JPH0738697A - Communication protocol measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] Visually capture the communication status using the communication status diagram,
Easily analyze and evaluate the G3 communication protocol. When a communication protocol between facsimiles 1 and 4 is measured, a signal from communication line 2 is input from network control unit 6 to modem 7 and detected. The determination unit 14 determines whether or not the detected signal is a protocol signal, and the signal information format-converted by the format conversion unit 15 is transferred to the display unit 10 and the recording unit 11 and output. The display unit 10 displays information such as the content of the communication protocol signal, the duration of the protocol signal, the time interval between the protocol signals, and the content of the transmission information signal as numerical values. The communication state diagram creation unit 12 creates a communication state diagram based on the information displayed on the display unit 10, and can easily grasp the communication state and the deterioration state of the line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication protocol measuring device, and more specifically, it enables a communication status to be visually grasped by a communication state diagram and facilitates analysis and evaluation of a G3 communication protocol. The present invention relates to a communication protocol measuring device.

[0002]

2. Description of the Related Art G3 facsimile control signal sequence,
That is, the communication protocol is defined as a binary coded signal system based on Recommendation T.30 of the International Telegraph and Telephone Consultative Committee (CCITT), and the communication control of the G3 facsimile is executed by a sequence based on the regulation of the recommendation. That is, the facsimile signal is designed so that the communication control is executed while switching the modem mode according to the protocol signal. The training check signal and the image information signal are transmitted in the high speed mode, and the other protocols are transmitted. It is sent out at V.21. Also,
The calling and non-call terminal identification signals are transmitted in the tonal signal mode. A communication protocol measuring instrument is used to test the communication protocol of this type of G3 facsimile.

In this communication protocol measuring device, a signal is input from a communication line between a plurality of facsimiles for transmission and reception, the signal is processed, and information related to the signal is displayed and recorded as a measurement result on a display section or a recording section. It was like this. By looking at the output measurement result, the user can analyze and confirm whether or not the facsimile is transmitting / receiving a normal signal sequence or image information with a normal protocol signal. As described above, by using the communication protocol measuring device, the protocol signal defined in CCITT Recommendation T.30 is detected, and the user analyzes the communication protocol based on the measurement result.
Can be evaluated. However, the conventional communication protocol measuring device can display the measurement result in the form of a numerical value or a timing chart, but does not include the function of displaying it in a visually understandable form including the communication situation.

As known documents describing the prior art relating to the present invention, for example, "Communication Protocol Measuring Method" in JP-A-4-240957 and "G3 Protocol Measuring Device" in JP-A-4-269068 are proposed. ing. In the communication protocol measuring method for measuring a communication protocol, the one disclosed in Japanese Patent Laid-Open No. 4-240957 determines whether or not a signal input from a communication line is a protocol signal, and when the signal is not a protocol signal, The information related to the signal is acquired and is output so as to be distinguishable from the information of the protocol signal. Also,
Japanese Patent Laid-Open No. 4-240957 discloses a G3 protocol measuring device for measuring a communication protocol of a G3 facsimile, and a printing method selecting means for selecting and inputting a printing method of data of the measured communication protocol. Data extraction means for extracting and transferring print data by a printing method is provided.

[0005]

[Object] The present invention has been made in view of the above-mentioned circumstances, and the protocol command and image information obtained by the G3 communication protocol measuring device, the rise and the duration of each command, and the time interval between commands are also set. In addition, the object of the present invention is to provide a communication protocol measuring device that automatically creates a communication state diagram that allows the user to grasp the communication state at a glance.

[0006]

In order to achieve the above object, the present invention provides (1)
In a communication protocol measuring device having a detecting means for detecting information such as contents of communication protocol signals, duration between protocol signals, time intervals of protocol signals, contents of transmission information signals, display means for displaying the information as numerical values, A communication state diagram is created based on the information, and a means for easily grasping the communication state and the deterioration state of the line is provided, and (2) the communication state diagram is from the start of communication to the end of communication. The protocol communication time, the information transmission time, and the change in the information transmission rate are displayed together, and further, (3) In (2), the total amount of information to be transmitted as the information transmission rate. In the one-time information transmission when 1 is set to 1, the ratio of the information that can be transmitted is acquired from the protocol information signal and used, and further, (4) above (1)
In (3), the transmission rate of the information is acquired from the protocol information and can be displayed and identified on the communication state diagram by using the line type and line color, or (5) the G3 communication protocol for measuring the G3 communication protocol. A measurement device, which is a communication protocol measurement device having detection means for detecting information such as the content of a G3 communication protocol signal, the duration of a G3 protocol signal, the time interval between G3 protocol signals, and the content of a transmission information signal. A display means for decoding the information and displaying it as image information is further provided, and further, (6) in (5), when the communication of the G3 is in the error correction mode, a high level data ring control frame is formed. And a means for constructing an image information file by extracting only the image information of only the error-free frames from the transmission information, and further (7) before (5) or (6), G
3 Having a decoding means for analyzing image information compression means from the contents of the communication protocol signal and decoding the image information based on this, or (8) contents of the communication protocol signal, duration of the protocol signal, protocol Time interval between signals,
In a G3 communication protocol measuring device having a detecting means for detecting information such as the content of a transmission information signal, a display means for displaying the information as a numerical value and a communication state diagram based on the information are prepared, and a communication status is displayed. It is characterized in that it is provided with means for easily grasping the deterioration status of the line and display means for decoding the transmission information and displaying it as image information.
Hereinafter, description will be given based on examples of the present invention.

FIG. 1 is a block diagram for explaining an embodiment of a communication protocol measuring apparatus according to the present invention. In the figure, 1 is a facsimile, 2 is a communication line, 3 is an exchange, 4 is a facsimile, and 5 is a protocol. A measuring device, 6 is a network control unit, 7 is a modem, 8 is a V.21 command flag monitoring unit, 9 is a tonal signal detection unit, 10 is a display unit, 11 is a recording unit, 12 is a communication state diagram creating unit, and 13 is Control unit, 14 is determination unit, 15
Is a format conversion unit, 16 is a signal duration detection unit, 1
Reference numeral 7 is a comparison control unit, and 18 is a duration setting unit.

The G3 facsimiles 1 and 4 are configured to transmit and receive signals based on the communication protocol of CCITT Recommendation T.30, and these are transmitted via the exchange 3.
They are connected to each other by a communication line 2. In addition, the protocol measuring device 5 uses the communication line 2 between the facsimiles 1 and 4.
Is connected to, and the communication protocol between the facsimile 1 and the facsimile 4 is measured.

That is, the protocol measuring device 5 is connected to the communication line 2 to establish a communication network, and the modem 7 for demodulating signals (modulated signals) transmitted and received between the facsimiles 1 and 4. Then, the control unit 13 that controls the entire protocol measuring device 5 detects the V.21 command and detects the command.
The V21 command flag monitor 8 for switching to the mode and the called terminal identification signal (CE
D) etc., a tonal signal detection section 9 and a display section 10 such as a CRT display for displaying measurement results etc.
And a recording unit 11 such as a hard disk device or a floppy disk device for recording measurement results and the like.

The display unit 10 displays information such as the contents of the communication protocol signal, the duration of the protocol signal, the time interval between the protocol signals, the contents of the transmission information signal, etc. as numerical values. In addition, the communication state diagram creation unit 12 uses the display unit 10
A communication status diagram can be created based on the information displayed on, and the communication status and line deterioration status can be easily understood. Further, the communication state diagram displays the protocol communication time from the start of communication to the end of communication and the information transmission time together with the change in the information transmission degree.

The modem 7 in the protocol measuring device 5 detects various signals transmitted on the communication line 2 according to the communication protocol between the facsimile 1 and the facsimile 4. Further, the control unit 13 determines whether or not the signal detected by the modem 7 is a protocol signal defined by CCITT Recommendation T.30, and at the same time as the determination processing in the determination unit 14, the modem 3 SED (Si
gnal Energy Detect) signal is used to detect the duration of the signal, and a format conversion unit 15 for converting information about the signal detected by the modem 7 into a predetermined format.

The determination unit 14 of the control unit 13 determines whether or not the signal detected by the modem 7 has a standard frame structure and is a protocol signal.
Further, the signal duration detection unit 16 of the control unit 13 uses the SED
The time interval between the rise and fall of the signal is detected as the signal duration.

Further, the format conversion section 1 of the control section 4
5 converts information about the signal detected by the modem 7 into a format. The signal information whose format has been converted is transferred to the display unit 10 and the recording unit 11 and output as a measurement result.

By the way, in the embodiment of the present invention, CCIT
The determination unit 14 detects not only the protocol signals defined by the T recommendation T.30 but also signals such as noises not defined by the T, and the format conversion unit 15 converts the information into a format. Then, display, record, etc. are output.

In this way, the information of the signal such as noise which is not the protocol signal is also format-converted and displayed.
Although the signal is recorded, for example, in a situation where the line noise of the communication line 2 is large, the number of times the signal such as noise is displayed and recorded is larger than that of the protocol signal. In such a case, the control unit 13 can further optionally set a predetermined signal duration in advance, a duration setting unit 18, a signal duration of a signal such as noise stored in the format, and a duration setting unit. A comparison control unit 17 that compares the signal duration set in advance with 18 and displays and records only information of signals such as noise having a signal duration longer than the preset signal duration is provided. Is good
With this configuration, it is possible to display and record, as the measurement result, only signal information such as noise among signals of various noises, the signal duration of which is longer than a certain value.

FIG. 2 shows a communication situation from the start to the end of communication in the ECM (Error Correction Mode) by the CCITT automatic retransmission method. After the communication conditions are set in the P1 section on the transmission side and the reception side, the transmission of image information is started from (a). Here, the image information (a) includes 256 HDLCs (High level).
Data Link Control: High-level data link control).

On the receiving side (Receiver), CRCC (Cycl
ic Redundancy Check Code) detects an error frame in a block, and the number of this error frame is sent to the transmitter (Transmitter) by PPR (Pertial Page Reques
t) Transmitted by command (b). There is an error in frame 1 and frame 3, and this frame is retransmitted in (c). Here, if there are no error frames, the receiving side is M
A CF (Message Confirmation) command (1) is returned to notify the transmitting side that the image information has been received without error, and the communication ends. However, if there is an erroneous frame,
Repeat the previous retransmission control. That is, (d), (e),
(F) and (g) are repeated.

When the transmitting side receives the PPR for the same block four times, it can complete the retransmission by EOR (End Of Retransmission) or CTC (Continue To Correct).
Gives an instruction to the receiving side whether to continue the retransmission. When continuing the retransmission, an instruction to send at the same modem rate or to reduce the transmission speed is also given. Frame 1 is often erroneous, and after receiving PPR four times (h), communication is continued by CTC (i), finally frame 1 is transmitted, and communication is ended.

A communication state diagram is created from this protocol communication information. First, the protocol portion and the image information portion are distinguished, and the protocol time, the image information transmission time, and regarding the image information, the number of error frames of the image information is obtained from the PPR information at the time of retransmission, and these are respectively calculated as PT _i (i = 1-n), I
Let M _j (j = 1 to n-1) and EF _k (k = 1 to n-2).
Here, the number of frames of the entire image to be transmitted is N, and based on the number of error frames for each retransmission, the ratio of the image information that could not be transmitted by each retransmission to the whole is untransmitted rate REF
_The following expression is used as _k (k = 1 to n-1) (Rate of Error Flame). REF _k = EF _k / N (1) Here, a communication state diagram is created using these PT _i , IM _j , and REF _k .

FIG. 3 is a communication state diagram in which the horizontal axis represents time,
The vertical axis represents the untransmitted rate. 2 CFR,
The transmission rate can also be described based on the CTC information. It should be noted that the thick solid line indicates image information transmission and the thin solid line indicates protocol communication, and the transmission speed can also be displayed by making this thick solid line a broken line. Also,
The communication status can be grasped as follows.

In the ECM system, the number of initial transmission frames is N, the number of bytes in one frame is B, the bit error rate in the line is BER, and the ECM in this line is ECM.
Let EF be the number of retransmitted frames at the time of performing. These relationships are EF = N · B · 8 · BER (2) Here, since everything except BER is known,
From the equations (1) and (2), BER is calculated as BER = EF / (N.B.8) = REF / (B.8) (3), and the average line status can be known.

FIG. 4 is a diagram showing another embodiment of the communication protocol measuring device according to the present invention. In the figure, 19 is an image information processing unit, and other parts having the same functions as those in FIG. It is attached. The image information processing unit 19 is a part that executes the functions of the present invention. Here, since the image information obtained from the protocol measuring device is demodulated from the transmission signal, M
The information is compressed by H (Modified Huffman), MR (Modified Read), MMR (Modified Modified Read), and the like. Further, when the G3 communication is performed in the ECM mode, the image information has an HDLC frame structure. The image information processing unit 19 obtains from the protocol signal whether the ECM mode or not and the compression method is MH, MR, or MMR, decodes the image information based on this information, and displays the image on the display unit. The conversion process is performed as seen in.

FIG. 5 is a diagram showing still another embodiment of the communication protocol measuring device according to the present invention.
This is similar to FIGS. 1 and 4. That is, the communication state diagram creation unit 12 for creating the communication state diagram and the image information processing unit 19 are both provided. The function of each processing unit is shown in FIG.
It is similar to that described in FIG.

[0024]

As is apparent from the above description, the present invention has the following effects. (1) Effects corresponding to claims 1 to 3: The communication status can be visually grasped by the communication status diagram, and the communication protocol can be analyzed and evaluated more easily. (2) Effect corresponding to claim 4: By adding the communication speed to the communication state diagram, it becomes possible to study the details of the analysis and evaluation of the communication state. (3) Effects corresponding to claims 5, 6 and configuration 7: Image information obtained by the protocol measuring device can be printed or displayed, and the communication status can be examined in detail through the printed image. is there. (4) Effects corresponding to the configuration 8: It is possible to study more detailed communication status, communication status of communication protocol, and the like from the information of both the communication status diagram and the printed image.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a communication protocol measuring device according to the present invention.

FIG. 2 is a diagram showing a communication situation from the start to the end of communication in ECM (error correction mode) according to the present invention.

FIG. 3 is a diagram showing a communication state diagram in the present invention.

FIG. 4 is a diagram showing another embodiment of the communication protocol measuring device according to the present invention.

FIG. 5 is a diagram showing still another embodiment of the communication protocol measuring device according to the present invention.

[Explanation of symbols]

1 ... Facsimile, 2 ... Communication line, 3 ... Switch, 4 ... Facsimile, 5 ... Protocol measuring device, 6 ... Network control unit,
7 ... Modem, 8 ... V.21 command flag monitor, 9 ...
Tonal signal detection section, 10 ... Display section, 11 ... Recording section, 1
2 ... communication state diagram creation unit, 13 ... control unit, 14 ... determination unit,
15 ... Format conversion section, 16 ... Signal duration detection section, 17 ... Comparison control section, 18 ... Duration setting section.

Claims (6)

[Claims] 1. A communication protocol measuring device having a detecting means for detecting information such as contents of communication protocol signals, duration of protocol signals, time intervals between protocol signals, contents of transmission information signals, etc. A communication protocol measuring device comprising display means for displaying and a means for creating a communication status diagram based on the information and easily grasping the communication status and the deterioration status of the line. 2. The communication status diagram displays together with a protocol communication time from the start of communication to the end of communication, information transmission time, and change in information transmission rate. Communication protocol measuring device. 3. As the information transmission degree, the ratio of information that can be transmitted in one information transmission when the total amount of information to be transmitted is 1 is acquired from the protocol information signal and used. The communication protocol measuring device according to claim 2. 4. The communication protocol measurement according to claim 1, wherein the transmission rate of the information is acquired from the protocol information, and the information can be displayed and identified on the communication state diagram by using the line type and the line color. apparatus. 5. A G3 communication protocol measuring device for measuring a G3 communication protocol, the information including the content of the G3 communication protocol signal, the duration of the G3 protocol signal, the time interval between the G3 protocol signals, the content of the transmission information signal, and the like. A communication protocol measuring apparatus having a detecting means for detecting a communication protocol measuring apparatus, comprising: a display means for decoding transmission information and displaying it as image information. 6. A means for forming an image information file by extracting only image information of only an error-free frame from transmission information converted into a high-level data ring control frame when the G3 communication is in an error correction mode. The communication protocol measuring device according to claim 5, characterized by comprising.