JP5722167B2 - Fault monitoring determination apparatus, fault monitoring determination method, and program - Google Patents

Description

  The present invention relates to a transmission line monitoring technique, and in particular, specifies a faulty part of a communication system that implements a transmission method using a multilane distribution technique such as 40/100 Gbps Ethernet (“Ethernet” is a registered trademark). It is about the technology to do.

  40 Gbps and 100 Gbps Ethernet (referred to as 40/100 Gbps, etc.) are standardized as IEEE 802.3ba. In 40/100 GbE standardized by IEEE 802.3ba, an Ethernet signal (hereinafter referred to as an ETH signal) is divided into a plurality of bit streams to perform multi-lane distribution (MLD) and wavelength multiplexing. Signal transmission is performed by the method. In addition, there is a method of performing signal transmission divided into a plurality of optical fibers. Below, the case where a wavelength multiplexing system is used is demonstrated as an example.

  With reference to FIG. 1, a transmission system of 100 GbE will be described as an example. On the transmission side, the ETH signal is divided into 20 lanes in blocks of 66 bits by 64 / 66B encoding. This lane is called a PCS (Physical Coding Sublayer) lane. In addition, in the case of 40 GbE, it distributes to four PCS lanes. Thereafter, bit multiplexing (2-bit-MUX) is performed. The processing so far is performed by a line card including a MAC chip.

  After that, a signal is sent from the line card to the optical module via the CAUI (XLAUI in 40GbE) which is an interface between the line card and the pluggable optical module (hereinafter referred to as “optical module”), and the optical module performs bit multiplexing. The four wavelengths are multiplexed and signal transmission is performed using an optical fiber. On the receiving side, processing opposite to that on the transmitting side is performed to generate an ETH signal. Here, the accommodation (mapping) of each PCS lane to each wavelength λ can be arbitrarily set.

  In the parallel transmission distributed to a plurality of lanes as described above, a skew that causes the block position to shift during transmission occurs. Therefore, in 40/100 GbE, as shown in FIGS. 1 and 2, an alignment marker (AM) is inserted into each PCS lane at a fixed interval on the transmission side, and the skew of each PCS lane is set on the reception side. It is adjusted.

  Further, in the PCS layer, it is possible to detect a lane-by-lane failure, detect a lane-by-lane BIP (bit interleaved parity) error by AM, and monitor an inter-lane skew adjustment error. Note that the inter-lane skew adjustment state is also referred to as a PCS synchronization state.

Japanese Patent Laid-Open No. 2003-018159

  As described above, the PCS layer monitoring function implemented in 40/100 GbE can detect lane-by-lane failure detection and inter-lane skew adjustment errors. However, although this PCS layer monitoring function can determine the presence / absence of a failure in each PCS lane, for example, whether the failure is caused by a transmission line failure or a wavelength λ failure is specified. Can not. That is, the detected failure cannot identify any of a line card failure, an optical module failure, or a transmission path failure. As described above, the conventional PCS layer monitoring function cannot detect a fault other than the PCS layer, and therefore cannot specify a fault site or fault state in a communication system implementing 40/100 GbE.

  The present invention has been made in view of the above points, and performs signal transmission using a transmission system configured by hierarchically connecting a plurality of lane aggregates composed of one or a plurality of lanes for transmitting signals. It is an object of the present invention to provide a technique for identifying a fault site or fault state in a communication system to be performed.

In order to solve the above-described problems, the present invention is a communication that performs signal transmission using a transmission scheme configured by hierarchically connecting a plurality of lane assemblies including one or a plurality of lanes that transmit signals. A failure monitoring determination device for determining a failure state in a system,
Failure information acquisition means for acquiring failure information in units of lanes in a detection lane assembly that is one lane assembly of the plurality of lane assemblies;
Correspondence information storage means for storing correspondence information in which each lane of the detection lane aggregate and each lane of the other lane aggregate are associated with each other;
Based on the failure information acquired by the failure information acquisition unit and the correspondence information stored in the correspondence information storage unit, another lane assembly corresponding to the lane of the detected lane assembly from which the failure information has been acquired It is configured as a failure monitoring and determination device characterized by comprising failure determination means for performing failure determination on the lanes and determining a site where a failure has occurred based on the result of the failure determination.

  In the failure monitoring determination apparatus, the failure information acquisition unit acquires transmission quality information as one piece of the failure information for each lane in the detection lane assembly, and the failure determination unit includes each of the detection lane assemblies. The transmission quality information of each lane of each other lane aggregate is calculated using the transmission quality information of the lane, and the transmission quality degradation of each lane of each other lane aggregate is calculated based on the calculated transmission quality information. The failure determination may be performed by determining the above.

  In the failure monitoring determination apparatus, the plurality of hierarchically connected lane assemblies include at least the detection lane assembly and the lowest lane assembly in order from an upper layer, and the failure determination unit includes: The failure determination result of each lane of each lane assembly is confirmed in order from the lowest lane assembly to the upper lane assembly, and the lane set of the layer first confirmed to be faulty The corresponding lane of the body may be determined as a damaged part. The failure determination unit includes a case where the failure information in the lane determined as the failure part includes information indicating that transmission quality is deteriorated, and the failure information does not include information indicating that a failure due to an alarm has occurred. The fault state of the faulty part may be determined as transmission quality degradation.

In addition, the present invention determines a failure state in a communication system that performs signal transmission using a transmission method that is configured by hierarchically connecting a plurality of lane aggregates including one or a plurality of lanes that transmit signals. A failure monitoring determination method executed by a failure monitoring determination device for
The failure monitoring determination device stores correspondence information in which each lane of the detection lane assembly, which is one lane assembly of the plurality of lane assemblies, is associated with each lane of the other lane assembly. Corresponding information storage means,
Failure information acquisition step for acquiring failure information in units of lanes in the detected lane assembly;
Other lane aggregates corresponding to the lanes of the detected lane aggregate that acquired the fault information based on the fault information acquired by the fault information acquisition step and the correspondence information stored in the correspondence information storage unit It is also possible to configure as a failure monitoring determination method characterized by including a failure determination step of determining a failure in each lane and determining a site where a failure has occurred based on the result of the failure determination.

  The present invention can also be configured as a program for causing a computer to function as each unit of the failure monitoring determination apparatus.

  According to the present invention, a failure part and a failure state in a communication system that performs signal transmission using a transmission scheme configured by hierarchically connecting a plurality of lane aggregates including one or a plurality of lanes that transmit signals. It is possible to provide a technique for identifying the.

It is a figure for demonstrating the transmission system of 100 GbE. It is a figure for demonstrating the skew adjustment by an alignment marker. It is a figure which shows the hierarchical structure of 100GbE-LR4 / ER4. It is a functional block diagram of the failure monitoring determination apparatus which concerns on this Embodiment. 6 is a flowchart for explaining a processing procedure example 1; It is a figure for demonstrating the process procedure example 1. FIG. It is a figure for demonstrating the process procedure example 2. FIG. It is a figure for demonstrating the process procedure example 3. FIG. It is a figure for demonstrating the process procedure example 4. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, 100 GbE is targeted as an example, but the present invention is not limited to 100 GbE. Of course, it can be applied to 40 GbE standardized in the same way as 100 GbE, and other than these, as in 40/100 GbE, any system that performs signal transmission by distributing multilanes in a higher layer than a physical medium such as an optical fiber. The present invention can be applied.

  FIG. 3 shows a hierarchical configuration of 100 GbE-LR4 / ER4 used in this embodiment as an example. This figure is substantially the same as FIG. 1, but shows the hierarchical structure in a more understandable manner. As shown in FIG. 3, the Ethernet signal is distributed to 20 lanes in the PCS layer, bit multiplexing from 20 lanes to 10 lanes for connection to the CAUI interface in the PMA (Physical Medium Attachment) layer, and Bit multiplexing from 10 lanes to 4 lanes for connection with the PHY (physical) layer is performed, and in the PHY (physical) layer, the four wavelengths corresponding to the four lanes are multiplexed and SMF (single mode) (Optical fiber).

  A communication device that implements 100 GbE includes a line card and an optical module. Among the above processing, distribution to 20 lanes and bit multiplexing from 20 lanes to 10 lanes are processed by the line card, and 10 lanes to 4 lanes. Bit multiplexing and wavelength multiplexing optical transmission into the optical module are processed. The electrical interface between the line card and the optical module is CAUI.

  A “lane” is a path through which a signal flows, but the path is not limited to a logical path or a physical path. The detection lane is a lane for detecting failure information. In this embodiment, the failure information of the PCS lane is detected, and the failure information is determined using the failure information. Also called a detection lane. Note that setting the PCS lane as the detection lane is merely an example.

  The interfaces such as PCS and CAUI, the wavelength λ, and the transmission path are each a lane aggregate composed of one or a plurality of lanes, and these lane aggregates are arranged from the upper layer from the PCS lane toward the transmission path. It is connected to the lower hierarchy in order.

  In the present embodiment, the meaning of “failure” includes transmission quality deterioration and a failure detected by an alarm (referred to as an alarm failure).

(Device configuration)
FIG. 4 shows a functional configuration diagram of the failure monitoring determination apparatus 100 according to the present embodiment. As shown in FIG. 4, the failure monitoring determination device 100 is connected to the communication device 200 or built in the communication device 200 so that various types of information described later can be acquired from the communication device 200 having a 100 GbE communication function. . That is, the failure monitoring determination device 100 may be realized as an NW operation device connected to the communication device 200 via a network, or may be realized as one functional unit in the communication device 200.

  The communication apparatus 200 according to the present embodiment includes at least a function of counting the number of BIP errors in units of PCS lanes, a function of measuring the optical power level of each wavelength, and a function of grasping the fault occurrence state of the PCS layer in units of PCS lanes. ing. The communication device 200 includes a line card and an optical module, and is connected to a transmission path (optical fiber) by the optical module to perform signal transmission / reception. Here, the configuration including the communication device 200 and the transmission path is referred to as a communication system.

  As shown in FIG. 4, the failure monitoring determination apparatus 100 includes an NW quality policy input unit 1, a measurement interval input unit 2, a PCS lane position management table 3, a BIP error number management unit 4, a failure occurrence state management unit 5, a transmission path A quality deterioration counter threshold value calculation unit 6, an error determination unit 7, a failure occurrence state determination unit 8, an alarm notification processing unit 9, an execution instruction unit 10 for a redundancy management unit, and a transmission quality state display unit 11 are provided. In the form in which the failure monitoring determination device 100 is implemented in the communication device 200, any or all of the alarm notification processing unit 9, the execution instruction unit 10 to the redundancy management unit, and the transmission quality state display unit 11 are failed. It is good also as providing in the operation system side, not providing in the monitoring determination apparatus 100 (communication apparatus 200).

  The NW quality policy input unit 1 is a functional unit for inputting an NW quality policy that is a criterion for failure determination. The NW quality policy in the present embodiment is a threshold value for determining whether or not there is an abnormality in a measurement value such as the number of errors at a predetermined measurement interval (determination time).

  The measurement interval input unit 2 is a functional unit for inputting a measurement interval, that is, a time interval for measuring transmission quality deterioration and alarm failure. For example, when the measurement interval is 10 ms, the number of errors every 10 ms (the number of errors generated during 10 ms) and the optical power level are acquired. Note that the time interval and the determination accuracy have a function relationship.

  The PCS lane position management table 3 is a table (database) that stores PCS lane positions set in the monitoring target communication device 200. The table holds the relationship between the wavelength λ, the CAUI interface, and the PCS lane.

  The BIP error number management unit 4 obtains a BIP error number counter value in units of PCS lanes from the communication device 200, thereby calculating the number of errors per measurement interval time in units of PCS lanes and holding the calculated number in a storage unit such as a memory. It is a functional part. In addition, in order to acquire the number of errors per measurement interval time, for example, the counter reset may be performed when the counter value is acquired for the communication apparatus 200, so that the counter value is acquired from the communication apparatus 200 at every measurement interval time. Alternatively, the counter value at the time of previous acquisition may be held, and the difference from the current acquired value acquired after the measurement interval time may be calculated. Further, the communication device 200 may be a device including a read clear type counter.

  The failure occurrence state management unit 5 is a functional unit that periodically acquires the alarm failure occurrence state in units of PCS lanes and the optical power level of each wavelength from the communication device 200 and holds them in the storage unit. In order to acquire the failure information generated at the measurement interval, for example, the communication device 200 has a function of clearing the failure occurrence information latched at the time of information acquisition. The communication device 200 may be a device having read-clear latch information. Further, the failure occurrence state management unit 5 may acquire and hold the PCS synchronization state from the communication apparatus 200.

  The transmission path quality degradation counter threshold calculation unit 6 is a functional unit that calculates a threshold (number of errors) for each PCS lane determined to be transmission quality degradation.

  The error determination unit 7 performs failure determination for four layers (PCS layer, CAUI layer, wavelength λ layer, and transmission path layer). That is, the error determination unit 7 determines “transmission quality deterioration presence / absence” and “alarm failure presence / absence” in units of PCSn (n = 0 to 19 for 100 GbE, n = 0 to 3 for 40 GbE), and the determination result Are managed in PCSn units, and “transmission quality deterioration presence / absence” of the CAUI layer, wavelength λ layer, and transmission path layer are determined using the determination result (BIP error and alarm) and the optical power level of the wavelength λ layer in PCSn units, and Determine whether there is an alarm failure. However, in the technique according to the present invention, it is not essential to use the optical power level of the wavelength λ layer.

  The failure occurrence state determination unit 8 is a functional unit that determines a failure part and a failure state using the determination result of the error determination unit 7. Details of processing by the failure occurrence state determination unit 8 will be described later.

  The alarm notification processing unit 9 is a functional unit that notifies the operator or the like of the fault site and fault status determined by the fault occurrence status determination unit 8 as an alarm.

  The execution instructing unit 10 to the redundancy management unit sends “ACT / SBY selection system switching” and “LAG member down” to the redundancy management unit such as LAG included in the communication device 200 according to the failure part and the failure state. It is a functional unit that instructs execution of “processing”.

  The transmission quality state display unit 11 is a functional unit that displays a response to an information acquisition request regarding transmission quality from an operator. Further, the transmission quality state display unit 11 can display failure information other than the transmission quality.

  The classification of functional units in the failure monitoring determination apparatus 100 is merely an example. Other functional configurations may be employed as long as the same function can be exhibited as a whole. For example, the failure monitoring determination apparatus 100 is configured to detect a failure state in a communication system that performs signal transmission using a transmission method configured by hierarchically connecting a plurality of lane aggregates including one or a plurality of lanes that transmit signals. A failure information acquisition unit (number of BIP errors) for acquiring failure information in units of lanes in a detected lane assembly that is one lane assembly among the plurality of lane assemblies. Corresponding information storage means (table corresponding to the management unit 4 and the failure occurrence state management unit 5), and correspondence information that associates each lane of the detected lane assembly with each lane of each other lane assembly. On the basis of the failure information acquired by the failure information acquisition means and the correspondence information stored in the correspondence information storage means. Failure determination means (error determination unit 7) that determines a failure of a lane of another lane assembly corresponding to the obtained lane of the detected lane assembly and determines a site where the failure has occurred based on the result of the failure determination , Corresponding to the failure occurrence state determination unit 8).

  The failure monitoring determination device 100 can be realized by causing a computer (including the communication device 200 having a configuration including a CPU, a memory, and the like) to execute a program corresponding to processing of each function of the failure monitoring determination device 100. The program may be installed in a computer from a recording medium such as a portable memory, or may be downloaded from a server on the network. In addition, each functional unit of the failure monitoring determination apparatus 100 can be implemented by a hardware circuit.

  Hereinafter, examples of processing procedures executed by the failure monitoring determination apparatus will be described.

(Processing procedure example 1)
First, as a processing procedure example 1 will be described along a processing procedure example relating to fault determination when only the wavelength lambda ₀ fails the procedure shown in the flowchart of FIG. As described above, “failure” includes “transmission quality degradation” and “alarm failure”.

  In the description of the processing procedure example 1, FIG. 6 is also referred to. FIG. 6 is a diagram collectively showing the accommodation state, collected information, determination results, and the like in Processing Procedure Example 1. In the present embodiment, the information shown in FIG. 6 is assumed to be table information indicating the contents of a memory that sequentially stores processing information when the failure monitoring determination apparatus 100 performs processing. The same applies to other processing procedure examples. The table information shown in FIG. 6 may be table information obtained by adding acquired information and determination results to the PCS lane position management table. However, using the table information shown in FIG. 6 in the process executed by the failure monitoring determination apparatus 100 is merely an example. If the data corresponding to the table information shown in FIG. 6 can be associated, the processing can be performed without using the table information as shown in FIG. Hereinafter, processing procedure example 1 will be described.

  Step 101) The NW quality policy input unit 1 inputs parameters relating to the NW quality policy. In the present embodiment, a deterioration determination threshold “1.0E-6” of transmission quality (in this example, a bit error rate indicating how many bits of errors have occurred among the number of transmitted bits), and a wavelength unit power level The lower threshold value “−6.0 dBm” is input. Note that the specific numerical values shown in this embodiment are merely examples.

  Step 102) The measurement interval input unit 2 inputs the measurement interval of the fault occurrence state. In the present embodiment, as an example, the measurement time is “10 ms”.

  Step 103) The position information indicating the relationship between the wavelength λ, the CAUI lane, and the PCS lane is input to the PCS lane position management table 3. The input here may be performed by an operator, or may be automatically acquired from the host OpS or the communication device 200.

  From the PCS lane position information, information indicating the relationship between CAUI (XLAUI for 40G) lane members and PCS lane numbers and the relationship between λ lane members and PCS lane numbers is obtained and stored in the PCS lane position management table 3. The

Information indicating the above relationship is held in the table of FIG. 6 and corresponds to information of PCSn (PCS lane number) and accommodation state (CAUIn, λp) in FIG. This information indicates that, for example, CAUI ₀ and CAUI ₁ are accommodated in the wavelength λ ₀ , PCS ₀ and PCS ₁ are accommodated in CAUI ₀ , and PCS ₂ and PCS ₃ are accommodated in CAUI ₁ . Note that the PCS lane aggregates shown as PCS ₀ to PCS ₁₉ in FIG. 6 are the detection lane aggregates in the present embodiment.

  Step 104) Based on the measurement interval input by the measurement interval input unit 2, the BIP error number management unit 4 acquires a BIP error number counter value for each PCS lane from the communication device 200 for each measurement interval, and the table of FIG. Is recorded in the corresponding PCS lane column of “BIP error count”. That is, the information recorded in this field is updated at every measurement interval. The same applies to other information acquired at the measurement interval.

  Step 105) Based on the measurement interval input by the measurement interval input unit 2, the failure occurrence state management unit 5 obtains “alarm failure information in units of PCS lanes” and “power level in units of wavelength λ” from the communication device 200. Each is acquired and recorded in the corresponding column of PCS failure and λ power level in the table of FIG. In this example, the “PCS synchronization state” is also acquired and recorded.

  Step 106) The transmission path quality degradation counter threshold value calculation unit 6 determines transmission quality degradation in units of PCS lanes from the quality policy input by the NW quality policy input unit 1 and the measurement interval input from the measurement interval input unit 2. The number of errors to be calculated is calculated and input to the error determination unit 7. Here, based on the quality policy = 1.0E-6 and the measurement interval = 10 ms, the number of errors determined as transmission quality deterioration per 1 PCS lane is calculated. In this example, it is calculated as 200 per all PCS lanes (that is, optical fibers), and 10 per 1 PCS lane.

  Step 107) Based on the information acquired up to Step 106, the error determination unit 7 performs a failure determination of each layer (indicated by A to B in FIG. 6) according to the following procedure example.

Step 107-1) Determination of Failure of PCS Layer The presence / absence of failure is recorded for each PCSn. Further, the transmission path discard rate according to the number of BIP errors may be recorded. For example, 1.1E-6 is recorded as the error rate according to the number of BIP errors in the column corresponding to PCS ₀ of PCSn for failure determination in FIG. 6, and the number of BIP errors 11 is a threshold based on the NW quality policy. Since “10” is exceeded, “x” indicating that there is a failure (specifically, there is transmission quality degradation) is recorded. In FIGS. 6 to 8, the circles indicate that there is no failure, that is, there is no transmission quality deterioration and alarm failure. In addition, when a determination result indicating that there is no transmission quality deterioration and that there is an alarm failure is obtained, “x” meaning that there is a failure and “alarm present” that is the cause are recorded. In other words, in each column, ◯ / × indicating the presence / absence of a failure and the factor (error rate indicating transmission quality deterioration, alarm) in the case of × are recorded.

Step 107-2) Failure determination of CAUI / XLAUI layer Among PCS _{0 to} PCS ₁₉ which are detection lane aggregates, PCSn included in each lane of CAUI / XLAUI (CAUI in the present embodiment) is targeted. The presence / absence of the alarm failure determined from the AND condition of the presence / absence of the alarm failure in the target PCSn unit is determined, and the error rate and the transmission quality deterioration are determined according to the total number of BIP errors of the target PCSn. For example, for column corresponding to CAUI ₀ of CAUIn failure judgment in FIG. 6, because both the alarm failure whether PCS ₀ and PCS ₁ encompassed lanes CAUI ₀ is no alarm, no alarm about CAUI ₀ It becomes. Also, the total number of BIP errors is 22, and the transmission rate of CAUI ₀ is twice that of the PCS lane, so the error rate is 1.1E-6, and 1.1E-6 satisfies the NW quality policy. Since there is no failure, it becomes X when there is a failure (specifically, there is transmission quality degradation). If PCS ₀ has no alarm and PCS ₁ has an alarm, CAUI ₀ has no alarm. This is because if there is a failure for CAUI ₀ , it is considered that the failure is detected in all included PCSs. That is, when both PCS ₀ and PCS ₁ have no alarm, CAUI ₀ has an alarm.

Step 107-3) Wavelength λ Layer Fault Determination Targeting PCSn included in each lane of wavelength λ, determining the presence or absence of an alarm fault determined from the AND condition of the alarm fault presence or absence of the target PCSn unit The error rate and transmission quality deterioration are determined according to the total number of BIP errors of PCSn. For example, in the column corresponding to the wavelength λ ₀ of the failure determination in FIG. 6, there is no alarm for the presence / absence of the alarm failure of the included PCS ₀ to PCS ₄ , so there is no alarm failure for the wavelength λ ₀ . In addition, the total number of BIP errors of PCS ₀ to PCS ₄ included is 56, and the transmission rate for wavelength λ ₀ is 5 times that of the PCS lane, so the error rate is 1.1E-6. Since 1.1E-6 does not satisfy the NW quality policy, it becomes “X” when there is a failure (specifically, there is transmission quality degradation). Even if only one of the target PCS ₀ to PCS ₄ has no alarm failure and the other has an alarm failure, the wavelength λ ₀ is assumed to have no alarm failure. This is because if there is a failure for the wavelength λ ₀ , it is considered that an alarm failure is detected in all included PCSs.

Step 107-4) Transmission path failure determination Next, as failure information for each transmission path, PCSn included in the transmission path (one lane in the present embodiment) is targeted, and alarm failure for each PCSn that is the target. The presence / absence of alarm failure determined from the AND condition of presence / absence is determined, and the error rate and transmission quality deterioration are determined according to the total number of BIP errors of the target PCSn. The failure determination result recording method based on these determinations is the same as described above. However, the target is all PCS lanes. In this example, since it is determined that there is no alarm failure and no transmission quality deterioration (error rate is 0.28E-6) for the transmission line, “◯” is recorded without failure as shown in FIG.

  Step 108) Next, based on the information recorded in Step 107, the failure occurrence state determination unit 8 determines the failure site and the failure state. Here, in the present embodiment, the fault site is a transmission path, a specific wavelength, a specific CAUI, a specific PCS, or the like. If these can be identified, the location of a physical failure (line card, optical module, etc.) can be estimated. Also, the failure status is transmission quality deterioration presence / absence (including error rate) and alarm failure presence / absence.

Here, through a Preferred determination of A (PCS) <B (CAUI ) <C ( wavelength) <D (transmission path), C: determines that there is failure in the wavelength lambda _0. That is, if there is a fault in a large unit site (transmission path or the like), all the sites accommodated under the fault are affected. Therefore, in this embodiment, the fault occurrence state determination unit 8 determines the largest unit (maximum unit). Check the presence / absence of faults (transmission quality degradation or alarm faults) in the order of wavelength, CAUI, and PCS from the transmission path that is the lower hierarchy) and determine that there is a fault at the corresponding part of the hierarchy where the fault was first detected. To do. In this example, there is no failure in the transmission path, and the failure (transmission quality degradation) is detected only at the wavelength λ ₀ in the wavelength layer, so it is determined that there is a failure at the wavelength λ ₀ . Further, the CAUI and PCS included in each wavelength other than the wavelength λ ₀ are also checked for the presence or absence of a failure, and the wavelength λ ₀ is specified as the failure site as described above because there is no failure.

Further, since there is no alarm failure at the wavelength λ ₀ , the failure occurrence state can be specified as transmission quality deterioration (1.1E-6). In addition, as described with reference to FIG. 3, when it is determined that there is a failure at the wavelength λ ₀ , the optical module or the transmission path (optical fiber) can be specified as the physical failure part. May be recorded and included in the notification information to be described later.

Step 109) The failure occurrence state determination unit 8 outputs information (1.1E-6 may be included) indicating that transmission quality deterioration has occurred at the wavelength λ _{0 as} the determination result in Step 108 as an alarm notification processing unit. 9. Notify the execution instruction unit 10 to the redundancy processing unit and the transmission quality state display unit 11.

  Step 110) Upon receiving the determination result, the alarm notification processing unit 9 issues an alarm notification, and the execution instruction unit 10 to the redundancy processing unit instructs the LAG redundancy management unit to perform switching notification.

Further, the transmission quality state display unit 11 displays information indicating that transmission quality deterioration has occurred at the wavelength λ ₀ . The transmission quality state display unit 11 can display the following information.

-Transmission quality in PCSn unit and failure occurrence status-Transmission quality in CAUIm units (XLAUI unit in the case of 40G) and failure occurrence status-Transmission quality and failure occurrence status in wavelength λp units-Transmission path quality In addition, transmission quality status display section 11 can display the above information even in a case where failure determination is not reached. Information for display is read from the table of FIG. 6 and notified from the failure occurrence state determination unit 8.

  In addition to the above example, for example, when there is no failure in the transmission path and each wavelength and it is determined that there is a failure in a specific CAUI, it can be estimated that there is a failure in either or both of the line card and the optical module.

  Note that the PCS synchronization state and the λ power level are not used in the automatic failure determination logic in the above example. These are displayed, for example, to the operator from the transmission quality state display unit 11, and the operator can analyze the cause of the failure based on the PCS synchronization state and λ power level information in addition to the automatic determination result. Further, either or both of the PCS synchronization state and the λ power level may be used in the automatic failure determination. For example, the failure occurrence state determination unit 8 confirms the PCS synchronization state OK / NG in the table after determining the failure site and the failure state in the above-described procedure. When it is determined that there is no failure in the determination of the failure part and the failure state in the above-described procedure and the PCS synchronization state is NG, the PCS layer as the failure part and the skew adjustment as the failure state Information indicating abnormality is notified to the alarm notification processing unit 9, the execution instruction unit 10 to the redundancy processing unit, and the transmission quality state display unit 11. An example using the λ power level will be described in a processing procedure example 4 to be described later.

(Processing procedure example 2)
Next, as a processing procedure example 2, a processing procedure related to failure determination when a failure occurs only in a specific PCS ₁ will be described with reference to FIG. The basic processing procedure is the same as the processing procedure example 1 shown in the flowchart in FIG. 5, and therefore, the following description will focus on differences from the processing procedure example 1.

Steps 201 to 207) are the same as steps 101 to 107 (from policy input to failure determination of each layer) of processing procedure example 1. However, in the processing procedure example 2, the measurement result and the determination result as shown in FIG. 7 are obtained. That is, in the processing procedure example 2, in the failure determination of the PCS lane, a result that only the PCS ₁ has a failure (alarm exists) is obtained.

  Step 208) Based on the information recorded in Step 207, the failure occurrence state determination unit 8 determines the failure site and state.

Here, the priority determination of A <B <C <D is performed, and it is determined that A: PCS ₁ has a failure. As for the fault condition, there is a warning failure PCS _1, determines that an alarm failure PCS _1. From FIG. 3, when a failure occurs in a specific PCS lane, it can be estimated that there is a failure in the line card. Therefore, “line card” may be included as a failure part in the notification information.

Step 209) The failure occurrence state determination unit 8 sends information indicating that a failure has occurred in the PCS _{1 as} the determination result in Step 208 (may include “line card failure”) to the alarm notification processing unit 9, redundant To the execution instruction unit 10 and the transmission quality state display unit 11 to the transmission processing unit.

Step 210) Similar to step 110, the alarm notification processing unit 9 that has received the determination result issues an alarm notification, and the execution instruction unit 10 to the redundancy processing unit instructs the LAG redundancy management unit to perform switching notification. Further, the transmission quality state display unit 11 displays information indicating that a failure has occurred in the PCS ₁ .

(Processing procedure example 3)
Next, as a processing procedure example 3, a processing procedure related to determination when an event that is estimated to have deteriorated the quality of the transmission path has occurred will be described with reference to FIG. Since the basic processing procedure is the same as the processing procedure example 1 shown in the flowchart of FIG. 5, the following description will focus on differences from the processing procedure example 1.

Steps 301 to 307) The same as steps 101 to 107 (from policy input to failure determination of each layer) of processing procedure example 1. However, in the processing procedure example 3, the measurement result and the determination result as shown in FIG. 8 are obtained. That is, the processing procedure example 3 is included in the PCS ₇ and the CAUI ₅ in addition to the determination result of the transmission quality degradation in each PCSn included in the wavelength λ ₁ as in the processing procedure example 1. A determination result of transmission quality deterioration is obtained in each PCSn.

  Step 308) Based on the information recorded in step 207, the failure occurrence state determination unit 8 determines the failure site and state.

Again, priority determination of A <B <C <D is performed. In the processing procedure example 3, first, similarly to the processing procedure example 1, it is determined that there is a transmission quality deterioration at the wavelength λ ₀ , but the PCS ₇ included in the wavelength λ ₁ and the CAUI included in the wavelength λ ₂ are used. ₅ is also determined to have transmission quality degradation. In this case, as an example, the failure occurrence state determination unit 8 may notify each part and state obtained by the determination as a failure part and a failure state in the same manner as in the previous examples.

  However, since a specific part cannot be determined when a plurality of faulty parts are detected, in this example, the faulty part and the fault state are determined as “unknown”.

  Step 309) The failure occurrence state determination unit 8 notifies the transmission quality state display unit 11 of information indicating that both the failure part and the failure state, which are the determination results in Step 308, are unknown. At this time, in addition to the information indicating that the failure part and the failure state are both unknown, the failure determination result information in FIG. 8 is also notified.

  Step 310) The transmission quality state display unit 11 that has received the determination result displays the information notified from the failure occurrence state determination unit 8. For example, the operator recognizes that a random error has occurred in a plurality of PCSn, determines that a transmission path failure has occurred, and takes necessary measures.

(Processing procedure example 4)
Next, as a processing procedure example 4, a processing procedure related to failure determination when power level degradation of the wavelength λ ₀ occurs will be described with reference to FIG. The basic processing procedure is the same as the processing procedure example 1 shown in the flowchart in FIG. 5, and therefore, the following description will focus on differences from the processing procedure example 1.

Steps 401 to 407) The same as steps 101 to 107 (from policy input to failure determination of each layer) of processing procedure example 1. However, in the processing procedure example 4, the measurement result and the determination result as shown in FIG. 9 are obtained. That is, in the processing procedure example 4, in the failure determination of the PCS lane, a result that there is a failure (alarm exists) in PCS _{0 to} PCS ₄ is obtained.

  Step 408) Based on the information recorded in Step 407, the failure occurrence state determination unit 8 determines the failure site and state.

Again implement priority determination of A <B <C <D, C: determines that there is failure in the wavelength lambda _0. As for the fault condition, it determines an alarm failure of a wavelength lambda _0. In the processing procedure example 4, when the failure occurrence state determination unit 8 determines that there is a failure in the wavelength λ, the failure generation state determination unit 8 further performs a determination of a decrease in power level for the wavelength λ. That is, in this example, since the power level of the wavelength λ ₀ has not reached the decrease determination threshold, it is determined that the power level decrease of the wavelength λ ₀ has occurred as a failure state. In this case, since the faulty part can be estimated to be an optical module or a relay device, the notification information may include “optical module or relay device” as the faulty part.

Step 409) The failure occurrence state determination unit 8 executes the information indicating that a failure in power level reduction has occurred at the wavelength λ _0, which is the determination result in Step 408, to the alarm notification processing unit 9 and the redundancy processing unit. The instruction unit 10 and the transmission quality state display unit 11 are notified.

Step 410) As in step 110, the alarm notification processing unit 9 that has received the determination result issues an alarm notification, and the execution instruction unit 10 to the redundancy processing unit instructs the LAG redundancy management unit to perform switching notification. Further, the transmission quality state display unit 11 displays information indicating that a power level lowering failure has occurred at the wavelength λ ₀ .

  As described above, according to the embodiment of the present invention, signal transmission is performed using a transmission scheme configured by hierarchically connecting a plurality of lane aggregates including one or a plurality of lanes for transmitting signals. In a communication system to be performed, it is possible to specify a fault site and a fault state only by using a monitoring function of a specific layer (PCS layer in the present embodiment).

  The present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the scope of the claims.

DESCRIPTION OF SYMBOLS 100 Failure monitoring determination apparatus 200 Communication apparatus 1 NW quality policy input part 2 Measurement interval input part 3 PCS lane position management table 4 BIP error number management part 5 Failure occurrence state management part 6 Transmission path quality degradation counter threshold value calculation part
7 Error determination unit 8 Failure occurrence state determination unit 9 Alarm notification processing unit 10 Execution instruction unit to redundancy management unit 11 Transmission quality state display unit

Claims (6)

Fault monitoring / determining apparatus for judging a fault state in a communication system that performs signal transmission using a transmission system configured by hierarchically connecting a plurality of lane aggregates composed of one or a plurality of lanes for transmitting signals Because
Failure information acquisition means for acquiring failure information in units of lanes in a detection lane assembly that is one lane assembly of the plurality of lane assemblies;
Correspondence information storage means for storing correspondence information in which each lane of the detection lane aggregate and each lane of the other lane aggregate are associated with each other;
Based on the failure information acquired by the failure information acquisition unit and the correspondence information stored in the correspondence information storage unit, another lane assembly corresponding to the lane of the detected lane assembly from which the failure information has been acquired A failure monitoring and determination apparatus comprising: failure determination means that determines a failure in the lane and determines a site where the failure has occurred based on a result of the failure determination. The failure information acquisition means acquires transmission quality information as one of the failure information for each lane in the detected lane assembly,
The failure determination means calculates transmission quality information of each lane of each other lane aggregate using the transmission quality information of each lane in the detected lane aggregate, and based on the calculated transmission quality information, The failure monitoring determination device according to claim 1, wherein the failure determination is performed by determining whether transmission quality is deteriorated in each lane of each lane aggregate. The plurality of hierarchically connected lane aggregates include at least the detection lane aggregate and the lowest lane aggregate in order from the upper hierarchy,
The failure determination means checks the failure determination result of each lane of each lane assembly in order from the lowest lane assembly to the higher-level lane assembly, and it is first confirmed that there is a failure. The failure monitoring determination apparatus according to claim 1, wherein the corresponding lane of the lane aggregate of the hierarchy is determined as a failure part. The failure determination unit includes a case where the failure information in the lane determined as the failure part includes information indicating that transmission quality is deteriorated, and the failure information does not include information indicating that a failure due to an alarm has occurred. The failure monitoring determination device according to claim 3, wherein the failure state of the failure part is determined to be transmission quality degradation. Fault monitoring / determining apparatus for judging a fault state in a communication system that performs signal transmission using a transmission system configured by hierarchically connecting a plurality of lane aggregates composed of one or a plurality of lanes for transmitting signals Is a fault monitoring determination method executed by
The failure monitoring determination device stores correspondence information in which each lane of the detection lane assembly, which is one lane assembly of the plurality of lane assemblies, is associated with each lane of the other lane assembly. Corresponding information storage means,
Failure information acquisition step for acquiring failure information in units of lanes in the detected lane assembly;
Other lane aggregates corresponding to the lanes of the detected lane aggregate that acquired the fault information based on the fault information acquired by the fault information acquisition step and the correspondence information stored in the correspondence information storage unit A failure monitoring determination method comprising: a failure determination step of determining a failure in the lane and determining a site where the failure has occurred based on a result of the failure determination.   The program for functioning a computer as each means of the failure monitoring determination apparatus of any one of Claims 1 thru | or 4.

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