JP2000151469A - Transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly switch an active system transmission section into a standby system transmission section. SOLUTION: An active system transmission section 10 receives transmission data from an opposite station at its own reception circuit 11 via a hybrid transformer 3. Furthermore, a reception circuit 21 of a standby system transmission section 20 receives the transmission data from the hybrid transformer 3 and provides an output as received data. A comparator 4 compares the received data by the reception circuit 11 of the active system transmission section 10 with the received data by the reception circuit 21 of the standby system transmission section 20 to diagnose soundness of the reception circuit 21 of the standby system transmission section 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission system constituting a multiplex system, and more particularly to a transmission system for diagnosing transmission means or reception means.

[0002]

2. Description of the Related Art For example, FIG. 10 shows a configuration diagram of a conventional transmission system. The transmission system includes transmission devices arranged on an A side and a B side. Each transmission device includes a service transmission unit 10 and a standby transmission unit 20. Here, a duplex transmission unit will be described as an example.

First, in the local station (B side), a transmission signal from the partner station (A side) is input to the receiving circuit 11 of the service transmission unit 10 through the switch 1 in a normal state. The transmission signal is output from the transmission circuit 13 of the service transmission unit 10 to the partner station (A side) through the switch 2 and the transmission path 7. At this time, the reception circuit 21 and the transmission circuit 23 of the standby transmission unit 20 are not operating.

Here, when an abnormality occurs in the service transmission unit 10, the switches 1 and 2 for system switching are switched from the service transmission unit 10 to the standby system transmission unit 20, and the standby system before the occurrence of the abnormality is switched. The system transmission unit 20 is connected to the partner station (A side) to start transmission via the transmission path 7.

[0005]

By the way, in the multiplex transmission system shown in FIG. 10, since the diagnosis of the transmission / reception circuit 23 of the standby transmission unit 20 is not sufficient, an abnormality occurs in the service transmission unit 10. When switching to the standby transmission unit 20, normal transmission may not be possible.

Accordingly, an object of the present invention is to provide a transmission system having a function of diagnosing transmission / reception means of a standby transmission unit in advance.

[0007]

According to a first aspect of the present invention, there is provided a service transmission unit having a transmission means for transmitting data and a reception means for receiving data, and a service system when the service transmission unit fails. Multiplexed transmission devices comprising a transmission unit for transmitting data instead of a transmission unit and a standby transmission unit having a reception unit for receiving data are arranged on one side and the other side and transmitted between the transmission units. In a transmission system that transmits and receives data to and from each other via a channel, each transmission device takes in transmission data from the other party in the receiving means of the regular transmission unit and intercepts transmission data from the other party and waits. An intercepting means for taking in the receiving means of the system transmission unit, and means for comparing received data output from each receiving means and diagnosing the soundness of each receiving means by the comparing means are provided. According to this means, the transmission data from the partner station is intercepted, and the reception data from the reception means of the standby transmission unit and both the reception data from the reception means of the service transmission unit are compared, and the comparison data is used for standby. The soundness of the receiving means of the system transmission unit can be confirmed in advance. As a result, switching from the service transmission unit to the standby transmission unit can be smoothly performed, and the overall reliability of the transmission system can be improved.

According to a second aspect of the present invention, there is provided a service transmission unit having a transmission means for transmitting data and a reception means for receiving data, and a data transmission unit which replaces the service transmission unit when the service transmission unit fails. A transmission device having a multiplex configuration including a transmission unit that transmits data and a standby transmission unit that has a reception unit that receives data is disposed on one side and the other side, and is mutually connected via a transmission path between the transmission devices. In the transmission system for transmitting and receiving data, each standby transmission unit of each transmission device takes in the transmission data output from the transmission unit of the standby transmission unit to the reception unit of the standby transmission unit at a predetermined time. And a switching means for switching the transmission means to diagnose the soundness of the transmission means of the standby transmission section. According to this means, the transmission data output from the transmission unit of the standby transmission unit at the time of the predetermined determination is switched so as to be input to the reception unit of the standby transmission unit, and the soundness of the transmission unit of the standby transmission unit is improved. You can check in advance. As a result, switching from the service transmission unit to the standby transmission unit can be smoothly performed, and the overall reliability of the transmission system can be improved.

According to a third aspect of the present invention, in the transmission system according to the first aspect, the standby transmission unit inputs the transmission data captured from the intercepting means to the reception unit of the standby transmission unit, while determining a predetermined time. Switching means is provided for switching the transmission data from the transmission unit of the standby transmission unit to the reception unit of the standby transmission unit. According to this means, in addition to the effect of the invention of claim 1, switching is performed so that transmission data output from the transmission means of the standby transmission unit at a predetermined determination is input to the reception means of the standby transmission unit. The soundness of the transmission means of the standby transmission unit can be diagnosed in advance. Further, the soundness of the receiving means of the standby transmission unit can be diagnosed. As a result, switching from the service transmission unit to the standby transmission unit can be smoothly performed, and the overall reliability of the transmission system can be improved.

According to a fourth aspect of the present invention, in the transmission system according to the second or third aspect, the switching means attenuates the level of the transmission data from the transmission means of the standby transmission unit by a predetermined amount when the predetermined determination is made. , An attenuating means for inputting to the receiving means of the standby transmission unit. According to this means, in addition to the function of claim 2 or claim 3,
Since the level of transmission data for soundness confirmation is attenuated in anticipation of an actual transmission path or the like and input to the receiving means, the soundness of the transmitting means suitable for actual operation can be accurately determined.

According to a fifth aspect of the present invention, in the transmission system according to the fourth aspect, the attenuating means provided in the switching means is capable of arbitrarily changing the amount of attenuation of transmission data in response to an external request. . According to this means, in addition to the function of claim 4, by varying the level of the transmission data, a diagnosis according to the level of the transmission level can be performed, a detailed diagnosis can be performed, and an accurate diagnosis closer to actual operation can be performed. .

The invention of claim 6 is the invention of claims 3 to 5
In the transmission system described above, the switching unit switches the transmission data from the transmission unit of the standby transmission unit to be input to the reception unit of the standby transmission unit via the hybrid transformer. According to this means, in addition to the functions described in claims 3 to 5, since the hybrid transformer is used for one of the switching means, the reliability can be improved by reducing the number of movable parts.

According to a seventh aspect of the present invention, in the transmission system according to the second aspect, the standby transmission unit receives the transmission data from the transmission unit of the standby transmission unit separately from the reception unit of the standby transmission unit. Receiving means, and checking means for checking the soundness of the transmitting circuit based on a comparison between the received data output from the receiving means and the transmitted data before being input to the transmitting means. The soundness of the transmission means is determined. According to this means, since the transmission data of the standby transmission unit is diagnosed by providing the reception unit and the check unit separately from the reception unit of the standby transmission unit, the soundness of the transmission unit can be always diagnosed.

[0014] The invention of claim 8 is the first to sixth aspects of the present invention.
In any of the transmission systems described above, the receiving unit of the standby transmission unit includes a unit that starts a receiving process after a predetermined time period after the input of the switching signal. According to this means, in addition to the operation according to claims 2 to 6, the soundness of the transmission means of the standby transmission unit is diagnosed after a predetermined time period after the operation of the switching means. Erroneous diagnosis based on the information can be avoided.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a transmission system according to a first embodiment of the present invention. The same reference numerals as those in FIG. 10 showing the prior art indicate the same or corresponding parts.

In FIG. 1, the transmission device corresponds to the transmission device on the B side shown in FIG. 10, and the transmission device includes a service transmission unit 10 and a standby transmission unit 20. The service transmission unit 10 includes a receiving circuit 11 for receiving transmission data from a partner station and outputting received data, and a transmission circuit 13 for transmitting transmission data to the partner station.

The standby transmission unit 20 has the same configuration as that of the regular transmission unit 10, and receives a transmission data of a partner station via a hybrid transformer 3 described later and outputs reception data. And a transmission circuit 23 for transmitting transmission data to the partner station. The receiving circuit 11 of the service transmission unit 10 and the receiving circuit 2 of the standby transmission unit 20
1 is connected to a hybrid transformer 3 and captures transmission data from a partner station so as to intercept the transmission data.
It is configured such that transmission data can be input to both the receiving circuit 11 of the “0” and the receiving circuit 21 of the standby transmission unit 20.

The switch 2 is connected to the output side of the transmission circuit 13 of the service transmission unit 10 and the output side of each transmission circuit 23 of the standby transmission unit 20, and the transmission of the service transmission unit 10 is performed by switching the switch 2. Either the circuit 13 or the transmission circuit 23 of the standby transmission unit 20 is configured to be able to transmit to the partner station.

With the above configuration, transmission data from the partner station is input to the hybrid transformer 3 whose example is shown in FIG.

The hybrid transformer 3 shown in FIG.
Are input coil 3a, branch coil 3b, and branch coil 3
The input signal is transmitted from the input side coil 3a1 to the branch coil 3b, and the input signal is transmitted from the input side coil 3a2 to the branch coil 3c. The hybrid transformer 3 is designed so that the attenuation of the input signal is reduced within a predetermined frequency.

Here, during operation by the service transmission unit 10, the transmission data from the partner station is transmitted by the hybrid transformer 3.
Is input to the receiving circuit 11 of the service transmission unit 10 via
After a predetermined receiving process, the data is output to a data processing device (not shown) as received data. Further, the transmission data is also input from the hybrid transformer 3 to the reception circuit 21 of the standby transmission unit 20, and is output as reception data after a predetermined reception process similarly to the reception circuit 11. And the regular transmission unit 1
The received data of the receiving circuit 11 and the received data of the receiving circuit 21 of the standby transmission unit 20 are input to the comparator 4, and the comparator 4 compares the frames of the received data. Is output.

Thus, when abnormal data is output, it is determined whether the receiving circuit 11 is abnormal or the receiving circuit 21 is abnormal. For example, when the data received from the receiving circuit 11 is determined to be normal by the data processing device and the comparison data is determined to be abnormal, the receiving circuit 21 is determined to be abnormal. In this case, the fact that the receiving circuit 21 is abnormal is notified to the outside, and countermeasures are taken. Even if an abnormality occurs in the receiving circuit 11 of the service transmission unit 10 during that time,
Switching the switch 2 to the standby side and stopping the operation of the standby transmission unit 20 are stopped. On the other hand, when the normal data is output as the comparison data, and when an abnormality with the receiving circuit 11 of the service transmission unit 10 is determined, the switch 2 is switched to the standby side and the standby transmission unit 20 is operated. .

As described above, according to the first embodiment, the transmission data from the partner station is intercepted, and both the reception data from the reception unit of the standby transmission unit and the reception data from the reception unit of the service transmission unit are received. The data is compared with the data, and the soundness of the receiving means of the standby transmission unit can be confirmed in advance by the comparison data. As a result, switching from the service transmission unit to the standby transmission unit can be smoothly performed, and the overall reliability of the transmission system can be improved.

When the data received by both the receiving circuit 11 and the receiving circuit 21 are abnormal, it is determined that the transmission path 7 or the partner station is abnormal.

FIG. 3 is a diagram showing the configuration of a transmission system according to a second embodiment of the present invention. The same reference numerals as those in FIG. 10 showing the prior art indicate the same or corresponding parts.

In FIG. 3, since the transmission device corresponds to the transmission device on the B side shown in FIG. 10, the transmission device includes a service transmission unit 10 and a standby transmission unit 20. The service transmission unit 10 includes a receiving circuit 11 for receiving transmission data from a partner station and outputting received data, and a transmission circuit 13 for transmitting transmission data to the partner station.

The standby transmission unit 20 has the same configuration as the service transmission unit 10. When the operation is switched from the service transmission unit 10 to the standby transmission unit 20, the transmission data of the partner station is switched by the switch 1. And a transmission circuit 23 for transmitting transmission data to a partner station.

The switch 2 is connected to the output side of the transmission circuit 13 of the service transmission section 10 and the output side of each transmission circuit 23 of the standby transmission section 20, and the switching of the switch 2 causes the transmission of the service transmission section 10 to be performed. Either the circuit 13 or the transmission circuit 23 of the standby transmission unit 20 is configured to be able to transmit to the partner station.

Further, the standby transmission unit 20 includes a switch 3
0, and the switch 30 is connected to the regular transmission unit 10.
When operated, the switch 31 connects to the g side, the switch 32 connects to the k side, and the switch 31 connects to the h side and the switch 32 connects to the j side by an external switching signal. To form a folded circuit.

With the above configuration, at the time of a predetermined judgment, or
At the time of system switching, a switching signal is input to the switching unit 30, the switch 31 is switched to the h side, and the switch 32 is switched to the j side. Thus, the transmission data of the specific pattern from the transmission circuit 23 is sent to the h side of the switch 31 via the j side of the switch 32 and input to the reception circuit 21 so that the transmission data of the specific pattern is turned back. The receiving circuit 21 processes the transmission data of the specific pattern and outputs it as reception data, and the reception data is compared with the transmission data by a data processing device (not shown). Thereby, the soundness of the receiving circuit 21 and the transmitting circuit 23 can be confirmed.

As described above, according to the second embodiment, switching is performed so that transmission data output from the transmission circuit of the standby transmission unit is input to the reception circuit of the standby transmission unit at the time of a predetermined determination. The soundness of the transmission circuit and the reception circuit of the transmission unit can be confirmed in advance. As a result, switching from the service transmission unit to the standby transmission unit can be performed smoothly, and the overall reliability of the transmission system can be improved.

FIG. 4 is a diagram showing the configuration of a transmission system according to a third embodiment of the present invention. The same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts.

According to the third embodiment of the present invention, in addition to the first embodiment, a switch 30 is additionally provided in the standby transmission unit 20 so that the transmission circuit 23 and the reception circuit 21 of the standby transmission unit 20 are provided. And to check the soundness. Switch 30 shown
When the switch 31 is connected to the g-side hybrid transformer 3 when operated by the service transmission unit 10,
While the switch 32 is connected to the k side, when a switching signal from the outside is input at a predetermined judgment timing, the switch 3
1 is connected to the h side, and the switch 32 is connected to the j side to form a folded circuit.

In the above configuration, during operation by the service transmission unit 10, transmission data from the partner station is input to the reception circuit 11 of the service transmission unit 10 via the hybrid transformer 3 and received after predetermined reception processing. The data is output to a data processing device (not shown) as data. Further, transmission data is also input from the hybrid transformer 3 to the receiving circuit 21 of the standby transmission unit 20 by the switch 31 of the switch 30,
Like the receiving circuit 11, the data is output as received data after a predetermined receiving process. Then, the received data of the receiving circuit 11 of the service transmission unit 10 and the received data of the receiving circuit 21 of the standby transmission unit 20 are input to the comparator 4, and the comparator 4 compares the received data by frames. Normal or abnormal data is output as data.

Further, at the time of a predetermined judgment, a switching signal is inputted to the switch 30, the switch 31 is switched to the h side, and the switch 32 is switched to the j side. As a result, the transmission data of the specific pattern from the transmission circuit 23 is
2 is sent to the h side of the switch 31 via the j side of the receiving circuit 2
1 is input. The reception circuit 21 processes the transmission data from the transmission circuit 23 and outputs it as reception data. The reception data is compared with transmission data of a specific pattern and reception data by a data processing device (not shown).
It is determined whether the transmission circuit 23 is normal or abnormal.

Thereafter, when it is confirmed that the transmission circuit 23 and the reception circuit 21 are normal, the switch 31 of the switch 30 is switched to connect to the g side and the switch 32 is switched to connect to the k side.

As described above, according to the third embodiment, the first
In addition to the operation of the embodiment, at the time of a predetermined determination, switching is performed so that transmission data output from the transmission circuit of the standby transmission unit is input to the reception circuit of the standby transmission unit. Also, the soundness of the receiving circuit can be confirmed in advance. As a result, switching from the service transmission unit to the standby transmission unit can be smoothly performed, and the overall reliability of the transmission system can be improved.

FIG. 5 is a configuration diagram of a transmission system according to a fourth embodiment of the present invention. The same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts.

In the fourth embodiment of the present invention, in addition to the first embodiment, a switch 30 having an attenuator 33 is additionally provided in the standby transmission unit 20 and the transmission circuit of the standby transmission unit 20 is added. 23
Is to check the soundness of Switch 30 shown
When the switch 31 is connected to the g-side hybrid transformer 3 when operated by the service transmission unit 10,
When the switch 32 is connected to the k-side and an external switching signal is input, the switch 31 is connected to the h-side and the switch 32 is connected to the j-side to form a folding circuit.

The attenuator 33 is provided between the h side of the switch 31 of the switch 30 and the j side of the switch 32, and is used when the other station is far away or when the attenuation of the transmission line 7 is large. The transmission data is attenuated in anticipation of the attenuation.

In the above configuration, during operation by the service transmission unit 10, transmission data from the partner station is input to the reception circuit 11 of the service transmission unit 10 via the hybrid transformer 3 and received after a predetermined reception process. The data is output to a data processing device (not shown) as data. Further, transmission data is also input from the hybrid transformer 3 to the receiving circuit 21 via the switch 31 of the switch 30 of the standby transmission unit 20,
Like the receiving circuit 11, the data is output as received data after a predetermined receiving process. Then, the received data of the receiving circuit 11 of the service transmission unit 10 and the received data of the receiving circuit 21 of the standby transmission unit 20 are input to the comparator 4, and the comparator 4 compares the frames of the received data and compares the comparison data. Is output as normal or abnormal data.

Further, at the time of a predetermined judgment or at the time of system switching, a switching signal is inputted to the switch 30, the switch 31 is switched to the h side, and the switch 32 is switched to the j side. Thereby, the transmission data of the specific pattern from the transmission circuit 23 is attenuated through the j-side of the switch 32 and the attenuator 33 and sent to the h-side of the switch 31.
Is input to In this case, for example, the receivable range is 0 to
The transmission data level is +5 dBm for -40 dBm
And the transmission circuit 23 outputs transmission data.
Further, the attenuator 33 adjusts and fixes the input signal to the receiving circuit 21 so that the signal becomes a receivable level. Receiving circuit 2
In step 1, the transmission data is processed and output as reception data, and the reception data is compared by a data processing device (not shown) to determine whether the transmission circuit 23 is normal or abnormal. Thus, the soundness of the transmission circuit 23 can be determined in consideration of the attenuation of the transmission path 7.

As described above, according to the fourth embodiment, the second
In addition to the operation of the embodiment or the third embodiment, the level of transmission data for soundness confirmation is attenuated in anticipation of an actual transmission path or the like and input to the receiving circuit, so that it can be used immediately in actual operation. The soundness of the transmitted circuit can be accurately determined.

FIG. 6 is a configuration diagram of a transmission system according to a fifth embodiment of the present invention. The same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts.

The fifth embodiment of the present invention is different from the first embodiment in that a variable attenuator 33
The switch 30 having the above configuration is additionally provided to check the soundness of the transmission circuit 23 of the standby transmission unit 20. In the illustrated switch 30, the switch 31 is connected to the g-side hybrid transformer 3 and the switch 32 is connected to the k-side when operated by the service transmission unit 10, and a switching signal from the outside is input. At this time, the switch 31 is connected to the h side, and the switch 32 is connected to the j side to form a folded circuit.

The attenuator 33 is capable of varying the amount of attenuation in response to an external command in order to adjust the amount of attenuation in anticipation of the amount of attenuation in the transmission path 7 or the like.

In the above configuration, during operation by the service transmission unit 10, transmission data from the partner station is input to the reception circuit 11 of the service transmission unit 10 via the hybrid transformer 3 and received after predetermined reception processing. The data is output to a data processing device (not shown) as data. Further, transmission data is also input from the hybrid transformer 3 to the receiving circuit 21 via the switch 31 of the switch 30 of the standby transmission unit 20,
Like the receiving circuit 11, the data is output as received data after a predetermined receiving process. Then, the received data of the receiving circuit 11 of the service transmission unit 10 and the received data of the receiving circuit 21 of the standby transmission unit 20 are input to the comparator 4, and the comparator 4 compares the frames of the received data and compares the comparison data. Is output as normal or abnormal data.

Further, at the time of a predetermined judgment or at the time of system switching, a switching signal is input to the switch 30 and the switch 3
1 is switched to the h side, and the switch 32 is switched to the j side. As a result, the transmission data of a specific pattern from the transmission circuit 23 can be changed via the j
Is input to The attenuator 33 attenuates the input transmission data and outputs the data to the h side of the switch 31. The transmission data sent to the h side of the switch 31 is input to the reception circuit 21. The reception circuit 21 processes the transmission data and outputs it as reception data, and the reception data is compared by a data processing device (not shown) to determine whether the transmission circuit 23 is normal or abnormal.

In this case, the amount of attenuation of the attenuator 33 can be changed in two stages according to a command from the command. For example, if the receivable range of the receiving circuit 21 is 0 to -40 dBm and the transmission data level is +5 dBm, first,
First, the attenuator 33 is caused to have an attenuation of 5 dBm by a command. Thus, the soundness of the reception circuit 21 at the reception level of 0 dBm is diagnosed. Next, if the attenuation of the attenuator 33 is set to 45 dBm by a command, the soundness of the reception level of -40 dBm is diagnosed. As a result, diagnosis of 0 dBm and −40 dBm at both ends of the receivable range can be performed.

As described above, according to the fifth embodiment, the fourth embodiment
In addition to the operation of the embodiment, since the level of the transmission data can be changed, an accurate diagnosis closer to the actual operation can be performed.

FIG. 7 is a block diagram of a transmission system according to the sixth embodiment of the present invention. The same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts.

According to the sixth embodiment of the present invention, in addition to the first embodiment, a switch 30A having an attenuator 33 is additionally provided in the standby transmission unit 20, and the transmission circuit of the standby transmission unit 20 is provided. 2
3 to confirm the soundness. Switch 30 shown
A has a hybrid transformer 8 and an attenuator 33, and is operated by the switch 3 when operated by the service transmission unit 10.
While 1 is connected to the g-side hybrid transformer 3 side,
When an external switching signal is input, the switch 31
And a return circuit that allows the transmission data of the transmission circuit 23 to be input to the h side of the switch 31 via the hybrid transformer 8 and the attenuator 33.

In the above configuration, during operation by the service transmission unit 10, transmission data from the partner station is input to the reception circuit 11 of the service transmission unit 10 via the hybrid transformer 3 and is received after predetermined reception processing. The data is output to a data processing device (not shown) as data. Further, the transmission data is also input from the hybrid transformer 3 to the reception circuit 21 of the standby transmission unit 20 by the switch 31 of the switch 30A, and is output as the reception data after a predetermined reception process like the reception circuit 11. Then, the reception data of the reception circuit 11 of the service transmission unit 10 and the reception circuit 2 of the standby transmission unit 20
The received data is input to the comparator 4, and the comparator 4 compares the frames of the received data, and outputs normal or abnormal data as the comparison data.

Further, at the time of a predetermined judgment or at the time of system switching, a switching signal is input to the switch 30A, and the switch 31 is switched to the h side. Thereby, the transmission circuit 23
Is transmitted to the hybrid transformer 8. The hybrid transformer 8 branches from the input side and switches 2
At the same time, the signal is branched and the transmission data is sent to the h side of the switch 31 via the attenuator 33 and input to the reception circuit 21. The reception circuit 21 processes the transmission data and outputs it as reception data, and the reception data is compared by a data processing device (not shown) to determine whether the transmission circuit 23 is normal or abnormal.

As described above, according to the sixth embodiment, the third
In addition to the operation of the fifth to fifth embodiments, a hybrid transformer is used for one of the switches, so that reliability can be improved by reducing the number of movable parts.

FIG. 8 is a configuration diagram of a transmission system according to the seventh embodiment of the present invention. The same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts.

The seventh embodiment of the present invention is different from the first embodiment in that a reception circuit 21 for inputting transmission data of a transmission circuit 23 to a standby transmission unit 20, another reception circuit 22, and a check circuit 24 Are added to check the soundness of the transmission circuit 23 of the standby transmission unit 20.

Here, the receiving circuit 22 has a configuration similar to that of the receiving circuit 21, and receives the transmission data from the transmission circuit 23 and outputs it as reception data after predetermined processing. The check circuit 24 receives the data received from the reception circuit 22 and the data before output to the transmission circuit 23 and determines whether the transmission circuit 23 is normal or abnormal.

In the above configuration, during operation by the service transmission unit 10, transmission data from the partner station is input to the reception circuit 11 of the service transmission unit 10 via the hybrid transformer 3 and received after predetermined reception processing. The data is output to a data processing device (not shown) as data. Further, the transmission data is also input from the hybrid transformer 3 to the reception circuit 21 of the standby transmission unit 20, and is output as reception data after a predetermined reception process similarly to the reception circuit 11. Then, the reception data of the receiving circuit 11 of the service transmission unit 10 and the standby transmission unit 2
The received data of the receiving circuit 21 of 0 is input to the comparator 4, and the comparator 4 compares the frames of the received data and outputs normal or abnormal data as the comparison data.

On the other hand, the transmission data from the transmission circuit 23 is always transmitted to the reception circuit 22 of the standby transmission section 20.
2 has been output. Next, the transmission data is transmitted to the receiving circuit 22.
The received data is input to the check circuit 24. Further, the check circuit 24 determines whether or not the transmission data from the transmission circuit 23 is abnormal, and outputs the result.

That is, the check circuit 24 compares the transmission data before being input to the transmission circuit 23 with the output data from the reception circuit 22. If they match, it is determined that the data is normal. .

As described above, according to the seventh embodiment, the receiving circuit and the check circuit are provided separately from the receiving circuit of the standby transmission unit, and the transmission circuit of the standby transmission unit is diagnosed. Diagnosis of circuit soundness.

FIG. 9 is a configuration diagram of a transmission system according to the eighth embodiment of the present invention. The same reference numerals as in FIG. 3 showing the second embodiment denote the same or corresponding parts.

The eighth embodiment of the present invention is different from the third embodiment in that a timer 2 for determining the start of operation of the receiving circuit 21 is used.
5 is additionally provided. The timer 25 connects the switch 31 of the switch 30 to the h side by the switching signal,
The timer starts when the switch 32 is connected to the j side, and outputs an operation start signal to the receiving circuit 21 when the timer counts up to start the receiving process of the receiving circuit 21.

With the above configuration, at the time of a predetermined judgment, or
At the time of system switching, a switching signal is input to the switch 30, the switch 31 is switched to the h side, and the switch 32 is switched to the j side. In this case, the timer 25 starts counting the timer in synchronization with the switching signal, and a receiving process start command is output to the receiving circuit 21 after a predetermined time period. Thereby, the transmission circuit 2
The transmission data from 3 is sent to the h side of the switch 31 via the j side of the switch 32 and input to the receiving circuit 21. The reception circuit 21 processes the transmission data and outputs it as reception data, and the reception data is compared by a data processing device (not shown) to determine whether the transmission circuit 23 is normal or abnormal.

In this case, immediately after the switching by the switch 30, if the receiving circuit 21 receives and processes the input transmission data immediately, the reception abnormality is diagnosed due to the operation delay of the switches 31 and 32 and chattering. In some cases, such erroneous diagnosis can be avoided, and erroneous diagnosis notification can be avoided.

As described above, according to the eighth embodiment, the second
In addition to the operation of the sixth to sixth embodiments, the reception circuit 2 of the standby transmission unit is provided after a predetermined time period after the operation of the switch.
Since the diagnosis of the soundness of the transmission circuit 23 is performed by using 1, the erroneous diagnosis based on the erroneous transmission data can be avoided.

[0069]

As described above, according to the first aspect of the present invention, the data received from the receiving means of the standby transmission unit is compared with the data received from both the receiving means of the service transmission unit. Since the soundness of the receiving means of the standby transmission unit can be diagnosed in advance by the data, the switching from the service transmission unit to the standby transmission unit can be smoothly performed, and the overall reliability of the transmission system can be improved.

According to the second aspect of the present invention, the transmission data output from the transmission unit of the standby transmission unit at the time of the predetermined determination is switched to be input to the reception unit of the standby transmission unit.
Since the soundness of the transmission means of the standby transmission unit can be diagnosed in advance, switching from the service transmission unit to the standby transmission unit can be smoothly performed, and the overall reliability of the transmission system can be improved.

According to the third aspect of the present invention, the first aspect
In addition to the operation of the invention, the soundness of the transmission unit of the standby transmission unit is switched by switching the transmission data output from the transmission unit of the standby transmission unit to the reception unit of the standby transmission unit at the time of the predetermined determination. Is diagnosed in advance, the switching from the service transmission unit to the standby transmission unit can be smoothly performed, and the overall reliability of the transmission system can be improved.

Further, according to the invention of claim 4, according to claim 2,
Alternatively, in addition to the function of claim 3, the level of the transmission data for soundness confirmation is attenuated in anticipation of an actual transmission path or the like and input to the reception means, so that the soundness of the transmission means conforming to actual operation Sex can be accurately determined.

According to the invention of claim 5, according to claim 4,
In addition to the above operation, by varying the level of the transmission data, it is possible to make a diagnosis according to the transmission level, and to perform a detailed diagnosis, thereby making it possible to perform an accurate diagnosis closer to the actual operation.

According to the invention of claim 6, according to claim 3,
In addition to the functions described in the fifth aspect, since the hybrid transformer is used as one of the switching means, the reliability can be improved by reducing the number of movable parts.

According to the seventh aspect of the present invention, the transmission data of the standby transmission unit is diagnosed by providing the reception unit and the check unit separately from the reception unit of the standby transmission unit. Can diagnose the soundness of

Further, according to the invention of claim 8, claim 2
In addition to the effects described in the sixth aspect, the soundness of the transmission unit of the standby transmission unit is diagnosed after a predetermined time period after the operation of the switching unit, so that an erroneous diagnosis based on erroneous transmission data can be avoided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a transmission system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating an example of a hybrid transformer provided in the transmission system of FIG. 1;

FIG. 3 is a configuration diagram of a transmission system according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a transmission system according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a transmission system according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of a transmission system according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram of a transmission system according to a sixth embodiment of the present invention.

FIG. 8 is a configuration diagram of a transmission system according to a seventh embodiment of the present invention.

FIG. 9 is a configuration diagram of a transmission system according to an eighth embodiment of the present invention.

FIG. 10 is a configuration diagram showing a conventional transmission system.

[Explanation of symbols]

 1, 2, 31, 32 switch 3, 8 hybrid transformer 7 transmission line 10 service transmission unit 11, 21, 22 reception circuit 13, 23 transmission circuit 20 standby transmission unit 24 check circuit 25 timer 30 switch 33 attenuator

Claims (8)

[Claims] 1. A service transmission unit having transmission means for transmitting data and reception means for receiving data, and transmission for transmitting data in place of the service transmission unit when the service transmission unit fails. Means and a standby transmission unit having a receiving means for receiving data, multiplexed transmission devices are arranged on one side and the other side, and data transmission and reception are mutually performed between the transmission devices via a transmission path. In the transmission system to be performed, each of the transmission devices takes in transmission data from the other party to the receiving unit of the regular transmission unit, and intercepts the transmission data from the other party to the receiving unit of the standby transmission unit. A transmission system comprising: an intercepting unit that captures data; and a unit that compares received data output from each of the receiving units and diagnoses the soundness of each receiving unit. 2. A service transmission unit having transmission means for transmitting data and reception means for receiving data, and transmission for transmitting data in place of the service transmission unit when the service transmission unit fails. Means and a standby transmission unit having a receiving means for receiving data, multiplexed transmission devices are arranged on one side and the other side, and data transmission and reception are mutually performed between the transmission devices via a transmission path. In the transmission system to be performed, each standby transmission unit of each transmission device, at a predetermined determination,
Switching means for switching the transmission data output from the transmission means of the standby transmission unit to be taken into the reception means of the standby transmission unit is provided, and diagnosing the soundness of the transmission means of the standby transmission unit. Transmission system. 3. The standby transmission unit inputs the transmission data received from the interception unit to the reception unit of the standby transmission unit, and transmits the transmission data from the transmission unit of the standby transmission unit at a predetermined time. 2. A transmission system according to claim 1, further comprising: a switching unit for switching the reception unit of the standby transmission unit so as to take in the standby unit, and diagnosing the soundness of the transmission unit and the reception unit of the standby transmission unit. . 4. The switching means includes an attenuating means for attenuating a level of transmission data from the transmitting means of the standby transmission unit by a predetermined amount upon predetermined determination and inputting the level to the receiving means of the standby transmission unit. The transmission system according to claim 2 or 3, wherein 5. The transmission system according to claim 4, wherein said attenuating means provided in said switching means is capable of arbitrarily changing the amount of attenuation of transmission data in response to an external request. 6. The switching unit according to claim 3, wherein the switching unit switches the transmission data from the transmission unit of the standby transmission unit to be input to the reception unit of the standby transmission unit via the hybrid transformer. Item 6. The transmission system according to any one of Items 5. 7. The standby transmission unit includes a reception unit for checking to receive transmission data from a transmission unit of the standby transmission unit separately from the reception unit of the standby transmission unit, and an output from the reception unit. Checking means for checking the soundness of the transmission circuit based on a comparison between the reception data and the transmission data before output to the transmission means, and determining the soundness of the transmission means of the standby transmission unit. Claim 2
Transmission system as described. 8. The receiver according to claim 1, wherein the receiving unit of the standby transmission unit includes a unit that starts a receiving process after a predetermined time period after the input of the switching signal. Transmission system.