JP2005117607A - Fault block determination system, scrambler, descrambler, and digital signal pattern generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for determining a fault block on a digital line from an input signal and an output signal of one device arranged on the line in the case of line fault without affecting communication between users at an ordinary time. <P>SOLUTION: In the fault block determination system, a scrambler and a descrambler are arranged on the relevant line, the scrambler has a polynomial for scrambling a series of "0" and a series of "1" to any series other than "1" independently of a status of a shift register and when an input signal of the descrambler is a series of "1", it is determined that a fault block exists between the scrambler and the descrambler. When an output signal of the descrambler is a series of "1", it is determined that a fault block exists far from the scrambler. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present application relates to a failure section determination system, and more particularly, to a system that makes it possible to determine a failure section of a digital line.

  Conventionally, a signal called AIS (Alarm Indication Signal) described in G series of ITU-T recommendation is known as a failure notification signal in a digital transmission line. This is because, in a multiplexed transmission line, when an out-of-synchronization failure occurs in the high-order group transmission line, a “1” continuation without a frame signal is sent to the low-order group transmission line, and the low-order group transmission line termination device transmits the high-order group transmission. It recognizes road obstacles.

  In a digital line using time division multiplexing, there is no AIS between the lines connected via the time division multiplexing apparatus because there is no concept of the next group. However, even in time division multiplexing, when there is no signal to be transmitted due to a failure, it is a common technique to add a frame signal and transmit “1” to the time slot of the line portion.

  Therefore, the user of the digital line can detect the failure by receiving “1” sequence.

  However, the user cannot determine the failure section. For example, a failure when the user on the sending side removes the data transmission terminal at home, that is, a failure having a failure section outside the responsibility section of the communication carrier, and a failure within the network, that is, a failure within the responsibility section of the communication carrier Both faults with a section are indistinguishable because they receive a “1” sequence.

  This is a significant barrier for the user to monitor service quality, i.e. confirm the carrier's fulfillment. In other words, there is no distinction between the inside and outside of the carrier's responsibility section. In recent years, when a failure occurs in a telecommunications carrier's responsibility section, the user has actively requested the telecommunications carrier for a contract form called SLA that asks for the return of the fee.

  On the other hand, looking at the configuration of today's digital lines, there are many examples of so-called interconnections that span multiple operators. This is because of the social background such as the separation of former oligopolistic companies, the rapid increase in the number of participants in the telecommunications business, and the excessive supply of installed optical fiber.

  In the interconnection, it is impossible to monitor the status of the connected service provider, and network operation information in general can only be obtained by inquiries such as telephone and e-mail. This is because the monitoring information indicating the state of the communication device is closed under the monitoring system of each business operator.

  Even between telecommunications carriers, the information obtained by answering the above inquiries contains a lot of abstract and subjective content, and it is very easy to obtain objective information such as history data of communication devices. As a result, it is difficult to determine the faulty section.

  In view of the above problems, it is an object of the present application to provide a system capable of determining a faulty section of a digital line. More specifically, to provide a system that can determine a failure section according to the input and output states of one device arranged on a line at the time of failure without affecting communication between users in normal times. With the goal.

  In order to solve the above-mentioned problem, the failure section determination system of the present application is a failure section determination system for a digital line as a solution to the above-described problem, and is “1” on a line between a transmission terminal and a reception terminal. A scrambler with a polynomial that outputs a value other than “1” continuous regardless of the contents of the shift register at the time of continuous input is arranged, and a descrambler having the same polynomial as the scrambler is placed between the scrambler and the receiving terminal. If the descrambler input signal is “1” continuous, it is determined that there is a fault section between the scrambler and the descrambler, and the descrambler output signal is “1” continuous. For example, it is determined that a failure section exists between the scrambler and the transmission terminal.

  By paying attention to the input and output of the descrambler that is one device on the line, it becomes possible to determine the failure section.

For example, 1 + X ⁻² + X ⁻⁷ + X ⁻⁸ is an example of a polynomial in which an output signal is not “1” continuous regardless of the state of the shift register with respect to “1” continuous input signals.

  The scrambler of the present application also includes a “0” continuous detection means for outputting a detection signal when a continuous “0” is detected in a received signal input from the line, and a received signal input from the line. If there is no scrambled scrambled signal output as a scrambled signal and the detection signal input from the “0” continuous detection means, the scramble signal is input when the detection signal is input from the “0” continuous detection means. Has a transmission signal selection means for selecting the received signal as a transmission signal and outputting it to the digital line, and in the polynomial used for the scrambler, the output signal is shifted with respect to the “1” continuous input signal. It is characterized by being other than “1” continuous regardless of the register status.

For example, 1 + X ^-2 + X ^-7 + X ^-8 is a polynomial in which the output signal for a "1" continuous input signal is not "1" continuous regardless of the state of the shift register. Depending on the state, it is possible that a “0” sequence is scrambled to a “1” sequence. Avoid scrambled "0" continuations to "1" continuations, and avoid misjudgment of faulty sections.

  Further, the descrambling device of the present application includes an input “1” continuous detection means for outputting an input “1” continuous detection signal when a continuous “1” is detected in a received signal input from the line, and the line A descrambler that descrambles the received signal input from the receiver and outputs it as a transmission signal to the digital line, and an output that outputs “1” continuous detection signal when the transmission signal detects “1” continuous for a certain period of time. 1 "continuous detection means is provided.

  Further, the scrambler of the present application includes a PN1 detector that outputs a PN1 detection signal when the first signal pattern is detected in the received signal, and a second scrambler in the received signal. PN2 detection means for outputting a PN2 detection signal when a signal pattern is detected, and the transmission signal selection means receives a “0” continuous detection signal input from the “0” continuous detection means and a PN1 detection means. One of the reception signal and the scramble signal is output as a transmission signal according to the state of the input PN1 detection signal and the PN2 detection signal input from the PN2 detection means.

  Further, in the descrambling device of the present application, in the descrambling device, the descrambling means descrambles the input received signal and outputs it as a descrambling signal, and further includes a first signal pattern in the received signal. PN1 detection means for outputting a PN1 detection signal when the second signal pattern is detected, and PN2 detection means for outputting a PN2 detection signal when the second signal pattern is detected in the reception signal. When "0" is detected continuously for a certain period, "0" continuous detection means that outputs "0" continuous detection signal, "0" continuous detection signal input from "0" continuous detection means, and PN1 detection A transmission signal that outputs either the reception signal or the descrambling signal as a transmission signal according to the state of the PN1 detection signal input from the means and the state of the PN2 detection signal input from the PN2 detection means It is characterized by comprising number selection means.

  The digital signal pattern generation device of the present application includes: a PN1 generation unit that outputs a first signal pattern; a PN2 generation unit that outputs a second signal pattern; a transfer selection signal; and the descrambling device according to claim 5. In accordance with the state of the PN1 detection signal and the PN2 detection signal of the descrambling device according to claim 5, the received signal input, the first signal pattern input from the PN1 generation means, and the input from the PN2 generation means Transfer signal selection means for outputting any one of the second signal patterns as a transmission signal is provided.

  The data transmission device of the present application is characterized by including any one of the above scramble devices, descramble devices, or digital signal pattern generation devices as faulty section determination means.

  Further, in the failure section determination system of the present application, in the above-described failure section determination system, any one of the above scramble devices is arranged instead of the scrambler, and any one of the above descramble devices is arranged instead of the descrambler. It is characterized by that.

  Further, the failure section determination system of the present application is the above-described failure section determination system, wherein the scrambler having the PN1 detection means and the PN2 detection means is disposed instead of the scrambler, and the PN1 detection means is replaced with the descrambler. And a failure section determination system in which the descrambling device having PN2 detection means is arranged and the digital signal pattern generation device is further arranged between a data transmission terminal and a data reception terminal.

  In the present application, only the state of “1” continuation of the input signal and output signal of one device, that is, the descrambler, or the descrambling device is used as the basis for the determination of the failure section, and the centralized history data is used for each operator and user. It is possible to define the quality of the responsibility section.

  In the present application, since a scrambler and descrambler using a shift register are used, a complicated protocol is not required, and high-speed processing is possible with simple development.

  If a general scrambler is used, “1” continuous may be output when “0” is continuously input. However, in this application, a scrambler that outputs “0” continuous when “0” is continuously input. By using, it becomes possible to avoid erroneous determination of the fault section.

  In this application, it is possible to avoid misjudgment of faulty sections by using a scrambler with a polynomial that outputs a signal other than “1” continuous regardless of the state of the shift register when “1” is continuously input. It becomes.

  In the present application, when no failure occurs, the scrambler and descrambler operate as a set, and the original signal between users is not affected at all.

  In the present application, no auxiliary maintenance line or the like is required outside the band.

  In the present application, when the processing of the scrambler and the descrambler is stopped and transparent transmission is to be realized, the function can be stopped by sending a specific signal pattern in the band. At the same time, the function can be started by another specific signal pattern. As a result, the function can be easily stopped and started without the need for physical removal.

  In the present application, by incorporating the signal pattern generator in the scramble device, the functions of the scramble device and the descramble device can be stopped and started easily while being inserted into the line.

  In this application, when a remote descrambling device detects a signal pattern that should stop functioning, the signal pattern detection signal output from the descrambling device is diverted as a signal pattern transmission start signal for the scrambler device in the opposite direction. By doing so, it is possible to easily stop and start the functions of all the scramblers and descramblers on the line while the apparatus is inserted in the line.

  Hereinafter, the best embodiment of the present application will be described in detail.

  In the fault section determination system of the present application, a scrambler and a descrambler are arranged between a data transmitting terminal and a data receiving terminal, paying attention to an input signal and an output signal of the descrambler, and “1” for a certain period in the input signal. If the continuity is detected, it is determined that the interval between the scrambler and the descrambler is a failure interval. If the output signal is detected to be “1” continuation for a certain period, the failure interval between the data transmission terminal and the scrambler is detected. It is determined that

  The period for continuous detection of “1” required for the determination is suitably from several tens of milliseconds to several hundreds of milliseconds as a failure detection time that is actually necessary.

  FIG. 1 illustrates the arrangement of scramblers and descramblers in the fault section determination system of the present application. The data transmitted from the data transmission terminal 11 becomes a scramble signal scrambled by the scrambler 12, reaches the descrambler 13, is descrambled to the original signal, and is received by the data reception terminal 14.

  In the fault section determination system of the present application, the arrangement positions of the scrambler and the descrambler are not specified, but as a preferred example, the descrambler is arranged in the vicinity of the data receiving terminal.

  In the fault section determination system of the present application, when a so-called interconnected line with multiple telecommunications carriers is the target of fault section determination, if a scrambler is installed at the demarcation point of the telecommunications carrier, the telecommunications carrier It is very effective from the point of specifying the responsibility interval.

  In the fault section determination system of the present application, a plurality of scramblers and descramblers can be set to increase the number of fault sections to be specified.

In the fault section determination system of the present application, the scrambler and descrambler polynomials need to be a polynomial that scrambles and outputs “1” continuous inputs other than “1” continuous. For example, 1 + X ^-2 + X ^-7 + X ^-8 .

FIG. 2 is a schematic diagram showing a configuration when 1 + X ⁻² + X ⁻⁷ + X ⁻⁸ is used as a polynomial for a scrambler for realizing the fault section determination system of the present application.

FIG. 3 is a schematic diagram showing a configuration when 1 + X ⁻² + X ⁻⁷ + X ⁻⁸ is used as a polynomial in the descrambler for realizing the fault section determination system of the present application.

  FIG. 4 is a schematic diagram showing the configuration of the scrambler that realizes the fault section determination system of the present application. “0” continuous detection means 42 that outputs a “0” continuous detection signal when “0” continuous is detected in the input received signal for a certain period, and the received signal is shifted to “1” continuous shift register. Depending on the state of the detection signal input from the scramble means 41 that scrambles with a polynomial that scrambles other than “1” continuous and outputs as a scrambled signal regardless of the state of Transmission signal selection means 43 is provided for outputting either the signal or the scramble signal as a transmission signal.

  Even when the polynomial that scrambles and outputs other than 1 ”continuous is used for the scrambler,“ 1 ”continuous may be output when“ 0 ”continuous is input. In 43, when the “0” continuous detection signal is input, the received signal is selected as the transmission signal, so that the scramble is substantially stopped, and “1” continuous is output by the scramble stop. This avoids the detection of “1” continuation in the input signal of the opposing descrambler, and as a result, erroneous determination of the faulty section is avoided.

  In practice, several milliseconds are preferable as the period required to detect the “0” sequence.

  FIG. 5 is a schematic diagram showing the configuration of the descrambling device that realizes the failure section determination system of the present application. The input “1” continuous detection means 52 for outputting the input “1” continuous detection signal when the “1” continuous detection is detected in the input reception signal for a certain period, and the reception signal is changed to “1” continuous. Regardless of the state of the shift register, “1” is descrambled by a polynomial that scrambles other than continuous, and descramble means 51 that outputs as a transmission signal, and a fixed period of “1” in the transmission signal input from the descrambling means FIG. 5 is a schematic diagram showing a configuration of a descrambling device including an output “1” continuous detection means 53 that outputs an output “1” continuous detection signal when “continuation is detected”.

  FIG. 6 shows PN1 detection means 62 that outputs a PN1 detection signal when the scrambler further detects the first signal pattern of the received signal, and detects the second signal pattern in the received signal. PN2 detection means 63 for outputting a PN2 detection signal, the transmission signal selection means 61 receives the “0” continuous detection signal input from the “0” continuous detection means 42 and the PN1 detection means 61. Schematic diagram showing a configuration of a scrambler having a feature of outputting either a reception signal or a scramble signal as a transmission signal in accordance with the state of the detected PN1 detection signal and the PN2 detection signal input from the PN2 detection means 62 It is.

  FIG. 7 shows the descrambling device in which the descrambling means 51 descrambles the input received signal and outputs it as a descrambling signal. Further, the first signal pattern is included in the received signal. PN1 detection means 62 that outputs a PN1 detection signal when the second signal pattern is detected, PN2 detection means 63 that outputs a PN2 detection signal when the second signal pattern is detected in the reception signal, and the reception signal When “0” continuous is detected for a certain period, “0” continuous detection means 42 that outputs a “0” continuous detection signal, and “0” continuous detection signal input from the “0” continuous detection means 42 Depending on the state of the PN1 detection signal input from the PN1 detection means 62 and the state of the PN2 detection signal input from the PN2 detection means 63, either the reception signal or the descrambling signal is output as a transmission signal. It is the schematic diagram shown about the structure of the descrambling apparatus provided with the transmission signal selection means 61 to perform.

  FIG. 8 is a state transition diagram showing an example of the state transition of the transmission signal selected by the transmission signal selection means 61.

  In FIG. 8, when the second signal pattern is transmitted on the line, the signal processing of all the scramble devices or descrambling devices arranged on the line is stopped. Further, when the first signal pattern is transmitted on the line, signal processing of all scramble devices or descrambling devices arranged on the line is started. The first signal pattern and the second signal pattern itself are transmitted transparently, and the signal pattern does not change due to signal processing.

  FIG. 9 is a schematic diagram showing the configuration of a digital signal pattern generation device that implements the fault determination system of the present application. PN1 generating means 91 for outputting a first signal pattern, PN2 generating means 92 for outputting a second signal pattern, a transfer selection signal, and a PN1 detection signal or PN2 detection signal input from the descrambling device Transfer signal selection means for outputting as a transmission signal either the first signal pattern input from the PN1 generation means 91, the second signal pattern input from the PN2 generation means 92, or the reception signal according to the state 93 is a digital signal pattern generator.

  By arranging this digital signal pattern generator on the line, it is possible to transmit a signal for stopping or starting signal processing of the scrambler and the scrambler arranged on the line to the line. Become.

  FIG. 10 shows a scramble device, a descramble device, and a digital signal according to an embodiment in which signal processing of all scramble devices in both directions on the line and the descramble device is stopped or started in the fault determination system of the present application. It is the schematic diagram shown about arrangement | positioning of a pattern generator. The unidirectional digital signal pattern generator 102 transmits either the first signal pattern or the second signal pattern in accordance with the transfer selection signal. The scrambler 103 detects the signal pattern and stops or starts signal processing. The signal pattern itself is not subjected to signal processing by the scrambler 103, and is then received by the scrambler 104 arranged on the line. Similarly, the descrambling device 105 facing the scramble devices 104 and 104 and the descrambling device 106 facing the 103 stop or start signal processing according to the signal pattern after detecting the signal pattern. The PN1 detection signal of the descrambling device 106 arranged closest to the data receiving terminal 107 on the line and the PN2 detection signal of the scrambler device 106 are input to the digital signal pattern generation device 109 arranged in the reverse direction of the line. Then, depending on the state of the PN1 detection signal and the PN2 signal, the signal pattern of either the first signal pattern or the second signal pattern is transmitted. Similarly, the scrambler 110, the scrambler 111, The signal processing of the descrambling device 112 facing the 111 and the descrambling device 113 facing the 110 is stopped or restarted.

  In FIG. 10, the transfer selection signal is the most likely example when the user who manages the data transmission terminal 101 recognizes the necessity of the line test and is input by the user by an artificial means. It is considered to be very useful when entrusting each network operator with fault recovery.

The polynomials used in the scrambler and descrambler need to be different between sets in one direction. For example, when the set of scramblers 103 and 106 uses 1 + X ⁻² + X ⁻⁷ + X ⁻⁸ , the set of scramblers 104 and 105 uses 1 + X ⁻³ + X ⁻⁷ + X ⁻⁸ .

  With international and long-distance digital lines, it is difficult to obtain information on the connected carrier, and this application is extremely useful for users and telecommunications carriers.

  The telecommunications carrier can make the present application a substitute system for the conventional opening test system.

  In other words, a scramble signal is transmitted between the scramble device and the descramble device of the present application, and this is used by the communication carrier during the opening test in that the occurrence probability of “0” ”1” is almost equal. It can be a substitute for a pseudo-random pattern.

  In the interconnection, it is an extremely useful means to use the present application as a substitute system of the conventional opening test system when the opening schedule of the interconnection destination company is unknown and it is necessary to wait for a long time.

  This application allows digital line users to check faults in each operator's responsibility section without requiring out-of-band information, and even a telecommunications carrier can be connected It is applicable to failure section determination including In particular, in international and long-distance digital lines, interconnection has become the mainstream and is highly available. In recent years, the operation functions of users and telecommunications carriers are drastically improved, and practical application is strongly expected.

It is explanatory drawing which showed the failure area determination method of the failure area determination system of this application. It is the schematic shown about the structural example of the scrambler in the fault area determination system of this application. It is the schematic shown about the structural example of the descrambler in the fault area determination system of this application. It is the schematic shown about the structure of the scramble apparatus of this application. It is the schematic shown about the structure of the descrambling apparatus of this application. It is the schematic shown about the structure of the scramble apparatus of this application. It is the schematic shown about the structure of the descrambling apparatus of this application. It is the schematic which showed about the state transition of the transmission signal in the scramble apparatus of this proposal, and the transmission signal selection means of a descrambling apparatus. It is the schematic shown about the structure of the digital signal pattern generator of this application. It is the schematic which showed about the implementation method of the scramble apparatus of this application, a descrambling apparatus, and a digital signal pattern generator. (Example 1)

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Data transmission terminal 12 Scrambler 13 Descrambler 14 Data reception terminal 21 Exclusive OR operator 22 Shift register 41 Scramble means 42 "0" continuous detection means 43 Transmission signal selection means 51 Descramble means 52 Input "1" continuous detection Means 53 Output “1” continuous detection means 61 Transmission signal selection means 62 PN1 detection means 63 PN2 detection means 91 PN1 generation means 92 PN2 generation means 93 Transfer signal selection means 101 Data transmission terminal 102 Digital signal pattern generation apparatus 103 Scramble apparatus 104 Scramble Device 105 Descramble device 106 Descramble device 107 Data receiving terminal 108 Digital signal pattern generator 109 Scramble device 110 Scramble device 111 Descramble device 112 Descramble Location

Claims (9)

A fault zone determination system,
Place a scrambler between the data sending terminal and the data receiving terminal that has a polynomial that outputs other than "1" continuous regardless of the contents of the shift register when "1" is continuously input.
Also, a descrambler having the same polynomial as the scrambler is arranged between the scrambler and the data receiving terminal,
If the input signal of the descrambler is “1” continuous, it is determined that there is a fault section between the scrambler and the descrambler,
A fault section determination system, wherein if a descrambler output signal is "1" continuous, it is determined that a fault section exists between the scrambler and the data transmission terminal. A scramble device,
"0" continuous detection means for outputting a "0" continuous detection signal when "0" continuous is detected for a certain period in the input received signal;
Scramble means for scrambled the received signal with a polynomial that scrambles the "1" continuity to other than "1" continuity without depending on the state of the shift register, and outputs as a scramble signal;
A scramble comprising: a transmission signal selection means for outputting either the reception signal or the scramble signal as a transmission signal according to the state of the detection signal input from the “0” continuous detection means apparatus. A descrambling device,
An input “1” continuous detection means for outputting an input “1” continuous detection signal when “1” continuous is detected for a certain period in the input received signal;
Descrambling means for descrambling the received signal by a polynomial that scrambles the continuation of "1" to a non- "1" continuity without depending on the state of the shift register, and outputs as a transmission signal;
It comprises an output "1" continuous detection means that outputs an output "1" continuous detection signal when "1" continuous is detected for a certain period in the transmission signal input from the descrambling means Descramble device. The scramble device according to claim 2,
PN1 detection means for outputting a PN1 detection signal when a first signal pattern is detected in the received signal;
PN2 detection means for outputting a PN2 detection signal when a second signal pattern is detected in the received signal;
The transmission signal selection means responds to the state of the "0" continuous detection signal input from the "0" continuous detection means, the PN1 detection signal input from the PN1 detection means, and the PN2 detection signal input from the PN2 detection means And a scrambler that outputs either a received signal or a scrambled signal as a transmission signal. The descrambling device according to claim 3,
The descrambling means descrambles the input received signal and outputs it as a descrambling signal.
PN1 detection means for outputting a PN1 detection signal when a first signal pattern is detected in the received signal;
PN2 detection means for outputting a PN2 detection signal when a second signal pattern is detected in the received signal;
“0” continuous detection means for outputting a “0” continuous detection signal when “0” continuous is detected for a certain period in the received signal;
The “0” continuous detection signal input from the “0” continuous detection means, the PN1 detection signal input from the PN1 detection means, and the received signal according to the state of the PN2 detection signal input from the PN2 detection means A descrambling apparatus comprising: a transmission signal selection unit that outputs any one of the descrambling signals as a transmission signal. PN1 generating means for outputting a first signal pattern;
PN2 generating means for outputting a second signal pattern;
In accordance with the state of the transfer selection signal, the PN1 detection signal of the descrambling device of claim 5, and the PN2 detection signal of the descrambling device of claim 5, the received reception signal and the PN1 generation means input from the PN1 generation means 1. A digital signal pattern generation apparatus comprising: a signal pattern of 1 and a transfer signal selection unit that outputs one of the second signal patterns input from the PN2 generation unit as a transmission signal.   7. A data transmission device comprising the scramble device, descrambling device, or digital signal pattern generation device according to claim 2 as failure section determination means.   The failure section determination system according to claim 1, wherein the scrambler according to claim 2 or 4 is arranged instead of the scrambler, and the descrambler according to claim 3 or 5 is arranged instead of the descrambler. Fault section determination system to do.   The failure section determination system according to claim 1, wherein the scrambler according to claim 4 is arranged instead of the scrambler, and the descrambler according to claim 5 is arranged instead of the descrambler, and the data transmission terminal and the data A failure section determination system, wherein the signal pattern generation device according to claim 6 is further arranged between receiving terminals.

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