JP2001168951A - Data transmission evaluating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data transmission evaluation method by which missing of many characters, if it occurs, is grasped correctly. SOLUTION: In data transmission, a transmitter terminal generates a series of data with a serial number added to them every one character string pattern, with respect to data configured by the repetition of a prescribed character string pattern. A transmitter side MODEM digital/analog converts data received from the transmitter terminal and transmits the resulting data. A receiver side modem receives a series of data transmitted by the transmitter side modem, applies analog/digital conversion to the received data and the receiver side terminal detects data received from the receiver side modem. Then the received and detected data are compared with a series of the transmitted data and whether or not the both the coincident is checked to discriminate whether or not the data are correctly transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to data transmission.

[0002]

2. Description of the Related Art In testing a modem or the like, "TH
E QUICK BROWN FOX JUMPS OVE
The repetition of the data pattern "R THE LAZY DOG" a plurality of times is widely used as communication data. The reason for using this data pattern is that all alphabets from A to Z must be at least 1 in this data pattern.
Because the times are included, by checking whether or not this data pattern is normally detected, it is possible to judge whether or not there is any alphabet that cannot be normally detected, and to evaluate the accuracy of data transmission. .

[0003]

However, if a large number of character strings are lost in data transmission, the missing characters may not be correctly grasped. For example, when the number of missing characters is expressed by the following equation (1): number of missing characters = number of characters constituting data pattern × n (1) (where n is a natural number), information indicating occurrence of missing characters. Cannot be obtained, which may cause an illusion that communication has been performed normally. Further, when the number of missing characters is in the relationship of Expression (2): Number of missing characters> Number of characters constituting data pattern (2), the number of actually missing characters cannot be accurately grasped.

[0004] It is an object of the present invention to provide a data transmission evaluation method for correctly grasping when a large number of characters are missing.

[0005]

The data transmission evaluation method according to the present invention uses a new data pattern. That is, a series of data obtained by adding a serial number to each character string pattern with respect to data formed by repeating a certain character string pattern is transmitted from the transmission device. For example, the serial number is added to the beginning and end of each character string pattern. The receiving device receives the series of data transmitted by the transmitting device.
Then, the received data is compared with a series of transmitted data, and it is determined whether or not the data is correctly transmitted by checking whether or not the two match.

For example, in a modem evaluation, the transmitting device includes a transmitting terminal and a transmitting modem, and transmits the series of data from the transmitting terminal, and the transmitting modem receives the data from the transmitting terminal. The converted data is DA-converted and transmitted. The receiving device includes a receiving terminal and a receiving modem. The receiving modem receives the series of data transmitted by the transmitting modem and performs A-D
After the conversion, the receiving terminal detects the data received from the receiving modem. Then, by comparing the received and detected data with the transmitted series of data and checking whether or not the two are the same, it is determined whether or not the data transmission has been correctly performed.

[0007] For example, in this data transmission evaluation method, the transmitting modem DA converts the data received from the transmitting terminal and sends it to an external circuit.
The series of data is received via an external circuit. For example, the external circuit is a public line simulator. For example, the public line simulator is an inter-central office line simulator. Also, for example, the above-mentioned public line simulator is a subscriber line simulator and an inter-phone-station line simulator. Further, for example, the external circuit is a public line.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference symbols indicate the same or equivalent ones. In the present invention,
To evaluate the data transmission, a new data pattern, described later, is generated. Here, the case of modem evaluation will be described. FIG. 1 shows a configuration of a system for a modem test according to an embodiment of the present invention. The transmitting terminal 11 is connected to a public telephone line 3B via a transmitting modem 12. The character string data transmitted by the transmitting terminal 11 is subjected to DA conversion by the transmitting modem 12, and an analog signal is transmitted to the public telephone line 3B. Similarly, the receiving terminal 21 is connected to the public telephone line 3B via the receiving modem 22. A-
The D-converted signal is received by the receiving terminal 21 as character string data.

For a modem test, a protocol analyzer 41 is attached between the receiving modem 22 and the receiving terminal 21, and a public telephone line simulator 3A is arranged via switches 33 and 34. The public telephone line simulator 3A includes a subscriber line simulator 31 and an inter-phone office line simulator 32, and simulates the operation of a public telephone line. The switch 33 selects the public telephone line 3B and the public telephone line simulator 3A. The switch 34 selects whether to pass through the subscriber line simulator 31 or not. In addition,
Although not shown, transmission data from the transmitting modem 12 can be directly received by the receiving modem.

At the time of the test, the character string data transmitted from the transmitting terminal 11 is subjected to DA conversion by the transmitting modem 12. Next, the analog signal is supplied to the switches 33, 3
4, the public telephone line simulator 3A (the inter-telephone office line simulator 32 or the subscriber line simulator 3A).
A and D are received by the receiving modem 22 via the line simulator 32 between the central office and the central office, the public telephone line 3B, or directly without passing through the public telephone line simulator 3A and the public telephone line 3B. The conversion is performed. After that, the character string data detected by the receiving terminal 21 is compared, and it is determined whether or not the data transmission is correctly performed by checking whether or not the two match.

Here, when a function test and a performance test of a modem are performed, serial numbers are assigned to actual data consisting of a repetition of a certain character string pattern for each character string pattern. Use the one added. The character string pattern is, for example, “THE QUICK BROWN FOX JU
The data pattern is “MPS OVER THE LAZY DOG”. The protocol analyzer 4 records data sent from the modem to the terminal during the test. After the test, it is determined whether or not the data transmission has been correctly performed by checking whether or not the data pattern in the data recorded in the protocol analyzer 41 has a missing or garbled character.

As shown in FIG. 2, as the actual test data, "00" is added at the beginning and end of the character string pattern.
A three-digit number (serial number) from 0 "to" 999 "is used.When a repeated pattern of 1000 times or more is used as test data," 0 "is used again.
"00" or a four-digit number from "0000" to "9999"
Choose one method.

FIG. 3 shows an example in which a test is performed using the test data, and the character string data detected by the receiving terminal 21 after the test is displayed on the display of the protocol analyzer 41. At point (a), it is shown that the portion of “UICK BR” in the data pattern is missing. At point (b), it is shown that the portion of "OVER THE LA" in the data pattern is missing. At point (c), at first glance, it seems that no missing characters have occurred.
However, the number at the end of the data pattern is 008, and the number at the beginning of the next line is 011.
This indicates that two data patterns up to 0 are missing. At point (d), the number at the beginning of the line is 015
On the other hand, since the number at the end is 018, it is indicated that the number of characters “the number of characters constituting the data pattern × 3” is missing. At the point (e), the number at the beginning of the line is 022, while the number at the end is 027. Therefore, “the number of characters constituting the data pattern × 5 +
It is shown that the number of characters "3" is missing.

[0014]

According to the present invention, the number of missing characters can be accurately detected in data transmission. Also, when analyzing the cause of a missing character after finding the missing character, the added serial number serves as a marker to indicate which part in the detected data, which is necessary for efficient analysis. To help you.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a modem evaluation system.

FIG. 2 is a diagram of an example of test data to be used.

FIG. 3 shows one of character string data detected in the test.
Example diagram

[Explanation of symbols]

11 transmitting terminal, 12 transmitting modem, 21
Receiving terminal, 22 receiving modem, 3A public line simulator, 31 subscriber line simulator, 32 telephone line simulator, 3B public line, 41 protocol analyzer.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K035 AA03 BB04 EE02 FF03 GG02 5K042 AA03 BA06 CA11 CA12 CA18 DA11 EA13 FA03 GA02 GA06 HA02 JA08 LA09 LA11

Claims (8)

[Claims] 1. A series of data obtained by adding a serial number to each character string pattern with respect to data formed by repeating a certain character string pattern is transmitted from a transmitting device. Receiving the series of data transmitted by the transmitting device, comparing the received data with the transmitted series of data,
A data transmission evaluation method for determining whether or not data transmission is correctly performed by checking whether or not the two match. 2. The data transmission evaluation method according to claim 1, wherein said serial number is added to the beginning and end of each character string pattern. 3. The transmitting apparatus includes a transmitting terminal and a transmitting modem, and transmits the series of data from the transmitting terminal. The transmitting modem transmits the data received from the transmitting terminal to a D terminal. The receiving apparatus comprises a receiving terminal and a receiving modem, and the receiving modem receives the series of data transmitted by the transmitting modem and performs A / D conversion. The receiving terminal detects the data received from the receiving modem, compares the detected data with a series of transmitted data, and checks whether the two match. The data transmission evaluation method according to claim 1, wherein it is determined whether or not the data transmission has been correctly performed. 4. A transmitting modem, which DA converts the data received from the transmitting terminal and sends it to an external circuit, and the receiving modem receives the series of data via the external circuit. The data transmission evaluation method described in 1 or 2. 5. The data transmission evaluation method according to claim 4, wherein said external circuit is a public line simulator. 6. The data transmission evaluation method according to claim 5, wherein said public line simulator is an inter-telephone office line simulator. 7. The data transmission evaluation method according to claim 5, wherein said public line simulator is a subscriber line simulator and a telephone line inter-station simulator. 8. The data transmission evaluation method according to claim 4, wherein said external circuit is a public line.