JPS62281546A - Test data transmission system - Google Patents

Abstract

PURPOSE:To improve the efficiency of transmission by checking the content of a command when its own station is called and driving a high-speed reception section to receive long sentence data. CONSTITUTION:A test control section 20 generates test data T0 consisting of a preamble P, a command C, an opposite station address AR, and its own station address AS, scrambles the data and sends the result via a MODEM section 22. A reception side receives a reception signal at all times via a MODEM demodulation section 23, a test data detection section 24 receives a reception signal via a low-speed reception section 27, a command decision section 25 decides the content of the command C when the text is communication to its own station and when long test data exists based on the content of the command C, a high-speed reception section 26 is driven to receive succeeding long sentence data DT. As soon as the reception of long text data DT is finished, the test data detection section 24 restores to the reception state via a low-speed reception section 27.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Summary] Test data is composed of a preamble foretelling the start of the test data, a command, a destination address, a local station address, and long data. The test data is scrambled, the part excluding the long data is transmitted at the low speed, and the other part is transmitted at the high speed, and on the receiving side, the test data is moxibusted by a test data detection unit having a descrambling function, If there is long text data based on the command content, the long text data is received by the high speed reception section.

[Industrial application field]

The present invention relates to an improvement of a test data transmission method for a modem having a transmission speed of 2400 bps or more.

(Prior Art) FIG. 4(a) is a diagram showing an example of a data transmission system using a conventional modem.

FIG. 4 (bl is a diagram showing an example of a conventional multipoint connection.

FIG. 4(C) is an explanatory diagram of a conventional modem test data transmission method.

In the figure, 1 to n are modems, respectively, and 10 is a master station modem.

The same symbols represent the same objects throughout the following discussion.

Figure 4 (In al, the method of sending commands such as loop test from modem 1 on the sending side to modem 2 on the receiving side uses the in-band method, which interrupts normal data transmission and transmits it, and the secondary channel. There is an out-of-band method to do this.

FIG. 4 fc) is an explanatory diagram of an in-band method in which test data is interrupted into normal data transmission, where D represents normal transmission data and T represents test data. In this case,
Normal transmission data D is transmitted at 9600 bps,
Test data T is transmitted at 300 bps.

In this case, the processor of modem 2 on the receiving side receives test data T.
When the test data T is received, it is necessary to perform various processes corresponding to the received test data T. Therefore, when the test data T is sent at a high speed, it may be impossible to follow the test data T. A method was adopted to reduce the transmission speed.

[Problem that the invention seeks to solve]

If we adopt the conventional test data transmission method like this while heating, it is possible to send long data such as setting information as test data from modem 1 on the sending side to modem 2 on the receiving side, or when sending long data such as setting information as shown in Figure 4 ( When transmitting test data sequentially from the master station 10 to each slave station modem 1 to port, as in the case of the multi-point connection shown in b), it takes a long time to transmit the test data, and the line usage efficiency is reduced. There was a drawback that it decreased.

[Means for solving problems]

The above problem is solved by the test control unit 2 as shown in the principle diagram in Figure 1.
In a so-called in-band modem that drives the selector switch 21 with 0 and transmits normal transmission data at high speed and transmits test data at low speed, test data is transmitted, and a preamble and command that foretell the start of test data are used. , the other party's address, the own address, and long text data. On the transmitting side, after the test data is scrambled by the test control unit 20, the part of the test data excluding the long text data is transmitted at a low speed. This problem can be solved by transmitting only long text data at high speed and providing the test data detection section 24, command discrimination section 25, and high-speed reception section 26 on the receiving side.

(Operation) According to the present invention, the test data detecting section 24 descrambles and detects the previously scrambled test data, and when the own station is called, the command discriminating section 25 examines the contents of the command. The presence or absence of long text data is determined, and if there is long text data, the high speed receiving section 26 is driven to receive the long text data, so test data including long text data can be transmitted within a short time.

〔Example〕

FIG. 2 is a diagram showing an embodiment of the test data transmission method according to the present invention.

FIG. 3 is an explanatory diagram of the present invention.

In the figure, 20 is a test control section (transmission side), 21 is a changeover switch, 22 is a modem modulation section, 23 is a modem demodulation section, 24
25 is a test data detection unit, 25 is a command discrimination unit, 26 is a high-speed reception unit, 27 is a low-speed reception unit, and 28 is a test control unit (
receiving side).

The test data T0 in the present invention has the configuration shown in FIG.

In the case of long test data consisting of address AR1 and own station address A, long data DT is added after the own station address A as shown in Fig. 3fbl. The address A is transmitted at a low speed, for example, 300 hps, as in the conventional method, and the long text data D to be added is transmitted at a high speed, for example, 1200 bps. The high speed in this case is not limited to 1200 bps, but is set to the highest speed possible for the modem used.

After transmitting the test data T0 according to the present invention, the receiving mode is returned to the original low speed, for example, 300 bps, in preparation for receiving the next test data T0.

The preamble is advance notice data for sending the test data T, and is composed of continuous "l" or continuous "0".

Furthermore, in order to distinguish between the test data T0 and the normal transmission data D, the test data T0 is scrambled and transmitted.

The present invention will be described in detail below with reference to FIG.

The modem according to the present invention has the equipment configuration shown in FIG.
The normal transmission data D input manually from the terminal a and the test data T0 created based on the control signal input from the terminal A are switched and sent to the line side.

As mentioned above, the test control unit 20 also controls the preamble P, command C°, and partner station address AR1 shown in FIG. 3(a).
and own station address A, test data T0 consisting of
This signal is scrambled and transmitted via the modem modulator 22.

On the receiving side, the reception signal 18 is always received via the modem demodulation section 23, and the test data detection section 24 receives the received signal via the low-speed reception section 27, and descrambles the received signal. When the test data detection unit 24 detects the preamble P, it determines that the signal is the test data T,
Based on the partner station address Ao and the own station address A, it is determined whether the communication is addressed to the own station.

If the communication is for the own station, the command determination section 25 determines the contents of the command C, and if it is long test data based on the contents of the command C, the high-speed reception section 26 is driven to receive the subsequent long data D, receive. Long text data D,
Upon completion of reception, the test data detecting section 24 returns to the receiving state via the low-speed receiving section 27.

Among the commands, loop control and the like do not have long text data DT, but setting-related commands have long text data D.

〔Effect of the invention〕

As described in detail above, according to the present invention, long text data included in test data is transmitted at high speed, resulting in a significant effect of increasing transmission efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the principle of the present invention. FIG. 2 is a diagram showing an embodiment of the test data transmission method according to the present invention. FIG. 3 is an explanatory diagram of the present invention. Figure 4 (a) is a diagram showing an example of a data transmission method using a conventional modem, Figure 4 (bl is a diagram showing an example of a conventional multi-point connection, and Figure 4 (C1 is a diagram showing a conventional modem test). It is an explanatory diagram of a data transmission method. In the figure, 1 to n are modems, 10 is a master station modem,
20 is a test control section (transmission side 3 side), 21 is a changeover switch, 22 is a modem modulation section, 23 is a modem demodulation section, 24 is a test data detection section, 25 is a command discrimination section, 26 is a high speed reception section, 27 is a The low-speed receiving section 28 is a test control section (receiving side). Fig. 3 (al) Fig. 3 ('b) An explanatory diagram of the present invention Fig. 3 A diagram showing an example of a data transmission method using a conventional modem Fig. 4 (al) A diagram showing an example of a conventional multi-point connection Figure 4 (bl) Explanatory diagram of the conventional modem test data transmission method Figure 4 (
C1

Claims (1)

[Claims] In a data transmission system that transmits normal transmission data at a high speed and transmits test data at a low speed, the test data is transmitted by a preamble, a command, a destination address, a preamble foretelling the start of the test data, a command, a destination address, etc. It consists of the own station address and long text data, and after the test data is scrambled by the test control unit (20) on the transmitting side, the part of the test data excluding the long text data is transmitted at the low speed, Only the long text data is transmitted at high speed, and the receiving side is provided with a test data detection section (24), a command discrimination section (25), and a high speed reception section (26), and the test data detection section (24) scrambles the data. Descrambles and detects the test data, and if the local station is called, the command determination unit (25) examines the contents of the command to determine whether or not the long text data exists, and determines whether the long text data is present. A test data transmission method characterized in that the high-speed receiving section (26) is driven to receive the long text data when the data is available.