WO2001086926A1 - Dispositif nodal et dispositif d'interruption non breve - Google Patents

Dispositif nodal et dispositif d'interruption non breve Download PDF

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Publication number
WO2001086926A1
WO2001086926A1 PCT/JP2000/002956 JP0002956W WO0186926A1 WO 2001086926 A1 WO2001086926 A1 WO 2001086926A1 JP 0002956 W JP0002956 W JP 0002956W WO 0186926 A1 WO0186926 A1 WO 0186926A1
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WO
WIPO (PCT)
Prior art keywords
signal
line
lines
node device
signals
Prior art date
Application number
PCT/JP2000/002956
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English (en)
Japanese (ja)
Inventor
Tooru Matsumoto
Yoshihiro Shimizu
Hiroshi Yoshida
Tsuyoshi Orito
Takeo Katou
Original Assignee
Fujitsu Limited
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.)
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Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2000/002956 priority Critical patent/WO2001086926A1/fr
Publication of WO2001086926A1 publication Critical patent/WO2001086926A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing

Definitions

  • the present invention relates to a node device connected to one end of a redundantly configured transmission line and realizing switching of a system configuration by instantaneous interruption according to an operation state of the transmission line and an instantaneous interruption switching device.
  • the transmitting end is connected to a working transmission path (hereinafter, referred to as “working transmission path”) and a protection transmission path (hereinafter, referred to as “protection transmission path”).
  • working transmission path hereinafter, referred to as “working transmission path”
  • protection transmission path hereinafter, referred to as “protection transmission path”.
  • the same STM signal is sent in parallel under synchronization.
  • the receiving end that opposes the STM signal over the transmission path before the STM signal received via the protection transmission path when a failure, significant degradation of transmission quality, or other predetermined event occurs on the current transmission path. Apply as signal received from.
  • the cost was high because the same number of protection lines as the number of working lines had to be physically laid.
  • An object of the present invention is to provide a node device and a non-interruptionless network capable of flexibly adapting to a desired service form and traffic distribution for each transmission section in addition to a reduction in the total number of physical transmission paths. It is to provide a switching device.
  • the object of the present invention is to reduce the work involved in maintenance and operation, in addition to avoiding instantaneous interruptions while minimizing reliability degradation compared to the conventional example where all lines are duplicated. Another point is that running costs can be reduced.
  • an object of the present invention is that even if the number of protection lines is small, the replacement of a desired line by these protection lines is realized with high accuracy.
  • an object of the present invention is to provide a non-pay-field, which is to be transmitted via a plurality of lines and a single or a plurality of n backup lines, regardless of the format and content thereof, The point is that various transmission methods can be applied.
  • an object of the present invention is that a protection line is effectively applied in order to replace a line in which a true failure has occurred or in which the transmission quality has significantly deteriorated. It is another object of the present invention to maintain transmission quality overall high.
  • a further object of the present invention is to reduce the overall cost including the running cost and improve the reliability in addition to the simplification of the hardware configuration.
  • an object of the present invention is to absorb a difference in transmission characteristics between a corresponding line and a protection line at a desired speed and accuracy when a line in which a failure occurs or transmission quality is deteriorated is replaced with a protection line.
  • overall costs including running costs can be reduced along with the efficient use of spare lines.
  • an object of the present invention is that the present invention can be applied to a communication control method in which a line to be replaced with a protection line is to be selected at a transmitting end.
  • an object of the present invention is to maintain high service quality and achieve effective use of resources as compared with a case where invalid cooperation with a transmitting end can be performed.
  • the object of the present invention is to make it possible to flexibly adapt to various needs related to maintenance and operation as compared with a case where no standard is set for selecting a line to be replaced with a protection line. It is in.
  • the object of the present invention is to improve the reliability and reduce the overall cost including running costs, in addition to simplifying the configuration, compared to a case where all of the multiple lines are duplicated.
  • Another object of the present invention is to achieve effective use of resources and improvement of service quality.
  • the objectives described above are for signals received individually via a plurality of N lines, and for signals received via a single or a plurality of n (i.e., N) spare lines, and all or some of these signals.
  • the signal to be received via multiple N lines is corrected as the difference between the two and the sum signal corresponding to the sum of the signals.
  • the signal corresponding to the line in which the fault (including the deterioration of transmission quality) has occurred is replaced with a substitute signal for the signal received through that line.
  • a node device that is characterized in that it is applied in a separate manner.
  • the total number of lines to be laid in the transmission section to which the present invention is applied is the number of lines out of a plurality of N lines that may cause the above-described failure or transmission quality deterioration in parallel. As long as the number is less than or equal to the number n of the protection lines, even if the number n is less than N, the number is less than 2N.
  • the above-described object is to provide a method in which a specific signal to be individually received via any of the plurality of N lines is a sum of a plurality of different desired sum signals among the sum signals received via the protection line.
  • One of the multiple sum signals that are included in common as components and that are recovered as the difference from the signal received via the line where no failure has occurred is applied.
  • a signal to be received through a line in which a failure has occurred or transmission quality has been degraded is a transmission of a sum signal including these signals as components.
  • the above-mentioned object is achieved by providing any sum signal as a signal corresponding to only the payload via the corresponding protection line, and the failure of each line is transmitted via the corresponding line.
  • This is achieved by a node device characterized by the fact that the payload is identified as valid or invalid.
  • the purpose described above is to make the individual signals recovered as differences Select a signal that is legitimate or has few bit errors under the specified frame configuration among the signals received via the line where these signals are to be received, and responds to that signal.
  • node apparatus is characterized in that to apply a signal received over the working line (in this node device, bit error minor that may occur in a plurality of lines, the protection line Both are obtained as a normal signal without being applied.
  • a node device characterized in that, as a signal to be received through a single line, a difference between a signal received through one of the other lines and one of the protection lines is applied. Is achieved by
  • the line with lower transmission quality is preferentially replaced by one of the protection lines.
  • a node device characterized in that signal identification and phase difference correction are performed in a baseband region.
  • individual components are: Compared with the case where the same processing is performed in the intermediate frequency band or the radio frequency band, it can be configured with a slower element.
  • the above-mentioned object is to provide, when the transmission quality of any one of a plurality of N lines falls below a threshold, in an ascending order of the transmission quality below the threshold, the number of protection lines is equal to or less than the number of protection lines.
  • a node device characterized in that a number of working lines are notified to the transmitting end, and in connection with the transmitting end, these corresponding working lines are replaced with a protection line.
  • a line whose transmission quality is lower than a predetermined lower limit value is given priority to one of the protection lines in ascending order of the transmission quality in cooperation with the transmission source. Is replaced by
  • the above-mentioned object is achieved by selecting any one of a plurality of N working lines.
  • the transmission quality of the line falls below the threshold, all or part of these transmission qualities are notified to the transmitting end, and in conjunction with the transmitting end, all or part of these lines are replaced with a backup line.
  • This is achieved by a node device characterized by a point.
  • a line to be replaced with either a single line or a plurality of n protection lines is determined not by the receiving end according to the present invention but by these lines. Delegated to the opposite sender via
  • the transmission quality notified to the transmitting end is determined by combining a normal line and a protection line with a sum signal component transmitted from the transmitting end via these protection lines. This is achieved by a node device characterized in that it is limited to the transmission quality of the working line, which can be replaced by a protection line below.
  • connection with the transmitting end is based on the distribution and operation of traffic on the line and the protection line, even if a failure occurs or the transmission quality is deteriorated among multiple N lines. Attempted only on lines that can be replaced under circumstances or other conditions.
  • the above-mentioned object is achieved by a node device characterized in that the transmission end is notified preferentially of the transmission quality of a line of high importance among the working lines that can be substituted.
  • Such a node device is flexible with respect to the attributes of a plurality of N lines and the combination of components of the sum signal that is set in advance based on the attributes and individually transmitted via the protection line. Therefore, appropriate adaptation is possible.
  • each of the components of the sum signal is a signal to be received via a line that ensures desired transmission quality and / or reliability among a plurality of N lines.
  • multiple N lines and smaller than the multiple N Redundant N lines are formed with the receiving end via one or more n protection lines.
  • each sum signal is received via a protection line that ensures desired transmission quality and / or reliability among n protection lines. This is achieved by a node device.
  • the combination of the number n of the protection lines and the lines to be replaced by these protection lines is set as a mode in which desired service quality and reliability are achieved.
  • the above-mentioned purpose is that the signals x and y transmitted in parallel through the first line and the second line and the signals x and y transmitted through the third line, A signal z provided as a function of these signals x and y is received, and other signals X and y whose phases are equal to these signals x and y are received from the signal z.
  • This is achieved by an instantaneous disconnection switching device that reproduces and appropriately selects one of these individually paired signals X and y. Is
  • a single line used for transmitting the signal z is formed as a redundant line between the transmitting end of the signals X and y.
  • two pairs of signals X and y which are received in parallel via different lines and whose phase differences are compensated, are constantly obtained, so that the above-mentioned selection is made. Switching can be performed without any interruption irrespective of the time at which the operation is performed.
  • FIG. 1 is a principle block diagram of first to sixth node devices according to the present invention.
  • FIG. 2 is a principle block diagram of seventh to tenth node devices according to the present invention.
  • FIG. 3 is a schematic view of the eleventh and twelfth node devices according to the present invention.
  • FIG. 4 is a diagram showing Embodiment 1 of the present invention.
  • FIG. 5 is a diagram showing a second embodiment of the present invention.
  • FIG. 6 is a diagram showing a third embodiment of the present invention.
  • FIG. 7 is a diagram showing Embodiment 4 of the present invention.
  • FIG. 8 is a diagram showing a fifth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a principle block diagram of first to sixth node devices according to the present invention.
  • the node device shown in Fig. 1 has multiple N lines 10-:! 1 to -N and one or more protection lines 1 1-:! to 1 1-n connected to one end of receiving means 12 and signal recovery linked to the receiving means 12 Means 13, line monitoring means 14, and line selecting means 15.
  • the principle of the first node device is as follows.
  • the receiving means 1 2 has a plurality of N lines 1 0-:! ⁇ 10-N and multiple N signals individually given through -N and single or multiple n ( ⁇ N) protection lines 11-1-:! ⁇ 11 -n individually given via -n And a plurality n of sum signals corresponding to the sum of all or some of these signals while correcting their phase differences.
  • the signal restoring means 13 calculates the difference between the sum of the single or plural n signals received by the receiving means 12 and the combination of the plural N signals as the plural N lines 10-:! Recover all or some of the N individual signals to be received via ⁇ 10-N.
  • the line monitoring means 14 individually determines the correctness (for example, a line having a high error rate) of the plurality N of the lines 10-1 to 10-N.
  • the line selecting means 15 is a circuit for which the result of the discrimination performed by the line monitoring means 14 of the plurality of N signals, all or a part of which has been restored by the signal restoring means 13, is false (eg, For example, a signal corresponding to a line with a high error rate, etc.) is applied instead of a signal received via that line.
  • a signal to be received through a line in which a failure has occurred or transmission quality has deteriorated among a plurality of N lines 10 0 -1 to 10 -N As long as it is included as a component in any of the above-mentioned sum signals of n together with only the signal individually received through all or a part of the normal line, it is accurately restored as an alternative signal.
  • the total number of lines to be laid in the transmission section to which the present invention is applied is the number of lines 10-1 to 10-N out of a plurality of N, and the above-mentioned failures and degradation of transmission quality occur simultaneously in parallel.
  • the conventional example every line is duplicated compared with, in addition to avoiding reduction in reliability is suppressed and while interruption to a minimum, maintenance and operations involved in the operation of labor saving and La N'ningukosu reductions and the second according to c present invention is achieved
  • the principle of the node device is as follows.
  • the signals individually given through all or some of the N-number of circuits 10-1 to 10-N are components of the sum signal of different p ( ⁇ n) among the sum signals of n. Included in common.
  • the signal restoring means 13 outputs a signal for which the result of the discrimination made by the line monitoring means 14 is true among the single or plural sum signals received by the receiving means 12 (for example, the line quality Is obtained via only a good line), and by taking the difference from the single or plural P ( ⁇ N) signals received by the receiving means 12, the plural N lines 10 0 -1 to 1 Recover all or some of the multiple N individual signals to be received individually via all or some of 0-N.
  • the principle of the third node device according to the present invention is as follows.
  • the sum signal of a plurality n is a single or a plurality of n protection lines 1 1-:! It is given as a signal corresponding to only the payload via ⁇ 11-n.
  • the line monitoring means 14 is provided through a plurality of N lines 10-1 to 10-N, and includes the above-mentioned payload among the individual signal components received by the receiving means 12. These lines 10 0-:! It is determined whether 10-N is correct.
  • the fields other than the payload to be transmitted via these multiple lines 10 -1 to 10 -N and the single or multiple n protection lines 11 -1 to 11 -n can be applied without any restrictions on the format and content.
  • the principle of the fourth node device according to the present invention is as follows.
  • the plural N signals and the single or plural n sum signals are given as a sequence of frames based on a prescribed frame configuration.
  • the line monitoring means 14 converts the bit error associated with the plurality of N signals provided through the plurality of lines 10-1 to 10-N and received by the receiving means 12 into the frame defined above. Correct based on configuration.
  • the protection line 11-:! to 11 -n has a true failure or It is effectively applied to replace a line whose transmission quality has deteriorated.
  • the principle of the fifth node device according to the present invention is as follows.
  • the line monitoring means 14 obtains the transmission quality of each of the plurality of N lines 10 -1 to 10 -N.
  • the line selection means 15 is for each of the plurality of N lines 10 -1 to 10 N which are obtained by the line monitoring means 14 and correspond to the ascending order of transmission quality below the specified lower limit. Then, the signal restored by the signal restoration means 13 is applied instead of the signal received via the line.
  • the transmission quality of the transmission section to which the present invention is applied is kept high overall.
  • the principle of the sixth node device according to the present invention is as follows. All or a part of the receiving means 12, the signal restoring means 13, the line monitoring means 14, and the line selecting means 15 perform all or a part of individual functions as processing of the baseband area.
  • the receiving means 12, the signal restoring means 13, the line monitoring means 14, and the line selecting means 15 are constituted by slower elements than when the same processing is performed in the intermediate frequency band or the radio frequency band. obtain.
  • FIG. 2 is a principle block diagram of seventh to tenth node devices according to the present invention.
  • the node device shown in FIG. 2 has multiple N lines 20-:! to 20 -N and single or multiple n spare lines 2 1-:! To 21-n, a transmission means 22 connected to the receiving means 22, a transmission quality monitoring means 23, a substitution requesting means 24, 24 A and a line selecting means 25. , 25 A.
  • the principle of the seventh node device is as follows.
  • the receiving means 22 includes a plurality of N signals individually given via a plurality of N lines 20-1-20-N, and a single or a plurality of n (N) spare lines 21-1-1 to A single or multiple n signals individually given via 2 1 -n are received while correcting these phase differences.
  • the transmission quality monitoring means 23 monitors the transmission quality of the plurality of N lines 20 -1 to 20 -N, and these lines 20-:! Out of ⁇ 20-N, specify the line whose transmission quality is lower than the predetermined lower limit.
  • the alternative requesting means 24 includes, among the lines identified by the transmission quality monitoring means 23, one or more n spare lines 2 1 -1 to 2 1 -n in the ascending order of the transmission quality. A notification is sent to the opposite transmitting end via the line to the effect that these lines should be individually replaced with one of the spare lines.
  • line 20-:! Out of ⁇ 20-N a line whose transmission quality is lower than the above-mentioned lower limit is preferentially replaced by one of the protection lines in ascending order of transmission quality in cooperation with the transmission source.
  • the efficiency of the protection line can be reduced more efficiently than in the conventional example in which individual lines are duplicated. Utilization and overall cost reduction including running costs will be achieved.
  • the principle of the eighth node device is as follows.
  • the receiving means 22 includes a plurality of N signals individually given via a plurality of N lines 20-1 to 20-N and a single or a plurality of n (N) spare lines 21-1 to 1--1. It receives single or multiple ⁇ signals individually given via 2 1 -n while correcting these phase differences.
  • the transmission quality monitoring means 23 monitors the transmission quality of a plurality of 2 lines 20-:! to 20 - ⁇ , and among these lines 20 -1 to 20 - ⁇ , the transmission quality is a predetermined lower limit. Identify lines below the value You.
  • the alternative requesting means 24 A is one or more n of the protection lines 2 1 -1 to 2 1 -n of the lines identified by the transmission quality monitoring means 23 in the ascending order of the transmission quality.
  • a notification indicating these lines and transmission quality is sent to the opposite transmitting end via the number of lines.
  • the line selecting means 25A in cooperation with the transmitting end in response to the notification sent by the substitute requesting means 24A, specifies a spare line which substitutes each line indicated by the notification, and Instead of the signals received via the individual lines, the signals provided via the corresponding protection line and received by the receiving means 22 are applied.
  • the principle of the ninth node device is as follows.
  • the receiving means 22 is provided individually via the single or multiple n spare lines 1 1-:! to 1 1 -n, and receives a plurality of n signals corresponding to the sum of all or some of the N signals. Receive the sum signal.
  • the alternative request means 24 A is a normal line between a plurality of N lines 20-:! ⁇ 20 -N and a single or a plurality of n spare lines 21-:! ⁇ 21-n. Only the lines that can be replaced by the protection line under the combination of the protection line and the sum signal component transmitted from the transmitting end via these protection lines indicate the line and the transmission quality. Send a notification.
  • the link with the transmitting end is made up of multiple N lines 20-:! -20 -N Even if a failure has occurred or the transmission quality has deteriorated, the line and the protection line 2 1-:! Traffic distribution of ⁇ 2 1-n, operation status Only attempted on lines that can be replaced under other conditions.
  • the principle of the tenth node device according to the present invention is as follows.
  • the substitution requesting means 24A sends a notification preferentially to the lines that can be substituted and that correspond to the descending priority order given individually as an attribute.
  • the attributes of a plurality of N lines 20- :! to 20-N are set in advance based on the attributes, and are individually transmitted via the protection lines 21- :! to 21-n. Flexible and precise adaptation to the combination of components of the sum signal to be performed is possible.
  • FIG. 3 is a principle block diagram of the eleventh and twelfth node devices according to the present invention.
  • the node device shown in FIG. 3 is composed of transmitting means 31 connected to one end of a plurality N of circuits 30 -1 330 -N, and one or a plurality of n spare lines 3 2 -1 to 3 2 -n And sum signal transmitting means 33 connected to one end of the signal.
  • the principle of the eleventh node device according to the present invention is as follows.
  • the transmission means 31 includes a plurality of N circuits 30- :! Transmit multiple N signals to ⁇ 30-N respectively.
  • the sum signal transmitting means 33 is connected to all or some of the plurality of N circuits 3 0-:! to 30 -N, in which the desired transmission quality and / or reliability is secured.
  • the signal to be transmitted by the transmission means 31 is added while correcting the difference between the individual phases. Further, the sum signal transmitting means 33 transmits the sum signal obtained as a result to one or more of n ( ⁇ N) protection lines 3 2-:! to 3 2 -n. Send.
  • the principle of the twelfth node device according to the present invention is as follows.
  • the sum signal transmitting means 3 3 has a plurality of N circuits 3 0-:! ⁇ 30 -N and single or multiple n ( ⁇ N) protection lines 3 2-:! Of the combinations with ⁇ 32-n, individual combinations in which a failure occurs in parallel or the probability that the transmission quality deteriorates is less than or equal to the desired upper limit, and is assigned to the spare line belonging to that combination A sum signal including a signal component to be transmitted via each line belonging to this combination is transmitted.
  • the protection line 3 2-:! The combination of the number n of ⁇ 32-n and the lines which should be replaced by these protection lines 32-1 ⁇ 32-n is set as a mode to achieve the desired service quality and reliability. Is done.
  • the principle of the instantaneous interruption switching device according to the present invention is as follows.
  • the first reproducing means 35 performs a predetermined operation defined by a function g (x, z) on the first signal X and the third signal z received by the receiving means 34.
  • the second signal y is reproduced by the application.
  • the second reproducing means 36 is defined by the function]! (Y, z) of the second signal y and the third signal z received by the receiving means 34.
  • the first signal X is reproduced by performing a predetermined operation.
  • the phase compensating means 37 is reproduced by the first signal X received by the receiving means 34 and the second reproducing means 36, or is to be reproduced. Compensates for the phase difference with one signal X, and Between the second signal y received by the communication means 34 and the second signal y to be reproduced or reproduced by the first reproduction means 35 In addition to compensating for the phase difference, the phase-compensated signal is output separately.
  • the first selecting means 38 is reproduced by the first signal X received by the receiving means 34 after the phase difference compensation and by the second reproducing means 36 after the phase difference compensation.
  • first selecting means 38 and the second selecting means 39 have two signals received in parallel via different lines and the phase difference of which is compensated.
  • a first signal X and two second signals y are each given constantly.
  • the redundant line described above is shared for the redundant transmission of the first signal X and the second signal y, and the redundant line and the first signal X If the failure occurs in either the transmission line for the transmission of the signal and the second signal y, or the failure is recovered, the first selection means is used. 38 and the second selection means 39 can change the system configuration asynchronously and without instantaneous interruption of the first signal X and the second signal y. it can .
  • FIG. 4 is a diagram showing Embodiment 1 of the present invention.
  • the node device 40T has two working transmission lines (hereinafter referred to as “working transmission lines”) 41a-1 and 41a-2, and a single spare transmission line (hereinafter referred to as a “working transmission line”). , Called “spare transmission line.” 4) Connected to one end of 1s.
  • the node device 40T has two sets of pluralities to be multiplexed based on the STM method and to be transmitted to the above-mentioned working transmission lines 41a-l and 41a-2, respectively. A sequence of N transmission information is given.
  • a node device 40 R is connected to the other end of the working transmission lines 41 a-1 and 41 a-2 and the protection transmission line 41 s, and these working devices are connected to the output of the node device 4 OR.
  • Two transmission information sequences received via one of the transmission lines 4 la -l and 41 a -2 and the spare transmission line 41 s and corresponding to the two sets of transmission information sequences described above are obtained.
  • the node device 40T includes the following elements.
  • Transmission information redundancy unit (EXO) 4 3 having two inputs directly connected to the outputs of these multiplexing units 4 2 -1 and 4 2 -2
  • Each of the multiplexing sections 4 2 -1 and 4 2 -2 and the transmission information redundancy section 4 3 are arranged at the subsequent stage, and the working transmission paths 4 1 a -l and 4 1 a -2 and the protection transmission path 4 1 Line corresponding part directly connected to one end of s (INS) 4 4 a -1, 4 4 a -2 s 4 4 s
  • a synchronous signal generation unit 45 having an output directly connected to these line corresponding units (INS) 44a-1, 44a-2, and 44s insert inputs
  • the node device 4OR is composed of the following elements. -Line corresponding parts (BUFF) 45 a -l, 45 a -2, directly connected to the other end of the working transmission line 41a -l, 41a -2 and the protection transmission line 41s 4 5 s
  • the arithmetic unit 4 7 -1 having two inputs directly connected to outputs corresponding to the line corresponding units 45 a-l and 45 s, respectively.
  • a line selection unit 4 8 -1 having two inputs directly connected to an output corresponding to the line corresponding unit 45 al and an output of the arithmetic unit 47-2 among the three outputs of the phase adjustment unit 46.
  • a line selection unit 4 8 having two inputs directly connected to the output corresponding to the line corresponding unit 45 a-2 and the output of the operation unit 47-1 -3
  • Demultiplexers 4 9-1 and 4 9 -2 connected in cascade to these line selectors 4 8-1 and 4 8 -2, respectively, and arranged at the last stage
  • the multiplexing units 42-1 and 42-2 multiplex the two sets of transmission information sequences described above, and add a header suitable for a predetermined frame configuration. This creates a "multiplexed signal" in which each piece of transmitted information is placed in a time slot that should be applied exclusively to that transmission. For simplicity, it is assumed below that these “multiplexed signals” have the same phase in bits and are synchronized with each other.
  • the transmission information redundant unit 43 generates a single bit sequence by taking the exclusive OR of these two bit sequences given as “multiplexed signals”. In the following, such a single bit string is shown. In the following, the pulse train is simply referred to as “redundant signal” for simplicity.
  • the synchronization signal generator 45 is adapted to the transmission schemes of the working transmission paths 41a-1, 41a-2 and the spare transmission path 41s, and has the above-mentioned "multiplexed signal” and “redundant signal”. Generates a synchronization signal (header, etc.) synchronized with.
  • the line-corresponding parts 44a-1 and 44a-244s each generate an "STM signal” by adding a synchronization signal corresponding to the "multiplexed signal” and “redundant signal” described above. Then, these "STM signals" are transmitted in parallel to the working transmission lines 41al and 41a-2 and the protection transmission line 41s.
  • the line-corresponding parts 45 al, 45 a -2 and 45 s are respectively used for the working transmission lines 41 a-1 and 41 a -2 and the protection transmission line 4.
  • the “STM signal” given via Is is fetched, and these “STM signals” are given to the phase adjustment unit 46 in parallel.
  • the phase adjuster 46 uses these “STM signals” due to differences in the transmission paths and transmission characteristics of the working transmission paths 41 a-1 and 41 a-2 and the protection transmission path 41 s described above. Is corrected. Therefore, the ⁇ STM signal '' provided via the working transmission lines 41al and 4la-2 and the protection transmission line 4Is is the same as the NRZ signal which is updated simultaneously in bit units. Then, it is given to the operation units 47-1, 47-2 and the line selection units 48-.1, 48-2.
  • the operation unit 47-2 performs the exclusive OR operation of the "STM signal” received through the working transmission path 41a-2 and the protection transmission path 41s, respectively, to thereby perform the above-described operation.
  • the “multiplexed signal” generated by the multiplexing unit 4 2-1 in the node device 40 T as the transmitting end is included in the payload. Signal.
  • the operation unit 47-1 determines that the “STM signal” received via the working transmission path 1 a-1, not the working transmission path 41 a-2, is to be processed. Except for this, as described above, by performing the same operation as the operation performed by the operation unit 47-2, the “multiplexing” generated by the multiplexing unit 42-2 in the node device 40T as the transmitting end is performed. A "second redundant multiplex signal" is generated that includes the "signal" in the payload.
  • the line selection unit 48-1 provides the transmission quality of the "STM signal” directly provided by the phase adjustment unit 46 and received via the working transmission line 41a-1 based on a predetermined standard. Monitoring, and when the transmission quality is good enough to satisfy this criterion, the “STM signal” is given to the demultiplexing unit 49.
  • the line selector 48-1 generates the "first redundant multiplexed signal" generated by the arithmetic unit 47-2. Is given to the demultiplexing section 49-1 instead of the “STM signal” described above.
  • the transmission quality is monitored for the "STM signal” given by the working transmission line 41a-2, and for the "first redundant multiplexed signal”. , Except that the above-mentioned “second redundant multiplexed signal” is applied instead of the above, the processing is the same as that performed by the line selection unit 48-1 as described above. Is omitted.
  • the transmission quality of the other working transmission path and the protection transmission path 41 s for both the working transmission paths 41 a-1 and 41 a-2 is as described above.
  • the STM signal extracted from the "STM signal” received via the protection transmission line 41 s and received when the applicable working line is normal, as long as the STM signal is good enough to satisfy the specified criteria.
  • the "first redundant multiplex signal” (or “second redundant multiplex signal”) of the same phase that can replace "" is restored.
  • the system configuration can be updated without interruption without any transmission information being lost.
  • the node devices 40 T and 4 OR Between them, there is formed a redundant transmission line in which a single spare transmission line 41s common to the two working transmission lines 41a-1 and 41a-2 is laid.
  • FIG. 5 is a diagram showing a second embodiment of the present invention.
  • selectors 6 1-1 and 6 1-2 are provided in place of the line selectors 48-1 and 48-2, A bit having three inputs connected to the first to third outputs of the adjustment unit 46 and two outputs individually connected to the selected inputs of these selectors 6 1-1 and 6 1 -2 An error detection unit 62 is added.
  • the bit error detection unit 62 is a component of the “STM signal” which is given through the phase adjustment unit 46 and received via the working transmission path 41 a-1 (41 a-2). Among them, the bit error rate is uniquely determined based on a predetermined frame configuration. The bit error rate of only the erase is monitored, and it is determined whether or not the bit error rate is lower than a specified upper limit.
  • the bit error detection unit 62 informs the selector 6 1-1 (6 1 -2) of “the current transmission path 4 1 a ⁇ 1 (4 1a -2) and the ⁇ STM signal '' given via the phase adjustment unit 46 should be given to the demultiplexing unit 49-1 (49-2) ''. Give a selection signal.
  • the bit error detection unit 62 informs the selector 6 1-1 (6 1 -2) of “the operation unit 4 7 -2 (4 7-1 ) Is to be given to the demultiplexing unit 49-1 (49-2). . That is, the transmission quality of the working transmission lines 41a-1 and 41a-2, or the determination of whether any failure has occurred in these working transmission lines 41a-1 and 41a-2, It is performed based on the transmission quality related only to the pay mouth that is adapted to the frame configuration, not the frame configuration of the “STM signal” described above.
  • the accuracy of monitoring the transmission quality of the working transmission lines 41a-1 and 41a-2 is improved, and the system can be flexibly adapted to various system configurations. Becomes possible.
  • FIG. 6 is a diagram showing a third embodiment of the present invention.
  • the difference between the embodiment shown in FIG. 4 and the present embodiment lies in that a node device 70R is provided instead of the node device 40R.
  • the error correction units 72-1 and 72-2 perform CRC and other operations on the signals included in the following combinations, respectively, and detect and logically detect the bit in which the bit error has occurred. Perform the correction in parallel with the value.
  • the line selection section 7 1 -1 (7 1 -2) receives the ⁇ STM signal '' received through the working transmission path 4 1a -1 (4 1a -2) and given by the phase adjustment section 46. As long as the transmission quality of the signal does not fall below the predetermined lower limit, the "STM signal” and the “first redundant multiplexed signal” ("second redundant signal") given by the arithmetic unit 47-2 (47-1) Multiplexed signal ”) and one of the signals with few bit errors is determined based on the predetermined frame configuration. The one signal is supplied to the demultiplexing unit 49-1 (49-2). .
  • the system configuration Frequent updating is avoided, and the spare transmission path 1 s is properly used in place of the working transmission path whose transmission quality has deteriorated to an unacceptably low level.
  • This embodiment is realized by providing the line selection units 71-1 and 71-2 in place of the line selection units 48-1 and 48-2 in the above-described first embodiment. I have.
  • the present embodiment is not limited to such a configuration.
  • the line selectors 71-1 and 71-2 also serve as the selectors 61-1 and 61-2 shown in FIG.
  • the provision of the bit error detection unit 62 shown in FIG. 6 may be realized together with the second embodiment described above.
  • FIG. 7 is a diagram showing Embodiment 4 of the present invention.
  • a node device 8OR is provided instead of the node device 6OR.
  • a bit error detection unit 81 is provided instead of the bit error detection unit 62.
  • the feature of the present embodiment lies in the following processing procedure performed by the bit error detection unit 81.
  • the bit error detector 81 receives the signal via the working transmission lines 41 al and 41a-2 in the same manner as the bit error detector 62 shown in FIG. In each of the fields of the frame provided as the “STM signal” through the interface, bit errors are monitored only for the payload.
  • bit error detection section 81 determines whether or not these bit error rates are below respective prescribed upper limits, and both or one of the results of these determinations is false. In this case, a process is performed based on the same procedure as the process performed by the bit error detection unit 62 in the embodiment shown in FIG.
  • the bit error detection unit 81 selects one of the “STM signals” described above, which has a larger bit error rate of the payload.
  • STM signal (hereinafter referred to as“ degraded STM signal ”).
  • bit error detection unit 81 selects one of the selectors 61-1 and 61-2, one of the working transmission lines (code “41 a”) corresponding to the transmission line of the “degraded STM signal”. Select the “first redundant multiplex signal” or “second redundant multiplex signal” given by the operation unit (shown by “47”) in one selector corresponding to). Give a selection signal that means what to do.
  • the signal is received via the backup transmission line 41s.
  • the “STM signal” is used efficiently, and degradation of transmission quality is suppressed to a small extent.
  • the present invention is applied to the embodiment shown in FIG. 5, but in the present invention, the transmission qualities of both the working transmission paths 41 a1 and 41 a-2 are desired in parallel.
  • the configuration is not limited to such a configuration as long as it is monitored in form and accuracy, and application to any of the above-described embodiments is also possible.
  • FIG. 8 is a diagram showing a fifth embodiment of the present invention.
  • a node device 9 ORt is provided instead of the node device 8 OR, and the configuration is the same as that of the node device 9 ORt.
  • a node device 9 OT r is provided in place of the node device 40 ⁇ , and a full-duplex working transmission line (41 a-lUs 41) is provided between the node devices 9 OR t and 9 OT r. a-1D), (41a-2U, 41a-2D) and full-duplex protection transmission lines (41s-U, 41s-D).
  • the node device 9 ORt and the node device 8 OR shown in FIG. The difference of the configuration is that a bit error rate detection section 91 R is provided instead of the bit error rate detection section 81, and the configuration shown in FIG. 7 is the same as that of FIG. 7 except for the following points (a) to (c).
  • a transmission unit 92 R connected to one end of the working transmission lines 41 a-1U, 41 a-2U and the protection transmission line 41 s-U is provided. It is in the point.
  • node device 9 Among the components of the node device 9ORt, those having the same functions and configurations as those provided in the node device 8OR described above (excluding the transmitting unit 90R and a transmitting unit 90T described later). ) Is indicated by adding the letter “R” to the end of the code shown in FIG. 8, and the description is omitted here.
  • the components of the transmitting section 92R are provided in the above-described node device 90Tr, and the components of the transmitting section 92T having the same configuration as the transmitting section 92R are the same as those of the transmitting section 92R. In order to distinguish them, "R" is added as the first suffix to the code shown in FIG.
  • Multiplexing sections 94-Rl and 94-R2 are provided instead of the multiplexing sections 42-1 and 42-2, and the multiplexing sections 94-Rl and 94-R2 are provided.
  • the corresponding output of the bit error rate detector 91 R is connected to a specific input.
  • bit error rate detectors 91 R and 91 T provided in the node devices 90 Rt and 90 Tr respectively, the multiplexing units 94 -Rl and 94- R2, 94-Tl, 94- ⁇ 2, and selectors 93R, 93T are in the following processing procedure.
  • the bit error rate detection section 91 R (91 T) uses the current transmission path 41 a-ID, 41 a--2D (41 a- As long as the transmission quality of either 1U or 4 1a -2U) exceeds the predetermined lower limit, the output of the transmission information redundancy unit 43-R (43-T) is output to the line corresponding unit 44s-. R (44 s -T) should be given to the selector 93-R (93-T), and without any connection to the transmitter 92R (92T). The same processing as in the embodiment 41 is performed.
  • bit error rate detector 91R performs a series of processing described below. Do.
  • One of the selectors 61 R-1 and 61 R-2 corresponding to the specific transmission path is sent to the selector corresponding to the “multiplexed signal (phase adjustment) received via the protection transmission path 41 s-D. This is given by the unit 46R without passing through any of the arithmetic units 47-1, 7R-2.)
  • the multiplexing units 94-Rl and 94-R2 multiplex such a message into the transmission information described above based on a predetermined frame configuration, and The resulting "multiplexed signal" is given to a-Rl, 44a-R2 and the transmission information redundancy unit 43-R.
  • the above-mentioned message is transmitted to the node device 9OTr via all or a part of the working transmission paths 41a-1U and 41a-2U and the protection transmission path 41s-U. You.
  • the bit error rate detector 91T identifies such a message and gives the selector 93-T an identifier included in the message.
  • the selector 9 3 T instead of the "redundant signal” provided by the transmission information redundancy unit 4 3 -T, active transmission line 4 1 a -1 of D N 4 1 a -2D, represented by this identifier
  • the “multiplexed signal” given by the multiplexing unit (indicated by either “94- ⁇ 1” or “94-T2”) corresponding to one of the working transmission lines is sent to the line corresponding unit 44 s- ⁇ .
  • the transmission quality is maintained higher than in the other embodiments in which the working transmission line having the lowest transmission quality is not necessarily replaced by the spare transmission line 41s-D. .
  • the transmission quality is low specific transmission path bi Uz preparative error detection unit 9 1 R identified by R and node device 9 0
  • such a specific transmission path may be identified by the node device 90Tr, for example, by applying the following configuration.
  • the bit error rate detection unit 91R passes the individual transmission qualities of the working transmission lines 41a-1D and 41a-2D to the node device 9OTr as the messages described above. Know.
  • the bit error rate detection unit 9IT uses the current transmission path (code “41a-lD”) corresponding to one of the transmission qualities acquired as the above-mentioned message, which is lower. , “41a-2D”) is identified as a specific transmission path.
  • a spare transmission line 41 s-D is provided to be used as an alternative to any of these working transmission lines 41a-1D and 41a-2D.
  • the number of such active transmission lines in the node device 90Tr may be "3" or more.
  • the node device 90 Tr can identify these transmission qualities as in the present embodiment, For example, of these working transmission lines, one or more working transmission lines having high transmission quality and working transmission lines having a transmission quality exceeding the lower limit described above but having a low transmission quality are low.
  • An "STM signal” is generated as an exclusive OR of a plurality of "multiplexed signals” to be transmitted and transmitted, and this "STM signal” is transmitted to the spare transmission path 41s-D.
  • the combination of these "multiplexed signals” is notified to the node device 9ORt as appropriate, so that the overall transmission quality may be maintained at a high level. .
  • the present invention is not limited to such transmission sections.
  • the number P of working transmission paths is equal to or more than “3” and
  • the present invention can be similarly applied to a receiving end of a transmission section in which less than P spare transmissions are laid, or a node device provided at the receiving end and the transmitting end.
  • the number of such spare transmission paths may be the following number or any other number as long as the number is less than P described above.
  • the system configuration to be applied to the redundantly configured transmission path is not a feature of the present invention, and the following technology and other various known technologies can be applied. Therefore, the description of the operation performed by each unit in cooperation with each other is omitted here.
  • the protection transmission line 4Is (41s-D) is used for the failure and transmission quality of the working transmission lines 41a-1 and 41s-2 (4la-IDs41s-2D). Depending on the degradation and the recovery from these failures or the degradation of transmission quality, it is appropriately applied as a substitute for any of the active transmission paths based on a predetermined algorithm.
  • the spare transmission path 41 s is exclusive of individual transmission information to be transmitted via the working transmission paths 41 a-l and 41 a-2. It is used to transmit “redundant signals” obtained as logical OR.
  • the transmission information to be superimposed as the exclusive OR on the “redundant signal” to be transmitted via these spare transmission lines is Among the working transmission lines that can realize a redundant configuration by applying the transmission line, if the probability that a failure occurs in parallel with the corresponding backup transmission line or the transmission quality deteriorates is less than the desired upper limit value It may be limited to the transmission information to be transmitted via the working transmission path which can be regarded.
  • the transmission path for each transmission section depends on the number and combination of transmission information to be transmitted as a “redundant signal” component via each of the backup transmission paths. It is possible to adapt to the redundant configuration and to secure desired reliability and service quality.
  • the above-described “redundant signal” is generated by taking the exclusive OR of the transmission information in the baseband area.
  • the present invention is not limited to such a configuration. For example, if the following conditions are satisfied under the characteristics and performance of each unit, individual transmission information is synthesized in a radio frequency band or a desired intermediate frequency band. Thus, a “redundant signal” may be generated.
  • the spare transmission line 41 s (41 s- The transmission information included in the “redundant signal” transmitted via D) is applied, or the working transmission line (hereinafter referred to as “replacement signal”) to be replaced by the spare transmission line 41 s (41 s -D) , which is simply referred to as “substituted transmission path.”) Is determined according to whether a failure has occurred or the degree of deterioration of transmission quality.
  • the present invention is not limited to such a configuration, and the number of the working transmission lines and the backup transmission lines and the transmission information to be superimposed on the “redundant signal” transmitted through these backup transmission lines are not limited. Irrespective of the combination of Is also good.
  • the reduction in reliability is minimized and the maintenance and operation are performed while avoiding instantaneous interruption. Labor saving of related work and reduction of running cost are achieved.
  • the replacement of a desired line by any one of these protection lines can be realized with high accuracy.
  • the format and contents of the fields other than the payload to be transmitted via the plurality of lines and the single or the plurality of n protection lines are described. Various restrictions can be applied without any restrictions.
  • the protection line truly fails, as compared with the case where no bit error is corrected. Alternatively, it is effectively applied to replace a line whose transmission quality has deteriorated.
  • the transmission quality is generally kept high.
  • the total cost including the running cost can be reduced along with the simplification of the hardware configuration.
  • the seventh node device when a fault occurs or a line whose transmission quality is degraded is replaced with some kind of protection line, the transmission characteristics between the relevant line and the protection line are changed. As long as the differences can be accommodated at the desired speed and accuracy, compared to the conventional case where each line is duplicated, efficient use of the spare line and reduction of overall costs including running costs Is achieved.
  • the eighth node device can be flexibly applied to a communication control method in which a line to be replaced with a protection line is to be selected at the transmitting end.
  • the service quality is maintained higher and the resources are effectively used as compared with a case where invalid linkage with the transmitting end can be performed.
  • the tenth node device has a more flexible adaptation to various maintenance and operation needs than when no standard is set for selecting a line to be replaced with a protection line. It becomes possible.
  • the eleventh node device compared to a case where all of a plurality of lines are duplicated, the overall configuration including simplification of the configuration, improvement of reliability, and running cost is improved. Cost reduction

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  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

L'invention concerne un dispositif nodal qui est raccordé à une extrémité d'une ligne redondante et est conçu pour exécuter une commande de communication prédéterminée. L'invention concerne également un dispositif d'interruption non brève. Le nombre de lignes auxiliaires est petit et la structure système peut être changée sans brève interruption conformément à l'état des différentes lignes couramment utilisées. Le dispositif nodal corrige les déphasages entre les signaux reçus séparément par N lignes et le signal de somme de l'ensemble ou partie des signaux par une seule ou n (<N) ligne(s) auxiliaire(s) ; il récupère l'ensemble ou partie des signaux devant être reçus par les N lignes comme leurs différences, et il utilise les signal récupéré correspondant comme substitut du signal reçu par une ligne défectueuse.
PCT/JP2000/002956 2000-05-09 2000-05-09 Dispositif nodal et dispositif d'interruption non breve WO2001086926A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2000/002956 WO2001086926A1 (fr) 2000-05-09 2000-05-09 Dispositif nodal et dispositif d'interruption non breve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2000/002956 WO2001086926A1 (fr) 2000-05-09 2000-05-09 Dispositif nodal et dispositif d'interruption non breve

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56132839A (en) * 1980-03-24 1981-10-17 Nippon Telegr & Teleph Corp <Ntt> Digital radio circuit switching system
JPS5797749A (en) * 1980-12-10 1982-06-17 Fujitsu Ltd Synchronous switching system without momentary break
EP0420648A2 (fr) * 1989-09-29 1991-04-03 AT&T Corp. Codage à diversité pour réseaux de communications auto-régénérables transparents
JPH04248717A (ja) * 1991-02-04 1992-09-04 Toshiba Corp 多重化切替回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56132839A (en) * 1980-03-24 1981-10-17 Nippon Telegr & Teleph Corp <Ntt> Digital radio circuit switching system
JPS5797749A (en) * 1980-12-10 1982-06-17 Fujitsu Ltd Synchronous switching system without momentary break
EP0420648A2 (fr) * 1989-09-29 1991-04-03 AT&T Corp. Codage à diversité pour réseaux de communications auto-régénérables transparents
JPH04248717A (ja) * 1991-02-04 1992-09-04 Toshiba Corp 多重化切替回路

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