JP2001057527A - Method and device for communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a necessary minimum communication line when a fault takes place on a transmission line by setting only a preliminarly defined line between two lines set on a 1st communication line onto a 2nd communication line whose band is narrower when the 1st communication line whose band is broader becomes incommunicable. SOLUTION: A telephone line set between a telephone set T2 connected to communication equipment N1 and a telephone set T12 connected to communication equipment N2 and a video line set between a camera T3 connected to the equipment N1 and a monitor T13 connected to the equipment N2 are formed on a both up and down two-way wire transmission line (optical transmission line) for performing, e.g. 155 Mbps optical transmission. In the case a fault takes place on the optical transmission line and the telephone line and the video line constructed on the optical transmission line become incommunicable, the setting of the ATM switches of the ATM communication equipment N1 and N2 is changed so that only the telephone line can continue communication on a radio transmission line with the alarm generation by the fault detection at optical transmitting parts 101 and 102 to as a trigger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system comprising a plurality of communication devices communicably connected to each other via a wired transmission line such as an optical fiber and a wireless transmission line.

[0002]

2. Description of the Related Art In order to improve the reliability of a communication system, even if a failure occurs in the communication system, the system is reconfigured so as to avoid the failure and perform the same function as before the failure ( It is desirable to configure the system so that it can be operated without any problem from the user. For this purpose, for example, a redundant system as shown in FIG.

FIG. 9 shows a normal state and a fault occurrence on a transmission line in a communication system including a plurality of (for example, two in this case) communication devices communicably connected to each other via a wired transmission line. It is a figure for explaining.

In the communication system shown in FIG. 9, a plurality of communication devices are connected by a duplicated optical transmission line having the same communication capacity (here, for example, 155 Mbps). This is realized by a parallel transmission / reception selection method using the other as a spare.

As shown in FIG. 9A, the communication device N11
0 accommodates the data terminal T1, packetizes data output from the data terminal T1, and converts the data into optical transmission units 501 and 502.
And sends the packet to the working and protection optical transmission lines via the. In the communication device N120, normally,
Of the working and protection optical transmission lines, only the packet transmitted via the working optical transmission line via the optical transmission unit 511 is received, data is extracted from the packet, and passed to the data terminal T11. In this state, when any failure occurs on the working optical transmission line, as shown in FIG. 9B, the communication device N120 changes the optical transmission line for receiving the packet from the working to the protection optical transmission line. Switch, receive only the packet transmitted through the spare optical transmission line via the optical transmission unit 512, extract data from the packet,
Hand over to data terminal T11.

[0006]

In this system, the current /
The spare requires a transmission line of the same communication capacity, and always secures twice the communication capacity. Therefore, redundancy is high, cost is high, and the utilization efficiency of the transmission line is low (that is, in this case, 50%). ). Also, depending on the operation state of the communication system, it is not always necessary to maintain communication on all the lines when a failure occurs.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a communication method and a communication apparatus using the same, which can maintain a minimum required communication line at the time of a failure on a transmission line with high transmission efficiency. With the goal.

[0008]

A communication method according to the present invention is a communication method between a plurality of communication devices connected so as to be able to communicate with each other through two communication paths having different bands. When communication on the first communication path having a wider band becomes impossible, only a predetermined line among the lines set on the first communication path is switched to a second communication on a narrower band. By setting on the road, it is possible to maintain the minimum necessary communication line at the time of a failure on the transmission line with high transmission efficiency.

According to the communication method of the present invention, in the communication method between a plurality of communication devices communicably connected to each other via a wired communication path and a wireless communication path, communication via the wired communication path is disabled. At this time, by setting only a predetermined line among the lines set on the wired communication path on the wireless communication path, high transmission efficiency can be maintained at the minimum necessary communication line at the time of a failure on the transmission path. enable.

A communication apparatus according to the present invention is a communication apparatus for setting a line on two communication paths having different bands and performing communication, wherein the first communication path having a wider band among the two communication paths is used. When communication becomes impossible, line setting means for setting only a predetermined line among the lines set on the first communication path on the second communication path having a narrower band is provided. In addition, it is possible to maintain a minimum required communication line at the time of a failure on a transmission line with high transmission efficiency.

[0011] The communication device of the present invention is a communication device for setting a line on a wired communication path and a wireless communication path to perform communication.
When communication on the wired communication path becomes impossible, by providing a line setting means for setting only a predetermined line on the wireless communication path among the lines set on the wired communication path, With high transmission efficiency, it is possible to maintain a minimum required communication line in the event of a failure on the transmission path.

[0012]

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

FIG. 1 shows a schematic configuration of a communication system according to the present invention. A plurality of (for example, two in this case) communication devices N1 and N2 can communicate with each other through two different transmission paths. Connected and configured.

As shown in FIG. 1A, normally, a data line set between a data terminal T1 connected to the communication device N1 and a data terminal T11 connected to the communication device N2 is a radio line. For example, 6 Mb via the transmission devices M1 and M2
It is configured on a wireless transmission path with a transmission speed of ps. The telephone T2 connected to the communication device N1 and the communication device N
The telephone line set between the telephone T12 connected to the communication device N2, the camera T3 connected to the communication device N1, and the communication device N
The video line set between the monitor T13 and the monitor T13 is configured on a wired transmission line (optical transmission line) in both upper and lower directions for performing, for example, 155 Mbps optical transmission.
It is assumed that the communication device N1 and the communication device N2 are connected in a loop through the optical transmission line in the up-down and two-way directions. For the sake of simplicity, it is assumed that the upstream side is the communication device N1 and the downstream side is the communication device N2.

FIG. 1B shows a state in which a failure has occurred on the optical transmission line and communication between the telephone line and the video line formed on the optical transmission line has become impossible. Even in such a state, it is desired that only the most important telephone lines continue communication. It is assumed that the video line and the data line are less important than the telephone line. Therefore, triggered by the detection of a failure in the optical transmission units 101 and 201, only important lines, that is, telephone lines in this case, continue communication on the wireless transmission path.

Hereinafter, a case where the communication devices N1 and N2 shown in FIG. 1 are ATM (Asynchronous Transfer Mode) communication devices will be described as a first embodiment.
A second embodiment will be described as a second embodiment in which the time division multiplexing apparatus 2 is a time division multiplex communication apparatus adapted to SDH (Synchronous Digital Hierarchy).

(First Embodiment) FIGS. 2 and 3 schematically show a configuration of an ATM communication system according to a first embodiment and switching of ATM cells in each of the communication devices N1 and N2. FIG. 2 shows a normal state, and FIG. 3 shows a state when a failure occurs on the optical transmission line. FIG. 2, FIG.
In both figures, (a) shows the communication device N1 on the transmission side, and (b) shows the communication device N2 on the reception side.

First, referring to FIG. 2, A
The switching operation of the TM cell will be described.

As shown in FIG. 2, two ATM communication devices N1 and N2 are connected to each other via two different transmission paths so as to communicate with each other, and communicate with a data terminal T1 connected to the communication device N1. Data terminal T connected to device N2
11 and the wireless transmission device M
1, for example, on a wireless transmission path with a transmission rate of 6 Mbps via M2. Also, a telephone T2 connected to the communication device N1 and a telephone T1 connected to the communication device N2.
2, a camera T3 connected to the communication device N1, and a monitor T1 connected to the communication device N2.
3 is 155 Mbp, for example.
It is configured on an upper and lower bidirectional wired transmission path (optical transmission path) for performing s optical transmission.

As shown in FIG. 2A, in the communication device N1, for example, 4.5 Mbps data input from the data terminal T1 via the interface (IF) unit 111 is converted into an ATM cell by the cell unit 103. Convert to At this time, VCI / VPI is added to the header portion, which is represented here as "A". That is, in FIGS. 2 and 3, the ATM cell transferred by the ATM path set between the data terminal T1 and the data terminal T11 is denoted by an identifier "A" (VCI / VPI).

The communication device N1 converts, for example, 64 Kbps audio data input from the telephone set T2 through the interface (IF) unit 112 into the cell unit 103.
To convert to ATM cells. At this time, the VCI is
/ VPI, which is represented here as "B".
That is, in FIG. 2 and FIG.
AT transferred by the ATM path set between the two
The identifier (VCI / VPI) of "B" is described in the M cell.

Further, the communication device N1 converts, for example, 6 Mbps video data input from the camera T3 via the interface (IF) unit 113 into ATM cells by the cell unit 103. At this time, VCI /
VPI is attached, which is represented here as "C". That is, in FIGS. 2 and 3, the camera T3 is connected to the monitor T12.
ATM transferred by the ATM path set between
An identifier “C” (VCI / VPI) is described in the cell.

The celling unit 103 further converts the ATM cell of the data line for one channel in 4.5 Mbps conversion, the ATM cell of the telephone line for 10 channels in 64 Kbps conversion, and the ATM cell in the video line in 6 Mbps conversion. By bundling 10 channels, as shown in FIG.
Create a 55 Mbps STM-1 frame.

The section overhead (SOH) of the STM-1 frame includes far end received failure information (FERF: Far End Received Failur) for realizing the alarm function.
e) and alarm indication signal (AIS: Alarm Indication Sign)
al). That is, as a warning operation, for a failure from the upstream, the FERF is returned to the upstream,
AIS is sent downstream.

In this embodiment, it is assumed that a failure on the optical transmission line is detected by using FERF and AIS in the STM-1 frame. In the present embodiment, it is assumed that the upstream side is the communication device N1 and the downstream side is the communication device N2.

As shown in FIG. 2A, in the normal state, the AT
The M switch (ATM-SW) unit 102 performs “A” and “B”
While referring to the switching table 115, the ATM cell with the identifier "C"
F) Transfer to one of the unit 114 and the optical transmission unit 101.

FIG. 4A shows an example of the switching table 115 of the communication device N1 at this time. In FIG. 4, for simplicity of description, the IF unit 111 is used as an input port.
To 113, that is, P1 # 1 to P1 # 3, respectively.
4, the identifier of the optical transmission unit 101, that is, P1 # 4, P
1 # 5.

The ATM-SW unit 102 is, for example, as shown in FIG.
Referring to the table 115 as shown in FIG.
The ATM cell with the identifier "A" is assigned to the IF unit 11
4 (output port of identifier "P1 # 4") and "B"
The ATM cell with the identifier "C" is
01 (output port of identifier “P1 # 5”).

In the IF section 114, the ATM-SW section 102
The STM-1 frame received from the wireless transmission device M1
The data is converted to format data that can be processed by the wireless communication device M1 and transferred to the wireless transmission device M1. The wireless transmission device M1 modulates the electrical signal of the data and performs the modulation at a wireless transmission speed of 6 Mbps on the communication device N2. Transmit to

The optical transmission unit 101 includes an ATM-SW unit 102
The signal of the STM-1 frame received from is converted into an optical signal and transmitted to an optical transmission line.

As shown in FIG. 2B, the communication device N2 on the receiving side first converts the radio signal received by the radio transmission device M2 into the original electric signal, and converts the radio signal into the original electric signal.
Hand over to 14.

The IF unit 214 converts the format of data obtained by demodulating the electric signal received from the wireless transmission device M2 into the format of an STM-1 frame.

The optical transmission section 201 converts an optical signal received from the optical transmission line into an electric signal.

As shown in FIG. 2B, the ATM-SW unit 202 normally writes ATM cells with identifiers “A”, “B” and “C” while referring to the switching table 215. The data is transferred to one of the IF units 211 to 213.

FIG. 4B shows an example of the switching table 215 of the communication device N2 at this time. In FIG. 4, for simplicity of explanation, the IF unit 21 is used as an input port.
4, the identifier of the optical transmission path 201, that is, P2 # 4, P
2 # 5, and identifiers of the IF units 211 to 213 as output ports, that is, P2 # 1 to P2 # 1.
P2 # 3 is used for each.

The ATM-SW unit 202 is, for example, as shown in FIG.
Referring to the table 215 as shown in FIG.
The ATM cell with the identifier "A" is assigned to the IF unit 21.
1 (the output port of the identifier "P2 # 1") and "B"
The ATM cell with the identifier "P" is passed to the IF unit 212 (output port of the identifier "P2 # 2"), and the ATM cell with the identifier "C" is transmitted to the IF unit 213 (the output port of the identifier "P2 # 3"). Port).

2 and 3, the IF unit 111
Transmits data received from the data terminal T1 to the communication device N.
The IF unit 211 converts the data transmitted from the communication device N2 to the data terminal T11 so that the data terminal T11 can process the data. is there.

The IF unit 112 converts the audio signal received from the telephone set T2 so that it can be processed by the communication device N1, and the IF unit 212 transmits the audio signal from the communication device N2 to the telephone set T12. Transmit the data to be transferred to camera T12
It is for converting so that it can be processed by.

The IF unit 113 converts the video signal received from the camera T3 so that it can be processed by the communication device N1. Monitor data to be transmitted to monitor T1
3 for conversion so that processing can be performed.

Next, a case where a failure occurs on the optical transmission line and communication between the telephone line and the video line formed on the optical transmission line becomes impossible will be described with reference to FIG. For example, when a failure (for example, communication disconnection) occurs on a downstream optical transmission path from the communication device N1 to the communication device N2, the failure is detected by the optical transmission unit 201 of the communication device N2 and the input signal is lost (LOS: Loss of
Signal). In response, the communication device N2
Remote transmission failure information (FERF: Far)
End Receive Failure) is also returned to the optical transmission line on the upstream side, and the optical transmission unit 101 of the communication device N1 detects FERF. Thus, both the communication devices N1 and N2 can detect a failure on the optical transmission path.

Even in such a state, it is desired that at least only the most important telephone line continue communication. It is assumed that the video line and the data line are less important than the telephone line. Therefore, the ATM communication devices N1 and N2 are configured to continue the communication on the wireless transmission path only through the telephone line by using the alarm generation by the failure detection in the optical transmission units 101 and 201 as a trigger.
Is changed (more specifically, the switching table is rewritten). The method of changing the setting of the ATM switch is not particularly limited, but may be the same as the conventional one. Here, rewriting of the switching table will be described as an example.

FIG. 5A shows the switching table 115 of the communication device N1 rewritten when a failure occurs on the optical transmission line.

As shown in FIG. 3A, the ATM-SW unit 102 refers to, for example, a table 115 as shown in FIG. 5A to refer to the IF unit 112 (identifier “P1 # 2”).
The ATM cell with the identifier "B" input from the input port (i.e., the input port of "P1 # 4") is transferred to the IF section 114 (output port of the identifier "P1 # 4") for wireless transmission.

On the other hand, as shown in FIG. 3B, the ATM-SW unit 202 of the receiving communication device N2
With reference to the table 215 as shown in (b), the IF unit 214 (identifier “P2 #
Only the ATM cell with the identifier "B" input from the input port ("4") is passed to the IF unit 212 (output port with the identifier "P2 # 2").

As described above, the switching table 11
Even when communication is disabled on the optical transmission line by rewriting 5, 215, at least the most important line (here, telephone line) can continue communication on the wireless transmission line.

(Second Embodiment) FIG. 6 schematically shows a schematic configuration of a communication system according to a second embodiment, and how cross-connects are switched in the time division multiplex communication devices N1 and N2. 6 is a normal time, and FIG. 7 is
This figure shows a state when a failure occurs on the optical transmission line. 6A and 6B, FIG. 6A shows the communication device N1 on the transmitting side, and FIG. 6B shows the communication device N2 on the receiving side.

First, the switching operation of the cross connect in the normal case will be described with reference to FIG.

As shown in FIG. 6, two communication devices N1 and N2 are connected to each other via two different transmission paths so that they can communicate with each other. The data terminal T1 connected to the communication device N1 and the communication device The data line set up with the data terminal T11 connected to N2 is a radio transmission device M1, M
2 through a wireless transmission path having a transmission speed of, for example, 6 Mbps. Also, a telephone line set between a telephone T2 connected to the communication device N1 and a telephone T12 connected to the communication device N2, a camera T3 connected to the communication device N1, and a monitor T13 connected to the communication device N2. The video line set between the above is a two-way wired transmission line (optical transmission line) for performing, for example, 155 Mbps optical transmission.
Configured above.

As shown in FIG. 6A, the communication device N1 multiplexes, for example, 4.5 Mbps converted data for one channel input from the data terminal T1 via the interface (IF) unit 144. STM-1 at section 132
(155 Mbps) is inserted at a predetermined time slot position in the payload portion of the frame. This time slot is represented as "A" in FIGS.

The communication device N 1 multiplexes, for example, 10 channels of audio data in terms of 64 Kbps, input from the telephone set T 2 via the interface (IF) unit 142, using the multiplexing unit 133 in STM-1 (155 Mbps).
Is inserted at a predetermined time slot position in the payload portion of the frame. This time slot is represented as "B" in FIGS.

Further, the communication device N1 multiplexes, for example, video data for 10 channels in terms of 6 Mbps, input from the camera T3 via the interface (IF) unit 143, and the multiplexing unit 134 converts the video data to STM-1 (155 Mbps). It is inserted at a predetermined time slot position in the payload portion of the frame. This time slot is indicated by “C” in FIGS.
It expresses.

For example, when a failure (for example, communication disconnection) occurs on the downstream optical transmission path from the communication device N1 to the communication device N2, the failure is detected by the optical transmission unit 201 of the communication device N2. of Signal).
In response, the optical transmission unit 201 of the communication device N2 returns remote end failure information (FERF: Far End Receive Failure) to the optical transmission line on the upstream side, and the optical transmission unit 101 of the communication device N1 detects the FERF. Thereby, the communication device N
Both 1 and N2 can detect a failure on the optical transmission path.

In this embodiment, it is assumed that a failure on the optical transmission line is detected by using FERF in the STM-1 frame. In the present embodiment, the communication device N1 is on the upstream side,
The downstream side is the communication device N2.

As shown in FIG. 6A, normally, the cross-connect unit 231 identifies the time slot positions "A", "B", and "C" and outputs the line signal to the corresponding output signal. Port (interface (IF) unit 144
And any of the optical transmission units 101).

The cross-connect unit 131 inserts the line signal at the time slot position of “A” into a predetermined time slot position of the STM-1 frame on the wireless transmission path to be output to the IF unit 144, and outputs “B” and “C”. Is inserted into a predetermined time slot position of the STM-1 frame on the optical transmission line to be output to the optical transmission unit 101.

In the IF section 144, the cross connect section 13
STM-1 frame received from the wireless transmission device M
1. The data is converted to format data that can be processed by the wireless communication device 1 and passed to the wireless transmission device M1. The wireless transmission device M1 modulates the electric signal of the data and transmits the data at a wireless transmission speed of 6 Mbps Transmit to N2.

The optical transmission unit 101 includes a cross-connect unit 13
1 converts the data signal of the STM-1 frame received from 1 into an optical signal and sends it out to an optical transmission line.

As shown in FIG. 6B, the communication device N2 on the receiving side first converts the radio signal received by the radio transmission device M2 into the original electric signal, and converts the radio signal into the original electrical signal.
Hand over to 44.

The IF unit 244 converts the format of data obtained by demodulating the electric signal received from the wireless transmission device M2 into the format of an STM-1 frame.

The optical transmission section 201 converts an optical signal received from the optical transmission line into an electric signal.

As shown in FIG. 6B, the cross-connect unit 231 normally identifies the time slot positions “A”, “B”, and “C”, and transfers the line signal to the corresponding IF. Assigned to any one of the parts 241 to 243.

That is, the line signal at the time slot position “A” is passed to the separation unit 232 on the IF unit 241 side, and the line signal at the time slot position “B” is passed to the separation unit 233 on the IF unit 242 side. , “C” at the time slot position are passed to the separation unit 234 on the IF unit 243 side.

In the separation units 232 to 234, S
Line signals of a data line, a telephone line, and a video line are separated from their respective time slot positions from the TM-1 frame and passed to interface (IF) units 241 to 243.

6 and 7, the IF unit 141
Transmits data received from the data terminal T1 to the communication device N.
The IF unit 241 is for converting data to be transmitted from the communication device N2 to the data terminal T11 so as to be processed by the data terminal T11. is there.

The IF unit 142 converts the audio signal received from the telephone set T2 so that it can be processed by the communication device N1, and the IF unit 242 conversely converts the audio signal from the communication device N2 to the telephone set T12. Transmit the data to be transferred to camera T12
It is for converting so that it can be processed by.

The IF unit 143 is for converting a video signal received from the camera T3 so that it can be processed by the communication device N1. Monitor data to be transmitted to monitor T1
3 for conversion so that processing can be performed.

Next, a case where a failure occurs on the optical transmission line and communication between the telephone line and the video line formed on the optical transmission line becomes impossible will be described with reference to FIG. For example, when a failure (for example, communication disconnection) occurs on a downstream optical transmission path from the communication device N1 to the communication device N2, the failure is detected by the optical transmission unit 201 of the communication device N2 and the input signal is lost (LOS: Loss of).
Signal). In response, the communication device N2
Remote transmission failure information (FERF: Far)
End Receive Failure) is also returned to the optical transmission line on the upstream side, and the optical transmission unit 101 of the communication device N1 detects FERF. Thus, both the communication devices N1 and N2 can detect a failure on the optical transmission path.

Even in such a state, it is desired that at least only the most important telephone line continue communication. It is assumed that the video line and the data line are less important than the telephone line. Therefore, the switch (SW) setting units 151 and 251 of the communication devices N1 and N2 are configured to continue the communication on the wireless transmission path only for the telephone line by using the alarm generation by the failure detection in the optical transmission units 101 and 201 as a trigger. The setting of each of the cross connect units 131 and 231 is changed.

That is, as shown in FIG.
The setting unit 151 receives the STM-1 input from the IF unit 142.
In order to wirelessly transmit the telephone line signal at the time slot position "B" on the frame, the telephone line signal is inserted into a predetermined time slot position of the STM-1 frame on the wireless transmission path to be output to the IF unit 144. , The setting of the cross-connect unit 131 is changed. Further, as shown in FIG. 7B, the SW setting unit 251 of the communication device N2 on the receiving side.
Is a cross-connect so that only the telephone line signal at the time slot position “B” on the STM-1 frame input from the IF unit 244 via the wireless transmission device M2 is passed to the separation unit 233 on the IF unit 242 side. The setting of the unit 231 is changed.

The separating section 233 separates only the telephone line signal from a predetermined time slot position on the STM-1 frame and passes it to the IF section 242.

As described above, even when communication is disabled on the optical transmission path by resetting the cross-connect unit 231, at least the most important line (here, telephone line) continues communication on the wireless transmission path. be able to.

The method of changing the settings of the cross connect units 131 and 231 by the SW setting units 151 and 251 is not particularly limited, and may be the same as the conventional one.

Although various examples have been described above, the present invention is not limited to these examples and can be applied with various modifications.

[0074]

As described above, according to the present invention,
With high transmission efficiency, it is possible to maintain a minimum required communication line in the event of a failure on the transmission path.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a communication system according to the present invention.

FIG. 2 is a diagram schematically showing a configuration of an ATM communication system according to a first embodiment of the present invention and a state of switching of an ATM cell in each communication device, which shows a normal state.

FIG. 3 is a diagram schematically showing a configuration of an ATM communication system according to the first embodiment of the present invention and a state of switching of ATM cells in each communication device, and shows a state when a failure occurs on an optical transmission line. It is shown.

FIG. 4 is a diagram illustrating an example of a switching table of the communication device in a normal state.

FIG. 5 is a diagram showing an example of a switching table of the communication device when a failure occurs on an optical transmission line.

FIG. 6 is a diagram schematically illustrating a schematic configuration of a communication system according to a second embodiment of the present invention and a state of cross-connect switching in a time-division multiplex communication apparatus, showing a normal state; It is.

FIG. 7 is a diagram schematically illustrating a schematic configuration of a communication system according to a second embodiment of the present invention and a state of cross-connect switching in a time-division multiplex communication device. It shows the situation at the time.

FIG. 8 is a diagram schematically showing a configuration of an STM-1 frame.

FIG. 9 is a diagram showing a configuration example of a conventional redundant system.

[Explanation of symbols]

 M1, M2: Wireless transmission device N1, N2: Communication device T1, T11: Data terminal T2, T12: Telephone T3: Camera T13: Monitor 101, 201: Optical transmission unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 3/00 H04L 11/20 CDF term (Reference) 5K002 AA05 DA03 DA05 EA33 FA01 GA01 GA02 5K021 AA01 AA02 AA06 AA08 BB01 BB06 CC13 CC14 DD02 DD07 EE08 FF01 FF11 5K028 AA14 BB04 BB08 CC05 DD01 DD02 EE03 EE12 KK35 LL02 PP04 QQ01 RR01 TT01 5K030 GA12 HA10 HB01 HB02 HB29 JL01 JL03 JT01 J0703 DD01 JT01 JT01 JT01 JT01 JT01 JT01 JT03

Claims (4)

[Claims] 1. A communication method between a plurality of communication devices communicably connected to each other through two communication paths having different bands, wherein a first communication path having a wider band among the two communication paths. A communication method comprising: setting a predetermined line out of the lines set on the first communication line on the second communication line having a narrower band when the communication of the first communication line becomes impossible. . 2. A communication method between a plurality of communication devices communicably connected to each other via a wired communication path and a wireless communication path, wherein when the communication on the wired communication path becomes impossible, the wired communication is performed. A communication method, wherein only a predetermined line among lines set on a road is set on the wireless communication line. 3. A communication device for performing communication by setting a line on two communication paths having different bands, wherein communication on a first communication path having a wider band among the two communication paths is disabled. And a line setting means for setting only a predetermined line out of the lines set on the first communication line on the second communication line having a narrower band. . 4. A communication apparatus for performing communication by setting a line on a wired communication path and a wireless communication path, wherein when communication on the wired communication path becomes impossible, the line set on the wired communication path. A communication setting means for setting only a predetermined line on the wireless communication path.