KR950002266B1 - Multi-modem apparatus having self-testing method - Google Patents

Abstract

The multi modem with a pattern generator and a pattern detector for self diagnosing its function includes a relay (4) inputting the low speed transmission signal lines (a-d) and low speed receiving output lines (a'-d'), a multiplexor (1) multiplying the low speed data to the high speed one, a reverse multiplexor (2) multiplexing the multiplexed high speed data to the low speed one reversely, and a controller (3) checking if the error is included in the data pattern after receiving the multiplied high speed data

Description

Self-checking muldem device

1 is a circuit diagram of the present invention.

＊ Explanation of symbols on main parts of drawing

1: multiplexer 2: demultiplexer,

3: control unit 4: relay unit

11: transmission buffer 12: multiplexer

21: third selector 22: reception buffer

23: fourth selector 24: first demultiplexer

31: pattern generator 32: pattern detector

33: control unit 34: control interface

35: second selector 36: second demultiplexer

37: the first selector

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-modem device, and more particularly, to a multi-modem device having a built-in pattern generator and a pattern detector to enable self-test.

Conventional muldem device is composed of a multiplexer for multiplexing a plurality of low-speed signals using a multiplexer to generate a high-speed signal, and a portion for demultiplexing the one high-speed signal through a demultiplexer, one multiple call content It is used to connect by line. When installing the apparatus for the purpose of multiplexing or when determining whether there is a failure for the apparatus during operation, conventionally connecting a measurement pattern generator that generates predetermined random data to the low-speed signal transmission input terminal of the remote device. In this way, the signal converted into a high-speed signal by the multiplexer is fed back inside the modem device to which the signal of the pattern generator is input. That is, by receiving the high speed signal from the output of the demultiplexer in the muldem system and receiving the low speed wave signal from the pattern detection measuring instrument, the monitor detects the presence or absence of a predetermined pattern signal generated by the measurement pattern generator. The failure of the modem device was read.

Therefore, the conventional diagnostic method for the muldem device has a problem that must be irradiated from the outside of the device using a separate measuring device.

Disclosure of Invention The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a remote device which enables self-diagnosis of the remote device by mounting the external measuring device in the remote device.

The circuit of the present invention for achieving the object of the present invention is a relay means for inputting the low speed transmission signal lines (a to d) and the low speed reception output lines (a 'to d'), and switched by the control signal 34a (4) and: multiplexing means for multiplexing low speed data output from the relay means at high speed (1) and: demultiplexing means for demultiplexing data converted at high speed by the multiplexing means at low speed (2) and: data It is composed of control means (3) which generates a pattern and monitors whether or not an error has occurred in the data pattern by inputting high-speed data converted at high speed by the multiplexing means.

Referring to FIG. 1, the circuit configuration and operation of the present invention constructed in accordance with the present invention will be described in detail below.

Figure 1 shows the overall schematic diagram of the muldem device capable of self-check by pattern error measurement. The multiplexer 1 on the upper side of FIG. 1 includes a transmission buffer buffer 11 and a multiplexer 12, and multiplexes a low-speed transmission signal and transmits the data as high-speed data. The lower demultiplexer 2 of FIG. 1 includes a third selector 21, a reception buffer 22, a first demultiplexer 24, and a fourth selector. The demultiplexer 2 demultiplexes the high-speed transmission signal data into low-speed data. send.

And a pattern generator 31, a pattern detector 32, a first selector 37, a second demultiplexer 36 and a second selector 35 in the control unit 3, by the command of the control device 33. Controls monitoring of the modem device.

The pattern generator 31 in the control unit 3 generates random data by the command of the control device 33. In the present invention, two kinds of data, D₁ data (1,544 Mb / s) and D2 data, are selected according to the selection. Low data rate (6.312 Mb / s) can be generated. The random data generated from the pattern generator 31 is input to the third selector 21 of the demultiplexer 2. The third selector 21 selects data from the first demultiplexer 24 when the remote device is presently used, but selects random data from the pattern generator 31 in case of preliminary use.

The second selector 35 in the control unit 3 selects the high speed data from the multiplexer 1 in order to monitor the data abnormality of the remote device. Data output from the second selector 35 is demultiplexed by the second demultiplexer 36 and input to the first selector 37, and is also input from the first demultiplexer 24 in the demultiplexer 2. Data is also entered. Accordingly, the first selector 37 selects random data 17 from the second multiplexer 36 and monitors the first demultiplexer 24 in order to monitor the multiplexer 12 and the second demultiplexer 36. Data from the first demultiplexer 24 is selected for monitoring.

The pattern detector 32 is connected to the first selector 37, receives data selected from the first selector 37, and searches for an error in the data. The search result of the pattern detector 32 is transmitted to the control device 33 via the bus 33a by the control interface 34 so that the control device 33 can know the internal circuit state of the remote device. have.

Hereinafter, the monitoring path by the command of the control device 33 according to the low speed data D 'and D2 selection will be described in detail.

First, the case where D 경우 data is selected will be described.

The built-in pattern generator 31 in the modem device according to the present invention generates random data in response to a predetermined command of the control device 33 according to the D'data selection (in this embodiment, the random data is 1.544 Mb / s). The generated random data is input to the third selector 21 in the demultiplexer 2 through the output 31a of the pattern generator 31 under the control of the signal 34d of the control interface 34. This random data is input to the reception buffer buffer 22 provided with four channels in this embodiment. The reception buffer 22 outputs the input data to each of the reception lines a 'to d', and is also connected to the relay unit 4 connected to the multiplexer 1 to control the controller 3. The control signal 34a of the control interface 34 is received and the data is fed back to the multiplexer 1. Therefore, the random data is input to the transmission buffer 11, the data read in the transmission buffer 11 is multiplexed by the multiplexer 12, the second selector 35, the demultiplexer 2 in the control unit 3 Is inputted to the fourth selector 23 in < RTI ID = 0.0 >

The second selector 35 and the fourth selector 23 select random data from the multiplexer 12 in order to monitor the data path of only the muldem circuit of FIG.

The data passing through the fourth selector 23 is demultiplexed by the first demultiplexer 24 to be converted into four D? Data. In addition, the data passing through the second selector 35 is demultiplexed by the second demultiplexer 36 to form four D? Data.

The first selector 37 selects random data of the first demultiplexer 24 in order to examine the multiplexer 12 of the multiplexer 1 and the first demultiplexer 24 of the demultiplexer 2. In order to check the second demultiplexer 36 of (3), the second demultiplexer 36 random data is selected and controlled by the control interface 34 and the control signal 34b.

The pattern detector 32 is controlled by the control interface control signal 34b. The pattern detector 32 receives the demultiplexed random data from the first selector 37 and the random data from the pattern generator 31 passes through the device. Find out if it happened. The error detected by the pattern detector 32 is transmitted to the control device 33 via the bus 33a by the control interface 34 so that the error can be known.

The case of D₁ data has been described so far, and the following describes the case where D₂ data is selected.

The generated random data is output 31a of the pattern generator 31 in accordance with the control of the signal 34d of the control interface 34 by the third selector 21 in the demultiplexer 2 as in the case of selecting the D? Data. Is entered through). The random data passes through the first channel in the reception buffer buffer 22 having four channels and is fed back to the transmission line by the relay unit 4 to enter the channel input in the transmission buffer buffer 11.

The random data read from the transmission buffer 11 is not multiplexed by the multiplexer 12, but is directly input to the second selector 35 and the fourth selector 23, and exits to the high speed transmission line 1a. The random data passing through the fourth selector 23 directly enters the first selector 37 without demultiplexing from the first demultiplexer 24, and the random data passing through the second selector 35 passes through the second demultiplexer 36. Pass directly without being demultiplexed into the input of the first selector 37.

The first selector 37 selects random data from the first demultiplexer 24 to monitor the multiplexer 12 and the first demultiplexer 24, and the second demultiplexer 36 to monitor the second demultiplexer 36. Select random data from 36).

The pattern detector 32 receives random data from the first selector 37 and searches whether an error has occurred while the random data generated from the pattern generator 1 passes through the monitoring path. The pattern detector 32 measures the rate of the detected error and transmits it to the control device 33 via the control interface 34 and the bus 33a.

As a circuit of the present invention, a pattern generator and a pattern detector in which a multiplexing device is built into a muldem device without using an external measuring device can be used to determine whether a malfunction of the muldem device is present during the device test, and can be frequently checked through a switching device during use. There is an effect of improving the availability of the multiplexer.

Claims (4)

The relay means 4 which is inputted as the low speed transmission signal lines a to d and the low speed reception output lines a 'to d', and is switched by the control signal 34a, and the low speed data output from the relay means. Means for multiplexing at high speed; demultiplexing means (2) for demultiplexing data converted at high speed by said multiplexing means at low speed: generating a data pattern, and converting at high speed by said multiplexing means And a control means (3) for monitoring and controlling whether or not an error has occurred in the data pattern by inputting the high speed data. 5. The multiplexing means (1) according to claim 4, wherein the multiplexing means (1) comprises a transmission buffering means (11) for receiving random data from the relay means (4), and multiplexer means (12) for multiplexing the received random data at high speed. Self-checking muldem device comprising a. 5. The apparatus of claim 4, wherein the multiplexing means (2) comprises: fourth selector means (23) for selecting one of the high speed data and the high speed transmission signal, and first demultiplexer means (24) for demultiplexing the received high speed data. And a third selector means (21) for selecting one of the demultiplexed data and control data according to a control signal from the control means (3), and a reception buffer buffer (22). Detectable Muldem Device. The method according to any one of claims 4 to 6, wherein the control means (3) comprises: a pattern generator (31) for generating random data by the command of the control device (33) and outputting it to the third selector (21); A second selector 35 for selecting one of the high-speed data and the high-speed transmission signal from the multiplexing means, a second demultiplexer 36 for demultiplexing the received high-speed data, and the inverse from the second demultiplexer A first selector 37 for selecting one of multiplexed data and demultiplexed data from the first demultiplexer, and pattern detection means for receiving data from the first selector 37 and searching for an error occurrence ( 32), wherein said respective means are controlled by said control device (33).

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