multiple of N), and in addition, the multi-channel OTDR polling monitoring is coupled to the system through WDM, so that the performance monitoring management of fiber cores of M optical cables is completed.
Optionally, any path of the service port of the local device may be connected to any one of M cores of the line optical cable, since the right side is formed by 1: port expansion by an M/N optical switch is performed in the following steps of 1: the COM port of the M/N optical switch is a possible blocking point, and the blocking is required to be avoided through proper redundancy and reasonable scheduling.
Optionally, the N: taking an M non-blocking optical cross matrix as N: the submodule of the M OXC realizes that N: n is not blocked and crossed, and then a plurality of optical switches with low order (M/N) are cascaded, so that the line port scheduling and the N: the requirement of the M optical line protection function is higher in reliability compared with the traditional 1+1OLP protection.
Optionally, the ratio of 1: the M/N MEMS optical switch comprises M/N +1 terminal tail fibers, wherein one terminal tail fiber is set as an input end, and the other terminal tail fibers of No. 1-M/N are set as output ends.
The beneficial effects obtained by the invention are as follows:
1. the optical line protection system is realized based on the 2D MEMS optical switch, intelligent scheduling among optical distribution line ports is realized, manual field jumping is not needed, timeliness is good, efficiency is higher, and manual jumping errors can be avoided;
2. the invention realizes N by adopting an asymmetric structure and a mode of cascade connection of multi-stage optical switches: the M optical line protection system is combined with the use of unified NMS network management, and the functional requirements of manual scheduling or automatic protection switching of the optical distribution line ports are realized at lower cost. Compared with the traditional 1+1OLP system, the system has more protection resources and higher reliability;
3. the invention is characterized in that N: the M optical line protection system is combined with multi-channel optical cable performance monitoring, the business can be switched to a standby fiber core when an optical cable line breaks down, the function of monitoring the performance of the fiber core of the optical cable is achieved, optical fiber resources are managed more efficiently, priority selection can be conducted according to the performance of the tested fiber core of the current optical cable during protection switching, the function is more complete, and user experience is better.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.
FIG. 1 is a diagram of an NxM optical cross matrix system based on a 2D MEMS optical switch according to the present invention;
FIG. 2 is a block-free optical cross-matrix N × N connection diagram according to the present invention.
Detailed Description
In order to make the objects and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper" and "lower" and "left" and "right" etc., it is only for convenience of description and simplification of the description, but not to indicate or imply that the mechanism or assembly referred to must have a specific orientation.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, an asymmetric resistive low-cost optical line protection monitoring system includes N: the optical line protection system comprises an M optical line protection system and an NMS network management system, wherein the N: M optical line protection system is connected with the NMS network management system, and the N: M optical line protection system comprises a local equipment service port, an N: m non-blocking optical cross matrix, N1: M/N MEMS optical switch, optical cable line port, M WDM, 1: m MEMS optical switch and OTDR module, wherein M and N are integers from 1 to N, M is more than N, M is integral multiple of N, and N: n light beams are arranged in the M non-blocking light cross matrix, and the number of the light beams is 1: n service ports formed by M first MEMS optical switches and a plurality of M1: m line optical cable fiber core interfaces formed by the M second MEMS optical switches are connected with line optical cable fiber cores on each line optical cable fiber core interface, each line optical cable fiber core is provided with a WDM module, and the line optical cable fiber cores are connected with the optical fiber module 1: m, coupling a third MEMS optical switch, where the third MEMS optical switch is connected to an OTDR module, the network management system implements monitoring and management of an optical line protection system, and the switching may be manually completed by the network management or automatically completed according to a specified policy, where N: one side port of the M optical line protection system is connected with an equipment service port (which supports N optical ports maximally) of the local station, the other side is connected with an optical cable line port (which supports M optical ports maximally, M is generally an integer multiple of N), in addition, the multi-channel OTDR polling monitoring is coupled to the system through WDM, the performance monitoring management of M optical cable fiber cores is completed, any one path of the local equipment service port can be connected to any one of the M fiber cores of the line optical cable, and because the right side is formed by 1: port expansion by an M/N optical switch is performed in a 1: the COM port of the M/N optical switch is a possible blocking point, and the blocking is required to be avoided through proper redundancy and reasonable scheduling, wherein the N: taking an M non-blocking optical cross matrix as N: the submodule of the M OXC realizes that N: n is not blocked and crossed, and then a plurality of optical switches with low order (M/N) are cascaded, so that the line port scheduling and the N: the protection function requirement of the M optical line is higher in reliability compared with the traditional protection of 1+1OLP, and the protection ratio of 1: the M/N MEMS optical switch comprises M/N +1 terminal tail fibers, wherein one terminal tail fiber is set as an input end, and the other terminal tail fibers of No. 1-M/N are set as output ends.
The second embodiment:
as shown in fig. 1 and 2, this embodiment should be understood to at least include all the features of any one of the foregoing embodiments, and further improve on the same, and in particular, provide an asymmetric resistive low-cost optical line protection monitoring system, which includes N: the optical line protection system comprises an M optical line protection system and an NMS network management system, wherein the N: M optical line protection system is connected with the NMS network management system, and the N: M optical line protection system comprises a local equipment service port, an N: m non-blocking optical cross matrix, N1: M/N MEMS optical switch, optical cable line port, M WDM, 1: m MEMS optical switch and OTDR module, wherein M and N are integers from 1 to N, M is more than N, M is integral multiple of N, and N: n light beams are arranged in the M non-blocking light cross matrix, and the number of the light beams is 1: n service ports formed by M first MEMS optical switches and a plurality of M1: m line optical cable fiber core interfaces formed by M second MEMS optical switches are connected with a line optical cable fiber core on each line optical cable fiber core interface, a WDM module is arranged on each line optical cable fiber core, and the line optical cable fiber core is connected with a power supply through the WDM module and the power supply of the 1: the third MEMS optical switch of M is coupled, and the third MEMS optical switch is connected to the OTDR module, specifically, an optical line protection system is implemented based on a 2D MEMS optical switch, so as to implement intelligent scheduling between optical distribution ports, and manual on-site jumper connection is not required, so that timeliness is good, efficiency is higher, and manual jumper connection errors can be avoided, in this embodiment, N is implemented in a manner of cascade connection of an asymmetric structure and a multi-stage optical switch: the M optical line protection system is combined with the use of unified NMS network management, and the functional requirements of manual scheduling or automatic protection switching of the optical distribution line ports are realized at lower cost. Compared with the conventional 1+1olp system, the method has more protection resources and higher reliability, and in the embodiment, N: the M optical line protection system is combined with multi-channel optical cable performance monitoring, not only can switch services to a standby fiber core when an optical cable line fails, but also has the function of monitoring the performance of the fiber core of the optical cable, more efficiently manages optical fiber resources, and can perform priority selection according to the tested performance of the fiber core of the current optical cable during protection switching. The functions are more perfect, and the user experience is better.
The soil loosening mechanism comprises a first supporting plate 3, the top of the first supporting plate 3 and the bottom bolt of the fixed plate 1, the rotating roller 4 is connected between the first supporting plate 3 in a rotating mode, a soil loosening head 5 is bolted on the surface of the rotating roller 4, a first motor 6 is bolted on one end of the rotating roller 4, the first motor 6 and the surface bolt of the first supporting plate 3 are connected, a first protective shell 7 is bolted on the surface of the first supporting plate 3, the first motor 6 is located inside the first protective shell 7, a protective cover 8 is bolted between the first supporting plate 3, the protective cover 8 is located on the top of the rotating roller 4, the first motor 6 rotates to drive the rotating roller 4 to rotate through the soil loosening mechanism, the rotating roller 4 rotates to drive the rotation of the soil loosening head 5, the soil loosening head 5 rotates to turn soil, so that the purpose of loosening soil is achieved, the soil loosening efficiency is improved, the soil loosening efficiency is saved, and the manpower is reduced in planting cost.
The network management system realizes the monitoring and management of the optical line protection system, and the switching can be manually completed through the network management or automatically completed according to a specified strategy.
And N: one side port of the M optical line protection system is connected with an equipment service port (which supports N optical ports maximally) of the local station, the other side is connected with an optical cable line port (which supports M optical ports maximally, M is generally an integral multiple of N), and in addition, the multi-channel OTDR polling monitoring is coupled to the system through WDM, so that the performance monitoring management of fiber cores of M optical cables is completed.
Any path of the local equipment service port can be connected to any one of the M cores of the line optical cable, since the right side is formed by 1: port expansion by an M/N optical switch is performed in a 1: the COM port of the M/N optical switch is a possible blocking point, and the blocking is required to be avoided through proper redundancy and reasonable scheduling.
And N: taking an M non-blocking optical cross matrix as N: the submodule of the M OXC realizes that N: n is not blocked and crossed, and then a plurality of optical switches with low order (M/N) are cascaded, so that the line port scheduling and the N: the requirement of the M optical line protection function is higher in reliability compared with the traditional 1+1OLP protection.
The following steps of 1: the M/N MEMS optical switch comprises M/N +1 terminal tail fibers, wherein one terminal tail fiber is set as an input end, and the other terminal tail fibers of No. 1-M/N are set as output ends.
To sum up, realize the optical line protection system based on 2D MEMS photoswitch, realize the intelligent scheduling between the optical distribution line port, need not artifical scene jumper connection, the ageing is good, efficiency is higher and can avoid artifical jumper connection error, adopts asymmetric structure and multistage photoswitch cascaded mode to realize N: the M optical line protection system is combined with the use of unified NMS network management, and the functional requirements of manual scheduling or automatic protection switching of the optical distribution line ports are realized at lower cost. Compared with the conventional 1+1OLP system, the method has more protection resources and higher reliability, and the method comprises the following steps of: the M optical line protection system is combined with multi-channel optical cable performance monitoring, the business can be switched to a standby fiber core when an optical cable line breaks down, the function of monitoring the performance of the fiber core of the optical cable is achieved, optical fiber resources are managed more efficiently, priority selection can be conducted according to the performance of the tested fiber core of the current optical cable during protection switching, the function is more complete, and user experience is better.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications can be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples. Various configurations may omit, substitute, or add various procedures or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described, and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.
Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.
In conclusion, it is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is illustrative only and is not intended to limit the scope of the invention. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (6)
1. An asymmetric optical line protection monitoring system with resistance and low cost is characterized in that: the method comprises the following steps: m optical line protection system and NMS network management system, wherein N: the M optical line protection system is connected with the NMS network management system, and the N: M optical line protection system comprises a local equipment service port and N: m non-blocking optical cross matrix, N1: M/N MEMS optical switch, optical cable line port, M WDM, 1: m MEMS optical switch and OTDR module, wherein M and N are integers from 1 to N, M is more than N, M is integral multiple of N, and N: the inside of the M non-blocking optical cross matrix is provided with a plurality of N1: n service ports formed by M first MEMS optical switches and a plurality of M1: m line optical cable fiber core interfaces formed by M second MEMS optical switches are connected with a line optical cable fiber core on each line optical cable fiber core interface, a WDM module is arranged on each line optical cable fiber core, and the line optical cable fiber core is connected with a power supply through the WDM module and the power supply of the 1: and the third MEMS optical switch of the M is coupled and is connected with the OTDR module.
2. An asymmetric, resistive, low cost olt protection monitoring system as defined in claim 1, wherein: the network management system realizes the monitoring and management of the optical line protection system, and the switching can be manually completed through the network management or automatically completed according to a designated strategy.
3. An asymmetric, resistive, low cost olt protection monitoring system as defined in claim 1, wherein: and N: one side port of the M optical line protection system is connected with an equipment service port (the maximum supports N optical ports) of the local station, the other side port is connected with an optical cable line port (the maximum supports M optical ports, M is generally an integral multiple of N), and in addition, multi-channel OTDR polling monitoring is coupled to the system through WDM to complete performance monitoring management of fiber cores of M optical cables.
4. An asymmetric, resistive, low cost olt protection monitoring system as defined in claim 1, wherein: any path of the local equipment service port can be connected to any one of the M cores of the line optical cable, since the right side is formed by 1: port expansion by an M/N optical switch is performed in a 1: the COM port of the M/N optical switch is a possible blocking point, and the blocking needs to be avoided through proper redundancy and reasonable scheduling.
5. An asymmetric, resistive, low cost olt protection monitoring system as defined in claim 1, wherein: and N: taking an M non-blocking optical cross matrix as N: the submodule of the M OXC realizes that N: n is crossed without blocking, and then a plurality of optical switches with low orders (M/N) are cascaded, so that the line port scheduling and the N: the M optical line protection function requirement is higher in reliability compared with the traditional 1+1OLP protection.
6. An asymmetric, resistive, low cost olt protection monitoring system according to claim 1, characterized by: the following steps of 1: the M/N MEMS optical switch comprises M/N +1 terminal tail fibers, wherein one terminal tail fiber is set as an input end, and the other terminal tail fibers of No. 1-M/N are set as output ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211237826.0A CN115801113A (en) | 2022-10-10 | 2022-10-10 | Asymmetric optical line protection monitoring system with resistance and low cost |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211237826.0A CN115801113A (en) | 2022-10-10 | 2022-10-10 | Asymmetric optical line protection monitoring system with resistance and low cost |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115801113A true CN115801113A (en) | 2023-03-14 |
Family
ID=85432733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211237826.0A Withdrawn CN115801113A (en) | 2022-10-10 | 2022-10-10 | Asymmetric optical line protection monitoring system with resistance and low cost |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115801113A (en) |
-
2022
- 2022-10-10 CN CN202211237826.0A patent/CN115801113A/en not_active Withdrawn
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6631134B1 (en) | Method for allocating bandwidth in an optical network | |
| AU667219B2 (en) | High speed facility protection in digital telecommunication system | |
| AU669530B2 (en) | Group facility protection in digital telecommunication system | |
| US8953936B2 (en) | Method for protection of multi-wavelength passive optical network | |
| US20060159233A1 (en) | Re-arrangeable analog electrical cross connect | |
| US5912960A (en) | Method and apparatus for remotely activating services in a telecommunications network | |
| WO2003081826A2 (en) | Supervisory channel in an optical network system | |
| CA2673252A1 (en) | Network fault detection and protection switching | |
| WO2002030013A2 (en) | Private network link verification procedure in free space optical communication network | |
| KR102585840B1 (en) | Active patch panel and integrated data distribution system using the same | |
| JP2002500468A (en) | Methods and systems for recovering matching lines and equipment failures. | |
| CN113067660B (en) | Semi-active wavelength division multiplexing system | |
| CN105190386A (en) | Method for crosstalk and power optimization in silicon photonic based switch matrices | |
| Cheng et al. | Reliable and cost efficient passive optical interconnects for data centers | |
| CN100551090C (en) | The circuit-switched method and the device of intelligence distributing frame | |
| US20110164622A1 (en) | Operation and construction method of network using multi-rate interface panel | |
| CN212875802U (en) | N: M blocked optical line protection system with multi-channel performance monitoring function | |
| JP4375882B2 (en) | How to reroute digital signals in your station | |
| CN115801113A (en) | Asymmetric optical line protection monitoring system with resistance and low cost | |
| CN1665174A (en) | Apparatus for providing node protection in optical network and implementing method thereof | |
| CN115603801A (en) | All-optical cross device and wavelength selection switch | |
| CN218603576U (en) | Remote unit protection system | |
| CN1750495A (en) | Optical fiber access net and its communication protecting method | |
| CN212875803U (en) | One kind of N: m non-blocking optical line protection system with multi-channel performance monitoring | |
| CN101998178A (en) | Shared protection control method and device of optical data unit (ODU) loop |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20230314 |
|
| WW01 | Invention patent application withdrawn after publication |