JPH11252211A - Waveform record analysis output device for digital line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce time for failure examination and to search an accurate failure cause by optionally reproducing and outputting an electric signal waveform recorded by a signal input recording part, analyzing the recorded electric signal waveform with software and displaying the electric signal waveform and analysis processing results. SOLUTION: A voltage waveform is inputted through a signal input recording part 1, undergoes A/D conversion and is transferred to a mass record medium 2a and voltage waveform data are recorded in a subscriber cable section (U point) of a line terminating device 20 or a bus wiring section (T point). An analysis processing part 4 compares the transferred data with the difference between a reference waveform based on an ITU-T recommendation, and a layer 1 analysis is performed. Also, the part 4 converts it into a digital signal, a framing bit is retrieved, a bit string is divided in a frame unit and an INFO trace that traces an INFO signal time sequentially, layers 2 and 3 and protocol analysis are performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform recording / analysis output device for a digital line, and more particularly, to a subscriber line section (U point) of a line terminal connected to a digital line, for example, a U point interface of an ISDN subscriber line. ) Or a high-speed electric signal waveform (line voltage waveform, hereinafter simply referred to as “voltage waveform”) for a long time in the bus wiring section (point T), and the recorded electric signal waveform can be analyzed by software or The present invention relates to a large-capacity waveform recording / analyzing / outputting device for a digital line, which can display and output a recorded electric signal waveform and an analysis processing result.

[0002]

2. Description of the Related Art As shown in FIG. 9, in an ISDN subscriber line, an exchange 30 and a line terminating device 20 are connected via a subscriber cable (point U), and a communication terminal 10 used by a user is connected to a bus terminal thereof. Connected to the wiring side (point T). The communication terminal 10 communicates when a layer 1 that defines electrical and physical conditions is abnormal (failure occurs) in a subscriber cable section (point U) or a bus wiring section (point T). Can not do. In addition, even if the layer 1 function is normal and the communication protocol sequence (layers 2 and 3) is deficient, communication is hindered.

When a reproducible failure occurs, the subscriber cable section (U point) of the line terminating device 20 connected to the U point interface of the operating ISDN subscriber line using various general-purpose measuring instruments. Alternatively, the bus wiring section (T
Point) and search for the cause of the failure. One method of fault investigation is to monitor high-speed voltage waveforms using a general-purpose measuring instrument (electric signal analysis system) such as an oscilloscope.
ITU-T recommendations (I.430, I.431 and G.96)
Compare the difference (pulse mask, etc.) between the reference electric signal waveform based on 1) and the recorded electric signal waveform, confirm the presence or absence of external electric noise, and determine whether the cause of the failure is electrical or physical conditions (layer 1). There is a method of determining whether the cause is caused. In this method, only analysis at the electric signal waveform level is possible, and the communication protocol sequence (layer 2
And 3) it is impossible to perform the translation and long-term monitoring.

As another method, a high-speed voltage waveform is monitored by using a general-purpose measuring instrument (translation system) such as a protocol analyzer, and a high-speed voltage waveform is monitored between the exchange 30 and the line termination device 20 or between the line termination device 20 and the communication terminal 10. There is a method of translating the digital signal transmitted / received by the above and determining whether or not the communication protocol sequence (layers 2 and 3) is incomplete. This method allows translation and long-term monitoring of the communication protocol sequence (layers 2 and 3), but does not allow analysis at the voltage waveform level.
In FIG. 9, a general-purpose measuring instrument (electric signal analysis system) such as an oscilloscope is used to monitor a bus wiring section (point T).
In addition, it is described that a general-purpose measuring instrument (translation system) such as a protocol analyzer is used for monitoring a subscriber cable section (point U).
A general-purpose measuring instrument for an electric signal analysis system and a translation system is connected to one of the points, and high-speed monitoring of a voltage waveform and translation of a digital signal are performed in parallel.

[0005]

As described above, the ISD
When analyzing the lower layer protocol (layers 1, 2, and 3) in the failure investigation of the N subscriber line, the cause of the failure must be searched by combining the electric signal analysis system and the translation system measuring instrument. However, in this method, since the measuring instruments of different systems are used, there is no compatibility between the two data, and it is necessary to manually associate the layer 1 with the layers 2 and 3, which requires a lot of time. There's a problem. Also, if the frequency of failure reproduction is low and the cause of the failure is due to the voltage waveform level, the phenomenon (failure, failure)
There is also a problem that the cause of the failure cannot be determined because it is not possible to capture (the monitoring cannot be performed for a long time). Furthermore,
Since the general-purpose measuring instrument does not have a signal output function for arbitrarily reproducing and outputting recorded data and cannot reproduce a failure in an indoor laboratory, there is also a problem that a failure cause cannot be confirmed or a terminal cannot be debugged.

[0006] In other words, in order to investigate the failure of an ISDN subscriber line, different systems of an electric signal analysis system using a general-purpose measuring instrument such as an oscilloscope and a translation system using a general-purpose measuring instrument such as a protocol analyzer are used. A measuring instrument must be used. Therefore, there are the following problems. (1) A great deal of time is required for fault investigation (especially Layer 1 and Layer 2
And the time required for association with 3). (2) If the cause of the failure is due to the voltage waveform level, it is necessary to investigate under the actual usage environment. Unable to monitor (cannot be monitored for a long time), and the failure reproduction probability is low. Therefore, the failure cause can be concluded only by estimation. (3) In addition, since a general-purpose measuring instrument does not have a signal output function, it is impossible to confirm the cause of a failure or to perform terminal debugging in an indoor laboratory.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital line fault investigation measuring instrument which solves the above-mentioned problems in the prior art. More specifically,
The signal input recording unit of the electric signal analysis system unit can be monitored for a long time, and the electric signal analysis system unit has a signal input recording, analysis processing (layer 2 and 3 protocol analysis function), and a translation unit having a display processing unit. An object of the present invention is to realize a more efficient search for a failure or a failure in a digital line by unifying a man-machine interface unit (including a large-capacity recording medium) with a system device. It is another object of the present invention to add a INFO trace and a layer 1 analysis function to an analysis processing unit, thereby making it possible to search for a fault or a fault in a digital line by going back to a voltage waveform. . Another object of the present invention is to make it possible to confirm a cause of a failure in an indoor laboratory and to perform terminal debugging by adding a signal output unit.

[0008]

In order to achieve the above object, in a waveform recording / analysis output apparatus according to the present invention, as shown in FIG. 1, for example, a line connected to a U point interface of an ISDN subscriber line. In a subscriber cable section (point U) or a bus wiring section (point T) of the termination device 20, an electric signal analysis system measuring instrument such as an oscilloscope capable of analyzing only at a voltage waveform level is used as a fault investigation measuring instrument. , Communication protocol sequence (Layers 2 and 3)
Unifying the man-machine interface unit (including a large-capacity recording medium) 2 of a translation measuring instrument such as a protocol analyzer capable of only translating a program, expanding the analysis processing unit 4, and adding a signal output unit 3 Thus, the apparatus is characterized by being integrated.

Further, the waveform recording analysis output apparatus according to the present invention comprises a signal input recording section 1 for recording a voltage waveform for a long time, a signal output section 3 for arbitrarily reproducing and outputting the recorded voltage waveform, Analysis processing unit (layer 1 analysis function, INFO tracing function, layer 2 and 3 protocol analysis function) 4 to be analyzed by software, and voltage waveform recorded for a long time by the signal input recording unit 1 and analyzed by the analysis processing unit 4 A display processing unit 5 for displaying an analysis processing result is provided.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a configuration diagram of an ISDN subscriber line waveform recording / analysis output device (hereinafter, simply referred to as “waveform recording analysis / output device”) according to an embodiment of the present invention. The waveform recording / analysis output device according to the present embodiment has a high speed in the subscriber cable section (U point) or the bus wiring section (T point) of the line termination device 20 connected to the U point interface of the ISDN subscriber line. A signal input / recording unit 1 for inputting an electric signal (voltage) waveform and recording the signal for a long time; a signal output unit 3 for arbitrarily reproducing and outputting the recorded electric signal waveform; An analysis processing unit 4 for analyzing by software;
Recording is performed for a long time by the man-machine interface unit 2 (for example, adopting a 32-bit operating system) having a built-in large-capacity recording medium 2a having a function of controlling a display processing unit 5 described later, and the signal input recording unit 1. A display processing unit 5 having a function of displaying an electric signal waveform and an analysis processing result analyzed by the analysis processing unit 4 is provided.

Here, the hardware comprises a signal input recording section 1, a signal output section 3, a display processing section 5, and a hardware section of a man-machine interface section 2, and the software includes an analysis processing section 4 and a It is composed of a software section of the man-machine interface section 2. The outline of the operation of the above device is as follows. In the following description, the waveform recording / analysis output device according to the present embodiment is used as a bus wiring section (point T) of the line terminating device 20 connected to the U point interface of the ISDN subscriber line.
To analyze the data on the R line and the T line. First, the subscriber cable section (point U) or the bus wiring section (T) of the line termination device 20 connected to the U point interface of the ISDN subscriber line.
2), the voltage waveform is input to the apparatus via the signal input recording unit 1, A / D converted, and transferred to the large-capacity recording medium 2a in the man-machine interface unit 2.
Record voltage waveform data over a long period of time.

Next, the recorded data is transferred to the analysis processing unit 4 via the man-machine interface unit 2. The transferred data is compared with the difference (pulse mask, etc.) from the reference voltage waveform based on the ITU-T recommendations (I.430, I.431 and G.961) by the analysis processing unit 4 and the layer 1 analysis is performed. Done. The transferred data is converted into a digital signal (bit 1 or 0) by the analysis processing unit 4, and the converted bit data is converted into framing bits (frame start bits;
“F bit” is searched, a bit string is divided into frame units based on this, and INFO tracing for tracing INFO signals in time series and layer 2 and 3 protocol analysis are performed.

Hereinafter, details of the operation of the analysis processing unit 4 will be described in order. First, in the analysis processing unit 4,
The procedure for converting the transferred data into a digital signal (bit 1 or 0) will be described with reference to FIG. For the transferred data 101, a ground potential (0)
The allowable range of the upper limit value 102 and the lower limit value 103 in the positive polarity area (positive polarity determination area) is set on the basis of, and bit setting (for example, of the ISDN basic interface) is performed depending on whether or not the data 101 is within the range. In the case of the bus wiring section (point T), the range is “0” and the range is “1”. Similarly, the upper limit value 104 in the negative polarity area,
The allowable range of the lower limit value 105 (negative polarity determination area) and bit setting are performed.

In order to correct the jitter on the time axis of the transferred data 101 and synchronize the plurality of channels, it is necessary to unify the pulse identification start point 201. Next, the details will be described with reference to FIG. A time from the ground potential (0) of the first pulse to the positive or negative potential direction in the positive or negative potential direction (including the zero-crossing point) as a reference point 202, and the time from the digital signal conversion start point 203 to the reference point 202. Reference point 2 of 204
02, the time obtained by adding the conversion start point 203 of the digital signal to the remainder of the quotient (integer) of an arbitrary time 205 for performing pulse identification is set as a pulse identification start point 201, a sampling time 206 is arbitrarily set, and the data 101 is converted to a pulse. Sampling is performed in units of a sampling time 206 from the identification start point 201, and the threshold levels 102 and 103 are sampled.
The conversion of the digital signal in the positive polarity area is performed depending on whether or not the data 101 is within the range of (1). Similarly, conversion of the digital signal in the negative polarity area is performed according to the threshold levels 104 and 105.

In the actual processing, as shown in FIG. 4, data to be numerically converted is selected from the input voltage waveforms as an analysis target (step 301). Next, according to the purpose of the analysis, for example, as shown in FIG.
If O-trace is to be performed, the target line type, location (4 lines or 2 lines, T point or U point, etc.), data range, etc. (time, data on T line or data on R line, etc.) The analysis conditions are set (step 302). Hereinafter, according to this condition, an F bit search (step 3) will be described later.
03), frame division (step 304), INFO trace (step 305), and the like. Obtained IN
The FO data is displayed as an analysis result and stored. Using this, it is also possible to perform layer 2 and 3 protocol analysis.

Hereinafter, the above-mentioned F in step 303 of FIG.
The INFO trace processing from the bit search to the step 305 will be described in more detail. First, a numerical conversion file as shown in FIG. 5A is created from the positive and negative conversion data numerically converted by the procedure shown in FIG. When this is converted into a waveform image, it becomes as shown in FIG. From this, as shown in FIG. 5B, there is a voltage waveform following the + side (,), then a voltage waveform following the-side (,), and then a voltage waveform on the + side ( ) Search the state. The state following the above, ,, or
,, Are determined to be F bits. Then, an F-bit conversion file as shown in FIG. 5C is created in correspondence with the numerical value conversion file shown in FIG. 5A. The above is the procedure of the F bit search.

Next, frame division will be described. As shown in FIG. 6, the data on the T line or the data on the R line of interest is INFO0 to INFO4 as shown in FIG.
There are types up to. It should be noted here that only INFO0, INFO1 and INFO3 can exist on the T line, and INFO0, INFO2 and INFO3 on the R line.
Only FO4 can be present. The bit configuration of each signal is as shown in the figure.
Only O4 has a frame structure starting from the F bit. Therefore, for INFO2 to INFO4, F
4 bits of positive and negative integrated data starting from the bit
Frame division (considering frame fractions) can be performed at 8-bit intervals (one frame is composed of 48 bits).

FIG. 7 shows an operation flow chart of frame division. First, INFO0 and INFO1 patterns are defined (step 401). In the case of data on the R line,
The INFO1 pattern is invalid. Next, it is determined whether or not the F bit exists in the data (bit string) (step 402). If there is no F bit, the process proceeds to step 408, and it is determined whether the starting point can be determined. This starting point is determined by INFO0 or INF0.
Starting from the point that matches the O1 pattern, INFO0
Shall take precedence. If the starting point can be determined in step 408, the process proceeds to step 411, where 8 × n
(N = 1, 2, 3,...) Bits are divided as a frame (c) described later. Thereafter, for the remaining bit strings,
Step 407 and subsequent steps are repeated.

If it is determined in step 408 that the starting point cannot be determined, the flow advances to step 409 to divide the bit string into a frame (d) described later for each group.
On the other hand, if there are F bits in step 402, the process proceeds to step 403, where the data is divided into the first half and the second half (including the F bits) using the first F bits as a boundary. And
In step 404, it is determined whether or not the above-divided portion includes F bits. If the F bits are included, the process proceeds to step 405. When each F bit is set as a starting point, the number of subsequent bits is 47 bits. It is determined whether the above is the case or not. If YES, at step 406 48
The bits are divided into (a) frames to be described later. Here, hereafter, step 407 is performed for the remaining bit strings.
Repeat thereafter.

If it is determined in step 405 that the number of subsequent bits is not 47 bits or more, step 41
Proceeding to 2, the bit string starting from the F bit and having a bit number of less than 48 is divided into (a) 'frames to be described later. If it is determined in step 404 that the F bit is not included, the process proceeds to step 407 to determine whether the number of bits is less than 48 bits.
Each group is divided into (b) frames described later (step 410). After the frame division, as shown in FIG. 8, each frame unit of (a), (b), (c), (d), (a) '
Perform NFO classification.

In FIG. 8, "unknown" means IN
Those that do not correspond to any of FO0 to INFO4 are shown, and INFO2 'or INFO4'
Indicates that the possibility of INFO2 or INFO4 is high, respectively. As described above, according to the waveform recording / analysis output device according to the present embodiment, the recorded electric signal waveform data and the analysis data of the layer 1 analysis, the INFO trace, the layer 2 and the 3 protocol analysis are transmitted to the man-machine interface. By displaying individually or in conjunction with the display processing unit 5 via the unit 2, it is possible to systematically associate the layer 1 (including the influence of external electrical noise) with the layers 2 and 3, and Even if the reproduction probability is low and the cause of the failure is due to the electric signal level, the cause of the failure can be determined by monitoring the ISDN subscriber line for a long time.

Further, the recorded data is transferred to the signal output unit 4 via the man-machine interface unit 2 and the D / A
By converting and outputting as an electric signal, it is possible to confirm the cause of the failure and debug the terminal in an indoor laboratory. As described above, one embodiment of the present invention has been described.
This is merely an example, and it goes without saying that the present invention is not limited to this. For example, the line (signal) used in the above embodiment is not limited to the ISDN subscriber line, and it goes without saying that this type of device can be realized even with an I interface dedicated line. Also, ISD
It is possible to realize a similar device in another protocol system instead of N.

[0023]

As described above in detail, according to the waveform recording / analyzing / outputting apparatus according to the present invention, when a failure is investigated for a sudden specific failure (unknown cause) of an ISDN subscriber line, Monitors the subscriber cable section (point U) or bus wiring section (point T) of the line terminator connected to the U point interface of the line over a long period of time, and simultaneously analyzes layer 1 and layer 2 and 3 protocols in both sections. Can be realized. As a result, the time required for the failure investigation can be reduced, and a more accurate failure cause search can be performed. Further, according to the waveform recording analysis output device for digital circuit according to the present invention, since it has a signal output unit, it is possible to confirm the cause of failure or to check the terminal in an indoor laboratory based on data collected in an actual use environment. Debugging can be performed. Can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram in which a subscriber cable section (point U) or a bus wiring section (point T) is monitored for a long time by a large-capacity waveform recording / analyzing / outputting device for an ISDN line.

FIG. 2 is a diagram illustrating conversion of a digital signal (bit 1 or 0).

FIG. 3 is a diagram for unifying pulse identification start points.

FIG. 4 is a flowchart showing an outline of an INFO trace which is one of the analysis functions of the large-capacity waveform recording / analyzing / outputting apparatus for an ISDN subscriber line.

FIG. 5 is a diagram illustrating an operation for searching for an F bit.

FIG. 6 is a diagram illustrating types of INFO signals and their configurations.

FIG. 7 is a flowchart showing an operation of frame division.

FIG. 8 is a flowchart illustrating an operation for performing INFO division based on a result of frame division.

FIG. 9: By using a conventional measuring device of a different system,
Subscriber cable section (point U) or bus wiring section (T
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal input recording part 2 Man-machine interface part 2a Large-capacity recording medium 3 Signal output part 4 Analysis processing part 5 Display processing part

Claims (3)

[Claims] 1. A signal input recording unit for recording an electric signal waveform on a digital line, a signal output unit for arbitrarily reproducing and outputting an electric signal waveform recorded by the signal input recording unit, An analysis processing unit for analyzing by software, a display processing unit for displaying an electric signal waveform recorded by the signal input recording unit and an analysis processing result analyzed by the analysis processing unit; and a signal input recording unit, a signal output unit, A digital line waveform recording / analysis output device comprising a man-machine interface unit for controlling an analysis processing unit and a display processing unit. 2. An analysis processing unit comprising: a layer 1 analysis function for comparing a difference between a reference electric signal waveform based on an application protocol and a recorded electric signal waveform; and a digital signal (bit 1 or bit 1) 2. The waveform recording / analyzing / outputting apparatus for digital lines according to claim 1, further comprising an INFO trace for the converted bit string, and an analysis function for performing layer 2 and 3 protocol analysis. 3. The layer 1 analysis function for comparing a difference between a reference electric signal waveform based on ITU-T recommendations (I.430, I.431 and G.961) and a recorded electric signal waveform. Arbitrarily adjusts the threshold level of the recorded electric signal waveform, corrects the jitter on the time axis, converts the signal into a digital signal (bit 1 or 0), and converts the framing bits of the converted bit string. INF which searches and divides the bit string into frame units and traces the INFO signal in time series
2. A digital line waveform recording / analysis output device according to claim 1, further comprising an O trace and an analysis function for performing layer 2 and 3 protocol analysis.