JPH08256158A - Multipath transmission equipment - Google Patents

Abstract

PURPOSE: To transmit signals through plural fixed routes regardless of frequent occurrence of external noise by providing a discriminating means with a repeating node between a transmission node and a reception node to discriminate a fixed-length signal. CONSTITUTION: The input signal from a communication terminal 100 is divided into fixed-length signals by a header addinq device 201, and divided signals are copied and transmitted to plural transmission routes. Information of the destination and the reception terminal are inputted from the transmission terminal 100 and are supplied to a channel control circuit 501. The circuit 501 sends transmission information between transmission and reception to a first controller 611 and extracts connection information based on transmission information from a route storage device 621 in the priority order and controls a first transmission line switch circuit 601. Then, call control is independently performed between the transmission node and the repeating node or the reception node, and the device 611 takes out next priority information from the device 621 to set a call in the case of a fault, and it is copied by a copy circuit 401 and is supplied to the circuit 601 and is supplied to the set and connected transmission line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-path transmission device relating to a transmission system in which a transmission node and a reception node for transmitting and receiving signals are provided with a plurality of physical transmission lines, and more particularly to a plurality of physical transmission lines. The same signal is duplicated and transmitted on the route, the receiving node identifies and receives the plurality of signals, the signal error is detected, and a signal without error is selected and received, which is excellent in reliability. The present invention relates to a multipath transmission device.

[0002]

2. Description of the Related Art Conventionally, a protection line is prepared in addition to a normally used working line, the same signal is transmitted to a plurality of these transmission lines, and a delay of the transmitted signal at the receiving side,
A means of performing bit matching or the like and switching to a transmission line having a good transmission quality has been adopted. FIG. 9 shows an embodiment relating to a conventional receiving end switching transmission system disclosed in, for example, Japanese Patent Laid-Open No. 4-54738.

Next, the operation of this conventional example will be described.
The signals distributed by the cross connect device 10 are transmitted from the transmitters of the terminal stations 11 and 12 to the optical fiber transmission lines L1 and L.
Dispatched to 2. The signals input to the receiving units 22 and 32 of the receiving terminal device are temporarily stored in the memories 24 and 34, respectively, and the delay time difference between the signals transmitted through the transmission lines L1 and L2, noise information such as jitter, etc. It is absorbed and input to the changeover switch 60 in a state of being synchronized with each other.
Then, the signal selected by the changeover switch 60 is supplied to the cross-connect device 80.

The changeover control circuit 70 determines the changeover operation of the changeover switch 60 based on the monitoring information such as the transmission quality of the transmission lines L1 and L2 and the fault condition. Further, the monitoring circuits 23 and 33 detect an abnormal state such as a signal break in the transmission lines L1 and L2, measure an error rate by a parity check or the like, and output the error rate to the switching control circuit 70.

[0005]

Therefore, in the conventional transmission method, the transmission line switching on the receiving side is to switch to the protection line due to a failure or quality deterioration of the working line, but the switching procedure is simple. The transmission and reception signal interruption time is shortened. However, if the quality of the switched backup line also deteriorates, reliable transmission cannot be performed unless a new backup line is prepared. Therefore, a large number of backup lines are prepared, and signals are transmitted in parallel. There were problems in terms of cost and maintainability.

The present invention solves the above problems.
Even in the case of line failure and deterioration of transmission quality in an environment where external noise frequently occurs, it is possible to always perform signal transmission of a certain number of multiple paths, and in principle, eliminate the detour time at the time of line failure, An object of the present invention is to provide a highly reliable multi-path transmission device capable of reducing retransmissions.

[0007]

In order to solve the above problems, a multipath transmission apparatus according to claim 1 of the present invention has a plurality of physical transmission paths for a transmission node and a reception node for transmitting and receiving signals. In a multi-path transmission device relating to a transmission system provided, on the transmitting node side, dividing means for dividing a continuous signal into fixed-length signals, and a signal divided by the dividing means for a plurality of transmission paths is duplicated. The receiving node side is provided with first identifying means for identifying a fixed-length signal and error detecting means for temporarily accumulating the signal and performing error detection of the signal. However, the relay node between the transmitting node and the receiving node is configured to include second identifying means for identifying a fixed-length signal.

A multipath transmission apparatus according to a second aspect of the present invention is the multipath transmission apparatus according to the first aspect, wherein the dividing means on the transmission node side includes a first memory for temporarily storing a signal. And a header adding unit that divides the signal stored in the first memory into fixed lengths and adds a header including a transmission sequence number and an error detection code, and the transmitting unit on the transmitting node side is divided into the divided units. And a first switch for connecting a signal transmission path, and a first control unit for controlling the first switch.

A multipath transmission apparatus according to claim 3 of the present invention is the multipath transmission apparatus according to claim 1 or 2, wherein the first identifying means on the receiving node side connects a path for transmitting a signal. And a second control means for controlling the second switch, wherein the error detection means on the receiving node side analyzes the header portion of the fixed-length signal and discards a duplicate signal, It is configured by including a first header analyzing means for performing signal order check and error detection, and a second memory for temporarily storing the signal.

A multipath transmission device according to a fourth aspect of the present invention is the multipath transmission device according to the first, second or third aspect, wherein the second identification means of the relay node is a route for transmitting a signal. A third switch for connection, a third control means for controlling the third switch, and a second header analysis means for analyzing the header portion of the transmitted fixed-length signal and only discarding duplicate signals. It is equipped and configured.

Furthermore, the multi-route transmission apparatus according to claim 5 of the present invention is the multi-route transmission apparatus according to claim 1, 2, 3 or 4, wherein the receiving node side has an error in the received signal and the same error. Monitoring means for monitoring the line quality and line status based on the difference in signal reception time, and for releasing the call from the receiving node side of the transmission route depending on the deterioration state of the monitored object, and for urging the sending node side to reset the call. It is equipped and configured.

[0012]

In the multipath transmission apparatus according to claim 1 of the present invention,
On the transmitting node side, the continuous signal is divided into fixed-length signals by the dividing means, and the signals divided by the dividing means are duplicated by the transmitting means and transmitted to a plurality of transmission paths. Means that the first identifying means identifies a fixed-length signal and temporarily stores the signal, and the error detecting means performs error detection of the signal. Further, in the relay node between the transmitting node and the receiving node, ,
The second identifying means identifies the fixed-length signal.

That is, on the transmitting node side, a continuous signal is divided into fixed lengths according to the route table and is sent with a header added, and on the receiving node side, signals arriving on each transmission route are sent. Is temporarily stored in the memory device and the signal is analyzed and discarded. At this time, if an error is detected in the signal, it waits for the reception of the duplicated signal of the last arrival.

Therefore, in the multipath transmission apparatus according to the first aspect of the present invention, the error detection of the signal by the different transmission path is performed on the receiving node side, and even if the first arrival signal is incorrect, the second arrival signal interpolates the signal. Therefore, it is possible to perform transmission / reception without waiting for the retransmission of the signal of the transmitting node, and it is possible to perform highly reliable signal transmission.

Further, in the multipath transmission apparatus according to claim 2 of the present invention, the dividing means on the transmitting node side temporarily stores the signal in the first memory and stores the signal stored in the first memory as a header. The adding means divides the fixed length signal into a fixed length, adds a header including a transmission sequence number and an error detection code, and in the transmitting means on the transmitting node side, the divided fixed length signal is duplicated by the duplicating means to perform the first control. Under the control of the means, the path for transmitting the signal is connected by the first switch.

Further, in the multipath transmission apparatus according to claim 3 of the present invention, the first identification means on the receiving node side has the second
Under the control of the control means, the path for transmitting the signal is connected by the second switch, and in the error detection means on the receiving node side, the first header analysis means analyzes the header part of the fixed-length signal and duplicates it. Signals are discarded, signal ordering is checked, and errors are detected, and the signals are temporarily stored in the second memory.

With the combination of the multipath transmission devices according to claims 2 and 3 of the present invention, the signal is divided into fixed lengths at the transmission node, the signal is duplicated and sent to the transmission line, and these signals are received at the reception node. It is possible to realize a multi-route transmission device that performs transmission on a redundant route and is provided with a means for identifying, and thus it is possible to perform transmission of a signal with extremely high reliability and high resistance. As a result, it is possible to always carry out signal transmission of a certain number of multiple paths even if a line failure or transmission quality deterioration occurs in an environment where external noise frequently occurs, and in principle, the detour time at the time of line failure is eliminated. Thus, it is possible to realize a highly reliable multipath transmission device capable of reducing the number of signal retransmissions.

Further, in the multipath transmission device according to claim 4 of the present invention, in the second identification means of the relay node, the path for transmitting the signal is connected by the third switch under the control of the third control means. The second header analysis means analyzes the header part of the transmitted fixed-length signal and discards only the duplicated signal. In this way, the relay node also analyzes the header and discards the duplicate signal, so that the traffic on the transmission path between the nodes can be reduced.

Further, in the multipath transmission apparatus according to claim 5 of the present invention, on the receiving node side, the monitoring means monitors the line quality and the line state based on the error of the received signal and the reception time difference of the same signal. Depending on the deterioration state of the monitoring target, the receiving node side releases the call on the transmission path and prompts the transmitting node side to reset the call. This makes it possible to transmit a signal with extremely high reliability and high resistance.

[0020]

Embodiments of the present invention will now be described with reference to the drawings. Example 1. FIG. 1 shows a block diagram of a transmitting node side in a multipath transmission apparatus according to a first embodiment of the present invention.

In the figure, the transmitting node side in the multipath transmission apparatus of this embodiment is a transmitting terminal 100, a header adding device (header adding means in the claims) 201, a first
Memory device (first memory) 301, copy circuit (duplicating means) 401, speech path control circuit 501, first transmission path switch circuit (first switch) 601, first control device (first control means) 611, route storage It is configured to include a device 621.

The dividing means on the transmitting node side in the claims is the header adding device 201 and the first memory device 301, and the transmitting means on the transmitting node side is the copy circuit 401 and the first transmission line switch. The circuit 601 and the first control device 611.

The first memory device 301 temporarily stores a signal to be transmitted. The header addition device 201 divides the signal accumulated in the first memory device 301 into fixed lengths, and adds a header including a transmission sequence number and an error detection code.
In addition, the copy circuit 401 duplicates the signal input from the header addition device 201 to copy the first transmission path switch circuit 60.
Send to 1 in parallel. The communication path control circuit 501 is a device that sets a signal transmission path.

The first transmission path switch circuit 601 performs switching for sending out the duplicated signal to various transmission paths, and the first control device 611 controls the first transmission path switch circuit 601 to send it. It is a device that controls the transmission path to be output. The route storage device 621 is a device that stores connection information for all transmission paths between various terminals.

Upon receiving the transmission information between the transmission / reception terminals from the communication path control circuit 501, the first control device 611 retrieves the connection information between the corresponding terminals from the route storage device 621,
The first transmission path switch circuit 601 is controlled based on the information.

The input signal from the transmitting terminal 100 is
The header adding device 201 divides the signal into fixed-length signals, the format of which is shown in FIG. That is, it is configured to include a flag, a transmission sequence number, a reception sequence number, an error detection bit, and data. At the time of transmission, a transmission sequence number, a reception sequence number and an error detection bit are set and transmitted.

Next, the operation of this embodiment will be described. First, information on the other party and the receiving terminal, such as a terminal number, is input from the transmitting terminal 100, and the input signal is supplied to the speech path control circuit 501. The communication path control circuit 501 sends the transmission information between the transmitting and receiving terminals, such as the transmitting and receiving terminal number and the number of transmission routes, to the first control device 611. In the first control device 611, the connection information based on the transmission information is extracted from the route storage device 621 in descending order of priority,
The first transmission path switch circuit 601 is controlled.

The call control between the transmitting node and the relay node or the receiving node is performed by the individual signal system, and when a failure is detected during the call setting, the first control device 611 moves from the route storage device 621 to the next. Information with high priority is retrieved and call setup is performed.

If the transmission route can be secured, the transmitting terminal 100
Send the signal from. The signal is temporarily stored in the first memory device 3
01, and the header addition device 201 divides the accumulated signal into fixed-length signals, adds a header, and sends the signal. At this time, the signal to be transmitted is a divided signal as shown in FIG. 2, and even if the signal is less than the fixed length, a vacant area is set and transmitted. Further, the copy circuit 401 copies the divided signal by the amount of the transmission path, supplies it to the first transmission path switch circuit 601, and outputs it to the transmission path connected by setting.

Example 2. FIG. 3 shows a block diagram of the receiving node side in the multipath transmission apparatus according to the second embodiment of the present invention.
In the figure, the receiving node side in the multipath transmission apparatus of this embodiment is a second transmission line switch circuit (second switch).
602, a second control device (second control means) 612, a first header analysis device (first header analysis means) 202, a second memory device (second memory) 302, and a receiving terminal 101.

The first identifying means on the receiving node side referred to in the claims is the second transmission line switch circuit 602 and the second control device 612, and the error detecting means on the receiving node side is the first header. Analysis device 202 and second memory device 3
02.

The second transmission path switch circuit 602 connects a path for transmitting a signal, and the second control device 612 operates the second transmission path switch circuit 602.
This is a device that controls the transmission path switch circuit 602 to control the transmission path to be received.

The first header analysis device 202 temporarily receives a signal received from a different transmission path from the second memory device 30.
This is a device for analyzing the header portion of each fixed-length signal, discarding the duplicated signal, checking the order of the signals, and detecting an error after the data is stored in 2. The second memory device 302 is used not only for temporary storage of signals, but also when the reception order becomes incorrect.
The signal is accumulated for a certain period of time.

Next, the operation of this embodiment will be described.
It is assumed that the transmission route has already been set by the transmitting terminal 100. Therefore, the signal received from the transmission line is
It is temporarily stored in the second memory device 302 through the transmission path switch circuit 602.

The first header analysis device 202 analyzes the header portion of the accumulated fixed-length signal. The order of the signals is confirmed by the transmission order number, and bit error detection of the signals is performed by the error detection bits. At this time, if it is determined that the signal reception order is incorrect, the signals are accumulated while performing header analysis of the next signal for a certain period of time. If the order cannot be corrected by the late arrival signal, the signal is sent to the receiving terminal 101 as it is. When an error is detected by detecting an error in a signal, the signal is accumulated and the correct reception of the last arrival is waited for a certain time. If the correct signal arrives later, that signal is discarded. Otherwise, the erroneous signal is sent to the receiving terminal 101.

As described above, by configuring the multipath transmission apparatus by the combination of the transmission node of the first embodiment and the reception node of the second embodiment, the error detection of the signal by the different transmission paths is performed on the reception node side, and the first arrival Even if the signal is wrong, the signal can be interpolated by the later-arriving signal, and the signal can be transmitted and received without waiting for the retransmission of the signal of the transmitting node, which enables highly reliable signal transmission. A route transmission device can be realized.

Example 3. In the above-described first and second embodiments, the configuration of the multipath transmission device that performs one-to-one unidirectional communication has been shown. Below, the configuration of two-way communication is shown. FIG.
It is a block diagram of the multi-route transmission apparatus which concerns on Example 3 of this invention.

In FIG. 4, the multipath transmission apparatus of the present embodiment includes a transmission / reception terminal 103, a header processing device (header addition means / first header analysis means) 203, and a first memory device (first memory / second memory). 303, buffer circuit (replicating means) 402, speech path control circuit 501, first transmission path switch circuit (first switch / second switch) 601, first control device (first control means / second control means) 611, The route storage device 621 is provided.

The transmitting / receiving terminal 103 basically performs processing by separating the configuration of the first transmission path switch 601 from the transmitting / receiving terminal 103 into a transmitting side and a receiving side. The header processing device 203 is a combination of the header adding device 201 of the first embodiment and the first header analyzing device 202 of the second embodiment, which adds a header to a transmission signal and a header to a reception signal. Analysis of.

The first memory device 303 is internally divided into a transmitting side and a receiving side, and is used in each area. Similarly, in the buffer circuit 402, the inside is divided into two parts, the transmitting side copies the signal, and the receiving side operates as a queue buffer. In addition, the same thing as the first embodiment is applied to the communication path control device 501, the first transmission path switch circuit 601, the first control device 611, and the route storage device 621.

Next, the operation of this embodiment will be described.
First, when functioning as a transmission side, the other party's terminal number information is transmitted to the communication path control device 501, and a plurality of different transmission routes are set. If the transmission path can be secured, the transmitting / receiving terminal 103
Then, the header processing device 203 adds a header, the buffer circuit 402 copies the signal, and sends it to the transmission path.

Even when functioning as the receiving side, the signal received from the transmission line is supplied to the header processing device 203 through the buffer circuit 402, and the header processing device 20 is supplied.
3, the header is analyzed and sent to the transmitting / receiving terminal 103. The sequence control and error detection are the same as those in the second embodiment.

Example 4. Further, by monitoring the transmission line at the receiving end, detecting the deterioration of the transmission quality or disconnection of the line and releasing the defective transmission line at the receiving end, it is possible to prompt the resetting of the transmission line. The present embodiment is an example of the apparatus configuration in that case.

FIG. 5 is a block diagram of the receiving node side in the multipath transmission apparatus according to the fourth embodiment of the present invention. In the figure, the receiving node side in the multipath transmission apparatus of the present embodiment is the receiving terminal 101, the first header analyzing apparatus 202, the second
The memory device 302, the second transmission path switch circuit 602, the second control device 612, and the monitoring device (monitoring means) 701 are provided.

Receiving terminal 101, first header analysis device 20
2, second memory device 302, second transmission line switch circuit 6
02, the second control device 612 is the same as that of the second embodiment.

The monitoring device 701 monitors the line quality and line state based on the error of the received signal and the reception time difference of the same signal, and releases the call of the transmission route from the receiving node side depending on the deterioration state of the monitored object. It prompts the sending node to reset the call.Specifically, it monitors the transmission quality and line status of the transmission path used for signal transmission, and based on deterioration of quality and failure of line disconnection, The second controller 612 is instructed to disconnect the transmission path.

Therefore, the disconnection of the call is notified to the transmitting side by the individual signal system call control, and the transmitting side sets the transmission path again. The call setup procedure is the same as the call setup procedure of the first embodiment. This enables multipath signal transmission at all times.

Example 5. In the first and third embodiments, the fixed length signal to be transmitted is duplicated by the copy circuit 401 or the buffer circuit 402, but it can be realized by the switch control of the first transmission line switch circuit 601. The present embodiment is an example of the apparatus configuration in that case.

FIG. 6 is a block diagram of the transmitting node side in the multipath transmission apparatus according to the fifth embodiment of the present invention. In the figure, the transmission terminal 100, the header addition device 201, the first memory device 301, the first transmission path switch circuit 601, and the first
As the control device 611, the same device as that in the first embodiment is applied. The connect storage device 631 stores which node or terminal the input / output line of the first transmission path switch circuit 601 is connected to.

Next, the operation of this embodiment will be described. First, the first control device 611, which has received the information between the transmission / reception terminals from the transmission terminal 100, knows the switching position from the connection storage device 631, and the first transmission path switch circuit 6
The switching control is performed on 01.

For example, when transmitting data to three transmission lines L10, L11 and L12, three connection points are provided on the same line so that the signal line from the header addition device 201 is branched into three transmission lines. It should be provided. At the time of call setup between the transmitting and receiving terminals, the transmission route information is sent to the transmission line to switch the relay node.

Example 6. When the multipath transmission device is configured in the fifth embodiment, it is necessary to control switching at the relay node and perform 1 to N relay. The present embodiment is an example of the apparatus configuration in that case.

FIG. 7 is a block diagram of a relay node in a multipath transmission apparatus according to a sixth embodiment of the present invention. In the figure, the relay nodes of the multipath transmission apparatus of this embodiment are the third transmission path switch circuit (third switch) 603, the third control device (third control means) 613, and the connection storage device 632.
It is configured with. For these, the same ones as in the above-described fifth embodiment are applied.

The transmission path information included in the call setting sent from the transmitting node is notified to the third control device 613. Based on this information, the third control device 613 refers to the connect storage device 632 and controls the third transmission line switch circuit 603. For example, the transmission lines L21 and L22 are respectively switched to L31, L22 by the switching of the third transmission line switch circuit 603.
It is sent to L33, L32, and L33.

Embodiment 7 FIG. Based on the sixth embodiment described above, the header analysis is also performed in the relay node and the duplicated data is discarded, so that the traffic on the transmission line between the nodes can be reduced. The present embodiment is an example of the apparatus configuration in that case.

FIG. 8 is a block diagram of a relay node in a multi-route transmission apparatus according to the seventh embodiment of the present invention. In the figure, the relay nodes of the multipath transmission apparatus of this embodiment are the third transmission path switch circuit 603, the third control apparatus 613, and the second control apparatus 613.
A header analysis device (second header analysis means) 204 is provided.

Here, the second identifying means of the relay node referred to in the claims is the third connecting means for connecting a path for transmitting a signal.
A transmission line switch circuit 603, a third control device 613 that controls the third transmission line switch circuit 603, and a second header analysis that analyzes the header portion of the transmitted fixed-length signal and discards only duplicate signals. The device 204.

As the second header analysis device 204, the third transmission line switch circuit 603, and the third control device 613, the same components as in the second embodiment are applied. In the figure, L50 and L51 represent input transmission lines, and L60 represents output transmission lines.

If the signal sent from the transmitting node is included in both the transmission lines L50 and L51, the same signal will flow twice in the transmission line L60 in the ordinary relay, and the traffic will increase. Therefore, in the relay node, the second header analysis device 204 analyzes the header and discards the duplicate data.

The operation of this embodiment is similar to that of the second embodiment, except that the second header analysis device 204 sends the transmission sequence number,
The error detection bit is analyzed and the first-arrival signal is sent to the transmission line L60. At this time, in order to reduce the load on the relay node, even if the transmission order is found to be incorrect, it is sent as it is.

[0061]

As described above, according to the first aspect of the present invention.
According to the multipath transmission device of the above, the transmitting node divides a continuous signal into different fixed lengths according to the route table, adds a header and sends the divided signal, and the receiving node transmits each transmission. The signal arriving on the route is temporarily stored in the memory device, and the signal is analyzed / discarded. At this time, if an error is detected in the signal, it waits to receive the duplicated signal of the last arrival. We decided to perform signal error detection on the receiving node side through different transmission paths and to interpolate the signal with the late arrival signal even if the first arrival signal is incorrect, so we wait for the retransmission of the signal from the transmission node. It is possible to provide a multi-route transmission device that can perform transmission / reception without any need and can perform highly reliable signal transmission.

Further, in the multipath transmission apparatus according to claim 2 of the present invention, the dividing means on the transmitting node side temporarily stores the signal in the first memory and stores the signal stored in the first memory as a header. The adding means divides the fixed length signal into a fixed length, adds a header including a transmission sequence number and an error detection code, and in the transmitting means on the transmitting node side, the divided fixed length signal is duplicated by the duplicating means to perform the first control. Under the control of the means, the path for transmitting the signal is connected by the first switch, and in the multipath transmission device according to claim 3 of the present invention, the first identification means on the receiving node side is the second
Under the control of the control means, the path for transmitting the signal is connected by the second switch, and in the error detection means on the receiving node side, the first header analysis means analyzes the header part of the fixed-length signal and duplicates it. Since the signals are discarded, the order of the signals is checked, and the errors are detected, and the signals are temporarily stored in the second memory, the combination of the multipath transmission devices according to claims 2 and 3 of the present invention enables It is possible to realize a multi-path transmission device that divides a signal into fixed lengths at a transmission node, duplicates the signal, sends it out to a transmission line, and has a means for identifying these signals at a reception node for transmission on a redundant path. As a result, it is possible to always carry out signal transmission through a certain number of routes even in the case of line failure and deterioration of transmission quality in an environment where external noise frequently occurs, and in principle, the detour time at the time of line failure is reduced. Nothing And, it is possible to provide a highly capable reliability and anti phlegm of reducing the retransmission signal multipath transmission device.

Further, according to the multipath transmission device of the fourth aspect of the present invention, in the second identification means of the relay node, under the control of the third control means, the connection of the path for transmitting the signal by the third switch is connected. Since the second header analysis means analyzes the header portion of the transmitted fixed-length signal and discards only the duplicated signal, it is possible to reduce the traffic on the transmission path between the nodes. .

Further, according to the multipath transmission apparatus of the fifth aspect of the present invention, on the receiving node side, the monitoring means determines the line quality and the line state based on the error of the received signal and the reception time difference of the same signal. Monitoring, and depending on the deterioration state of the monitored object, the receiving node side releases the call on the transmission path,
Since it is urged to reset the call to the transmitting node side, it is possible to transmit a signal with extremely high reliability and resistance.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a transmission node side in a multi-route transmission device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a signal transmission format in the embodiment of the present invention.

FIG. 3 is a configuration diagram of a receiving node side in a multi-route transmission apparatus according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a multi-route transmission device (transmission / reception side) according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a receiving node side in a multipath transmission apparatus according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of a transmission node side in a multi-route transmission device according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram of a relay node in a multi-route transmission apparatus according to a sixth embodiment of the present invention.

FIG. 8 is a configuration diagram of a relay node in a multi-route transmission apparatus according to a seventh embodiment of the present invention.

FIG. 9 is a configuration diagram of a transmission device for explaining a conventional transmission method.

[Explanation of symbols]

100 sending terminal, 101 receiving terminal, 103 sending and receiving terminal, 201 header adding device (header adding means), 2
02 first header analysis device (first header analysis means), 2
03 header processing device, 204 second header analysis device (second header analysis means), 301 first memory device (first memory), 302 second memory device (second memory),
303 first memory device, 401 copy circuit (duplicating means), 402 buffer circuit, 501 speech path control device, 601 first transmission path switch circuit (first switch), 602 second transmission path switch circuit (second switch), 603 Third transmission line switch circuit (third switch), 611 First control device (first control means), 612
Second control device (second control means), 613 Third control device (third control means), 621 Route storage device, 63
1,632 Connected storage device, 701 Monitoring device (monitoring means), L10, L11, L12, L21, L22, L31, L3
2, L33, L50, L51, L60 Transmission line, 10,80 Cross-connect device, 11,12 Terminal station, 22,32 Receiver, 23,33 Monitoring device, 24,34 Memory, 60
Switch, 70 switching control circuit, L1, L2 transmission line.

Claims (5)

[Claims] 1. A multi-path transmission device relating to a transmission system comprising a plurality of physical transmission paths for a transmission node and a reception node for transmitting and receiving signals, wherein a continuous signal is a fixed-length signal on the transmission node side. A first identification for identifying a fixed-length signal on the receiving node side, and a dividing means for dividing the signal into a plurality of transmission paths, and a transmitting means for duplicating and transmitting the signal divided by the dividing means for a plurality of transmission paths. Means and an error detection means for temporarily accumulating a signal and performing error detection of the signal, wherein the relay node between the transmitting node and the receiving node is
A multipath transmission device comprising a second identifying means for identifying a fixed-length signal. 2. The dividing means on the side of the transmitting node divides a signal stored in the first memory into a fixed length and a first memory for temporarily storing the signal, and outputs a transmission sequence number and an error detection code. Header sending means for adding a header including the sending means on the sending node side, the duplicating means for duplicating the divided fixed-length signal, and a first switch for connecting a path for transmitting the signal, The multipath transmission device according to claim 1, further comprising: first control means for controlling the first switch. 3. The first identification means on the receiving node side comprises a second switch for connecting a path for transmitting a signal and a second control means for controlling the second switch. The error detecting means includes a first header analyzing means for analyzing the header portion of the fixed-length signal to discard redundant signals, check the order of the signals, and detect an error, and a second memory for temporarily storing the signal. The multipath transmission device according to claim 1 or 2, further comprising: 4. The second identifying means of the relay node comprises a third switch for connecting a path for transmitting a signal, and the third switch.
3. A third control means for controlling the switch, and a second header analysis means for analyzing the header portion of the transmitted fixed-length signal and only discarding the duplicated signal. Alternatively, the multi-route transmission device described in 3. 5. The receiving node side monitors the line quality and the line state on the basis of the error of the received signal and the receiving time difference of the same signal, and determines the transmission path from the receiving node side depending on the deterioration state of the monitored object. 5. The multipath transmission device according to claim 1, further comprising a monitoring unit that releases the call and prompts the transmission node side to reset the call.