WO2015155816A1 - Dispositif de réseau et procédé de communication - Google Patents

Dispositif de réseau et procédé de communication Download PDF

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Publication number
WO2015155816A1
WO2015155816A1 PCT/JP2014/060076 JP2014060076W WO2015155816A1 WO 2015155816 A1 WO2015155816 A1 WO 2015155816A1 JP 2014060076 W JP2014060076 W JP 2014060076W WO 2015155816 A1 WO2015155816 A1 WO 2015155816A1
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WO
WIPO (PCT)
Prior art keywords
communication
identification information
parameter
cable
parameter table
Prior art date
Application number
PCT/JP2014/060076
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English (en)
Japanese (ja)
Inventor
徳寿 阿久津
Original Assignee
株式会社日立製作所
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Priority to PCT/JP2014/060076 priority Critical patent/WO2015155816A1/fr
Publication of WO2015155816A1 publication Critical patent/WO2015155816A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing
    • H04B3/48—Testing attenuation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]

Definitions

  • the present invention relates to a technique for performing a communication test on a communication cable connected to a network device.
  • Patent Document 1 discloses a technique related to error reduction in an input / output interface.
  • information about a specific operation mode suitable for operation is stored in the device connected to the input / output interface, and the controller of the input / output interface reads the information to operate the interface suitable for operation. Operate the device in mode. As a result, the probability of an error occurring is reduced.
  • a general-purpose communication cable does not always store information on a specific operation mode suitable for operation as described in Patent Document 1 described above. Therefore, in a network device (for example, a network switch) in which a general-purpose communication cable is connected to an input / output interface, the controller of the network device reads information about the operation mode from the communication cable and operates the interface in an operation mode suitable for operation. It may be difficult to do.
  • a network device for example, a network switch
  • the network device needs to operate the interface in an operation mode suitable for each communication cable.
  • the present invention has been made in view of the problems as described above, and provides a technique that enables communication in an appropriate operation mode even when a communication cable whose communication parameters are not always clear is used.
  • the purpose is to provide.
  • the network device includes a table describing a correspondence relationship between identification information of a communication cable and a correction parameter suitable for the communication cable, and uses a communication cable that does not hold the identification information. Perform a test to identify the correct correction parameters for the communication cable.
  • the interface can be operated in an operation mode suitable for the communication cable.
  • FIG. 1 is a block diagram illustrating a configuration of a network device 100 according to a first embodiment. It is a figure which shows the structure and data example of the cable management table 200 which the flash ROM 106 stores. It is a figure which shows the structure and data example of the parameter table 300 which flash ROM106 stores. It is a figure which shows the structure and data example of the parameter table 300 which flash ROM106 stores. It is a figure which shows the structure and data example of the parameter table 300 which flash ROM106 stores. It is a figure which shows the structure and data example of the parameter table 300 which flash ROM106 stores. It is a flowchart explaining the process in which the network apparatus 100 determines the necessity of a communication test. It is a flowchart explaining the process of a normal version communication test. It is a flowchart explaining the process of a simplified version communication test. 5 is a flowchart for describing processing in which the network apparatus 100 dynamically adjusts correction parameters of a communication LSI 102.
  • FIG. 1 is a block diagram showing a configuration of a network device 100 according to the first embodiment of the present invention.
  • the network device 100 is a device that transmits and receives communication signals via a communication cable 104 connected to the network device 100, and includes a switch LSI (Large Scale Integration) 101, a communication LSI 102, a module connector 103, a CPU (Central Processing Unit) 105, a flash A ROM (Read Only Memory) 106 is provided.
  • LSI Large Scale Integration
  • a communication LSI 102 includes a communication LSI 102, a module connector 103, a CPU (Central Processing Unit) 105, a flash A ROM (Read Only Memory) 106 is provided.
  • CPU Central Processing Unit
  • flash A ROM Read Only Memory
  • the switch LSI 101 is a circuit that provides a function as a network switch by performing processing for switching communication data.
  • the communication LSI 102 transmits / receives data to / from other communication devices via the communication cable 104.
  • the module connector 103 is a connector for connecting the communication cable 104.
  • the CPU 105 controls the switch LSI 101 and the communication LSI 102.
  • the flash ROM 106 holds correction parameters used when the communication LSI 102 transmits and receives communication signals for each identification information of the communication cable 104.
  • FIG. 2 is a diagram showing a configuration of the cable management table 200 stored in the flash ROM 106 and an example of data.
  • the cable management table 200 is a data table for managing identification information of the communication cable 104, and holds a module type 201, a cable type 202, a cable length 203, a Vendor model number 204, an optimum setting 205, and a parameter table 206. Since the module type 201, the cable type 202, the cable length 203, and the Vendor model number 204 are parameters that affect the communication characteristics of the communication cable 104, these items can be used as identification information of each communication cable 104. Other items will be described later.
  • the module type 201 holds the type of the transceiver module to be inserted into the module connector 103.
  • the cable type 202 holds the type of the communication cable 104.
  • the cable length 203 holds the length of the communication cable 104.
  • the Vendor model number 204 is a product model number assigned to each communication cable by the manufacturer of the communication cable 104.
  • the optimum setting 205 and parameter table 206 will be described later.
  • 3A to 3C are diagrams showing a configuration of the parameter table 300 stored in the flash ROM 106 and an example of data.
  • the parameter table 300 is a data table corresponding to the parameter table 206 in FIG. 2, and one parameter table 300 is provided for each record held in the cable management table 200 (that is, for each identification information of the communication cable 104).
  • alphabetical subscripts are added to distinguish each table.
  • the parameter table 300 is a data table that holds the result of performing a communication test on each communication cable 104. As a result of performing a communication test using each combination of a correction parameter used during transmission and a correction parameter used during reception.
  • the connection availability and error rate (BER: Bit Error Rate) are held for each combination.
  • BER Bit Error Rate
  • the transmission intensity is exemplified as the transmission correction parameter
  • the reception correction amount is exemplified as the reception correction parameter.
  • other transmission / reception correction parameters may be used. That is, an appropriate correction parameter that can maintain an appropriate communication waveform at the time of transmission and at the time of reception can be used.
  • FIG. 4 is a flowchart for explaining processing in which the network device 100 determines whether or not a communication test is necessary.
  • the communication test referred to here is a test performed to specify the correction parameter of the communication LSI 102 suitable for the communication cable 104.
  • each step of the flowchart shown in FIG. 4 will be described.
  • Step S400 The CPU 105 starts this flowchart according to a predetermined condition. For example, a case where the user of the network apparatus 100 instructs to start a communication test via an appropriate operation interface, or when the communication LSI 102 detects that the communication cable 104 is connected to the module connector 103 is considered.
  • the CPU 105 reads identification information from the communication cable 104.
  • the identification information of the communication cable 104 can be read from the memory chip.
  • the module connector 103 itself is configured to be detachable and has a built-in memory chip.
  • the means for reading out the identification information of the communication cable is well-known, for example, by standardization, and will not be described here. If the identification information of the communication cable 104 can be acquired by other appropriate means, that means may be used.
  • Step S402 The CPU 105 compares the acquired identification information of the communication cable 104 with the identification information in the cable management table 200 stored in the flash ROM 106.
  • Step S403 If the identification information of the communication cable 104 matches any identification information in the cable management table 200 for the module type 201, the cable type 202, the cable length 203, and the Vendor model number 204, the communication cable 104 Since the optimum correction parameter has already been specified, it is determined that the communication test is unnecessary, and this flowchart is ended. If the identification information of the communication cable 104 does not match any identification information in the cable management table 200, that is, if at least one of the module type 201, the cable type 202, the cable length 203, and the Vendor model number 204 is different. The process proceeds to S404.
  • Steps S404 and S405 For the module type 201, the cable type 202, and the cable length 203, if the identification information of the communication cable 104 matches any of the identification information in the cable management table 200 and does not match only the Vendor model number 204, the communication The cable 104 is considered to have similar characteristics to the known communication cable 104 already stored in the cable management table 200 except for the Vendor model number 204. Therefore, the CPU 105 performs a simplified version communication test described later with reference to FIG. 6 and specifies a correction parameter suitable for the communication cable 104.
  • Steps S404 and S406 When the identification information of the communication cable 104 does not match any identification information in the cable management table 200 for all of the module type 201, the cable type 202, and the cable length 203, the communication cable 104 is unknown to the network device 100. It is believed that there is. Therefore, the CPU 105 performs a normal version communication test described later with reference to FIG. 5 and specifies a correction parameter suitable for the communication cable 104.
  • FIG. 5 is a flowchart for explaining processing of the normal version communication test. Hereinafter, each step of the flowchart shown in FIG. 5 will be described.
  • the CPU 105 starts this flowchart in step S406 of FIG.
  • the communication test can be performed by the network device 100 alone without using an external communication device by connecting both ends of the same communication cable 104 to different module connectors 103.
  • the CPU 105 acquires the identification information of the communication cable 104 via different module connectors 103, and starts the flowchart if the identification information is the same.
  • the present invention is not limited to this.
  • the CPU 105 sets the transmission intensity and the reception correction amount of the communication LSI 102 to minimum values (S501).
  • the CPU 105 controls the switch LSI 101 to perform a communication test by continuing data communication for a specified time in a path passing through the two communication LSIs 102 to which the communication cable 104 is connected (S502).
  • the time for continuing the data communication is arbitrary, it is desirable that the communication duration is longer from the viewpoint of improving the accuracy of the error occurrence rate measured by the communication test.
  • the specified communication duration in the normal version communication test is 20 minutes.
  • Step S503 The CPU 105 reads from the communication LSI 102 the link state of the communication LSI 102 (whether or not a communication link has been established with the communication destination) and the number of errors that occurred in the communication in step S502, and the link state and error occurrence
  • the rate (which can be calculated from the number of error occurrences) is recorded in the flash ROM 106 as the parameter table 300 regarding the communication cable 104.
  • Step S504 The CPU 105 determines whether or not a communication test has been performed using all reception correction amount setting values for the transmission intensity set in the communication LSI 102 at that time. When there is a reception correction amount setting value that has not been tested, the process proceeds to step S505, and when the communication test is completed for all reception correction amount setting values, the process proceeds to step S506.
  • Step S505 The CPU 105 increases the reception correction amount setting value of the communication LSI by one level, returns to step S502, and performs a communication test again.
  • Specific numerical values for each level of the reception correction amount setting value may be determined in advance for each type of the assumed communication cable 104, for example, or the same value may be used uniformly. The same applies to the level of transmission intensity described later.
  • Step S506 The CPU 105 sets the reception correction amount of the communication LSI 102 to the minimum value.
  • Step S507 The CPU 105 determines whether or not a communication test has been performed using all transmission strengths that can be set in the communication LSI 102. If transmission strength that has not been tested remains, the process proceeds to step S508, and if communication tests have been completed for all transmission strengths, the process proceeds to step S509. In this flowchart, since the transmission strength is gradually increased, when the transmission strength reaches the maximum value that can be set in the communication LSI 102, it can be considered that the communication test has been completed for all the transmission strengths.
  • Step S508 The CPU 105 increases the transmission intensity of the communication LSI 102 by one level, returns to step S502, and performs a communication test again.
  • the CPU 105 determines an optimal correction parameter of the communication LSI 102 for the communication cable 104 from the parameter table 300 created during the communication test.
  • the CPU 105 adds the identification information of the communication cable 104 and the determined optimum correction parameter of the communication LSI 102 to the cable management table 200 in association with the parameter table 300 created in the course of the communication test.
  • the optimum correction parameter can be designated as the optimum setting 205.
  • the association with the parameter table 300 can be specified by storing the name of the table as the parameter table 206, for example.
  • Step S509 Supplement
  • a method for determining the optimum correction parameter of the communication LSI 102 will be described with reference to FIG. 3B.
  • a parameter table 300b shown in FIG. 3B is obtained.
  • the CPU 105 obtains an average value of error occurrence rates for all nine combinations including a combination before and after a certain combination of transmission intensity and reception correction amount in the parameter table 300.
  • the combination of the transmission intensity and the reception correction amount which is the center of the nine combinations with the lowest error occurrence rate, is considered to be a correction parameter that can be stably communicated. Can be determined.
  • the method for determining the optimum correction parameter is not necessarily limited to this, and any method can be used.
  • FIG. 6 is a flowchart for explaining processing of the simplified version communication test. Hereinafter, each step of the flowchart shown in FIG. 6 will be described.
  • Step S601 The CPU 105 reads the identification information in which the module type 201, the cable type 202, and the cable length 203 match the communication cable 104 from the cable management table 200, and acquires the optimum setting 205.
  • the CPU 105 sets the correction parameter specified by the acquired optimum setting 205 in the communication LSI 102. This step is for diverting the optimal correction parameter of a known communication cable similar to the communication cable 104 to be tested.
  • Steps S602 to S603 The CPU 105 confirms the link state of the communication LSI 102. If it is not possible to link normally, the characteristics of the communication cable 104 to be tested are considered to be significantly different from those of the known communication cable. Therefore, the simplified communication test is stopped, and the process proceeds to step S603, where the normal communication cable described in FIG. Conduct a version communication test. If the link is established, the process proceeds to step S604.
  • Steps S604 to S605 The CPU 105 performs data communication via the communication cable 104 to be tested by the same method as step S502 in FIG. 5 (S604).
  • the CPU 105 records the link state and error occurrence rate of the communication LSI 102 in the flash ROM 106 by the same method as in step S503 in FIG. 5 (S605).
  • Step S606 The CPU 105 determines whether or not the error occurrence rate of the test target communication cable 104 recorded in step S605 exceeds the error occurrence rate of the known similar communication cable specified in step S601. If it exceeds, it is determined that the transmission characteristic of the communication cable 104 to be tested is different from that of a known similar cable, and the process proceeds to step S603 to perform the normal version communication test described with reference to FIG. If the error occurrence rate is equal to or lower than the known similar communication cable, the process proceeds to step S607.
  • Step S606 Supplement 1
  • a correction parameter close to the optimal setting 205 of the known communication cable identified in step S601 may be set in the communication LSI 102, and steps S604 to S606 may be performed again.
  • correction parameters close to the optimum setting 205 for example, eight combinations around the optimum setting 205 in the parameter table 300 can be used.
  • Step S606 Supplement 2
  • the process proceeds to step S607 and the known correction parameter is set. You may divert. That is, if the error occurrence rate of the communication cable 104 to be tested is within a predetermined range compared to the error occurrence rate of the known cable, it may be considered that the known correction parameter can be used.
  • Step S607 The CPU 105 associates the combination of the identification information of the communication cable 104 and the optimal setting 205 of the known communication cable specified in step S601 with the parameter table 300 created in the course of the communication test, and then stores it in the cable management table 200. to add.
  • the correspondence between the items is the same as that in step S509 in FIG.
  • the network device 100 when the identification information of the communication cable 104 is not stored in the cable management table 200, the network device 100 according to the first embodiment performs the communication test and communicates with the communication cable 104. Is determined, and the correction parameter is added to the cable management table 200. Thereby, even if it is a case where the unknown communication cable 104 is used, it can communicate using an optimal interface operation mode.
  • the network device 100 also includes known identification information in the cable management table 200 in which the module type 201, the cable type 202, and the cable length 203 are the same among the identification information of the communication cable 104 and the others are different.
  • the simplified version communication test is performed by diverting the correction parameter corresponding to the known identification information. Thereby, the communication test with respect to the unknown communication cable 104 can be simplified.
  • the simplified communication test is performed when only the Vendor model number 204 of the identification information of the communication cable 104 is different. This is because it is considered that the communication characteristics are similar if the module type 201, the cable type 202, and the cable length 203 are the same. Therefore, as long as at least the module type 201, the cable type 202, and the cable length 203 are the same, the simplified communication test may be performed in the same manner. That is, if these items are the same, the same flow as in FIG. 4 can be performed even when identification information other than the Vendor model number 204 is used.
  • FIG. 7 is a flowchart for explaining processing in which the network device 100 dynamically adjusts the correction parameters of the communication LSI 102. Hereinafter, each step of the flowchart shown in FIG. 7 will be described.
  • Step S700 For example, the CPU 105 starts this flowchart when the communication LSI 102 detects the occurrence of an error exceeding a specified value.
  • the network device 100 may be started by giving an instruction via an appropriate operation interface.
  • Step S701 The CPU 105 refers to the parameter table 300 corresponding to the identification information of the communication cable 104 connected to the communication LSI 102, and acquires a value that is one step larger than the current optimum setting value for the transmission intensity of the communication LSI 102.
  • the CPU 105 attempts communication using the transmission intensity. If a communication link can be established with the transmission destination, the process proceeds to step S702, and if not, the process skips to step S703.
  • Step S702 The CPU 105 temporarily changes the transmission intensity of the communication LSI 102 from the current optimum setting value to a value larger by one step, and continues communication for a specified time and records the error occurrence rate.
  • Step S703 The CPU 105 refers to the parameter table 300 corresponding to the identification information of the communication cable 104 connected to the communication LSI 102, and acquires a value that is one step smaller than the current optimum setting value for the transmission intensity of the communication LSI 102.
  • the CPU 105 attempts communication using the transmission intensity. If a communication link can be established with the transmission destination, the process proceeds to step S704, and if not, the process skips to step S705.
  • Step S704 The CPU 105 temporarily changes the transmission intensity of the communication LSI 102 from the current optimum setting value to a value that is one step smaller, and continues communication for a specified time and records the error rate.
  • Step S705 The CPU 105 refers to the parameter table 300 corresponding to the identification information of the communication cable 104 connected to the communication LSI 102, and acquires a value that is one step larger than the current optimum setting value for the reception correction amount of the communication LSI 102. The CPU 105 attempts communication using the reception correction amount. If a communication link can be established with the transmission destination, the process proceeds to step S706, and if not, the process skips to step S707.
  • Step S706 The CPU 105 temporarily changes the reception correction amount of the communication LSI 102 from the current optimum setting value to a value that is one step larger, and continues communication for a specified time and records the error occurrence rate.
  • Step S707 The CPU 105 refers to the parameter table 300 corresponding to the identification information of the communication cable 104 connected to the communication LSI 102, and acquires a value that is one step smaller than the current optimum setting value for the reception correction amount of the communication LSI 102. The CPU 105 attempts communication using the reception correction amount. If a communication link can be established with the transmission destination, the process proceeds to step S708, and if not, the process skips to step S709.
  • Step S708 The CPU 105 temporarily changes the reception correction amount of the communication LSI 102 from the current optimum setting value to a value one step smaller, and continues communication for a specified time and records the error occurrence rate.
  • Steps S709 to S710 The CPU 105 determines a correction parameter having the lowest error occurrence rate as a new optimum value from the error occurrence rates measured in Step S702, Step S704, Step S706, and Step S708 (S709).
  • the CPU 105 stores the new optimum setting 205 in the cable management table 200, reflects the measured error occurrence rate in the parameter table 300, and applies the new optimum setting 205 to the communication LSI 102.
  • the network device 100 when the error occurrence rate reaches the specified value, the network device 100 according to the second embodiment attempts communication using the other correction parameters described in the parameter table 300, and the optimal correction parameter is set. Is identified again. Thereby, even when the optimal correction parameter changes, it can be dynamically readjusted.
  • the example in which the transmission intensity and the reception correction amount are each ⁇ 1 from the optimum setting value has been described.
  • the example of the correction parameter that is temporarily used is not limited to this, and is described in the parameter table 300.
  • the communication test may be performed again using at least a part of the correction parameters.
  • 100 network device
  • 101 switch LSI
  • 102 communication LSI
  • 103 module connector
  • 104 communication cable
  • 105 CPU
  • 106 flash ROM.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

　La présente invention a pour but de proposer une technique au moyen de laquelle il est possible de réaliser une communication dans un mode de fonctionnement approprié même lorsqu'un câble de communication est utilisé, pour lequel un paramètre approprié pour une communication n'est pas nécessairement évident à l'avance. L'invention concerne un dispositif de réseau comportant une table dans laquelle une corrélation entre des informations d'identification concernant un câble de communication et un paramètre de correction approprié pour le câble de communication est décrite, et qui, lors de l'utilisation d'un câble de communication pour lequel des informations d'identification ne sont pas conservées, exécute un test de communication et spécifie un paramètre de correction approprié pour le câble de communication (montré dans la Fig. 4).
PCT/JP2014/060076 2014-04-07 2014-04-07 Dispositif de réseau et procédé de communication WO2015155816A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05291985A (ja) * 1992-04-08 1993-11-05 Nec Corp 振幅等化器
JP2011015113A (ja) * 2009-07-01 2011-01-20 Kowa Co 信号伝送装置
JP2012090022A (ja) * 2010-10-19 2012-05-10 Hitachi Ltd 信号波形の品質改善方式

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05291985A (ja) * 1992-04-08 1993-11-05 Nec Corp 振幅等化器
JP2011015113A (ja) * 2009-07-01 2011-01-20 Kowa Co 信号伝送装置
JP2012090022A (ja) * 2010-10-19 2012-05-10 Hitachi Ltd 信号波形の品質改善方式

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