JPH06318969A - Self-diagnostic device of digital line terminal device - Google Patents

Abstract

PURPOSE:To independently perform the self-diagnosis of the function of a digital line terminating device connecting with the side of a public telephone network. CONSTITUTION:This device is provided with a pattern generation part 104 generating testing pattern data for confirming the operation of each route within a digital line terminal device provided with a customer station equipment interface part 101, a line terminal part 102 and a transmission line terminal part 103, a terminal side self-diagnosis function part 105 performing the dianosis of the route by transmitting and receiving testing pattern data to and from the route between the customer station equipment interface part 101 and the line terminal part, and a subscriber side self-diagnosis function part 106 performing the diagnosis of the route by transmitting and receiving testing pattern data to and from the route between the transmission line terminal part 103 and the line terminal part 102. Further, the diagnosis of the route is performed by using the terminal side self-diagnosis function part 105 and the subscriber side self-diagnosis function part 106 and transmitting and receiving testing pattern data to and from the route between the customer station equipment interface part 101 and the transmission line terminal part 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs self-diagnosis of the main body of a digital line terminating device for connecting and communicating between a public telephone network side and a terminal device installed inside a company or inside a house. The present invention relates to a self-diagnosis device.

[0002] In recent years, digital line terminators (I interfaces) have been opened up for general consumer use, and therefore their development is actively carried out in each company. Under such circumstances, it is necessary for corporate strategy to develop a device that is equipped with a further value-added function and differentiated.

[0003]

2. Description of the Related Art FIG. 6 shows a configuration example of a conventional digital line terminating device. As shown in the figure, the digital line terminating device is roughly divided into "four functional blocks" of a home appliance interface unit 1 ', a line terminating unit 2', a transmission line terminating unit 3 ', and a power supply unit 7. The function of each block is as follows.

Home equipment interface section 1 ': Sends and receives signals to and from terminal equipment. Transformer 11 as a transmission circuit,
A driver 12, a receiver 13 as a receiving circuit, a transformer 14 and the like are included.

Line terminating unit 2 ': In order to transmit / receive the control signal and the data signal from the home appliance terminal to the subscriber side,
Performs speed conversion, burst control, and frame control.
A processing circuit 21 for performing speed conversion, burst control, and frame control is included.

Transmission line terminating unit 3 ': Sends / receives data to / from the subscriber line side (telephone station or public telephone network side). It includes a U / B (unipolar / bipolar) conversion circuit 31, a transformer 33, a line equalization / timing reproduction circuit 32, and the like.

Power supply unit 7: DC / DC converter (supply power conversion circuit), power supply, and call detection.

[0008]

The conventional digital line terminating device is a device having only basic functions based on the specifications of the public switched telephone network. For diagnosis of a communication line or diagnosis of a digital line terminating device, It is carried out from the public telephone network side to the last, and the function of independently diagnosing on the side of the line terminating device side was not provided.

The present invention has been made in view of the above circumstances, and an object of the present invention is to perform a fault diagnosis, which has been conventionally performed on the public telephone network side, on the main side of a digital line terminating device to thereby prevent a fault. The purpose is to enable self-diagnosis as to whether or not the device body is functioning normally.

[0010]

FIG. 1 is a diagram illustrating the principle of the present invention. As one form, the self-diagnosis apparatus for a digital line terminating device of the present invention is a digital line terminating device including a home appliance interface unit 101, a line terminating unit 102 and a transmission line terminating unit 103. A pattern generation unit 104 for generating test pattern data for confirming whether or not each route is operating normally, and a home device interface unit 10
1, a terminal side self-diagnosis function unit 105 that transmits / receives test pattern data to / from a route between the line 1 and the line terminating unit 102 to diagnose whether the route is functioning normally, the transmission line terminating unit 102, and the line. The subscriber-side self-diagnosis function unit 106 that transmits / receives test pattern data to / from the route between the terminal units 103 to diagnose whether or not the route is functioning normally.
In addition, the terminal-side self-diagnosis function unit 105 and the subscriber-side self-diagnosis function unit 106 are used to transmit and receive test pattern data to and from the route between the home appliance interface unit 101 and the transmission line termination unit 103, It is configured to be able to diagnose whether or not it is functioning normally.

In another form, the self-diagnosis device for a digital line termination device of the present invention is a digital line termination device for connecting and communicating between a public telephone network and a terminal device installed inside a company or inside a house. In the equipment, the pattern generating means for generating the test pattern data and each functional part in the digital line terminating device are individually confirmed in order to confirm whether or not each functional part in the digital line terminating device is operating normally. Or route setting means for appropriately setting a route for transmitting / receiving the test pattern data across each functional part, and test pattern data transmitting / receiving means for transmitting / receiving the test pattern data of the pattern generating means to the route set by the route setting means. , The test pattern data before transmission is compared with the test pattern data passing through the set route, and the / Is obtained and a determination means for determining abnormality.

[0012]

In the former form of the self-diagnosis device for a digital line terminal device, the pattern generation unit 104 generates test pattern data, and the terminal-side self-diagnosis function unit 105 transfers this test pattern data to the home device interface unit 101. Transmission / reception is performed with respect to the route between the line termination units 102 to check the match / mismatch of the transmitted / received data to diagnose whether or not the route is functioning normally. Similarly,
In the subscriber-side self-diagnosis function unit 106, the transmission line termination unit 10
2 transmits / receives the test pattern data to / from the route between the line 2 and the line terminating unit 103, and checks whether the transmission / reception data match / mismatch.
Diagnose whether the route is functioning normally.
Furthermore, the terminal side self-diagnosis function unit 105 and the subscriber-side self-diagnosis function unit 106 are used to send and receive test pattern data to and from the route between the home appliance interface unit 101 and the transmission line termination unit 103, and the route is normally operated. Diagnose whether it is functioning.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a self-diagnosis device for a digital line terminating device as an embodiment of the present invention. In the figure, 1 is a home device interface, 2 is a line terminating part, 3 is a transmission line terminating part, 4 is a pattern generating circuit, 5 is a terminal side self-diagnosis circuit, and 6 is a subscriber side self-diagnosis circuit.

The in-home device interface unit 1 is a circuit for transmitting / receiving the signal to / from the terminal device as described above, and the transmitting / receiving path changeover switches SW and SW for performing self-diagnosis.
Equipped with. Of these, the switch SW is provided in the input stage of the driver 12 on the transmission circuit side, and the switch SW is provided in the output stage of the receiver 13 on the reception circuit side.

The line terminating unit 2 converts the speed as described above.
A circuit for performing burst control, frame control, etc., and transmission / reception path changeover switches SW, S for self-diagnosis
Equipped with W. Among these, the switch SW is provided in the transmission side input stage of the processing circuit 21 that performs speed conversion and the like, and the switch SW is provided in the reception side output stage.

The transmission line terminating unit 3 is a circuit for transmitting / receiving data to / from the subscriber line side as described above, and includes a transmission / reception path changeover switch SW for performing self-diagnosis. The switch SW is provided at the connection point of the transformer 33 on the public telephone network side.

The pattern generation circuit 4 transmits fixed test pattern data necessary for self-diagnosis of whether each route in the digital line terminating equipment is operating normally to the self-diagnosis circuits 5 and 6. Circuit.

FIG. 3 shows a detailed structure of the pattern generating circuit 4. As shown in the figure, it is composed of a pattern generation unit 41 and a pattern generation control unit 42. The pattern generator 41 stores fixed pattern data prepared in advance in the ROM. This fixed pattern data has a byte structure as shown in FIG. That is, the fixed pattern data has a total length of 8 bytes, the first 1 byte and the last 1 byte are all "1", and the intermediate 2 to 7 bytes are all 1 byte except all "1". Other than the data structure of, the contents are not specifically determined.

The first 1 byte is a portion corresponding to the network address of the packet transmitted and received on the network as shown in FIG. 4B, and therefore the fixed pattern data described above is a test. At some times, fixed pattern data has a data structure in which the network address is masked so that the fixed line data is not accidentally sent from the transmission line terminating unit 3 to the network side.

The pattern generation control unit 42 has a function of setting a path for the selectors 52 and 62, which will be described later, and accesses the fixed pattern generation unit 41 to read fixed pattern data.
It has a function of transmitting to 1 and 61.

Each signal line in FIG. 3 has the following meaning. 4 _a : Pattern generation control unit 42 to pattern generation unit 41
To the pattern transmission request signal line 4 _b1 : Data storage request signal line to the determination circuit 51 or storage end signal line from the determination circuit 51 4 _c1 : Data transmission request signal line to the selector 52 or reception completion signal from the selector 52 Line 4 _d1 : Data storage request signal line to the determination circuit 61 or storage end signal line from the determination circuit 61 4 _e1 : Data transmission request signal line to the selector 62 or reception completion signal line from the selector 62 4 _b2 : Determination circuit Data bus for sending fixed pattern data to 51 4 _c2 : Data bus for sending fixed pattern data to selector 52 4 _d2 : Data bus for sending fixed pattern data to judgment circuit 61 4 _e2 : Fixing to selector 62 Data bus for sending pattern data

The terminal-side self-diagnosis circuit 5 determines whether or not the transmission / reception loop on the terminal side (here, the loop within the home equipment interface section 1 and the loop between the home equipment interface section 1 and the line termination section 2) is operating normally. This is a circuit for self-diagnosis. This terminal-side self-diagnosis circuit 5 includes switches SW, SW, buffer memories BM, BM, BM connected to SW, a judgment circuit 51 for judging normality / abnormality of a transmission / reception loop on the terminal side, and fixed pattern data for testing. 52 for switching between transmitting and receiving in each direction
Etc.

The subscriber-side self-diagnosis circuit 6 determines whether or not the transmission / reception loop (here, the loop between the transmission line terminating portion 3 and the line terminating portion 2) on the subscriber line side (public telephone network) is operating normally. This is a circuit for self-diagnosis of. The subscriber-side self-diagnosis circuit 6 includes switches SW, buffer memories BM and BM connected to SW, a determination circuit 62 for determining normality / abnormality of a transmission / reception loop on the subscriber line side, and fixed pattern data for testing. It is configured to include a selector 62 for switching transmission / reception in each direction.

FIG. 5 shows a configuration example of the judgment circuits 52 and 62 in the terminal side self-diagnosis circuit 5 and the subscriber side self-diagnosis circuit 6 described above. As shown, the fixed pattern storage unit 5
12, 612 and fixed pattern comparison units 511, 611.

The fixed pattern storage unit has a function of receiving and storing fixed pattern data from the pattern generation circuit. The fixed pattern comparison unit receives fixed pattern data passing through an arbitrary path by the route passing fixed pattern reception unit, and compares the received data with the fixed pattern data stored in the fixed pattern storage unit in advance by an OR circuit. Then, it is determined whether or not the two data are the same, and the comparison result is sent as an alarm signal ALM. This alarm signal is finally used for "visible signal detection (LED lamp)" indicating normality / abnormality for each route provided in the device.

The operation of the apparatus of this embodiment will be described below.
In carrying out the self-diagnosis test, the pattern generating circuit 4 first instructs the selectors 52 and 62 of the route to be diagnosed. In this embodiment, seven routes are set for diagnosis. Each selector 52, 62 is
When this route instruction is received, the control signals S to S are transmitted to the switches SW to SW and the buffer memories BM to BM.
To the open / close processing of each switch SW to SW.
Here, the opening / closing process is a process for enabling / disabling communication of fixed pattern data.

The processing in each of the diagnostic routes # 1 to # 7 will be described below. Although only the process of the route # 1 will be described in detail below, it is assumed that the same process is performed for the other routes # 2 to # 7. [Processing of Route # 1] This route # 1 is for diagnosing normality / abnormality of the path route of the transmission → reception circuit in the home appliance interface unit 1. This path route # 1
Is a route output to the buffer memory BM side → the switch SW of the transmission circuit input stage → the switch SW of the reception circuit output stage → the buffer memory BM side.

(A) The pattern generating circuit 4 instructs the selector 52 to set the path of the route # 1 to be self-diagnosed, and transmits the fixed pattern data for self-diagnosis to the judging circuit 51 and the selector 52.

(B) Further, the selector 52 activates the buffer memory BM and the switch SW in the home appliance interface section 1 by the control signal S in order to establish the transmission path route.

Further, in order to establish the receiving path route, the selector 52 uses the control signal S to switch the buffer memory BM and the switch SW of the home appliance interface section 1.
Give instructions to.

The above operations (a) and (b) will be described in more detail. A signal for diagnosing the route # 1 is transmitted from the pattern generation circuit 4 to the selector 51 through the signal line _4c1 . The selector 52 outputs the signal corresponding to the route # 1 as
The switch SW is opened by the control signal S.

The pattern generation circuit 4 transmits the fixed pattern data to the determination circuit 51 via the bus 4 _b2 . Further, the pattern generation circuit 4 transmits the fixed pattern data to the selector 52 via the bus _4c2 .

Buffer memory BM, switch SW
After the fixed pattern data has passed, sends a pass completion signal to the selector 52 and closes the switch SW. Upon receiving the passage completion signal, the selector 52 opens the switch SW by the control signal S.

Buffer memory BM, switch SW
Sends a passage completion signal to the selector 52 after the data pattern has passed, and also closes the switch SW. The selector 52 determines the fixed pattern data from the determination circuit 51.
Send to.

(C) The judgment circuit 51 receives the fixed pattern data via the path route # 1 of the transmission → reception circuit in the in-home equipment interface unit 1 and the fixed pattern data received from the pattern generation circuit 4 in advance. It is compared to check whether the patterns are equal or not. If they are equal, a normal signal is transmitted as the alarm signal ALM, and if not, an abnormal signal is transmitted.

Here, as a judgment method in the judgment circuit 51, the first 1 byte (all "1" data) and the last 1 byte (all "1" data) of the received pattern data are fetched and transmitted in advance. Compare with the same fixed pattern data previously captured.

The following items are diagnostic items that can be performed by the self-diagnostic device through the above processing. (A) Abnormality detection of data bus of each route (b) Comparison of fixed pattern data (comparison of data pattern of fixed pattern generation part and data pattern passing through route) (c) Check of packet error detection function Setting of processing for bit, bit / steal correspondence

[Process of Route # 2] This route # 2 is for diagnosing whether the path route between the transmission circuits of the home appliance interface unit 1 and the line terminating unit 2 is normal / abnormal. The path route # 2 is the buffer memory BM side → the switch SW of the home device interface section 1 → the switch SW of the transmission circuit output stage of the line termination section 2 → the buffer memory BM
It is a route output to the side.

(A) The pattern generation circuit 4 instructs the selector 52 to set the path of the route to be self-diagnosed, and sends the fixed pattern data for self-diagnosis to the judgment circuit 51 and the selector 52.

(B) In order to establish the transmission path route, the selector 52 uses the control signal S to switch the buffer memory BM and the switch SW in the home appliance interface section 1.
And start. Further, the selector 52 gives an instruction to the buffer memory BM and the switch SW in the line terminating unit 2 by the control signal S in order to establish the reception path route.

(C) The judging circuit 51 receives the fixed pattern data that has passed through the path route of the transmitting circuit in the line terminating unit 2, compares it with the fixed pattern data received from the pattern generating circuit 4 in advance, and determines both patterns. Is transmitted. If they are equal, a normal signal is transmitted as the alarm signal ALM, and if not, an abnormal signal is transmitted.

[Processing of Route # 3] This route # 3 is for diagnosing normality / abnormality of a path route between the transmission → reception circuit of the home appliance interface 1 and the line terminating unit 2. This path route # 3 is on the buffer memory BM side →
The route is output from the switch SW of the home device interface unit 1 to the switch SW of the receiving circuit output stage of the line terminal unit 2 to the buffer memory BM side.

(A) The pattern generation circuit 4 instructs the selectors 52 and 62 to set the path of the route to be self-diagnosed, and joins the fixed pattern data for self-diagnosis with the selector 52 of the terminal-side self-diagnosis circuit 5. It is transmitted to the judgment circuit 61 of the self-diagnosis circuit 6 on the person side.

(B) Selector 5 of terminal side self-diagnosis circuit 5
2 uses the control signal S to establish the transmission path route.
The buffer memory BM and the switch SW in the in-home device interface unit 1 are activated by. Further, the selector 62 of the subscriber-side self-diagnosis circuit 6 gives an instruction to the buffer memory BM and the switch SW in the line terminating unit 2 by the control signal S in order to establish the reception path route.

(C) The judgment circuit 61 of the subscriber-side self-diagnosis circuit 6 receives fixed pattern data via the path route of the transmission → reception circuit in the line terminating unit 2 and receives it from the pattern generation circuit 4 in advance. The fixed pattern data is compared to check whether the two patterns are equal or not. If they are equal, a normal signal is transmitted as the alarm signal ALM, and if not, an abnormal signal is transmitted.

[Process of Route # 4] This route # 4 is for diagnosing normality / abnormality of the path route from the home appliance interface unit 1 to the transmission line termination unit 3 via the line termination unit 2. This path route # 4 is the switch SW of the buffer memory BM side → home device interface 1
→ line termination unit 2 → switch SW of transmission line termination unit 3 →
This route is output to the buffer memory BM side.

(A) The pattern generation circuit 4 instructs the selectors 52 and 62 to set the path of the route to be self-diagnosed, and joins the fixed pattern data for self-diagnosis with the selector 52 of the terminal-side self-diagnosis circuit 5. It is transmitted to the judgment circuit 61 of the self-diagnosis circuit 6 on the person side.

(B) Selector 5 of terminal side self-diagnosis circuit 5
2 uses the control signal S to establish the transmission path route.
The buffer memory BM and the switch SW in the in-home device interface unit 1 are activated by. Further, the selector 62 of the subscriber-side self-diagnosis circuit 6 gives an instruction to the buffer memory BM and the switch SW in the transmission line terminating unit 3 by the control signal S in order to establish the reception path route.

(C) The judgment circuit 61 of the subscriber-side self-diagnosis circuit 6 includes the home appliance interface section 1 to the line termination section 2.
Of the transmitting circuit and the fixed pattern data via the path route of the switch SW in the transmission path terminating unit 3 are compared with the fixed pattern data received from the pattern generating circuit 4 in advance to determine whether the two patterns are equal. If they are equal, a normal signal is transmitted as the alarm signal ALM, and if not, an abnormal signal is transmitted.

[Processing of Route # 5] This route # 5 is for diagnosing normality / abnormality of the path route between the receiving circuits of the transmission line terminating unit 3 and the line terminating unit 2. This path route #
A route 5 is output to the buffer memory BM side → the switch SW of the transmission line terminating unit 3 → the switch SW of the receiving circuit output stage of the line terminating unit 2 → the buffer memory BM side.

(A) The pattern generation circuit 4 instructs the selector 62 to set the path of the route to be self-diagnosed, and the fixed pattern data for self-diagnosis is selected by the selector 62 of the subscriber side self-diagnosis circuit 6 and the judgment circuit. 61 to 61.

(B) The selector 62 of the subscriber-side self-diagnosis circuit 6 uses the control signal S to establish the transmission path route.
The buffer memory BM and the switch SW in the transmission line terminating unit 3 are activated by. Further, the selector 62 of the subscriber-side self-diagnosis circuit 6 gives an instruction to the buffer memory BM and the switch SW in the line terminating unit 2 by the control signal S in order to establish the reception path route.

(C) The judgment circuit 61 of the subscriber-side self-diagnosis circuit 6 receives the fixed pattern data from the transmission line terminating unit 3 via the path route of the switch SW on the output stage side of the receiving circuit in the line terminating unit 2. , This is compared with the fixed pattern data received from the pattern generation circuit 4 in advance, and it is checked whether or not both patterns are the same. If they are the same, a normal signal is sent as the alarm signal ALM, and if not, an abnormal signal is sent. To do.

[Processing of Route # 6] The route # 6 is for diagnosing normality / abnormality of the path route between the receiving and transmitting circuits in the transmission line terminating unit 3 and the line terminating unit 2. The path route # 6 is output to the buffer memory BM side → the switch SW of the transmission line terminating unit 3 → the receiving circuit in the line terminating unit 2 → the switch SW of the transmission circuit output stage in the line terminating unit 2 → the buffer memory BM side. It is a route.

(A) The pattern generation circuit 4 instructs the selectors 52 and 62 to set the path of the route to be self-diagnosed, and sends the fixed pattern data for self-diagnosis to the selector 62 of the subscriber-side self-diagnosis circuit 6. It is transmitted to the judgment circuit 51 of the terminal side self-diagnosis circuit 5.

(B) The selector 62 of the subscriber-side self-diagnosis circuit 6 uses the control signal S to establish the transmission path route.
The buffer memory BM and the switch SW in the transmission line terminating unit 3 are activated by. Further, the selector 52 of the terminal-side self-diagnosis circuit 5 gives an instruction to the buffer memory BM and the switch SW in the line terminating unit 2 by the control signal S in order to establish the reception path route.

(C) Judgment circuit 5 of terminal side self-diagnosis circuit 5
1 is a receiving circuit in the line terminating unit 2 from the transmission line terminating unit 3 →
The fixed pattern data received via the path route of the switch SW on the output stage side of the transmission circuit is received and compared with the fixed pattern data previously received from the pattern generation circuit 4,
It is checked whether the two patterns are the same, and if they are the same, a normal signal is transmitted as the alarm signal ALM, and if not, an abnormal signal is transmitted.

[Processing of Route # 7] This route # 7 indicates normality / abnormality of the path route from the transmission line terminating unit 3 to the receiving circuit of the home device interface unit 1 via the receiving circuit in the line terminating unit 2. To diagnose. The path route # 7 is the buffer memory BM side → the switch SW of the transmission line terminating unit 3 → the receiving circuit in the line terminating unit 2 → the receiving circuit output stage switch SW in the home device interface unit 1.
→ This route is output to the buffer memory BM side.

(A) The pattern generating circuit 4 instructs the selectors 52 and 62 to set the path of the route to be self-diagnosed, and sends the fixed pattern data for self-diagnosis to the selector 62 of the subscriber-side self-diagnostic circuit 6. It is transmitted to the judgment circuit 51 of the terminal side self-diagnosis circuit 5.

(B) The selector 62 of the subscriber-side self-diagnosis circuit 6 uses the control signal S to establish the transmission path route.
The buffer memory BM and the switch SW in the transmission line terminating unit 3 are activated by. Further, the selector 52 of the terminal side self-diagnosis circuit 5 gives an instruction to the buffer memory BM and the switch SW in the in-home device interface section 1 by the control signal S in order to establish the reception path route.

(C) Judgment circuit 5 of terminal side self-diagnosis circuit 5
1 is a receiving circuit from the transmission line terminating unit 3 to the line terminating unit 2,
The fixed pattern data received via the path route of the switch SW at the output stage of the reception circuit of the in-home equipment interface unit 1 is received and compared with the fixed pattern data received from the pattern generation circuit 4 in advance to determine whether the two patterns are equal or not. If they are equal, a normal signal is transmitted as the alarm signal ALM, and if not, an abnormal signal is transmitted.

Various modifications are possible in carrying out the present invention. For example, although seven self-diagnosis routes are set in the above-described embodiment, the present invention is not limited to this, and it is possible to set a necessary route as appropriate according to the content of the self-diagnosis. For example, in the above embodiment,
Although the route that passes only the internal circuit of each functional circuit section is set only for the home device interface section 1, of course, the route that passes only the line terminal section 2 or only the transmission line terminal section 3 is set. You can also do it.

[0063]

As described above, according to the present invention, the function diagnosis of the digital line terminating device can be independently performed not on the public telephone network side but on the device main body side. As a result, as the (a) fault isolation processing, it is possible to isolate whether the abnormality is on the digital line terminal side or the public telephone network side. (B) When there is a failure on the digital line terminal side, it is possible to visually confirm which part / route is abnormal by a visual indicator such as an LED lamp based on an alarm signal. It is possible to provide a reliable digital line terminal device.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram showing a self-diagnosis device for a digital line terminating device as an embodiment of the present invention.

FIG. 3 is a block diagram showing a detailed configuration of a pattern generation circuit in the apparatus of the embodiment.

FIG. 4 is a diagram showing an example of fixed pattern data generated by a pattern generating circuit of the embodiment apparatus.

FIG. 5 is a block diagram showing a detailed configuration of a judgment circuit in the apparatus of the embodiment.

FIG. 6 is a block diagram showing a conventional digital line terminating device.

[Explanation of symbols]

1, 1'Home appliance interface section 2, 2'Line termination section 3, 3'Transmission path termination section 4 Pattern generation circuit 5 Terminal side self-diagnosis circuit 6 Subscriber side self-diagnosis circuit 7 Power supply section 11, 14, 33 Transformer 12 Driver 13 Receiver 21 Processing circuit for speed conversion / burst control / frame control 31 Unipolar / bipolar conversion circuit 32 Line equalization / timing reproduction circuit 41 Pattern generation unit 42 Pattern generation control unit 51, 61 Judgment circuit 52, 62 Selector BM to BM Buffer memory SW-SW Send / receive path changeover switch for self-diagnosis

Claims (2)

[Claims] 1. A digital line terminating device comprising a home device interface unit (101), a line terminating unit (102) and a transmission line terminating unit (103), wherein each route in the digital line terminating device operates normally. And a pattern generator (104) for generating test pattern data for confirming whether or not the test pattern data is transmitted / received to / from a route between the home appliance interface unit and the line termination unit. The terminal side self-diagnosis function unit (105) for diagnosing whether or not it is functioning normally, and the test pattern data is transmitted and received to and from the route between the transmission line terminating unit and the line terminating unit so that the route operates normally. And a subscriber-side self-diagnosis function unit (106) for diagnosing whether or not there is a home side using the terminal-side self-diagnosis function unit and the subscriber-side self-diagnosis function unit. A self-diagnosis device for a digital line terminating device configured to transmit / receive the test pattern data to / from a route between an internal device interface section and a transmission line terminating section to diagnose whether or not the route is functioning normally. 2. A digital line terminating device for connecting and communicating between a public telephone network and a terminal device installed in a company or inside a house, and a pattern generating means for generating test pattern data, and a digital line terminating device. The test pattern data is transmitted / received to / from each functional part in the digital line terminating device in order to confirm whether or not each functional part in the device is operating normally. Route setting means for appropriately setting the route, test pattern data transmitting / receiving means for transmitting / receiving the test pattern data of the pattern generating means to / from the route set by the route setting means, test pattern data before transmission and the set The test pattern data passed through the route is compared to determine whether the route is normal /
A self-diagnosis device for a digital line terminating device, comprising a judging means for judging an abnormality.