JP7827672B2 - Transmission device, transmission system, transmission device control method, and transmission device control program - Google Patents

Description

This disclosure relates to a transmission device, a transmission system, a control method for a transmission device, and a control program for a transmission device.

There are transmission systems that connect transmission devices with multiple dedicated lines. Using such a transmission system, the original data is divided and the divided data is sent and received in parallel over multiple low-speed lines, allowing for high-speed communication even if each line is slow. On the receiving side, the received divided data is combined to restore the original data. At this time, the original data cannot be restored correctly unless the data is combined in the same order as it was divided. For this reason, when using wired connections between transmission devices, the line interface (IF) numbers must match on the sending and receiving sides. If there is a misconnection here, where the numbers are mixed up, the data will not be restored correctly.

Technology to solve this problem is disclosed, for example, in Patent Document 1. This technology notifies the operator whether the transmission device is connected correctly. Specifically, the transmission device operates as follows:

First, the transmitting transmission device generates a control frame that stores the identifier of the transmitting transmission device and the identifier of the transmitting line interface. Next, the transmitting transmission device superimposes the control frame on the main signal. The transmitting transmission device then transmits the main signal to the receiving transmission device. The receiving transmission device adds the identifier of the receiving transmission device and the identifier of the receiving line interface to the received main signal in a control frame. The receiving transmission device returns this data to the transmitting transmission device. Next, the transmitting transmission device extracts these identifiers from the control frame. The transmitting transmission device then compares the extracted identifier combination with predetermined connection information. If the two match, the transmitting transmission device determines that the connection is normal. On the other hand, if the two do not match, the transmitting transmission device determines that the connection is abnormal. If the connection is normal, the transmitting transmission device displays an LED indicating that the connection is normal. On the other hand, if the connection is abnormal, the transmitting transmission device displays an LED indicating that the connection is abnormal. For example, if the connection is normal, green is displayed, and if it is abnormal, red is displayed. In this way, the operator is notified whether the connection is correct or incorrect.

JP 2010-171694 A

The technology in Patent Document 1 allows the worker to recognize whether a connection is correct or incorrect. However, the worker still has to correct the connection.

This disclosure was made in consideration of the above-mentioned problems, and aims to provide a transmission device that automatically corrects connections when a connection error occurs.

To solve the above problem, the transmission device disclosed herein comprises: frame generation means for generating a frame having a header and a payload from input data; frame segment generation means for dividing the frame to be transmitted to generate segmented frames; line interfaces for transmitting each of the segmented frames to a predetermined number of lines; and frame restoration means for, upon receiving the segmented frames, combining the segmented frames in a predetermined order to restore the frame. The transmission device also comprises: connection testing means for transmitting a test signal specific to each of the line interfaces from each of the line interfaces and, upon receiving the test signal, determining whether the test signal was received by the line interface; a connection switching switch for switching the connection between the line and the line interface; and connection switching switch control means for, when the connection testing means determines that the specific test signal has not been received by the line interface corresponding to one of the multiple lines, controlling the connection switching switch so that the line is electrically connected to the receiving line interface corresponding to the transmitting line interface corresponding to the line.

The disclosed method for controlling a transmission device also includes frame generation means for generating a frame having a header and a payload from input data, frame segment generation means for segmenting the frame to be transmitted to generate segmented frames, line interfaces for transmitting each of the segmented frames to a predetermined number of lines, and frame restoration means for, upon receiving the segmented frames, combining the segmented frames in a predetermined order to restore the frame. The method transmits a test signal specific to each of the line interfaces from each of the line interfaces, and, upon receiving the test signal, determines whether or not the test signal has been received. If it is determined that the unique test signal has not been received by the line interface corresponding to one of the multiple lines, controls the connection so that the line is electrically connected to the receiving line interface corresponding to the transmitting line interface corresponding to the line.

The control program for a transmission device disclosed herein also includes frame generation means for generating a frame having a header and a payload from input data, frame segment generation means for segmenting the frame to be transmitted to generate segmented frames, line interfaces for transmitting each of the segmented frames to a predetermined number of lines, and frame restoration means for, upon receiving the segmented frames, combining the segmented frames in a predetermined order to restore the frame. The control program for a transmission device causes the transmission device to perform the following operations: transmit a test signal specific to each of the line interfaces from each of the line interfaces; determine, when the line interface receives the test signal, whether or not the test signal has been received; and, upon determining that the line interface corresponding to one of the multiple lines has not received the specific test signal, control a connection so that the line is electrically connected to the receiving line interface corresponding to the transmitting line interface corresponding to the line.

The effect of this disclosure is to provide a transmission device that automatically corrects connections when a connection error occurs.

FIG. 1 is a block diagram illustrating an example of a transmission device according to the present disclosure. FIG. 10 is a block diagram illustrating a modified example of a transmission device according to the present disclosure. FIG. 1 is a block diagram illustrating an example of a transmission system according to the present disclosure. FIG. 2 is a schematic diagram illustrating an example of a frame used in a transmission device according to the present disclosure. FIG. 2 is a schematic diagram illustrating an example of frame generation in a transmission device according to the present disclosure. FIG. 10 is a schematic diagram illustrating an example of frame division in a transmission device according to the present disclosure. FIG. 2 is a block diagram illustrating a first state of the transmission system of the present disclosure. FIG. 2 is a block diagram illustrating a second state of the transmission system of the present disclosure. FIG. 10 is a block diagram illustrating a third state of the transmission system of the present disclosure. FIG. 10 is a block diagram illustrating a fourth state of the transmission system of the present disclosure. FIG. 10 is a block diagram illustrating a fifth state of the transmission system of the present disclosure. 10 is a flowchart illustrating an example of an operation of a transmission device on a transmitting side according to the present disclosure. 10 is a flowchart illustrating an example of an operation of a receiving-side transmission device according to the present disclosure. FIG. 2 is a block diagram illustrating an example of a hardware configuration of a control system of a transmission device according to the present disclosure.

Embodiments of the present invention will be described in detail below with reference to the drawings. However, while the embodiments described below have technically preferable limitations for implementing the present invention, they do not limit the scope of the invention. Note that similar components in each drawing are given the same numbers, and descriptions may be omitted.

(First embodiment)
FIG. 1 is a block diagram showing a transmission device 100 according to this embodiment. The transmission device 100 includes a frame generation means 10, a frame segment generation means 20, a line interface IF, and a frame restoration means 30. The frame generation means 10 generates a frame having a header and a payload from input data. The frame segment generation means 20 generates frame segments by dividing a frame to be transmitted. A plurality of line interfaces IFs are provided according to the number of lines. The line interfaces IFs transmit the frame segments to a predetermined number of lines. When the transmission device 100 is on the receiving side, each line interface IF receives the frame segments. The frame restoration means 30 then combines the frame segments in a predetermined order. This combination restores the frame.

In addition to the above configuration, the transmission device 100 of the present disclosure also includes a connection testing means 40, a connection changeover switch 50, and a connection changeover switch control means 60.

The connection testing means 40 performs a connection test between the transmitting transmission device 100 and the receiving transmission device 100. In the transmitting transmission device 100, the connection testing means 40 transmits a test signal from each line interface IF. This test signal is unique to each line interface IF. For example, a unique test signal is generated by including the identification number of each line interface IF in the test signal. In addition, in the receiving transmission device 100, when any line interface receives a test signal, the connection testing means 40 determines whether each line interface IF has received the test signal.

The connection changeover switch 50 switches the connection between the line and the line interface IF. Lines and line interfaces IFs are connected one-to-one. In other words, the connection changeover switch 50 operates as a crossbar switch.

The connection changeover switch control means 60 controls the connection changeover switch 50. This control is initiated when the receiving line interface IF corresponding to the transmitting line interface IF is not receiving a test signal. The connection changeover switch control means 60 then controls the connection changeover switch 50 so that the receiving line interface IF corresponding to the transmitting line interface IF is electrically connected to the line.

(Modification)
2 is a block diagram showing a modified example of the transmission device 100 of the present disclosure. In the modified transmission device 100, a tester T is provided for each line interface IF. The tester T is hardware. Each tester T is controlled by a connection testing means 40. That is, the tester T transmits and receives test signals under the control of the connection testing means 40.

Next, the operation of the transmission device 100 will be described using a transmission system 1000 equipped with two transmission devices 100. Figure 3 is a block diagram showing an example of a transmission system 1000 according to the present disclosure.

In the transmission system 1000, two transmission devices 100 are connected by multiple lines. The lines are connected so that the transmitting line interface IFa and the receiving line interface IFb form a one-to-one pair. In this example, the device on the left side of Figure 2 is the transmitting side transmission device 100a. The device on the right side of Figure 3 is the receiving side transmission device 100b. The transmitting side line interface IFa is connected to the corresponding receiving side line interface IFb by a line. Here, it is assumed that line interface IFa1 and line interface IFb1 are to be connected. Similarly, it is assumed that the transmitting side line interface IFa and the receiving side line interface IFb, which have the same number, are to be connected. It is also assumed that the receiving side frame restoration means 30b combines divided frames in the order of the line interface IF numbers.

In the above configuration, split frames are combined in ascending order, starting with line interface IF number 1. Therefore, as shown in Figure 3, if the transmitting line interface IFa and the receiving line interface IFb are connected in the correct order, the frame will be restored correctly. In this case, the correct order means that the numbers of the transmitting line interface IFa and the receiving line interface IFb match. On the other hand, if the number of the transmitting line interface IFa and the number of the receiving line interface IFb are different (misconnection), the frame will not be restored correctly.

The connection changeover switch 50a on the transmitting side is provided with a line interface side terminal 50ad and a line side terminal 50af. The connection changeover switch 50a connects the two in a one-to-one relationship. The connection is switched under the control of the connection changeover switch control means 60a. Similarly, the connection changeover switch 50b on the receiving side is provided with a line interface side terminal 50bd and a line side terminal 50bf.

Before explaining the operation, we will explain the frames transmitted by the transmission device. Figure 4 is a schematic diagram showing an example of a frame 200 used in the transmission device 100 of the present disclosure. Here, we will explain an example where the frame 200 is a Generic Framing Procedure (GFP) frame. However, the frame used is not limited to a GFP frame. The frame 200 is composed of a core header 210 and a payload 220. The core header 210 includes a PLI 211 and a cHEC 212. The PLI 211 is an indicator representing the payload length. The cHEC 212 is used for error checking of the PLI. The cHEC 212 is also a bit for error detection calculated by substituting the PLI into a specified formula. Here, PLI stands for Payload Length Indicator. Also, cHEC stands for core Header Error Control.

The payload 220 includes a payload header 221, data 222, and an FCS (Frame Check Sequence) 223. The FCS 223 is a bit used for checking for data errors.

Figure 5 is a schematic diagram showing an example of frame 200 generation in the transmission device 100 of the present disclosure. In Figure 5, GFP frames 200 consisting of a core header 210 and a payload 220 are generated consecutively. GFP frame 1_201 is generated first. Next, GFP frame 2_202 is generated, and then GFP frame 3_203 is generated.

Figure 6 is a schematic diagram showing an example of frame division in the transmission device 100 of the present disclosure. Frame 200 is divided into n divided frames. Any division method can be used, but for example, frame 200 is divided into divided frames of a predetermined fixed length. Data is then transmitted in the order of divided frame 1_301, divided frame 2_302, divided frame 3_303, ..., divided frame n_30n.

Next, the operation of the transmission device 100 and transmission system 1000 during line connection work will be described. Figure 7 is a block diagram showing a first state of the transmission system 1000. As in the example of Figure 3, the transmitting side is transmission device 100a and the receiving side is transmission device 100b. On the transmitting side, the connection changeover switch 50a is controlled so that the line interface IFa and the lines are connected in order. Line 1 is connected to the transmitting side line interface IFa1. On the receiving side, line 1 is connected to line interface IFb1. In this state, a test signal specific to line interface IFa1 is transmitted from line interface IFa1. The format of the test signal is arbitrary, but it must be identified as being specific to line interface IFa1. For this reason, for example, the test signal includes the identification number of line interface IFa1. This test signal is received by line interface IFb1 via line 1. The connection testing means 40b then determines that the test signal from line interface IFa1 has been received. By referencing this determination result, the connection changeover switch control means 60b detects that the line interface IFa1 and the line interface IFb1 are properly connected. The connection changeover switch control means 60b then controls the connection changeover switch 50b so that this connection is maintained.

The timing at which the connection testing means 40a sends the test signal can be set arbitrarily. For example, the connection testing means 40a may detect that line 1 has been connected to line interface IFb1, and this detection may trigger the connection testing means 40a to send a test signal.

Next, the operator connects line 2, which is connected to line interface IFa2 on the sending side, to one of the line interfaces IFb on the receiving transmission device 100b. At this time, it is possible that the line may be connected to a line interface IFb other than the intended line interface IFb2. This is an incorrect connection.

Figure 8 is a block diagram showing a second state of the transmission system 1000 of the present disclosure. The receiving-side transmission device 100b first attempts to receive a test signal from the line interface IFb2 corresponding to the transmitting-side line interface IFa2. Therefore, in the second state, the connection changeover switch 50b connects the line-side terminal 50bf2 and the line interface-side terminal 50bd2. In this state, line 2 is not connected to the line-side terminal 50bf2. Therefore, the connection testing means 40b determines that the test signal has not been received.

Depending on the result of this determination, the connection changeover switch control means 60 attempts a different connection. For example, the connection is switched sequentially from the line interfaces IF with undetermined connections, starting with the lowest number.

Figure 9 is a block diagram showing the third state of the transmission system 1000 of the present disclosure. In the third state, the connection in the connection changeover switch 50b has changed from the second state. That is, the line side terminal 50bf3 and the line interface side terminal 50bd2 are connected. In this state, line 2 is not connected to the line side terminal 50bf3. Therefore, the connection testing means 40b determines that the test signal has not been received. Therefore, the connection changeover switch control means 60 further searches for a connection that can receive the test signal.

Figure 10 is a block diagram showing the fourth state of the transmission system 1000 of the present disclosure. In the connection changeover switch 50b, the line interface side terminal 50bd2 is connected to the line side terminal 50bfm. In this state, line 2 is not connected to the line side terminal 50bf2. Therefore, the connection testing means 40b determines that the test signal has not been received. Therefore, the connection changeover switch control means 60 further searches for a connection that can receive the test signal.

Figure 11 is a block diagram showing the fifth state of the transmission system 1000 of the present disclosure. In the connection changeover switch 50b, the line interface side terminal 50bd2 is connected to the line side terminal 50bfn. In this state, line 2 is connected to the line side terminal 50bf2. Therefore, the connection testing means 40b determines that reception of the test signal is possible. Therefore, the connection changeover switch control means 60 controls the connection changeover switch 50 to maintain this connection.

By maintaining the above connection, the sending line interface IFa2 and the receiving line interface IFb2 are connected. In other words, a normal connection is established.

In the same way, the connections between line 3 and subsequent lines and the receiving line interface IFb are corrected in sequence. The connection work is then completed when all line connections are restored to normal. In this state, the receiving side's frame restoration means 30b can correctly restore frame 200 by combining the divided frames in the scheduled order. In other words, all lines are automatically restored to a normal connection state.

Next, the gist of the above operation will be explained. Figure 12 is a flowchart showing an example of the operation of the transmitting-side transmission device 100a of the present disclosure.

First, for example, when an operator or other person connects a line, the kth transmitting line interface IFak is connected to one of the receiving line interfaces IFb. The transmitting connection testing means 40a then detects this connection (S1). Here, k is set, for example, to the smallest number for which a connection is not maintained. Upon detecting this connection, the connection testing means 40a transmits a test signal specific to the line interface IFak to line_k (S2).

Figure 13 is a flowchart showing an example of the operation of the receiving-side transmission device 100b of the present disclosure. First, in the connection changeover switch 50b, the line interface side terminal 50bdk is connected to the line side terminal 50bfk (S11). Next, the connection testing means 40b determines whether a test signal corresponding to the transmitting-side line interface IFak has been received (S12). The connection changeover switch control means 60 then references this determination result. If a test signal has been received (S12_Yes), the connection changeover switch control means 60 maintains this connection (the connection between the line interface side terminal 50bdk and the line side terminal 50bfk) (S14). Next, it determines whether there is a line interface IFb for which the connection is not maintained (S15_No). If there is no line interface IFb for which the connection is not maintained (S15_No), the operation ends. On the other hand, if there is a line interface IFb for which the connection is not maintained (S15_Yes), the operation returns to S12 and the operation to establish the next connection is performed.

On the other hand, if the connection testing means 40b does not receive a test signal in the determination of S12 (S12_No), the next control is performed. That is, the connection changeover switch control means 60b switches the connection of the connection changeover switch 50 until the connection testing means 40b detects the reception of a test signal (S13). Then, when a connection that can receive a test signal is detected, the connection changeover switch control means 60 performs control to maintain this connection (S14). Next, it is determined whether there is a line interface IFb for which a connection is not being maintained (S15). Here, if there is no line interface IFb for which a connection is not being maintained (S15_No), the operation ends. On the other hand, if there is a line interface IFb for which a connection is not being maintained (S15_Yes), the operation returns to S12 and the operation to establish the next connection is performed.

The above operation allows the connection to be corrected even if an incorrect connection occurs. As a result, the frame restoration means 30 combines the divided frames in the expected order, thereby correctly restoring frame 200.

Figure 14 is a block diagram showing an example of the hardware configuration of the transmission device 100 in which control units such as the connection changeover switch control means 60 are implemented. This hardware is, for example, a general-purpose computer. As shown in Figure 14, this computer includes, for example, a processor 101, memory 102, display unit 103, input unit 104, storage unit 105, and communication interface 106. The processor 101 executes arithmetic processing. The memory 102 stores data used in the arithmetic processing. The display unit 103 displays data, etc. The input unit 104 accepts input from outside. The storage unit 105 stores data. Furthermore, communication between the computer and external devices is carried out via the communication interface 106.

The transmission device 100 and other components of the present disclosure have been described above.

The transmission device 100 of the present disclosure comprises a frame generation means 10, a frame segment generation means 20, a line interface IF, and a frame restoration means 30. The frame generation means 10 generates a frame 200 having a header and a payload from input data. The frame segment generation means 20 generates frame segments by dividing the frame 200 to be transmitted. The line interface IF transmits each of the frame segments to a predetermined number of lines. Upon receiving the frame segments, the frame restoration means 30 combines the frame segments in a predetermined order to restore the frame. The transmission device 100 also comprises a connection testing means 40, a connection changeover switch 50, and a connection changeover switch control means 60. The connection testing means 40 transmits a test signal specific to each line interface IF from each line interface IF. Furthermore, when the line interface IF receives a test signal, the connection testing means 40 determines whether the test signal has been received. The connection changeover switch switches the connection between the line and the line interface IF. The connection changeover switch control means 60 controls the connection changeover switch 50 in response to the determination of the connection test means 40. This determination is made by determining that a test signal is not being received at the line interface IF corresponding to one of the multiple lines. The connection changeover switch control means 60 then controls the connection changeover switch so that the line is electrically connected to the receiving line interface IFb corresponding to the transmitting line interface IFa.

With the above configuration, even if there is an error in the connection between the transmitting line interface IFa and the receiving line interface IFb, the order of the receiving line interface IFb is automatically corrected to ensure the scheduled order.

Also, according to one aspect, the transmission device 100 is on the receiving side. At this time, the line interface IFb may be unable to receive the test signal from the corresponding line interface IFa on the transmitting side. In this case, the connection switch control means 60 sequentially switches the connection between the line-side connection terminal of the connection switch 50 and the connection terminal of the line interface. Then, the connection testing means 40 identifies a connection that can receive the test signal.

In the above configuration, the connection changeover switch 50 sequentially switches between connections to search for a connection that can receive the test signal. This ensures that a connection that can receive the test signal is detected reliably.

Furthermore, according to one aspect, in the transmission device 100, the connection changeover switch control means 60 controls the connection changeover switch 50 so as to maintain a connection capable of receiving the test signal identified above.

By using the above configuration, connection combinations that have established normal connections are maintained.

Also, according to one aspect, the connection testing means 40 detects that the line interface IF has been connected to the line interface IF of the destination transmission device 100. Then, upon this detection, the connection testing means 40 transmits a test signal.

In the above configuration, a test signal is sent and a connection test is performed each time a line is connected between the sending transmission device 100a and the receiving transmission device 100b. This ensures that connection tests are performed without exception.

Furthermore, the transmission system 1000 of the present disclosure includes two transmission devices 100. The line interface IF of one transmission device 100 and the line interface IF of the other transmission device 100 form a pair. This pair is connected by a line.

With the above configuration, even if there is an error in the connection between the sending line interface IFa and the receiving line interface IFb, the order of the line interfaces IFb is automatically corrected to ensure the scheduled order.

Furthermore, a control method for a transmission device 100 disclosed herein controls the transmission device 100. The transmission device 100 has a frame generation means 10, a frame segment generation means 20, a line interface IF, and a frame restoration means 30. The frame generation means 10 generates a frame 200 having a header and a payload from input data. The frame segment generation means 20 generates frame segments by dividing the frame 200 to be transmitted. The transmission device 100 also has a connection test means 40, a connection changeover switch 50, and a connection changeover switch control means 60. The line interface IF transmits each of the frame segments to a predetermined number of lines. Upon receiving the frame segments, the frame restoration means 30 combines the frame segments in a predetermined order to restore the frame. Then, each line interface IF transmits a test signal specific to that line interface IF. When the line interface IF receives the test signal, it is determined whether the line interface IF has received the test signal. The connection testing means 40 then determines that the test signal is not being received at the line interface IF corresponding to one of the multiple lines. In response, the connection changeover switch control means 60 controls the connection of the connection changeover switch 50. This control is performed so that the line is electrically connected to the receiving line interface IF corresponding to the transmitting line interface IF.

With the above configuration, even if there is an error in the connection between the sending line interface IF and the receiving line interface IF, the order of the receiving line interface IF is automatically corrected to ensure the scheduled order.

The control program for the transmission device 100 of the present disclosure causes the transmission device 100 to execute processing. The transmission device 100 includes a frame generation means 10, a frame segment generation means 20, a line interface IF, and a frame restoration means 30. The frame generation means 10 generates a frame 200 having a header and a payload from input data. The frame segment generation means 20 generates frame segments by dividing the frame 200 to be transmitted. The transmission device 100 also includes a connection test means 40, a connection changeover switch 50, and a connection changeover switch control means 60. The line interface IF transmits each of the frame segments to a predetermined number of lines. Upon receiving the frame segments, the frame restoration means 30 combines the frame segments in a predetermined order to restore the frame. The control program for the transmission device 100 then causes the transmission device to execute the following processing. One of these processing steps is to transmit a test signal specific to each line interface from each line interface IF. One example is the process of determining whether a test signal has been received when the line interface IF receives one. Another example is the process of determining that a test signal has not been received by the line interface IF. Here, a test signal corresponding to one of multiple lines is received. Another example is the process of controlling the connection between the line and the line interface IF in response to that signal. This control is then performed so that the line is electrically connected to the receiving line interface IF corresponding to the transmitting line interface IF.

With the above configuration, even if there is an error in the connection between the transmitting line interface IF and the receiving line interface IF in the transmission device 100, the order of the receiving line interface IF is automatically corrected to ensure the scheduled order.

The scope of the present invention also includes a program that causes a computer to execute the processing of the above-described embodiment, and a recording medium on which the program is stored. Examples of recording media that can be used include magnetic disks, magnetic tapes, optical disks, magneto-optical disks, and semiconductor memories.

The present invention has been described above using the above-mentioned embodiment as an exemplary example. However, the present invention is not limited to the above-mentioned embodiment. In other words, the present invention can be applied in various aspects that are understandable to those skilled in the art within the scope of the present invention.

Some or all of the above embodiments may also be described as, but are not limited to, the following notes.

(Appendix 1)
a frame generating means for generating a frame having a header and a payload from input data;
a frame division generating means for dividing the frame to be transmitted and generating frame divisions;
a line interface for transmitting each of the divided frames to a plurality of predetermined lines;
a frame restoration means for, when receiving the divided frames, combining the divided frames in a predetermined order to restore the frame;
A transmission device having:
a connection test means for transmitting a test signal specific to each of the line interfaces from each of the line interfaces, and for determining whether or not the test signal has been received when the line interface receives the test signal;
a connection changeover switch for switching the connection between the line and the line interface;
a connection changeover switch control means for controlling the connection changeover switch in response to the connection testing means determining that the specific test signal has not been received by the line interface corresponding to any of the plurality of lines so that the line is electrically connected to the line interface on the receiving side corresponding to the line interface on the transmitting side corresponding to the line;
Equipped with
A transmission device characterized by:

(Appendix 2)
When the transmitting device is a receiving device,
The connection changeover switch control means
When the line interface fails to receive the test signal from the corresponding line interface on the transmitting side, the connection terminals of the line interfaces to which the line side connection terminals of the connection changeover switch are connected are sequentially switched;
The connection testing means
identifying a connection capable of receiving the test signal;
2. The transmission device according to claim 1,

(Appendix 3)
The connection changeover switch control means
Maintaining a connection capable of receiving the identified test signal;
3. The transmission device according to claim 2,

(Appendix 4)
The connection testing means
detecting that the line interface is connected to the line interface of the destination transmission device, and transmitting the test signal in response to the detection;
4. The transmission device according to claim 1, wherein:

(Appendix 5)
Two of the transmission devices according to any one of Supplementary Notes 1 to 4 are provided;
the line interface of one of the transmission devices is connected to the line interface of the other of the transmission devices so as to form a pair;
A transmission system characterized in that:

(Appendix 6)
a frame generating means for generating a frame having a header and a payload from input data;
a frame division generating means for dividing the frame to be transmitted and generating frame divisions;
a line interface for transmitting each of the divided frames to a plurality of predetermined lines;
a frame restoration means for, when receiving the divided frames, combining the divided frames in a predetermined order to restore the frame;
A control method for a transmission device having
transmitting, from each of said line interfaces, a test signal specific to each of said line interfaces;
When the line interface receives the test signal, it determines whether or not the test signal has been received;
controlling a connection in response to determining that the test signal has not been received by the line interface corresponding to any of the plurality of lines so that the line is electrically connected to the line interface on the receiving side corresponding to the line interface on the transmitting side corresponding to the line;
A method for controlling a transmission device.

(Appendix 7)
a frame generating means for generating a frame having a header and a payload from input data;
a frame division generating means for dividing the frame to be transmitted and generating frame divisions;
a line interface for transmitting each of the divided frames to a plurality of predetermined lines;
a frame restoration means for, when receiving the divided frames, combining the divided frames in a predetermined order to restore the frame;
A control program for a transmission device comprising:
transmitting, from each of said line interfaces, a test signal specific to each of said line interfaces;
When the line interface receives the test signal, a process of determining whether or not the test signal has been received;
a process of controlling a connection so that, in response to determining that the test signal has not been received by the line interface corresponding to any of the plurality of lines, the line interface on the receiving side corresponding to the line interface on the transmitting side corresponding to the line is electrically connected to the line;
A control program for a transmission device, which causes the transmission device to execute the above.

REFERENCE SIGNS LIST 10 Frame generation means 20 Frame division generation means 30, 30b Frame restoration means 40, 40a, 40b Connection test means 50, 50a, 50b Connection changeover switch 60, 60a, 60b Connection changeover switch control means 100, 100a, 100b Transmission device 1000 Transmission system 200 Frame IF, IFa, IFb Line interface T Tester

Claims (7)

a frame generating means for generating a frame having a header and a payload from input data;
a divided frame generating means for dividing the frame to generate divided frames;
a plurality of line interfaces for transmitting and receiving the divided frames to and from a communication partner transmission device via a plurality of predetermined lines;
a frame restoration means for combining, in a predetermined order, divided frames received from a plurality of line interfaces provided in the transmission device of the other party of communication , and restoring a frame generated by a frame generation means provided in the transmission device of the other party of communication ;
A transmission device having:
a connection testing means having a function of transmitting a test signal specific to each line interface from each said line interface, and a function of determining whether or not the test signal received by the line interface is a test signal specific to the line interface of the transmission device of the communication partner corresponding to said line interface;
a connection changeover switch for switching the connection between the line and the line interface;
a connection changeover switch control means for controlling the connection changeover switch so that the line interface of the transmission device of the other communication party and the line interface corresponding to this line interface are electrically connected in response to the connection test means determining that the test signal specific to the line interface of the transmission device of the other communication party corresponding to this line interface has not been received;
Equipped with
A transmission device characterized by: The connection changeover switch control means
when a specific test signal cannot be received from the line interface of the transmission device of the communication partner corresponding to the line interface, sequentially switching the connection between the line side connection terminal and the line interface side connection terminal provided in the connection changeover switch;
The connection test means
A line interface identifies a connection of the connection changeover switch that can receive a unique test signal from a line interface of a corresponding communication partner transmission device .
2. The transmission device according to claim 1. The connection changeover switch control means
Maintaining the connection of the identified connection changeover switch ;
3. The transmission device according to claim 2. The connection testing means
Detecting that the line interface is connected to the line interface of the communication partner transmission device, and transmitting a test signal specific to the line interface upon detection.
4. The transmission device according to claim 1, wherein the first and second inputs are connected to the first and second inputs. Two of the transmission devices according to any one of claims 1 to 3 are provided,
the line interface of one of the transmission devices is connected to the line interface of the other of the transmission devices so as to form a pair;
A transmission system characterized in that: a frame generating means for generating a frame having a header and a payload from input data;
a divided frame generating means for dividing the frame to generate divided frames;
a plurality of line interfaces for transmitting and receiving the divided frames to and from a communication partner transmission device via a plurality of predetermined lines;
a frame restoration means for combining, in a predetermined order, divided frames received from a plurality of line interfaces provided in the transmission device of the other party of communication , and restoring a frame generated by a frame generation means provided in the transmission device of the other party of communication ;
A control method for a transmission device having
transmitting a test signal from each line interface that is specific to said line interface ;
When a test signal is received by the line interface, it is determined whether the received test signal is a test signal specific to the line interface of the transmission device of the communication partner corresponding to the line interface;
controlling a connection so that the line interface of the transmission device of the communication partner and the line interface corresponding to this line interface are electrically connected in response to determining that the test signal specific to the line interface of the transmission device of the communication partner corresponding to this line interface is not received;
A method for controlling a transmission device. a frame generating means for generating a frame having a header and a payload from input data;
a divided frame generating means for dividing the frame to generate divided frames;
a plurality of line interfaces for transmitting and receiving the divided frames to and from a communication partner transmission device via a plurality of predetermined lines;
a frame restoration means for combining, in a predetermined order, divided frames received from a plurality of line interfaces provided in the transmission device of the other party of communication , and restoring a frame generated by a frame generation means provided in the transmission device of the other party of communication ;
A control program for a transmission device comprising:
transmitting a test signal from each line interface that is specific to said line interface ;
a process of determining whether or not the test signal received by the line interface is a test signal specific to the line interface of the communication partner transmission device corresponding to the line interface ;
a process of controlling a connection so that the line interface of the transmission device of the communication partner and the line interface corresponding to this line interface are electrically connected in response to determining that the test signal specific to the line interface of the transmission device of the communication partner corresponding to this line interface is not received;
A control program for a transmission device, which causes the transmission device to execute the above.