JP2012015966A - Network maintenance/management method and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network maintenance/management method and system, which collect performance information even among nodes where no electric termination processing is performed, can be applied to a mesh network containing an optical node with 3 routes or more, and enables a management in a network containing a node where no electric termination is performed by utilizing the performance information in an existing management system.SOLUTION: This system additionally records the performance information measured at each relay node on an OSC component of an optical signal, mixes it with main signal components to transfer and manages the performance information of each section at an optical termination unit for the optical signal. Moreover, when there are 3 routes or more to connect to an optical node unit, the performance information is transferred along the route of each connected destination of a plurality of optical wavelength channels constituting an optical signal.

Description

  The present invention relates to a performance management and alarm monitoring method in an optical node device and an optical transparent network, and in particular, in an optical transparent network that does not use electrical termination processing on the way, management of communication quality, and each optical node device and optical repeater. The present invention relates to the normality management of the devices constituting the network and the like, and the efficiency of the identification of the failure location at the time of failure.

  In order to make the optical network more economical, research and development of a transparent network that eliminates electrical termination processing in an optical node device is progressing. These are intended to transfer an optical signal to a target point without converting it into an electric signal in order to reduce the overall apparatus cost and power consumption. Recently, ROADM (Reconfigurable Optical Add-Drop Multiplexer) has been introduced commercially, and has contributed to the economy widely.

  On the other hand, however, these optical node devices do not perform electrical termination processing, and thus some problems have been pointed out. Until now, in order to realize OAM (Operation, Administration, and Maintenance), for example, in the OTN (Optical Transport Network) standard and its family of recommendations specified in Non-Patent Document 1, details for realizing carrier grade service OAM related technology is defined. In order to use these functions, it is necessary to electrically terminate the OTN signal, and the various functions defined on the OTN frame can be utilized only after performing the electrical termination processing. Therefore, almost all of these rich OAM functions cannot be used in a transparent network that does not perform electrical processing.

  As a result, the OAM function can be used only at the endpoints that perform electrical termination, but it is difficult to utilize effective performance information and alarm information at intermediate nodes.

  On the other hand, as an alternative to these OAM functions, in optical node devices, optical power and other analog information is obtained by measurement, and studies are being conducted to identify fault locations using that information (for example, Non-patent document 2).

ITU-T Recommendation G. 709 "Interfaces for the Optical Transport Network (OTN)". "Failure Location Algorithm for Transparent Optical Networks", Carmen Mas, IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 23, NO. 8, AUGUST 2005.

  However, in these methods, the acquired analog information is processed in various ways and used to isolate the failure location. However, the information is obtained directly from each node and processed, and systematically transferred. The method has not been studied. With the expansion of the optical network scale, the method of aggregating all information from all nodes has limitations in terms of information congestion and processing operation, and has limited scalability. In addition, the method of systematically managing information by defining information as an alarm has not been studied, which is an operational problem.

  As described above, in an optical transparent network composed of optical node devices that do not use electrical termination processing, conventionally, communication quality management, devices such as each optical node device and optical repeater, etc. When managing performance and isolating faults, each node device was provided with a means to monitor optical signal performance information, and its status was managed individually. Ensuring scalability that can cope with the increase in scale and the increase in the number of nodes has been an issue. Furthermore, there has been a problem of an explosive increase in monitoring network traffic due to an increase in management information from these many nodes and an increase in the load on a system for managing the traffic.

  The present invention has been made in view of the above points, collects performance information even between nodes that do not perform electrical termination processing, and can also be applied to a mesh network including optical nodes having more than three routes. It is an object of the present invention to provide an optical node device and a performance management and alarm monitoring method in an optical transparent network that can manage a network including a node that does not perform termination processing.

  In order to solve the above problems, in the first and ninth inventions, in the transparent network including the optical node device that does not use electrical termination processing and the optical transmission means that propagates the optical signal, the optical signal is parallel to the optical signal. And the performance information measuring means for monitoring the performance information of the optical signal is provided in the optical node device. The performance information obtained by the performance information measuring means is added to the performance information obtained by terminating the performance information channel running in parallel with the optical signal, and the performance information channel is generated by the performance information channel generating means. The performance information is transferred to the node that performs electrical termination processing by repeating these operations in parallel with the optical signal sent downstream. By passing in the node performing management receives the information to the electrical management system, in addition to the conventional electrically terminated interval can be similarly managed and monitored also section to be transferred transparently.

  This enables scalable and simple performance information management and alarm monitoring in an optical transparent network in which optical node devices that do not use electrical termination processing and optical node devices that use electrical termination processing coexist.

  In the second and tenth inventions, in the optical node device that does not use electrical termination processing, the performance information performance information measuring means is arranged on the input side and the output side of the optical node device, so that the optical node device By adding multiple pieces of performance information to the performance information from upstream, it is possible to efficiently manage both the performance information of the optical transmission part and the performance information of the optical node device itself.

  Further, in the third and eleventh inventions, at least one or more of the optical node devices that do not use the electrical termination processing are previously set to have one or more threshold values in accordance with the characteristics of the transparent network. When a value exceeding the threshold is set, alarm information is generated at the node in addition to the performance information, and this is transferred to the performance information channel, enabling the rapid identification of the abnormal range. To do.

  Further, in the fourth and twelfth inventions, in relation to the third and eleventh inventions, the optical node device is located downstream along the propagation direction of the optical signal from the optical node device that detects the deviation from the threshold value of the performance information. When the alarm information is not generated in the optical node device that performs electrical processing, it is possible to prevent unnecessary alarm information from occurring by masking the alarm information in the optical node device that does not use the electrical processing.

  Further, in the fifth and thirteenth inventions, in relation to the third and eleventh inventions, the optical node device is located downstream along the propagation direction of the optical signal from the optical node device that detects the deviation from the threshold value of the performance information. By masking alarm information generated in the optical node device, it becomes possible to prevent a situation in which it is difficult to identify an abnormal section due to unnecessary alarm information.

  Further, in the sixth and fourteenth inventions, when the number of paths connected to the optical node device is 3 or more, the performance information is provided along connection destination paths of each of the plurality of optical wavelength channels constituting the optical signal. , The performance information can be managed for each optical wavelength channel having a different path.

  In the seventh and fifteenth inventions, the optical node device is provided with electrical cross-connect means, and the performance information / monitoring information is switched as overhead information, so that the management / monitoring information of the transparent section is also the electrical section. Since it is transferred without change, both sections can be managed and monitored seamlessly without being separated.

  In the eighth and sixteenth inventions, as the signal management information part of the electrical management device for inputting the performance information, the TCM and / or GCC of the ODU frame defined by ITU-T G.709 is used. Thus, since necessary performance information is held on the ODU frame, it is possible to immediately determine the ODU path that has an influence when a failure occurs.

  The present invention defines a method of systematically describing performance information obtained in each optical node device in a performance information channel that runs in parallel with the main signal, and repeats this in each optical node device to perform electrical termination processing. In addition to the conventional electrical management information, the node that transfers to the optical node device and performs the electrical termination process can manage scalable and smooth performance information even when the number of optical node devices increases It is. As a result, the optical node device that does not use electrical termination processing and the optical node device that performs electrical termination processing can be managed in a unified manner. Further, the present invention can also be applied to a mesh network including optical node devices having three or more routes. Furthermore, by utilizing the performance information in an existing management system, it can be applied to a network including an optical node device that does not perform electrical termination processing. It is also possible to comprehensively manage optical paths that span different domains.

1 is a basic configuration diagram of a network according to a first embodiment of the present invention. 1 is a basic configuration diagram of an optical node device according to a first embodiment of the present invention. It is an example of the performance information management table in the 1st Embodiment of this invention. It is a basic composition figure (in the case of a plurality of monitors) of the optical node device in the 2nd Embodiment of this invention. It is an example of the performance information management model in the optical node apparatus in the 2nd Embodiment of this invention. It is an example of the alarm monitoring model in the 3rd Embodiment of this invention. It is an example of an alarm monitoring model (no masking: for example, optical power) in the third embodiment of the present invention. It is an alarm monitoring model example (alarm issue masking) in the fourth embodiment of the present invention. It is an alarm monitoring model example (with masking, for example, OSNR) in the fifth embodiment of the present invention. It is a basic block diagram in the case of 3 visits or more in the 6th Embodiment of this invention. It is an operation example in the case of three or more paths in the sixth embodiment of the present invention. It is a figure which shows the effect at the time of the electrical node (ODU-XC part) passage in the 7th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment]
The present embodiment is an example of the performance / alarm information transfer method and management method in the transparent network corresponding to claims 1 and 9.

FIG. 1 shows a basic network configuration according to the first embodiment of the present invention. In the section of the optical path to electrically optical signal generated from the end to device 10 ₁ is received by apparatus 10 ₂ which terminates an optical signal, in the example of this embodiment, eight transparent optical node device Assumed. First, consider the case where the light signal generated from the optical path termination unit 10 ₁ is input to the optical node device 1.

  FIG. 2 is a basic configuration diagram of the optical node device according to the first embodiment of the present invention.

  For the description of the present invention, an OSC (Optical Supervisory Channel) demultiplexing unit 21, a multiplexing unit 22, an optical switch function unit or an optical amplification function unit 23, a performance information measurement unit 231, an OSC termination unit 25, and an OSC processing unit 26 and the optical node device 20 including the OSC generation unit 27 will be described as an example.

  First, an optical signal is received as an input, and an OSC signal component is extracted from the optical signal by the OSC branching unit 21.

  The extracted OSC signal component is converted into an electric signal by the OSC termination unit 25. The OSC signal component converted into the electric signal is input to the OSC processing unit 26, and the performance information management table is developed therein.

  On the other hand, the optical power, OSNR (Optical Signal to Noise Ratio), etc. are measured by the performance information measuring unit 231 from the optical signal input to the optical switch function unit or the optical amplification function unit 23, and the obtained performance information is It is transferred to the OSC signal processing unit 26. These pieces of performance information are acquired on the input side or output side of the optical switch function unit or optical amplification function unit 23.

  In the OSC processing unit 26, the performance information newly obtained as described above is added to the performance information management table developed in the internal storage area as shown in FIG. The added information in the performance information management table is reconstructed into an OSC signal component as an electrical signal and input to the OSC generation unit 27. The OSC generation unit 27 converts the input OSC signal component as an electrical signal into an OSC signal component as an optical signal.

  In the OSC multiplexing unit 22, the OSC signal component output from the OSC generation unit 27 and the main signal output from the optical switch function unit or the optical amplification function unit 23 are combined and output toward the optical transmission line. .

The above series of operations is executed in each optical node device. By repeating such an operation, the performance information is transferred toward the downstream optical node device. This performance information is eventually passed through the eighth optical node device, as shown in FIG. 1, it is terminated at the optical node device 10 ₂ for electrical termination. The terminated performance information is further transferred to the TCM (Time Compression Multiplex) part or GCC (General communication Channel) part of the OTN as electrical management information.

  In the optical termination device using the electrical termination processing, performance information and the like are managed by the conventional technique, but the obtained performance information can be obtained only at both ends where the optical termination device using the electrical termination processing is placed. The information transferred in the configuration shown in the example of the present embodiment provides performance information for a section configured by an optical node device that does not use electrical termination processing, which was not obtained in the prior art. By using this performance information in addition to the prior art, it becomes possible to quickly and scalablely identify abnormal portions in the section shown in FIG.

[Second Embodiment]
The present example is an example of a performance / alarm information transfer method and management method in the transparent network based on the first embodiment, and corresponds to claims 2 and 10.

  FIG. 4 is a basic configuration diagram of an optical node device according to the second embodiment of the present invention. In the figure, the same components as those in FIG.

  The present embodiment is characterized in that a plurality of performance information measurement units (performance information measurement units 231 and 232) are installed in the optical node device that does not perform electrical termination processing in the first embodiment described above. In the first embodiment, the performance information is measured on the input side or the output side of the optical switch function unit or the optical amplification function unit 23. In this configuration, the optical switch function unit or the optical amplification function is used. The performance information is acquired for both the input and output sides of the unit 23.

  With this configuration, it becomes possible to obtain performance information before and after the optical switch function unit or optical amplification function unit 23 of the optical node device 20, and an abnormality in the optical switch function unit or optical amplification function unit 23 of the optical node device can be obtained. Information about the presence or absence can also be obtained. This is shown in FIG.

  In this way, in addition to the optical transmission line portion, the performance information in the optical node device can be obtained independently of the optical transmission line portion, so that it is possible to more precisely identify performance degradation and abnormality.

[Third Embodiment]
The present embodiment corresponds to claims 3 and 11.

  In the present embodiment, in addition to the performance information obtained by the OSC processing unit 26 in the configurations described in the first and second embodiments, threshold values for making an abnormality determination for these performance information values are set in advance. It is characterized by that. This operation is shown in FIGS. When the performance information value deviates from the margin area shown in the figure, an alarm is issued from the performance information measuring unit 231 of the optical node device. That is, when the value of the performance information deviates from the threshold value, an alarm for notifying abnormality can be issued. As a result, it is possible to actively notify the abnormality from the apparatus itself, and the service maintainability can be improved as a whole. An example of analog information to be transferred as shown in FIG. 7 is optical power.

[Fourth Embodiment]
This embodiment is related to the third embodiment and corresponds to claims 4 and 12.

  FIG. 8 is an alarm monitoring model example (alarm issue masking) in the fourth embodiment of the present invention.

The present embodiment is characterized in that it has a function of suppressing an alarm issued in the third embodiment. In the present embodiment, as shown in FIG. 8, alarm generation status in the optical node device that performs electrical processing arranged downstream is collected through the performance information channel that propagates in the opposite direction in the performance information measurement unit 231, If the alarm is not issued in the optical node device that performs the electrical processing, the alarm information issuance is suppressed in the optical node device that does not perform the electrical processing. The state of this operation is shown in FIG. Since in the example of FIG alarm in termination device 10 ₂ for electrical processing has not been issued, and suppresses the alarms issued in the optical node device 1 does not perform electrical processing.

  As a result, it is possible to prevent the occurrence of confusion by generating unnecessary alarm information when there is no problem in the entire system.

[Fifth Embodiment]
This embodiment relates to the third embodiment and corresponds to claims 5 and 13.
FIG. 9 shows the basic operation in the present embodiment. In the present embodiment, in the third embodiment described above, the performance information measuring unit 231 masks an alarm issued from an upstream node. In the case of the configuration in the above embodiment, a similar error may occur in a downstream node due to an abnormality that has occurred in a certain node (upstream). For example, when the signal-to-noise ratio deteriorates at a certain node, the same alarm is inevitably generated at the subsequent nodes. Therefore, a large number of alarms are issued for one cause of the abnormality, which is likely to cause confusion during maintenance, and it takes time to investigate the cause. In the present embodiment, when an abnormal value at a certain node has a characteristic of clearly propagating downstream as in the above example, similar alarm is suppressed on the downstream side. The state of this operation is shown in FIG. In the example of FIG. 9, a margin excess occurs in the optical node device 1, an alarm is generated, and the alarm is suppressed in the optical node device 2 downstream of the optical node device 1.

  Thereby, a quicker and more accurate abnormal section identification can be realized. An example of analog information that needs to be subjected to alarm masking as shown in FIG. 9 is optical OSNR. The optical power of the above embodiment has the characteristic that the deviation on the upstream side is shielded by the control of each optical amplifier constituting the section, and there is little fear of spreading to the downstream, so masking etc. are unnecessary. Since the optical OSNR in the form of (1) decreases once, it cannot be expected to recover in the transparent section, so masking is necessary.

[Sixth Embodiment]
This embodiment corresponds to claims 6 and 14.

  As shown in FIG. 10, in the configuration of the first to fifth embodiments, the present embodiment is configured so that the optical switch function unit or The optical amplification function unit 23 is characterized in that the performance information is switched along the path of the optical signal.

  The operation is shown in FIG. In the example of the figure, a case where the O-ch 1 and the O-ch 2 are switched to different paths in the node 7 is shown. In this case, in the performance information management table, a portion corresponding to O-ch 1 is switched to the route A, and a portion corresponding to O-ch 2 is switched to the route B. With this operation, each O-ch can be managed consistently from the start point to the end point of the path. This function makes it possible to quickly identify the affected area of an abnormality or failure.

[Seventh Embodiment]
This embodiment corresponds to claims 7 and 15.

  In the present embodiment, as shown in FIG. 12, in the first to sixth embodiments, the optical node device 50 internally converts an optical signal into an electrical signal and processes it. A type cross-connect unit 51 is provided, and performance information / monitoring information is switched as overhead information.

  Thereby, since the management / monitoring information of the transparent section is also transferred without changing from the electric section, it is possible to seamlessly manage and monitor both sections without being separated.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made within the scope of the claims.

DESCRIPTION OF SYMBOLS 10 Optical path (O-ch) termination device 20, 30, 40, 50 Optical node device 21 OSC branch part 22, 41 OSC multiplexing part 23 Optical switch function part or optical amplification function part 25 OSC termination part 26 OSC processing part 27 OSC generation part 51 ODU-XC part 231,232 Performance information measurement part

Claims (16)

A network maintenance / management method in an optical transparent network composed of an optical node device that does not use electrical termination processing and an optical transmission means that propagates an optical wavelength division multiplexing optical signal composed of a plurality of optical wavelength channels,
In the optical node device that transmits the performance information channel of the optical signal in parallel with the optical signal, the performance information channel termination unit, the performance information channel processing unit, the performance information channel generation unit, and the performance of monitoring the performance information of the optical signal Comprising information performance information measuring means,
The performance information acquired by the performance information performance information measuring means is added to the performance information obtained by terminating the performance information channel processed in parallel with the upstream optical signal by the termination means. Outputting the added performance information A to the performance information channel generating means;
The performance information channel generating means generates a performance information channel from the performance information A, and sends it in parallel with an optical signal to the downstream side;
The network maintenance / management method is characterized in that the performance information is transferred to a node that performs electrical termination processing by repeating and the performance information is input to the signal management information portion of the electrical management device at the electrical processing node . The performance information performance information measuring means is arranged on the input side and the output side of the optical node device,
The network maintenance / management method according to claim 1, wherein a plurality of pieces of performance information per optical node device are added to the performance information from upstream. In at least one or more optical node devices,
When the performance information performance information measuring unit exceeds a preset threshold value, the performance information performance information generation unit generates alarm information in the node in addition to the performance information, and transfers the alarm information to the performance information channel. Item 3. The network maintenance / management method according to item 1 or 2. In an optical node device that does not use electrical processing,
The performance information performance information measuring means reverses the alarm state of the optical node device using electrical processing downstream along the propagation direction of the optical signal, rather than the optical node device detecting the deviation from the threshold value of the performance information. 4. The network maintenance according to claim 3, wherein the alarm information is masked in the optical node device not using the electric processing when the warning information is not detected in the optical node device using the electric processing. ·Management method. The performance information performance information measuring means masks alarm information generated in an optical node device downstream along the propagation direction of an optical signal from an optical node device that detects a deviation from the threshold value of the performance information. The network maintenance / management method according to Item 3. When the number of paths connected to the optical node device is 3 or more, the performance information performance information measuring means, along the connection destination path of each of a plurality of optical wavelength channels constituting the optical signal, the performance information, Alternatively, the network maintenance / management method according to claim 1, wherein alarm information is transferred.   6. The network maintenance / management method according to claim 1, wherein electrical cross-connect means in the optical node device performs switching while holding the performance information or the monitoring information as overhead information. 8. The TCM and / or GCC of an ODU frame defined by ITU-T G.709, or both are used as a signal management information part of an electrical management apparatus that inputs the performance information. Network maintenance and management methods. An optical transparent network composed of an optical node device that does not use electrical termination processing and an optical transmission means that propagates an optical wavelength division multiplexing optical signal composed of a plurality of optical wavelength channels,
The optical node device that transmits the performance information channel of the optical signal in parallel with the optical signal includes the performance information channel termination unit, the performance information channel processing unit, the performance information channel generation unit, and the performance of monitoring the performance information of the optical signal. An information measuring means,
The performance channel processing means includes:
Means for appending the performance information obtained by the performance information measuring means to the performance information obtained by terminating the performance information channel running in parallel with the upstream optical signal by the termination means;
The performance channel generation means includes
A network maintenance / management system comprising means for generating a performance information channel from performance information to which performance information has been added, and transmitting it in parallel with an optical signal downstream. The optical node device is:
10. The network maintenance / management system according to claim 9, wherein the performance information performance information measuring means is arranged on an input side and an output side of the optical node device. In at least one or more of the optical node devices, the performance information performance information measuring unit includes:
The network according to claim 9 or 10, further comprising means for generating alarm information in addition to the performance information and transferring it to the performance information channel when a value of the performance information exceeding a preset threshold is obtained. Maintenance and management system. The performance information performance information measuring means,
Confirm the alarm status of the optical node device that uses electrical processing downstream along the propagation direction of the optical signal in the performance information channel that propagates in the reverse direction, rather than the optical node device that detected the deviation from the threshold value of the performance information. 12. The network maintenance / management system according to claim 11, further comprising means for masking alarm information when alarm information is not detected in the optical node device using the electrical processing. The performance information performance information measuring means,
12. The network maintenance according to claim 11, further comprising means for masking alarm information generated in an optical node device downstream along the propagation direction of an optical signal from an optical node device that detects a deviation from the threshold value of the performance information. -Management system. When the number of paths connected to the optical node device is 3 or more, switching means for transferring the performance information or the alarm information along connection destination paths of each of the plurality of optical wavelength channels constituting the optical signal is provided. The network maintenance / management system according to claim 9, comprising: The network maintenance / management system according to claim 9, further comprising an electrical cross-connect unit configured to perform switching while holding the performance information and the monitoring information as overhead information. 16. The TCM or GCC of an ODU frame defined by ITU-T G.709, or both are used as a signal management information part of an electrical management device that inputs the performance information to the optical node device. The network maintenance / management system according to claim 1.

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