JP2868450B2 - Data signal monitoring system for digital wireless transceiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data signal monitoring system for a digital radio transceiver having a transmitting unit including a transmitting and receiving terminal device and a transmitting device, and a receiving unit including a receiving device and a receiving and transmitting terminal device. The present invention relates to a data signal monitoring system of a digital wireless transmitting / receiving apparatus suitable for a case where the apparatus and the receiving / transporting terminal apparatus are installed at remote places.

[0002]

2. Description of the Related Art A conventional digital radio transceiver of this type will be described with reference to a block diagram of FIG.

[0003] This digital radio transmitting / receiving apparatus includes a transmitting unit including a carrier terminal device (transmitting) 2 and a transmitting device 1 in a first station, and a second station located a considerable distance from the first station. And a receiving unit including a receiving device 3A and a transport terminal device (receiving) 4A. In general, between the transmitting device 1 and the transport terminal device 2 and between the receiving device 3A and the transport terminal device 4
A is often distant. The transport terminal device 2
The transmission data of a telephone, a facsimile or the like is multiplexed to generate a transmission digital signal S2 including a first frame synchronization signal and a first parity bit. This transmission digital signal S
2 may be a single channel or a plurality of channels. In the case of a plurality of channels, the transmission digital signal S2 includes a first frame synchronization signal and a first parity bit in each channel. The transmission digital signal S2 is transmitted by the transmission device 1 to a second frame synchronization signal,
After being multiplexed by adding the second parity bit and other additional signals, it is converted into a digital radio signal S3.

[0004] The digital radio signal S3 is received by the receiver 3A after propagating in a radio section formed between the first station and the second station. The receiving device 3A receives the digital radio signal S3 and demodulates it into a baseband signal.
2 corresponding to the received digital signal S4. The transport terminal device 4A converts the received digital signal S4 into the transport terminal device 2A.
Generates received data S5 corresponding to the received transmitted data. The carrier terminal device 4A also performs out-of-synchronization detection of the first frame synchronization signal and bit error increase detection by second parity bit collation.

The transmitting device 1 will be described in detail.
Bipolar / unipolar conversion circuit 11 of / U conversion unit 11
1 converts a transmission digital signal S2, which is a bipolar signal, into a unipolar signal that can be easily processed. When detecting the disconnection of the unipolar signal, the input data disconnection detection circuit 112 sends out an alarm (ALM) signal. Upon receiving the alarm signal, the transmission ALM display circuit 14 performs an alarm display of the transmission device 1 using a light emitting diode or the like. on the other hand,
The unipolar signal is multiplexed by the multiplexing circuit 12 after adding a second frame synchronization signal, a second parity bit, and other additional signals. The second frame synchronization signal is a frame signal in a wireless section. The multiplexed signal is modulated and amplified by the transmission circuit 13 and converted into a digital radio signal S3.

Next, the receiving device 3A will be described in detail. The receiving circuit 31 demodulates the radio signal S3 to generate a baseband signal. The frame synchronization detection circuit 321 of the demultiplexing unit 32 receives this baseband signal, first detects a second frame synchronization signal, and establishes frame synchronization in a wireless section. From the baseband signal synchronized by the second frame synchronization signal, the second frame synchronization signal, the second parity bit, and the additional signal are removed by the demultiplexing circuit 322, and the unipolar signal is separated into each channel. Converted to a signal. The unipolar signal is converted by the unipolar / bipolar conversion circuit 331 of the U / P conversion unit 33 into a reception digital signal S4 which is a bipolar signal.

If the frame synchronization detection circuit 321 does not detect the second frame synchronization signal, the out-of-frame detection circuit 323 sends an out-of-sync detection signal S31. In addition, the bit error detection circuit 324 is configured to output the second band included in the baseband signal from the frame synchronization detection circuit 321.
The bit error of the baseband signal is detected by checking the parity bit of the baseband signal. When the bit error exceeds a predetermined error rate, the bit error of the baseband signal is increased and the bit error detection signal S32 is transmitted. Further, the output data disconnection detection circuit 332 in the U / P conversion unit 33
Sends out an output data disconnection detection signal S33 upon detecting each signal disconnection of the unipolar signal. When receiving at least one of the out-of-synchronization detection signal S31, the bit error detection signal S32, and the output data disconnection detection signal S33, the reception ALM display circuit 34 determines that the data signal passing through the receiving device 3A is not normal and generates an alarm by a light emitting diode or the like. Display was done. The operator of the digital wireless transmitting / receiving device is usually located near the transmitting device 1 that transmits the digital wireless signal S3 to the receiving device 3A or the receiving device in another station, and is engaged in maintenance work of the digital wireless transmitting / receiving device. doing.

[0008]

In the above-described data signal monitoring in the conventional digital radio transmitting / receiving apparatus, with respect to the receiving apparatus 3A, after the demultiplexing circuit 322, the data signal is inputted to the input of the unipolar / bipolar conversion circuit 331. Only a signal disconnection is detected. For example, a logic gate failure in the demultiplexing circuit 322 does not lead to a signal disconnection, and there is a problem that a data signal abnormality cannot be detected.

In order to detect the above-mentioned data signal abnormality by the receiving apparatus 3A, it is necessary to further provide a first frame synchronization signal detection circuit and a first parity bit collation circuit, but this increases the circuit scale. In addition, there is a problem that the failure rate is increased and the reliability of the device is impaired.

[0010] Even if the data signal abnormality cannot be detected by the receiving device 3A, an alarm due to the data signal abnormality is activated by the transport terminal device 4A. However, as described above, the transport terminal device 4A is separated from the receiving device 3A. In many cases, there is a problem that time is wasted until an operator recognizes an alarm of the transport terminal device 4A and performs recovery from a failure.

[0011]

SUMMARY OF THE INVENTION A data signal monitoring system for a digital radio transceiver according to the present invention includes a transmission carrier terminal device for generating a transmission digital signal including a first frame synchronization signal and a first parity bit from transmission data. A transmitting device that converts the transmission digital signal into a digital radio signal including a second frame synchronization signal and a second parity bit and transmits the digital radio signal, a reception device that receives the digital radio signal and generates a reception digital signal, In a data signal monitoring system for a digital wireless transmitting / receiving apparatus comprising: a receiving carrier terminal device that generates received data from the received digital signal, the receiving carrier terminal device detects out-of-synchronization of the first frame synchronization signal in the received digital signal. And checking for an increase in bit error by comparing the first parity bit. Receiving-end alarm sending means for sending a receiving-end alarm signal when receiving at least one of the receiving-end alarm signals, wherein the receiving device displays a receiving-end alarm signal when receiving the receiving-end alarm signal. Prepare.

[0012] One of the data signal monitoring systems of the digital wireless transmitting and receiving apparatus is that the receiving end alarm sending means includes:
An OR circuit that takes an OR gate of an out-of-sync detection signal that is a detection result of the out-of-sync of the first frame synchronization signal and a bit error detection signal that is a detection result of an increase in the bit error; A relay circuit for generating an open signal when "1" is provided, and the receiving end alarm display means may include a first light emitting diode circuit that emits light when receiving the open signal.

Another one of the data signal monitoring systems of the digital radio transmitting / receiving apparatus is characterized in that the receiving end alarm sending means includes an out-of-synchronization detection signal which is a detection result of the out-of-synchronization of the first frame synchronization signal and the bit O which is ORed with a bit error detection signal which is a result of detection of an increase in error
An R circuit, and a buffer circuit for generating a 0 voltage when the output of the OR circuit is "1", wherein the receiving end alarm display means receives the 0 voltage in the diode section and outputs a signal of a predetermined voltage from the transistor section. A photocoupler that produces
A second light-emitting diode circuit that emits light when it receives the signal of the predetermined voltage.

[0014]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a receiving unit according to an embodiment of the present invention.

A digital radio transmitting / receiving apparatus according to one embodiment of the present invention includes the receiving apparatus 3 and the carrier terminal apparatus 4 shown in FIG. 1, and the transmitting apparatus 1 and the carrier terminal apparatus 2 shown in FIG. . The receiving device 3 includes, in addition to the components of the receiving device 3A that performs the same operation as the related art, a receiving end ALM.
A display device 35 and a receiving end ALM receiving circuit 36 are provided. The receiving device 3 is the same as the transmitting device 1 according to the related art.
Receives the digital wireless signal S3 from the.

The carrier terminal device 4 also performs the same operations as those of the prior art, ie, the components of the carrier terminal device 4A, that is, the demultiplexing circuit 41, the frame synchronization detection circuit 42, the bit error detection circuit 44, and the frame synchronization detection. Circuit 4
5 and a receiving end ALM sending circuit 43. The frame synchronization detection circuit 42 of the carrier terminal device 4 receives the received digital signal S4, detects a first frame synchronization signal from this signal S4, and synchronizes the received digital signal S4 with the frame. The received digital signal synchronized by the first frame synchronization signal is removed from the first frame synchronization signal, the first parity bit and the additional signal by the demultiplexing circuit 41, and is separated into respective channels. The received data S5 corresponding to the transmitted data is generated.

Here, the frame synchronization detection circuit 42
If no frame synchronization signal is detected, the out-of-frame detection circuit 45 sends out the out-of-sync detection signal S42. Further, the bit error detection circuit 44 detects the bit error of the received digital signal by checking the first parity bit included in the received digital signal from the frame synchronization detection circuit 42. For example, if it exceeds 1 × 10 ⁻³ or 1 × 10 ⁻⁴ , the bit error of the received digital signal is increased and the bit error detection signal S41 is transmitted. When receiving at least one of the out-of-sync detection signal S42 and the bit error detection signal S41, the receiving end ALM sending circuit 43 sends out the receiving end alarm signal S1 assuming that the data signal passing through the carrier terminal device 4 is not normal.

The receiving end ALM receiving circuit 36 of the receiving device 3
Upon receiving the receiving end ALM signal S1, a predetermined voltage is generated, and the predetermined voltage is sent to the receiving end ALM display circuit 35. When receiving the predetermined voltage from the receiving-end ALM receiving circuit, the receiving-end ALM display circuit 35 displays a receiving-end alarm indicating an abnormality of the data signal in the transport terminal device 4.

As described above, the digital radio transmitting / receiving apparatus according to the present embodiment displays an abnormality of the received digital signal S4 detected by the carrier terminal apparatus 4 on the receiving apparatus 3, so that the abnormality / failure of the receiving apparatus 3 can be promptly determined. There is an effect that detection can be performed with a simple circuit configuration.

FIG. 2 shows an alarm circuit for transmitting and receiving the data monitoring signal S1 in FIG.
3 (indicated by 43A), the receiving end ALM receiving circuit 36 (36A
3 is a detailed diagram of a first example of the receiving end ALM display circuit 35.

In the receiving end ALM sending circuit 43A, the OR circuit 431 outputs an out-of-synchronization detection signal S42 which is a detection result of the out-of-synchronization of the first frame synchronization signal and a bit error detection signal S41 which is a detection result of an increase in the bit error. OR gate of When the output of the OR circuit 431 is “1”, the relay circuit 432 opens the terminals. The receiving-end ALM sending circuit 43A connects the receiving-end ALM circuit 36A with two lines connected to the two terminals of the relay circuit 432, respectively.
An open signal is generated in the M receiving circuit 36A. When receiving the open signal at the input terminal of the inverter 361, the receiving terminal ALM receiving circuit 36A inverts the voltage at the output terminal of the inverter 361 from + 5V to the ground potential. Light emitting diode 351 applying +5 V to the anode in receiving end ALM display circuit 35
Receives the ground potential at the cathode, emits light, and displays a data signal abnormality in the transport terminal device 4 on the receiving device 3.

FIG. 3 shows an alarm circuit for transmitting and receiving the data monitoring signal S1 in FIG.
3 (shown by 43B), the receiving end ALM receiving circuit 36 (36B
7 is a detailed view of a second example of the receiving end ALM display circuit 35.

In the receiving end ALM sending circuit 43B, an OR circuit 431 takes an OR gate of the out-of-synchronization detection signal S42 and the bit error detection signal S41. When the output of the OR circuit 431 is “1”, the output buffer 433 inverts the voltage between the output terminals from +5 V to 0 voltage. Receiver ALM sending circuit 43
B is an output buffer 43 between the receiving end ALM circuit 36B and the receiving end ALM circuit 36B.
3 are connected by two wires respectively connected to the output terminal. The output voltage of the output buffer 433 is applied to the diode section of the photocoupler 362 of the circuit 36B. When the photocoupler 362 receives 0 voltage from the output buffer 433, the output voltage of the transistor section of the photocoupler 362 is inverted from the ground potential to + 5V. Then, the output terminal of the inverter 361 connected to the transistor unit is inverted from + 5V to the ground potential. The light emitting diode 351 applying +5 V to the anode in the receiving end ALM display circuit 35 emits light by receiving the ground potential at the cathode, and displays the data signal abnormality in the transport terminal device 4 on the receiving device 3.

[0024]

As described above, according to the present invention, the receiving and transmitting terminal apparatus detects an out-of-synchronization of the first frame synchronization signal in the received digital signal and detects an increase in the bit error by checking the first parity bit. Since the receiving device includes receiving end alarm sending means for sending a receiving end alarm signal when receiving at least one of the receiving end alarm signals, the receiving device includes receiving end alarm displaying means for displaying a receiving end alarm when receiving the receiving end alarm signal. There is an effect that abnormality / failure of the receiving device 3 can be detected quickly and with a simple circuit configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a receiving unit of a digital wireless transmitting / receiving apparatus according to an embodiment of the present invention.

FIG. 2 is a detailed diagram of a first example of an alarm circuit that transmits and receives the data monitoring signal S1 in FIG.

FIG. 3 is a detailed diagram of a second example of the alarm circuit for transmitting and receiving the data monitoring signal S1 in FIG. 1;

FIG. 4 is a block diagram of a data signal monitoring system for a digital wireless transceiver according to the related art.

[Explanation of symbols]

 Reference Signs List 3 receiving apparatus 31 receiving circuit 32 demultiplexing section 321 frame synchronization detecting circuit 322 demultiplexing circuit 323 frame out-of-synchronization detecting circuit 324 bit error detecting circuit 33 U / B converting section 331 unipolar / bipolar converting circuit 332 output data disconnection detecting circuit 34 Receiving ALM display circuit 35 Receiving end ALM display circuit 351 Light emitting diode 36, 36A, 36B Receiving end ALM receiving circuit 361 Inverter 362 Photocoupler 4 Carrier terminal device 41 Demultiplexing circuit 42 Frame synchronization detecting circuit 43, 43A, 43B Receiving end ALM transmission circuit 431 OR circuit 432 Relay circuit 433 Output buffer 44 Bit error detection circuit 45 Out of frame detection circuit

Claims (3)

(57) [Claims] 1. A transmission carrier terminal device for generating a transmission digital signal including a first frame synchronization signal and a first parity bit from transmission data, and transmitting the transmission digital signal to a second frame synchronization signal and a second parity bit. A digital radio signal comprising: a transmitting device that converts a digital radio signal into a digital radio signal and transmits the digital radio signal; a reception device that receives the digital radio signal to generate a reception digital signal; and a reception carrier terminal device that generates reception data from the reception digital signal. In the data signal monitoring system of the transmission / reception device, the reception / transport terminal device may be configured to detect out-of-synchronization of the first frame synchronization signal in the received digital signal and increase of a bit error by collation of the first parity bit. Receiving end alarm sending means that sends out receiving end alarm signal when receiving at least one Wherein the receiving device, a data signal monitoring system of a digital radio transceiver, characterized in that it comprises a reception terminal alarm display means for displaying the reception terminal alarm upon receiving the receiving end alarm signal. 2. The method according to claim 1, wherein said receiving end alarm sending means is provided with said first
An OR circuit that takes an OR gate of an out-of-synchronization detection signal that is a detection result of an out-of-synchronization of the frame synchronization signal and a bit error detection signal that is a detection result of an increase in the bit error, wherein the output of the OR circuit is "1". 2. A digital wireless transceiver according to claim 1, further comprising: a relay circuit that generates an open signal when the signal is received, wherein the receiving end alarm display unit includes a first light emitting diode circuit that emits light when the open signal is received. Equipment data signal monitoring system. 3. The receiving end alarm sending means according to claim 1, wherein
An OR circuit that takes an OR gate of an out-of-synchronization detection signal that is a detection result of an out-of-synchronization of the frame synchronization signal and a bit error detection signal that is a detection result of an increase in the bit error, wherein the output of the OR circuit is "1". And a buffer circuit that generates a zero voltage when the signal is received. The receiving end alarm display means receives a photocoupler that receives the zero voltage in the diode unit and generates a predetermined voltage signal from the transistor unit, and receives the predetermined voltage signal. The data signal monitoring system according to claim 1, further comprising a second light emitting diode circuit that emits light.