JPH06141055A - Data circuit terminating device - Google Patents

Abstract

PURPOSE:To easily detect the state of an opposite device by diagnosing an opposing data circuit terminating device. CONSTITUTION:An interface part 1 performs connection with a terminal equipment, a status code transmission part 2 converts transmission request (RS) signals inputted from the interface part 1 to transmission status codes 1a and a frame code generation part 3 generates frame code synchronized with timing signals 1b from a frame generation part 4 for alternating to binary '0' and '1' for each frame. The frame generation part 4 divides transmission data (SD signals) inputted from the interface part 1 into the data columns of n-bit length, adds 1 bit of the frame code 1 to the head of the data column, adds 1 bit of the transmission status code 2a from a selector 8 to the ending of the data column and performs conversion to the transmission signals of frame constitution. Also, the timing signals 1b synchronized with the frame length of the transmission signals are outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data line terminating device, and more particularly to a data line terminating device for diagnosing the operation of an opposing device.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing an example of a conventional data line terminating device, and FIG. 3 is a frame format diagram of a received signal and a transmitted signal of the conventional example.

A transmission request (RS) signal input via the interface section 1 is input to a status code transmission section 2 and converted into a transmission status code S. The frame code generator 3 outputs frame codes F and F'alternating binary 0 and 1 for each frame. The transmission data (SD signal) input from the terminal device via the interface unit 1 is divided into a data sequence of n bits at the frame generation unit 4, and the frame code F, F'is 1 bit at the beginning of the data sequence and the data sequence is divided. It is output as a transmission signal of a frame structure in which the status code S is added at the end of 1 bit. The transmission signal is transmitted to the line through the U / B converter 5 which converts the unipolar signal into a bipolar signal.

The bipolar signal received from the line is B / U
It is converted into a unipolar signal through the conversion unit 9 and is input to the frame synchronization establishment unit 11 and the frame decomposition unit 10 as a reception signal. The frame synchronization establishing unit 11 searches the positions of the frame codes F and F'from the received signal from the B / U conversion unit 9 and generates the timing signal 6b synchronized with the frame. In the frame disassembling unit 10, the frame synchronization establishing unit 11
The timing signal 6b is input to the received signal having a frame structure from frame codes F and F ', status codes S and n.
The data is decomposed into bit-length data D1 to Dn and output as status code and received data (RD signal). The status code receiving unit 12 sends the status code to the carrier wave (CD
Signal). The received data (RD signal) and the CD signal are output to the terminal device via the interface unit 1.

[0005]

In the above-mentioned conventional data circuit terminating device, only the data communication with the opposite device is performed, and the opposite device has a failure on the terminal side, an abnormality in the interface cable, or an interface signal. However, there is a drawback in that it is not possible for the own device to know the abnormality and the device failure.

[0006]

A data line terminating device of the present invention converts an interface unit for connecting to a terminal device, a frame code generating unit for generating a frame code, and a transmission timing signal into a status code. A status code transmission unit, an internal data transmission unit that generates and outputs internal data to be transmitted, and an internal unit that generates timing to insert 1 bit of the internal data into a frame instead of 1 bit of the status code every m frames. A data insertion unit, a selector that switches the output of the status code and the transmission internal data by a control signal from the internal data insertion unit, and a transmission signal of a frame configuration in which the selector output, the frame code, and the transmission data are input. And a U / B converter that converts the transmission signal into a bipolar signal A B / U converter that converts a bipolar signal from a line into a unipolar signal and outputs a received signal; a frame decomposer that decomposes and outputs the received signal having a frame structure into a received status code, a frame code, and a received data code; A frame synchronization establishment unit that establishes frame synchronization by the received signal, a status code reception unit that converts the received status code into a carrier wave, and a received internal data sent by 1 bit every m frames by the received status code. An internal data extraction unit, a CD signal control unit that controls the carrier wave when receiving internal data, a processing unit that processes internal data that processes the received internal data, and an output unit that outputs the processed internal data to the outside. It has the internal data transmission unit and a control unit for controlling the internal data processing unit.

[0007]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a data circuit terminating device of the present invention. FIG. 2 is a frame format diagram of a transmission signal and a reception signal of this embodiment.

The interface unit 1 connects the data line terminating device and the terminal device of this embodiment. The status code transmission unit 2 converts the transmission request (RS) signal input from the interface unit 1 into the transmission status code 1a. The frame code generator 3 generates the frame codes F and F'which alternate with the binary 0 and 1 for each frame in synchronization with the timing signal 1b from the frame generator 4. The frame generation unit 4 divides the transmission data (SD signal) input from the interface unit 1 into a data string having an n-bit length, the frame codes F and F ′ are 1 bit at the head of the data D1 to Dn, and the data code is added at the end of the data string. One bit is added to the transmission status code 2a from the selector 8 and converted into a transmission signal having a frame structure. Further, it outputs the timing signal 1b synchronized with the frame length of the transmission signal.

The U / B converter 5 converts the unipolar transmission signal into a bipolar signal and outputs it to the data line. In response to the control signal 1C from the control unit 17, the internal data transmission unit 6 sends a state signal 1d for notifying the transmission state from the terminal in the interface unit 1 and a state signal 2d for notifying the synchronization establishment state from the frame synchronization establishment unit 11. Send internal data 1
and the timing signal 4b from the internal data insertion unit 7
The transmission internal data 1e is output in synchronization with.

The internal data inserter 7 sends the transmitted internal data 1e.
Is output as transmission internal data 2e in synchronism with a frame, and a timing signal 1b generates a timing signal 4b having an m frame cycle and a control signal 4c for switching the selector 8 for each m frame. The selector 8 outputs the transmission status code 2a.

The B / U converter 9 converts the bipolar signal received from the data line into a unipolar signal and outputs it as a received signal. The frame decomposition unit 10 inputs the received signal,
The received signal is decomposed into the n-bit length data D1 to Dn sequence, the frame code F, F ', and the status code S by the timing signal 6b from the frame synchronization establishing unit 11, and the n-bit length data sequence is received data (RD signal). ) And the status code S as a reception status code. Also,
The reception signal generates a timing signal 2b synchronized with the code length of the received code, a timing signal 3b synchronized with the frame length, and a reception timing (RT signal) synchronized with the code length of the received data (RD signal).

The frame synchronization establishing section 11 searches for a frame code in the received signal based on the received signal and the timing signal 2b to establish frame synchronization, and outputs a timing signal 6b synchronized with the frame code position. The status code receiving unit 12 inputs the timing signal 3b and the reception status code and converts them into a carrier wave (CD signal) for detection.

The CD signal control unit 13 receives the CD signal from the status code receiving unit 12 and the control signal 5c and outputs the CD signal state of one frame before when the internal data is received. The internal data extraction unit 14 inputs the reception status code and the timing signal 3b, outputs the timing signal 5b synchronized with the reception internal data, and extracts the reception internal data sent by 1 bit in m frames by the reception status code. The control signal 5c notifies that the reception internal data is being received. Internal data processing unit 15
Receives the timing signal 5b, the received internal data, and the control signal 1c from the controller 17, processes the received internal data, and outputs the processed internal data. The output unit 16 outputs the internal data output from the internal data processing unit 15 to the outside. The control unit 17 receives the control signal 2c from the internal data transmission unit 6 and the internal data processing unit 15
Control signal 3c from the input terminal, and the control signal 1c controls transmission / reception of internal data.

Next, normal data communication in this embodiment will be described. The present apparatus inputs an RS signal and an SD signal from a terminal device via the interface unit 1. The SD signal is input in synchronization with the ST signal from the frame generator 4. The RS signal is input to the status code transmission unit 2, converted into a status code, and input to the selector 8 as the transmission status code 1a. The selecta 8 selects the transmission status code 1a by the control signal 4c and outputs it as the transmission status code 2a. The frame code generator 3 generates a frame code. SD signal and transmission status code 2
The a and the frame code are converted by the frame generation unit 4 into a transmission signal having a frame structure. The transmission signal is converted into a bipolar signal by the U / B converter 5 and output to the data line.

Next, the operation of this embodiment during internal data communication will be described. The internal data is generated by the internal data sending unit 6 by the control signal 1c from the control unit 17, the status signal 1d from the interface unit 1 and the status signal 2d from the frame synchronization establishing unit 11, and the internal data inserting unit 7
Is output as transmission internal data 1e having a code length of m frames in synchronization with the timing signal 4b. The transmission internal data 1e is input to the internal data insertion unit 7 and is input to the selector 8 as the transmission internal data 2e. The selector 8 switches the output for one frame every m frame cycles by the control signal 4c from the internal data insertion unit 7 and outputs the transmission internal data 2e to the frame generation unit 4 as the transmission status code 2a. Frame generator 4 and U / B converter 5
In the same manner as in the above-mentioned data communication, the frame structure of the input frame code, transmission status code 2a and SD signal is converted into a bipolar signal and output to the data line. By the above-described operation, the transmission signal of the frame structure is transmitted by switching the status code 1 bit to the internal data 1 bit every m frames.

The B / U converter 9 and the frame disassembler 10 convert the bipolar signal into a unipolar signal in the same manner as in the above-mentioned data communication, disassemble the frame and receive the received internal data as a reception status code. The reception status code is input to the status code reception unit 12 and the internal data extraction unit 14, the internal data extraction unit 14 counts with the timing signal 3b, and the internal data sent by 1 bit every m frames is extracted and received. Output as data. In the status code receiving section 12, the CD signal at the time of internal data reception is generated by the CD signal control section 13 in order to convert the reception status code into a CD signal as in the operation during the above-mentioned data communication.

The CD signal control unit 13 receives the CD signal from the status code receiving unit 12 and outputs the CD signal one frame before by the control signal 5c notifying that the internal data is being received. The received internal data is input to the internal data processing unit 15, is subjected to data processing by the control signal 1c, and is output by the output unit 16.
Is output to the outside via. The internal data X1 and X2 in the reception signal and the transmission signal having the frame structure are inserted as shown in FIG.

[0018]

As described above, according to the data line terminating device of the present invention, the status of the device itself is monitored, the monitored contents are converted into data, and one bit of the status code is converted into internal data every m frames. By switching to 1 bit and transmitting / receiving, it is possible to diagnose the opposing terminal device and to know the state of the opposing device on its own side.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a frame format diagram of a transmission signal and a reception signal of this embodiment.

FIG. 3 is a frame format diagram of a transmission signal and a reception signal of a conventional example.

FIG. 4 is a block diagram of an example of a conventional data line terminating device.

[Explanation of symbols]

 1 interface section 2 status code transmission section 3 frame code generation section 4 frame generation section 5 U / B conversion section 6 internal data transmission section 7 internal data insertion section 8 selector 9 B / U conversion section 10 frame decomposition section 11 frame synchronization establishment section 12 Status Code Reception Unit 13 CD Signal Control Unit 14 Internal Data Extraction Unit 15 Internal Data Processing Unit 16 Output Unit 17 Control Unit

Claims (1)

[Claims] 1. An interface section for connecting to a terminal device, a frame code generating section for generating a frame code, a status code transmitting section for converting a transmission timing signal into a status code, and an internal data for transmitting. An internal data sending unit for outputting, an internal data inserting unit for generating timing for inserting 1 bit of the internal data into a frame in place of 1 bit of the status code for every m frames, the status code and the transmission internal data And a selector for switching the output by a control signal from the internal data insertion unit, a frame generation unit for inputting the selector output, the frame code and transmission data to generate a transmission signal having a frame structure, and a bipolar transmission signal for the transmission signal. A U / B converter that converts the signal into a signal and a bipolar signal from the line into a unipolar signal A B / U conversion unit for converting and outputting a reception signal, a frame decomposition unit for decomposing and outputting the reception signal having a frame structure into a reception status code, a frame code and a reception data code, and frame synchronization is established by the reception signal. A frame synchronization establishment unit, a status code receiving unit that converts the received status code into a carrier wave, an internal data extraction unit that extracts received internal data sent by 1 bit every m frames by the received status code, and internal data reception CD signal control unit for controlling the carrier wave at the time, a processing unit for processing internal data for processing the received internal data, an output unit for outputting the processed internal data to the outside, the internal data transmission unit and the internal data A data line terminating device having a control unit for controlling a processing unit.