JP2003209527A - Transmission line duplex system for multiplex communication equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission line duplex system for multiplex communication equipment capable of quickly switching a transmission line regardless of the kind of a protocol and effectively utilizing multiplexed channels further. <P>SOLUTION: The transmission line duplex system for the multiplex communication equipment is composed of a switching device for duplexing the data of a plurality of the transmission lines and distributing them to the transmission line of an operation system and the transmission line of a standby system and multiplexers provided respectively in the transmission line of the operation system and the transmission line of the standby system for multiplexing the data distributed from the switching device and transmitted through the plurality of the transmission lines. The switching device and the multiplexers are respectively provided with a control part and the respective control parts switch the transmission line from the operation system to the standby system in cooperation when detecting a transmission line fault by the interruption of data signals transmitted through the respective transmission lines. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission system using a multiplexed communication device, and more particularly to a transmission line duplication system for a multiplexed communication device having a duplicated transmission line.

[0002]

2. Description of the Related Art Conventionally, in order to improve the reliability of a multiplexed communication system, the transmission line is duplicated with an active system and a standby system, and when a failure occurs in the active system transmission line, it is switched to the standby system. The system is built.

As the communication system, various protocols are used, but a protocol having an alarm transfer function for generating and transferring an alarm when a failure occurs in a transmission line is used, and the transferred alarm is transmitted. Upon confirmation, the active system was switched to the standby system.

Further, the switching unit for switching between the active system and the standby system is combined with a multiplexing device for multiplexing, and the signal is multiplexed and separated under the control of the same control unit and the switching between the active system and the active system. Was being done.

[0005]

Since the above-mentioned transmission line duplication system of the conventional multiplex communication device is premised on using the protocol having the alarm transfer function,
For example, there is a problem that it cannot be applied to a communication system using a data communication protocol in which an alarm transfer function such as Ethernet is not defined.

Further, even when the alarm transfer function is used, there is a problem that the switching cannot be performed quickly because the standby system is not switched until the alarm transfer is completed.

Further, since the switching unit and the multiplexing device are integrated, the line of the user who uses the service is connected to the multiplexing device through the switching device, resulting in a large scale of the device and cost. It was getting higher.

In addition, since the line connected to the switching unit is duplicated inside the device and connected to the multiplexing device, there is a case where a service for duplexing a transmission line and a service for not duplexing are mixed. However, the line of a user who does not need the duplex service (single service) will be connected in a duplicated manner, and there is a problem that the multiplexed channel cannot be effectively used.

The present invention has been made in view of the problems of the above-described conventional technique, and it is possible to quickly switch the transmission line regardless of the type of protocol.
Further, it is another object of the present invention to realize a transmission line duplication system of a multiplexed communication device which can effectively use multiplexed channels.

[0010]

A transmission line duplication system for a multiplexed communication apparatus according to the present invention includes a switching device for duplicating data of a plurality of transmission lines and distributing the data to an active transmission line and a standby transmission line. A multiplexing device provided on each of the operating system transmission line and the standby system transmission line and multiplexing the data transmitted on the plurality of transmission lines distributed from the switching device. A redundant transmission line system,
A control unit is provided in each of the switching device and the multiplexing device, and each control unit cooperates when the transmission line failure is detected due to the disconnection of the data signal transmitted through each transmission line, and the transmission line is changed from the active system to the standby system. It is characterized by switching.

In this case, the multiplexing device includes a plurality of low speed transmission / reception units connected to the switching device, a multiplexing unit for multiplexing the data received by the low speed transmission / reception unit, and a multiplexing unit for the multiplexing unit. The high-speed transmission / reception unit for transmitting the generated multiplexed data to another opposing multiplexing device and the plurality of low-speed transmission / reception units for separating the multiplexed data from the opposing multiplexing device received by the high-speed transmission / reception unit And a control unit that controls the operation of each unit. Each of the low-speed transmission / reception unit and the high-speed transmission / reception unit is connected to a switching device and a multiplexer provided opposite to the transmission device and connected to a predetermined transmission line. When the signal input is interrupted for a time or longer, it is notified as an input abnormality to that effect and the output of the signal is stopped. It is also possible to stop the signal output of the signal unit.

In any of the above, the switching device includes a plurality of first low-speed transmitting / receiving units respectively connected to a plurality of transmission lines, and an operating system and a standby system corresponding to the plurality of first low-speed transmitting / receiving units. A plurality of transmission lines, each of which is provided between the first and second low-speed transmission / reception units and the second and third low-speed transmission / reception units; The data from the first low-speed transmission / reception unit is duplicated and sent to the second and third low-speed transmission / reception units.
And a duplication selection unit that selects any one of the data from the third low-speed transmission / reception unit and sends it to the first low-speed transmission / reception unit, and a control unit that controls the operation of each unit. The low-speed transmission / reception unit notifies the control unit of an input abnormality when a signal input is disconnected from the transmission line connected to the multiplexer for a predetermined time or longer, and the control unit having received the notification normally selects the copy selection. Section to select the data from the second low-speed transmission / reception section, and when the second low-speed transmission / reception section receives the input abnormality notification, the third low-speed transmission / reception section notifies the input abnormality of a predetermined time or more. After confirming that the data has not been received, the duplication selection unit may be caused to select the data from the third low-speed transmission / reception unit.

The duplication selecting unit duplicates the data from the first low speed transmission / reception unit and sends it to the second and third low speed transmission / reception units, and the duplication selection unit from the second and third low speed transmission / reception units. It may be composed of a selection unit for selecting any one of the data and transmitting it to the first low-speed transmission / reception unit.

Further, the copy selecting section may be a switch having a plurality of input / output ports.

In the transmission line duplication system of the multiplex communication apparatus according to the present invention configured as described above, when a fault in the transmission line is detected, the optical output interruption is used to notify the transmission line fault to both ends of the duplexed section. By doing so, high-speed transmission path switching is realized.

By dividing the duplexing switching function and the multiplexing function, it is possible to simultaneously provide a redundant transmission line service and a single transmission line service, and increase the number of accommodated lines.

Since the multiplexer and the switching device are separated, the disconnection of the input signal is detected on the switching device side independently without terminating the transmission frame for each accommodated channel. It is also a feature that the switching device itself does not depend on the communication protocol.

It is also a feature that different protocols can be used for each channel in one switching device.

It is also a feature that different transmission paths can be independently selected for each channel on the transmission path side to be duplexed, and the application range is wider than when the duplexing switching unit is provided in the multiplexing device.

Although the input / output interruption of light is utilized, the same method can be realized by the interruption of input / output of an electric signal.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a first embodiment of a transmission line duplication system for a multiplexed communication apparatus according to the present invention.

In this embodiment, two switching devices 101 and 10 are used.
6 and 4 multiplexers 102, 103, 104, 10
5 and a line connecting each device. The configurations of the two switching devices 101 and 106 and the four multiplexing devices 102, 103, 104 and 105 are respectively configured in the same manner, and the multiplexing devices 102 to 105 provided between the switching devices 101 and 106. Is used for transmission between the switching devices. The multiplexers 102 and 104 constitute a 0-system high-speed transmission line which is one transmission line, and the multiplexing device 10
Reference numerals 3 and 105 constitute a 1-system high-speed transmission line which is the other transmission line.

In the present embodiment, as described above, the number of multiplexing by the multiplexer is 4, but the present invention can be applied if the number of multiplexing is an integer of 1 or more.

First, the configurations of the switching devices 101 and 102 will be described in detail.

The switching device 101 includes low-speed transmission / reception units 1-1 to 1-1.
1-4, 4-0-1--4-0-4, 4-1-1-4-1-4, C
OPY section (replication section) 2-1 to 2-4, SEL section (selection section)
3-1 to 3-4 and a control unit 5 that is connected to each of these units and controls the operation thereof.

The low speed transmission / reception units 1-1 to 1-4 are the switching devices 1
01 is connected to low speed lines 1a to 4a which are connection lines to the outside, and in the switching device 101, the COPY section 2-1 to 2-1 is connected.
2-4 and SEL units 3-1 to 3-4, respectively, and optical signals on the low speed lines 1a to 4a and the switching device 1
It has a bidirectional conversion function with the electric signal in 01. Also,
The low speed transmission / reception units 1-1 to 1-4 monitor the signals input from the low speed lines 1a to 4a, and when an abnormality such as a signal input interruption for a predetermined time or more is detected, the control unit 5 is notified of an abnormality in the input signal. Has a function to notify. Furthermore, the low-speed transmission / reception unit 1-1 to 1-
Reference numeral 4 has a function of stopping the optical output to the low speed lines 1a to 4a according to the output control signal input from the control unit 5.

The COPY units 2-1 to 2-4 duplicate the signals input from the low speed transmission / reception units 1-1 to 1-4, and low speed transmission / reception units 4-0-1 to 4-0-4 and 4-. It has a function of outputting to each of 1-1 to 4-1-4.

The SEL units 3-1 to 3-4 are the low-speed transmission / reception unit 4
-Input signals from 0-1 to 4-0-4 and 4-1 to 4-1 to 4 respectively, and select one of the input signals according to the selection signal input from the control unit 5. Low speed transceiver 1
It has a function to output to -1 to 1-4.

Low-speed transmission / reception unit 4-0-1 to 4-0-4, 4-1-
1 to 4-4-1 are copy units 2-1 in the switching device 101.
2-4 and SEL units 3-1 to 3-4, and low-speed transmission lines 1a-0 to 4a-0, 1a-1 to 4a provided respectively between the multiplexers 102 and 103. -1, which is connected to the multiplexing devices 102 and 103, and the electrical signals in the switching device 101 and the low-speed transmission lines 1a-0 to 4a-0,
It has a bidirectional conversion function with the optical signals on 1a-1 to 4a-1. In addition, low-speed transmission lines 1a-0 to 4a-0, 1a-1 to 4
It has a function of monitoring the signal input from a-1 and notifying the control unit 5 of the abnormality of the input signal when an abnormality such as a signal input interruption for a predetermined time or more is detected. Further, according to the output control signal input from the control unit 5, the low speed transmission line 1a-0
It has a function of stopping the optical output to 4a-0, 1a-1 to 4a-1.

The control unit 5 includes low-speed transmission / reception units 1-1 to 1-4 and low-speed transmission / reception units 4-0-1 to 4-0-4 and 4-1 to 4-1-4.
An input abnormality signal indicating an abnormality in the input signal input from each of the channels is monitored for each channel, and the optical output control of each low-speed transmission / reception unit and the selection control function of the SEL units 3-1 to 3-4 are provided.

The switching device 102 has the same configuration as that of the switching device 101, and the low-speed transmission / reception units 17-1 to 17-4, 14-0-1 to 14-0-4, 1 in the switching device 102.
Each of 4-1-1 to 14-1-4 is a low-speed transmission / reception unit 1-1 to 1-4, 4-0-1 to 4-0- in the switching device 101.
4, 4-1-1 to 4-1-4, which correspond to COPY units 15-1 to 15-4 and SEL unit 16-1 in the switching device 102.
Each of 16-4 and the control unit 18 includes a switching device 101.
COPY section 2-1 to 2-4, SEL section 3-1 to 3-
4 and the control unit 5.

The low-speed transmission / reception units 17-1 to 17-4 are connected to the low-speed lines 1b to 4b which are connection lines with the outside of the switching device 102, and the COPY unit 16 in the switching device 102.
-1 to 16-4 and SEL units 15-1 to 15-4, respectively, and has a bidirectional conversion function between an optical signal on the low speed lines 1b to 4b and an electric signal in the switching device 102. Further, the low-speed transmission / reception units 17-1 to 17-4 monitor the signals input from the low-speed lines 1b to 4b, and when an abnormality such as a signal input interruption for a predetermined time or longer is detected, the control unit 18 receives the input signals. It has a function of notifying an abnormality. Further, the low speed transmission / reception units 17-1 to 17-4 have a function of stopping the optical output to the low speed lines 1b to 4b according to the output control signal input from the control unit 18.

The copy units 16-1 to 16-4 duplicate the signals input from the low speed transmission / reception units 17-1 to 17-4 to reproduce the low speed transmission / reception units 14-0-1 to 14-0-4 and 14-. 1-1 ~
It has a function to output to each of 14-1-4.

The SEL units 15-1 to 15-4 are low-speed transmitting / receiving units 14-0-1 to 14-0-4 and 14-1-1 to 14-1-.
4 has a function of inputting a signal from each of them, selecting one of the input signals in accordance with a selection signal input from the control unit 18, and outputting the selected input signal to the low speed transmission / reception units 17-1 to 17-4.

Low-speed transmitting / receiving section 14-0-1 to 14-0-4,1
4-1-1 to 14- 1-4 are COPY in the switching device 102.
The low-speed transmission lines 1b-0 to 4b-0, 1b connected to the units 16-1 to 16-4 and the SEL units 15-1 to 15-4 and provided between the multiplexers 104 and 105, respectively. -1-
4b-1 is connected to the multiplexing devices 104 and 105, and the electrical signal in the switching device 102 and the low-speed transmission line 1 are connected.
It has a bidirectional conversion function with the optical signals on b-0 to 4b-0 and 1b-1 to 4b-1. In addition, the low-speed transmission line 1b-0 to 4b-
It has a function of monitoring the signals input from 0, 1b-1 to 4b-1 and notifying the control unit 18 of the abnormality of the input signal when an abnormality such as a signal input interruption for a predetermined time or more is detected. Further, it has a function of stopping the optical output to the low-speed transmission lines 1b-0 to 4b-0, 1b-1 to 4b-1 according to the output control signal input from the control unit 18.

The control unit 18 includes low-speed transmission / reception units 17-1 to 17-1.
7-4 and low-speed transmission / reception unit 14-0-1 to 14-0-4, 14-1
-1 to 14-1-4 Monitors the input abnormality signal indicating the abnormality of the input signal for each channel, controls the optical output of each low-speed transmission / reception unit, and selects SEL units 15-1 to 15-4 Has a control function.

Next, the configurations of the multiplexers 102 to 105 will be described in detail.

The multiplexer 102 includes a low speed transmission / reception section 5-0-
1 to 5-0-4, a MUX unit 6-0, a DMUX unit 7-0, a high-speed transmission / reception unit 8-0, and a control unit 9-0 connected to these units and controlling the operation thereof.

Each of the low speed transmission / reception units 5-0-1 to 5-0-4 is connected to the switching device 1 via the low speed transmission lines 1a-0 to 4a-0.
01 is connected to the low-speed transmission / reception units 4-0-1 to 4-0-4, and in the multiplexer 102, the MUX unit 6-0 and the DMUX unit 7-
0, which has a bidirectional conversion function between an optical signal on the low-speed transmission lines 1a-0 to 4a-0 and an electric signal in the multiplexer 102. Further, the signals input from the low-speed transmission lines 1a-0 to 4a-0 are monitored, and when an abnormality such as a signal input interruption for a predetermined time or more is detected, the control unit 9-0 is notified of the abnormality of the input signal. Further, it has a function of stopping the optical output to the low speed transmission lines 1a-0 to 4a-0 according to the output control signal input from the control unit 9-0.

The MUX section 6-0 is a low-speed transmission / reception section 5-0-1.
The signals input from -5-0-4 are multiplexed and output to the high-speed transmission / reception unit 8-0. It also has a function of inserting a transmission path abnormality detection pattern indicating the above for each channel in accordance with an instruction from the control unit 9-0.

The DMUX unit 7-0 separates the signal input from the high speed transmission / reception unit 8-0 into channel units, and outputs the signals to the low speed transmission / reception units 5-0-1 to 5-0-4 of the corresponding channel. It also has a function of detecting a transmission path abnormality detection pattern indicating an abnormality of each channel and notifying it to the control unit 9-0.

The high speed transmission / reception unit 8-0 and the MUX unit 6-0 and D
It is provided between the MUX unit 7-0 and the high-speed transmission line 0 and has a bidirectional conversion function between an optical signal on the high-speed transmission line 0 and an electric signal in the device. Further, it has a function of monitoring a signal input from the high-speed transmission line 0 and notifying the control unit 9-0 of the input abnormality when an abnormality is detected, and a function of notifying an opposite device of the input abnormality through the high-speed transmission line 0. Have. Furthermore, the control unit 9-0
It has a function of stopping the optical output to the high-speed transmission line 0 in accordance with the output control signal input from.

The control unit 9-0 is a low speed transmission / reception unit 5-0-1.
5-0-4, high-speed transmission / reception unit 8-0, and DMUX unit 7-0 are monitored for abnormal input signals, and low-speed transmission / reception unit 5-0-1
˜5-0-4 output control and high-speed transmission / reception unit 8-0 output control.

Each of the multiplexers 103-105 has
It is configured in the same manner as the multiplexer 102, and the low-speed transmission / reception unit 5-in each of the multiplexers 103 to 105-
1-1 to 5-1-4, 12-0-1 to 12-0-4, 12-1-
Reference numerals 1 to 12-1-4 correspond to the low speed transmission / reception units 5-0-1 to 5-0-4 in the multiplexer 102. Also, the multiplexing device 1
MUX section 6-1 and 10- in each of 03 to 105
0, 10-1, DMUX section 7-1, 11-0, 11-1, high speed transmission / reception section 8-1, 14-0, 14-1 and control section 9-
1, 13-0 and 13-1 are respectively provided in the multiplexer 102.
It corresponds to the MUX unit 6-0, the DMUX unit 7-0, the high speed transmission / reception unit 8-0, and the control unit 9-0.

Low-speed transmission / reception section 5 in multiplexer 103
-1-1 to 5-1-4 are low-speed transmission lines 1a-1 to
4a-1 via the low-speed transmission / reception unit 4-1 of the switching device 101
1 to 4-4-1-4, and in the multiplexer 103, M
The optical signal on the low-speed transmission lines 1a-1 to 4a-1 and the multiplexer 10 are connected to the UX unit 6-1 and the DMUX unit 7-1.
It has a bidirectional conversion function with the electric signal in 3. Further, the signals input from the low-speed transmission lines 1a-1 to 4a-1 are monitored, and when an abnormality such as a signal input interruption for a predetermined time or more is detected, the control unit 9-1 is notified of the abnormality of the input signal. further,
It has a function of stopping the optical output to the low-speed transmission lines 1a-1 to 4a-1 according to the output control signal input from the control unit 9-1.

The MUX unit 6-1 is a low speed transmission / reception unit 5-1-1.
The signals input from ˜5-1-4 are multiplexed and output to the high speed transmission / reception unit 8-1. It also has a function of inserting a transmission path abnormality detection pattern indicating the above for each channel in accordance with an instruction from the control unit 9-1.

The DMUX unit 7-1 separates the signal input from the high speed transmission / reception unit 8-1 into channel units and outputs the separated signals to the low speed transmission / reception units 5-1-1 to 5-1-4 of the corresponding channel. Further, it has a function of detecting a transmission path abnormality detection pattern indicating an abnormality of each channel and notifying it to the control unit 9-1.

The high-speed transmission / reception unit 8-1 includes the MUX unit 6-1 and D.
It is provided between the MUX unit 7-1 and the high-speed transmission line 1 and has a bidirectional conversion function between an optical signal on the high-speed transmission line 1 and an electric signal in the device. Further, a function of monitoring a signal input from the high-speed transmission line 1 and notifying the control unit 9-1 of the input abnormality when an abnormality such as a signal input disconnection for a predetermined time or more is detected, and a high-speed transmission line to the opposite device. 1 has a function of notifying an abnormal input. Further, it has a function of stopping the optical output to the high-speed transmission line 1 according to the output control signal input from the control unit 9-1.

The control unit 9-1 includes a low speed transmission / reception unit 5-1-1.
5-1-4, high-speed transmission / reception unit 8-1, and DMUX unit 7-1 are monitored for abnormal input signals, and low-speed transmission / reception unit 5-1-1
˜5-1-4 output control and high-speed transceiver 8-1 output control.

Low-speed transmission / reception section 1 in multiplexing apparatus 104
Each of 2-0-1 to 12-0-4 is a low-speed transmission line 1b-
Low-speed transmission / reception unit 1 of switching device 106 via 0-4b-0
It is connected to 4-0-1 to 14-0-4, and is connected to the MUX unit 11-0 and the DMUX unit 10-0 in the multiplexer 104, and is connected to the low speed transmission lines 1b-0 to 4b-0. It has a bidirectional conversion function between the above optical signal and the electric signal in the multiplexer 104. Further, the signals input from the low-speed transmission lines 1b-0 to 4b-0 are monitored, and when an abnormality such as a signal input interruption for a predetermined time or more is detected, the control unit 13-0 is notified of the abnormality of the input signal. Further, it has a function of stopping the optical output to the low speed transmission lines 1b-0 to 4b-0 according to the output control signal inputted from the control unit 13-0.

The MUX unit 11-0 is a low speed transmission / reception unit 12-0.
The signals input from -1 to 12-0-4 are multiplexed and output to the high speed transmission / reception unit 14-0. It also has a function of inserting a transmission path abnormality detection pattern indicating the above for each channel in accordance with an instruction from the control unit 13-0.

The DMUX unit 10-0 includes a high speed transmission / reception unit 14-
The signal input from 0 is separated into channel units and output to the low-speed transmission / reception units 12-0-1 to 12-0-4 of the corresponding channel. Further, it has a function of detecting a transmission path abnormality detection pattern indicating an abnormality of each channel and notifying it to the control unit 13-0.

The high speed transmission / reception unit 14-0 is the MUX unit 11-0.
Is provided between the DMUX unit 10-0 and the high-speed transmission line 0 and has a bidirectional conversion function between an optical signal on the high-speed transmission line 0 and an electric signal in the device. Further, a function of monitoring a signal input from the high-speed transmission line 0 and notifying the control unit 13-0 of the input abnormality when an abnormality such as a signal input disconnection for a predetermined time or more is detected, and a high-speed transmission line to the opposite device. It has a function of notifying an input abnormality through 0. Further, it has a function of stopping the optical output to the high-speed transmission line 0 according to the output control signal input from the control unit 13-0.

The control unit 13-0 includes a low speed transmission / reception unit 12-0-
1-12-0-4, high-speed transmission / reception unit 14-0, and DMUX unit 1
It has a function of monitoring an input abnormal signal input from 0-0 and controlling the output of the low-speed transmitting / receiving sections 12-0-1 to 12-0-4 and the high-speed transmitting / receiving section 14-0.

Low-speed transmission / reception section 1 in multiplexer 105
Each of 2-1-1 to 12-1-4 is a low-speed transmission line 1b-
Low-speed transmission / reception unit 1 of switching device 106 via 1-4b-1
4-1-1 to 14-1-4, and in the multiplexer 105, is connected to the MUX unit 11-1 and the DMUX unit 10-1, and is connected to the low speed transmission lines 1b-1 to 4b-1. It has a bidirectional conversion function between the above optical signal and the electric signal in the multiplexer 105. Further, the signals input from the low-speed transmission lines 1b-1 to 4b-1 are monitored, and if an abnormality such as a signal input interruption for a predetermined time or more is detected, the control unit 13-1 is notified of the abnormality of the input signal. Further, it has a function of stopping the optical output to the low speed transmission lines 1b-1 to 4b-1 according to the output control signal input from the control unit 13-1.

The MUX unit 11-1 is a low speed transmission / reception unit 12-1.
The signals input from -1 to 12-1-4 are multiplexed and output to the high speed transmission / reception unit 14-1. It also has a function of inserting a transmission path abnormality detection pattern indicating the above for each channel in accordance with an instruction from the control unit 13-1.

The DMUX unit 10-1 includes a high speed transmission / reception unit 14-
The signal input from 1 is separated into channel units and output to the low speed transmission / reception units 12-1-1 to 12-1-4 of the corresponding channel. It also has a function of detecting a transmission path abnormality detection pattern indicating an abnormality of each channel and notifying it to the control unit 13-1.

The high speed transmission / reception unit 14-1 is the MUX unit 11-1.
Is provided between the DMUX unit 10-1 and the high-speed transmission line 1 and has a bidirectional conversion function between an optical signal on the high-speed transmission line 1 and an electric signal in the device. Further, a function of monitoring a signal input from the high-speed transmission line 1 and notifying the control unit 13-1 of an input abnormality when an abnormality such as a signal input disconnection for a predetermined time or longer is detected, and a high-speed transmission line to the opposite device. 1 has a function of notifying an abnormal input. Further, it has a function of stopping the optical output to the high-speed transmission line 0 according to the output control signal input from the control unit 13-1.

The control unit 13-1 includes a low speed transmission / reception unit 12-1-
1-12-12-4, high-speed transmission / reception unit 14-1, and DMUX unit 1
It has a function of monitoring an input abnormal signal input from 0-1 and controlling the output of the low speed transmission / reception units 12-1-1 to 12-1-4 and the high speed transmission / reception unit 14-1.

Next, the operation of this embodiment will be described.

First, in the system of this embodiment, the multiplexers 102 and 104 are used as the active system, and the multiplexers 101 and 10 are used.
The operation in the case where 3 is operating as a standby system will be described.

In FIG. 1, when the high-speed transmission / reception unit 9-0 detects an abnormality in the transmission line, the low-speed transmission / reception unit 12-0-1 to 12-0-4 is notified through the control unit 13-0 to inform the low-speed transmission line 1b.
-Stop the optical output to 0-4b-0, low-speed transceiver 14-
0-1 to 14-0-4 detects a transmission line abnormality, and the control unit 18
The selection system of the SEL units 15-1 to 15-4 is changed from 0 system to 1 system. Also, the low-speed transceiver 14-0-1
By notifying the optical output of 14-0-4 to 14-0-4, the transmission path abnormality is notified in the opposite direction, so that the low-speed transmission / reception units 4-0-1 to 4-0-4 of the switching device 101 also have the transmission path abnormality. Is detected and the selection system of the SEL units 3-1 to 3-4 is changed from the 0 system to the 1 system by the control of the control unit 5, so that the bidirectional transmission path is switched from the 0 system to the 1 system. .

The specific operation of each unit is as follows.

In the normal state, the optical signal input from the low speed transmission line 1a is converted into an electric signal by the low speed transmission / reception unit 1-1, and then copied by the COPY unit 2-1 to obtain the low speed transmission / reception unit 4-0-1. , 4-1-1 is converted into an optical signal and then output to the low speed transmission line 1a-0 of the working system and the low speed transmission line 1a-1 of the standby system. The work of distributing the optical signal from the low speed line to the low speed transmission line 1a-0 of the active system and the low speed transmission line 1a-1 of the standby system is performed for each of the low speed lines 1a to 4a.

In the multiplexers 102 and 103, the data of the low speed transmission lines are multiplexed by the MUX units 6-0 and 6-1 and output to the high speed transmission line 0 and the high speed transmission line 1. The multiplexed data is demultiplexed by the multiplexers 104 and 105 into data for each low-speed transmission path and output to the low-speed transmission paths 1b-0 and 1b-1.

The optical signal input from the low speed line 1a receives low speed transmission / reception units 14-0-1 and 14-1-1 in the switching device 106.
Is input to the SEL unit 15-1 and the data is transferred to the SEL unit 15-1.
Therefore, the SEL unit 15-1 is controlled so as to select the data input from the low-speed transmission / reception unit 14-0-1 via these multiplexing devices. The output of the SEL unit 15-1 is transferred to the low speed transmission / reception unit 17-1, and the low speed transmission / reception unit 17-1
At 1, it is converted into an optical signal and output to the low speed line 1b. Similarly, for the data in the reverse direction, the data is duplicated by the copy unit 16-1 and multiplexed by the multiplexers 104, 102 and 105, 103.
Through the low-speed transmission / reception unit 4-0-1, 4-
It is input to 1-1. Those data are SEL section 3-1
Input to the low-speed transmission / reception unit 4 under the control of the control unit 5.
-The data input from 0-1 is selected and the low speed line 1
is output to a. As described above, bidirectional communication between the low speed line 1a and the low speed line 1 becomes possible.

Next, the operation when a failure occurs in the high speed transmission line 0 in the direction from the multiplexer 102 to the multiplexer 104 in the normal state will be described.

When a failure occurs in the high-speed transmission line 0, which is the operating system in the direction from the multiplexer 102 to the multiplexer 104, the high-speed transmission / reception unit 14-0 of the multiplexer 104 detects an input abnormality and performs control. Notify the department 13-0. Further, by stopping the optical output to the high-speed transmission line 0 (or adding the input abnormality notification signal to the output signal), the multiplexer 10
2 is notified of an input abnormality through the transmission line 0. The control unit 13-0 notified of the input abnormality, the low-speed transmission / reception unit 12-0-1
~ 12-0-4 is instructed to stop the output, and in response to this, the low-speed transmission / reception units 12-0-1 to 12-0-4 set the low-speed transmission line 1b-0 to
Stop light output to 4b-0.

Low-speed transmission / reception unit 14-0-1 of switching device 106
14-0-4, an input abnormality is detected by stopping the optical output to the low-speed transmission lines 1b-0 to 4b-0, and the control unit 18 is notified. The control unit 18 includes a low speed transmission / reception unit 14-0-1 to 14-
When the input abnormality is notified from 0-4, the low speed transmission / reception unit 14-
The SEL units 15-1 to 15-4 are instructed to switch the selected system to the 1 system after waiting for the input abnormality not to be notified from the 1-1 to 14-1-4 within a fixed time. S
The EL units 15-1 to 15-4 transmit the data to be output according to the instruction of the control unit 18 to the low-speed transmission / reception units 14-0-1 to 14-14.
-Low-speed transmission / reception unit 14-1-1 to 0-4 based on input data from 0-4
Switch to the input data from 14-1-4.

In the multiplexer 102, the high speed transmission / reception unit 8-0, which recognizes the stop of the optical input from the high speed transmission line 0 (or the notification of the input abnormality from the high speed transmission / reception unit 14-0), is controlled by the control unit 9-0. Is notified of an output abnormality. The control unit 9-0
By the output abnormality notification from the high speed transmission / reception unit 8-0, the low speed transmission / reception units 5-0-1 to 5-0-4 are instructed to stop the output. The low speed transmission / reception units 5-0-1 to 5-0-4 stop the optical output of the low speed transmission lines 1a-0 to 4a-0 in response to the output stop instruction. As a result, the transmission line abnormality is notified to the low-speed transmission / reception units 4-0-1 to 4-0-4 of the destination switching device 101.

In the switching device 101, the low speed transmission / reception section 4-0-
An input abnormality is detected in 1 to 4-0-4, and the control unit 5 is notified. When the control unit 5 is notified of an input abnormality by the low speed transmission / reception units 4-0-1 to 4-0-4, the low speed transmission / reception units 4-1-1 to 4-4.
After waiting for the input abnormality not to be notified from -1-4 within a certain time, the SEL units 3-1 to 3-4 are instructed to change the selected system from 0 system to 1 system. SEL section 3-1 to 3-1
3-4 outputs the output data according to the instruction of the control unit 5, from the input data from the low-speed transmission / reception units 4-0-1 to 4-0-4 to the low-speed transmission / reception units 4-1-1 to 4-1-4. Switch to input data.

As described above, when the fault occurs in the high speed line 0a, the transmission line is switched by changing the operating system from the 0 system to the 1 system.

Next, the operation when a failure occurs in the low speed transmission line 1a-0 in the direction from the switching device 101 to the multiplexing device 102 in the normal state will be described.

When a failure occurs in the low speed transmission line 1a-0 in the direction from the switching device 101 to the multiplexer 102, the multiplexer 102 detects an input abnormality in the low speed transmission / reception section 5-0-1, and the input abnormality occurs. To the control unit 9-0. When the control unit 9-0 is notified of the input abnormality from the low-speed transmission / reception unit 5-0-1, it instructs the MUX unit 6-0 to generate and insert the input abnormality detection pattern of the corresponding channel. In response to this instruction, the MUX unit 6-0 inserts the input abnormality detection pattern instead of the data of the corresponding channel,
It is multiplexed with data of other channels and transmitted to the multiplexer 104.

In the multiplexer 104, the input abnormality detection pattern inserted in the MUX section 6-0 is the DMUX section 10-0.
Detected in. The DMUX unit 10-0 notifies the control unit 13-0 of the abnormality of the corresponding channel. The control unit 13-0 outputs an output stop instruction to the low speed transmission / reception unit 12-0-1. The low-speed transmission / reception unit 12-0-1 stops the optical output to the low-speed transmission line 1b-0 and notifies the switching device 106 of a transmission line abnormality of the corresponding channel.

Low-speed transmission / reception unit 14-0-1 of switching device 106
When detecting a transmission line abnormality, notifies the control unit 18 of the transmission line abnormality of the corresponding channel. The control unit 18 outputs an output stop instruction to the low speed transmission / reception unit 14-0-1, and the low speed transmission / reception unit 1
After waiting for a certain period of time without a transmission line abnormality notification being input from 4-1-1, the switching instruction is output from the low-speed transmission / reception unit 14-1-0 to the SEL unit 15-1 to the low-speed transmission / reception unit 14-1-1. SE
The L unit 15-1 switches the data selection system from the 0 system to the 1 system according to the switching instruction from the control unit 18. When the low speed transmission / reception unit 14-0-1 receives the output stop instruction from the control unit 18, it stops the optical output and notifies the multiplexer 104 of the transmission path abnormality.

Low-speed transmission / reception unit 12-0- of the multiplexer 104
When detecting an abnormality in the transmission line from the low-speed transmission / reception unit 14-0-1, the communication unit 1 notifies the control unit 13-0 to that effect, and the control unit 13-
0 notifies the MUX unit 11-0 of the instruction to insert the transmission path abnormality detection pattern. The MUX unit 11-0 inserts the transmission path abnormality detection pattern in place of the data of the corresponding channel, and transmits it to the multiplexer 102 through the high speed transmission / reception unit 14-0.

When the DMUX unit 7-0 of the multiplexer 102 detects the transmission line abnormality detection pattern inserted in the transmission line abnormality channel, it notifies the control unit 9-0 of the transmission line abnormality of the corresponding channel. The control unit 9-0, which has received the notification,
The low speed transmission / reception unit 5-0-1 is instructed to stop the output, and the low speed transmission / reception unit 5-0-1 stops the optical output to the low speed transmission line 1a-0.

Low-speed transmission / reception unit 4-0-1 of switching device 101
Detects a transmission line abnormality and notifies the control unit 5 of the transmission line abnormality. The control unit 5 receives the transmission line abnormality notification from the low speed transmission / reception unit 4-1-1, which is the backup transmission line, until a certain time elapses after receiving the transmission line abnormality notification from the low speed transmission / reception unit 4-0-1. After waiting for the failure, the SEL unit 3-1 is instructed to switch to the standby system. The SEL unit 3-1 selects a system from 0 to 1
Switch to the system. In this way, the 0-system transmission line is switched to the 1-system transmission line when a transmission line abnormality occurs in the direction from the switching device 101 to the multiplexing device 104.

The high-speed transmission line is SONET (Synchronous Opt)
icalNetwork) / SDH (Synchronous Digital Hierarchy)
In this case, the alarm transfer function of SONET / SDH can be used. Even if a relay device is installed in the high-speed transmission line, the alarm transfer function of SONET / SDH can transfer the alarm to the opposite device.

FIG. 2 is a block diagram showing the configuration of the second embodiment of the present invention, and the second embodiment of the present invention will be described below with reference to FIG.

In this embodiment, as shown in FIG. 2, the switching devices 101 'and 106' are different in internal configuration from the switching devices 101 and 106 in the first embodiment shown in FIG. . In this embodiment, the switching devices 101 ′, 1
Among the components of 06 ', the low speed transmission / reception section 1-1' to 1-
4 ', 4-0-1' to 4-0-1 ', 4-1-1' to 4-1-
4 ', 17-1' to 17-4 ', 14-0-1' to 14-0-
1 ', 14-1-1' to 14- 1-4 'and control unit 5',
Each of 18 'is the switching device 101, 1 shown in FIG.
The operation of the 06 component to the outside is performed by the low-speed transmission / reception unit 1.
-1 to 1-4, 4-0 to 1 to 4-0, 4-1 to 4-1 to 4-1-
4,17-1 to 17-4,14-0-1 to 14-0-1,14
It is similar to -1-1 to 14- 1-4 and the control units 5 and 18. Therefore, only the internal operation of each switching device 101 ', 106' will be described below.

In the present embodiment, the low speed transmission / reception units 1-1 'to 1-4' and the low speed transmission / reception unit 4-0- of the switching device 101 '.
The switch unit 20 is provided between 1 ′ to 4-0-1 ′ and 4-1-1 ′ to 4-1-4 ′, and the low speed transmission / reception units 17-1 ′ to 17-4 ′ of the switching device 106 ′. And low speed transceiver 14-0-1 '
A switch unit 21 is provided between 14-0-1 'and 14-1-1' to 14-1-1 '.

The switch units 20 and 21 in this embodiment
Is a switch that has 12 ports of input and output, and any output port is not affected by other output ports, and one port can be selected from all the input ports. It is selected by the selection instruction from the control unit 5 ′. You can change the port to use.

In the initial state, the switch units 20 and 21 have an input port 5 at the output port 1, an input port 6 at the output port 2, an input port 7 at the output port 3, an input port 8 at the output port 4, and an input port at the output port 5. Port 1, output port 6
To input port 2, output port 7 to input port 3, output port 8 to input port 4, output port 9 to input port 1,
The input port 2 is connected to the output port 10, the input port 3 is connected to the output port 11, and the input port 4 is connected to the output port 12.

In the normal state, the data inputted from the low speed transmission line 1a is converted into an electric signal by the low speed transmission / reception unit 1-1 'and then copied by the switch unit 20 to obtain the low speed transmission / reception unit 4-0-1'. , 4-1-1 'to low-speed transmission line 1a-0, 1
It is output to a-1. It is multiplexed with the data of other low speed transmission lines by the multiplexers 102 and 103 and output to the high speed transmission line 0 and the high speed transmission line 1. After this, the multiplexers 104, 1
At 05, it is separated from the data of the other low speed transmission lines and is output to the low speed transmission lines 1b-0 and 1b-1. Low-speed transceiver 14
-The data input to 0-1 'and 14-1-1' is transferred to the switch unit 21, but the data input from the low speed transmission / reception unit 14-0-1 'is selected and output to the low speed line 1b. To be done. Similarly, the data in the reverse direction is duplicated by the switch unit 21, and the low-speed transmission / reception units 4-0-1 'and 4-1-1 of the switching device 101 are duplicated through the multiplexers 104 and 102 and the multiplexers 105 and 103. 'Is entered. The data is input to the switch unit 20, but the low speed transmission / reception unit 4-
The data input from 0-1 'is selected and output to the low speed line 1a. In this way, bidirectional communication between the low speed line 1a and the low speed line 1 becomes possible.

Next, the operation of the present embodiment when a failure occurs in the high speed transmission line 0 in the direction from the multiplexer 102 to the multiplexer 104 in the normal state will be described.

When a failure occurs in the high speed transmission line 0 in the direction from the multiplexer 102 to the multiplexer 104, the high speed transmission / reception unit 14-0 of the multiplexer 104 detects an input abnormality,
Notify the control unit 13-0. Further, by stopping the optical output to the high-speed transmission line 0 (or adding the input abnormality notification signal to the output signal), the multiplexer 102 is notified of the input abnormality through the high-speed transmission line 0.

The control unit 13-0 of the multiplexer 104, which has been notified of the input abnormality, controls the low speed transmission / reception units 12-0-1 to 12-0-.
Instruct 4 to stop output. Low-speed transceiver 12-0-1
When the control unit 13-0 instructs the 2-0-4 to stop the output, the 2-0-4 stops the optical output to the low-speed transmission lines 1b-0 to 4b-0, so that the low-speed transmission of the switching device 106 'of the transmission destination is stopped. The transmission / reception units 14-0-1 to 14-0-4 are notified of an abnormality in the transmission path.

Low-speed transmission / reception unit 14-0- of the switching device 106 '
1'to 14-0-4 'detects an input abnormality, and the control unit 18'
Will be notified. The control unit 18 'includes a low speed transmission / reception unit 14-0-
When the input abnormality is notified from 1 ′ to 14-0-4 ′, the switch waits until the input abnormality is notified from the low speed transmission / reception unit 14-1-1 ′ to 14-1-4 ′ within a certain time. Part 2
The output ports 1 to 4 of No. 1 are instructed to change the selected ports to the input ports 9 to 12. Switch part 21
The output data of the output ports 1 to 4 according to the instruction of the control unit 18 'from the data of the low speed transmission / reception units 14-0-1' to 14-0-4 'to the low speed transmission / reception units 14-1-1' to 14-. Switch to 1-4 'data.

On the other hand, in the multiplexer 102, the high speed transmission / reception section 8-0 notified of the input abnormality notifies the control section 9-0 of the output abnormality. The control unit 9-0 instructs the low-speed transmission / reception units 5-0-1 to 5-0-4 to stop the output by the output abnormality notification. Low-speed transmission / reception unit 5-0-1 to 5-0-4
Is a low speed transmission line 1a-0 to 4a-0 according to the output stop instruction.
Of the destination switching device 10 by stopping the optical output of
1'is notified to the low speed transmission / reception units 4-0-1 'to 4-0-4' of the abnormality of the transmission path.

Low-speed transmission / reception section 4-0- of the switching device 101 '
An input abnormality is detected in 1'to 4-0-4 'and the control unit 5'is notified. The control unit 5'includes the low-speed transmission / reception unit 4-0-1 '
When the input abnormality is notified from the 4-0-4 ', the low-speed transmission / reception units 4-1-1' to 4-1-4 'wait for the input abnormality not to be notified within a certain time, and then the switch unit 20 The output ports 1 to 4 are instructed to change the selected port to the input ports 9 to 12. The switch unit 20 includes a control unit 5 ′.
Output data according to the instruction of low-speed transmission / reception unit 4-0-1 '~
Low-speed transmitting / receiving unit 4-1-1 'to 4--0-4' data
Switch to 1-4 'data.

As described above, when a failure occurs in the high-speed line 0a, the transmission line is switched by changing the operating system from the 0-system transmission line to the 1-system transmission line.

Next, the operation of the present embodiment when a failure occurs in the low speed transmission line 1a-0 in the direction from the switching device 101 'to the multiplexer 102 in the normal state will be described.

When a failure occurs in the low speed transmission line 1a-0 in the direction from the switching device 101 'to the multiplexing device 102, the low speed transmission / reception section 5-0-1 detects an input abnormality and notifies the control section 9-0. To do. When the input abnormality is notified from the low-speed transmission / reception unit 5-0-1, the control unit 9-0 instructs the MUX unit 6-0 to generate and multiplex the input abnormality detection pattern of the corresponding channel. The MUX unit 6-0 inserts the input abnormality detection pattern in place of the data of the corresponding channel and multiplexes it with the data of other channels. The input abnormality detection pattern inserted by the MUX unit 6-0 is transmitted to the multiplexing device 104.

The DMUX unit 10-0 of the multiplexer 104 detects the input abnormality detection pattern. DMUX section 10-
0 notifies the control unit 13-0 of the abnormality of the corresponding channel. The control unit 13-0 outputs an output stop instruction to the low speed transmission / reception unit 12-0-1. The low-speed transmission / reception unit 12-0-1 notifies the switching device 106 'of a transmission line abnormality of the corresponding channel by stopping the optical output to the low-speed transmission line 1b-0.

Low-speed transmission / reception unit 14-0- of the switching device 106 '
When detecting the transmission path abnormality, 1'notifies the control unit 18 'of the transmission path abnormality of the corresponding channel. The control unit 18 'outputs an output stop instruction to the low-speed transmission / reception unit 14-0-1', waits for a certain period of time without a transmission line abnormality notification being input from the low-speed transmission / reception unit 14-1-1 ', and then switches the switch unit 21'. The output port 1 is instructed to change the selected port to the input port 9. The switch unit 21 switches the selected port of data according to an instruction from the control unit 18 ′. Low speed transceiver 1
When the 4-0-1 'receives the output stop instruction from the control section 18', it stops the optical output to notify the multiplexer 104 of the transmission path abnormality.

Low-speed transmission / reception unit 12-0- of the multiplexer 104
1 notifies the control unit 13-0 when a transmission line abnormality is detected, and the control unit 13-0 notifies the MUX unit 11-0 of an instruction to insert a transmission line abnormality detection pattern. The MUX unit 11-0 inserts the transmission path abnormality detection pattern in place of the data of the corresponding channel, and the multiplexer 1 through the high speed transmission / reception unit 14-0.
Send to 02.

The DMUX unit 7-0 of the multiplexer 102 is
When the transmission line abnormality detection pattern and the transmission line abnormality channel are detected, the control unit 9-0 is notified of the transmission line abnormality of the corresponding channel. The control unit 9-0 instructs the low-speed transmission / reception unit 5-0-1 to stop the output. The low-speed transmission / reception unit 5-0-1 uses the low-speed transmission line 1a.
-Stop light output to 0.

Low-speed transmission / reception section 4-0- of the switching device 101 '
1'detects a transmission line abnormality and notifies the control unit 5'of the transmission line abnormality. The control unit 5 ′ receives the transmission path abnormality notification from the low-speed transmission / reception unit 4-0-1 ′, and after a predetermined time elapses,
Waits for the transmission path abnormality notification not to be received from the low speed transmission / reception section 4-1-1 'which is the protection transmission path, and then instructs the output port 1 of the switch section 20 to change the selected port to the input port 9. To do. Output port 1 of switch unit 20
From the data of the low-speed transceiver 4-0-1 to the low-speed transceiver 4
-Switch to 1-1 data. In this way, the 0-system transmission path is switched to the 1-system transmission path when a transmission path abnormality occurs in the direction from the switching apparatus 101 ′ to the multiplexing apparatus 104.

FIG. 3 shows an example of use of the system according to the above-mentioned embodiment.
It is an example of a system that accommodates two users of the transmission line unification service.

The users of the redundant transmission line service (users using the low speed lines 1a to 3a and the low speed lines 1b to 3b) are accommodated in the multiplexing device via the switching devices 101 'and 104', and the single transmission line service is provided. Users (low speed line 4
(Users using a, 5a, 4b, 5b) are directly accommodated in the multiplexer without going through the switching device. Specifically, the low speed lines 4a, 5a, 4b, 5b are connected to the low speed transmission / reception units 5-0-4, 5-1-4, 12-0-4, 12-1-4. The other structure is similar to that of the embodiment shown in FIG. Such a configuration is similarly applicable to the first embodiment shown in FIG.

The user of the redundant transmission line service can avoid the failure of either the transmission line of the 0 system or the transmission line of the 1 system, but the user of the redundant transmission line service stops the service due to the failure of the transmission line to which the service belongs. However, in consideration of this, the service can be provided at a lower cost than the redundant line service.

[0105]

Since the present invention is constructed as described above, the following effects can be obtained.

The first effect is to duplicate the relay transmission line in a communication system using a data communication protocol in which an alarm transfer function is not defined, such as Ethernet,
By switching the transmission line in a short time when a failure occurs,
It is possible to improve reliability.

The reason is that when a failure in the transmission path is detected, the failure occurrence is notified to the downstream side and the upstream side of the communication by using the transmission path. Also, as a notification method,
Another reason is that failure can be detected in a short time by using the method of stopping the optical output to the transmission path in each device.

The second effect is that flexible services can be provided and the device can be effectively used.

The reason is that since the switching function of the transmission line duplication is divided from the multiplexing device, the line of the user who uses the transmission line duplication service is connected to the multiplexing device through the switching device, This is because the number of users accommodated as a system can be increased by directly connecting the line of the user who does not use the duplex service (single service) to the multiplexer. For example, if there is a multiplexer that multiplexes four channels, and the number of users of the redundant transmission line service is 3, the total number of users of the redundant transmission line service or the simplex service is the multiplexing system in which the switching function is integrated. There are 4 users and 5 users in a system in which the switching function is divided. (FIG. 3) The third effect is that the switching device can be connected to devices of various communication protocols.

The reason is that the switching device does not depend on the communication protocol and the transmission medium because the switching is performed by detecting the disconnection of the optical or electric signal.

The fourth effect is that it is possible to avoid obstacles at a plurality of locations.

The reason is that the switching device accommodates a plurality of lines, but since each line can be switched independently, a double failure can be relieved. For example, when a failure occurs in the low speed transmission line 1a-0 and the low speed line 1a operates in the 1-system, the low speed transmission line 2a
-Low speed line 2a is 0 even if failures occur on the 1 side at the same time
By operating in the system, it is possible to continue operation without disconnecting the line.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a block diagram showing a usage example of the second embodiment.

[Explanation of symbols]

101,102 Switching device 1-1 to 1-4, 4-0-1 to 4-0-4, 4-1 to 4-1-4-1-
4,17-1 to 17-4,14-0-1 to 14-0-4,14
-1-1 to 14-1-4 Low speed transmission / reception unit 1a to 4a, 1b to 4b Low speed line 1a-0 to 4a-0, 1a-1 to 4a-1 Low speed transmission line 2-1 to 2-4, 15- 1 to 15-4 COPY section 3-1 to 3-4, 16-1 to 16-4 SEL section 5, 18 control section 5-0-1 to 5-0-4, 5-1 to 5-1 -4,12-0-1
To 12-0-4, 12-1-1 to 12-1-1-4 low speed transmission / reception unit 6-0, 6-1, 10-0, 10-1 MUX unit 7-0, 7-1, 11-0, 11-1 DMUX section 8-0, 8-1, 14-0, 14-1 High speed transmission / reception section 9-0, 9-1, 13-0, 13-1 Control section 102-105 Multiplexing device

Claims (5)

[Claims] 1. A switching device for duplicating data of a plurality of transmission lines and distributing the data to an active transmission line and a standby transmission line, and a switching device provided for each of the active transmission line and the standby transmission line. A multiplexing device for multiplexing data transmitted through a plurality of transmission lines distributed from the switching device, and a transmission line duplication system of a multiplexing communication device, wherein each of the switching device and the multiplexing device A multiplex communication apparatus characterized in that a control section is provided, and each control section cooperates with each other to switch the transmission path from the active system to the standby system when detecting a transmission path failure due to disconnection of a data signal transmitted through each transmission path. Redundant transmission line system. 2. The redundant transmission line system of the multiplex communication device according to claim 1, wherein the multiplex device multiplexes a plurality of low-speed transmission / reception units connected to the switching device and data received by the low-speed transmission / reception unit. A multiplexing unit for multiplexing, a high-speed transmitting / receiving unit for transmitting the multiplexed data multiplexed by the multiplexing unit to another opposing multiplexing device, and an opposing multiplexing device received by the high-speed transmitting / receiving unit And a control unit that controls the operation of each unit, and each of the low-speed transmission / reception unit and the high-speed transmission / reception unit includes a switching device and an opposing device. If the signal input from the transmission line connected to the provided multiplexing device is disconnected for a predetermined time or longer, it is notified as an input error to the control unit and the signal output is stopped, and the control receiving the notification is performed. Is GLS system multiplex communication apparatus characterized by stopping the signal output of the low-speed transceiver or fast transceiver not receiving notifications. 3. The transmission line duplication system for a multiplexed communication device according to claim 1, wherein the switching device includes a plurality of first low-speed transmission / reception units respectively connected to a plurality of transmission lines, and the plurality of transmission lines. A plurality of second and third low-speed transmission / reception units, which are respectively provided in the transmission paths of the active system and the standby system and are connected to the multiplexer, corresponding to the first low-speed transmission / reception unit, the first low-speed transmission / reception unit, and the first low-speed transmission / reception unit. 2nd and 3rd
Is provided between the low-speed transmitting / receiving unit and the low-speed transmitting / receiving unit, the data from the first low-speed transmitting / receiving unit is copied and sent to the second and third low-speed transmitting / receiving units. It comprises a duplication selection unit that selects any one and sends it to the first low-speed transmission / reception unit, and a control unit that controls the operation of each unit, and the second and third low-speed transmission / reception units are connected to a multiplexing device. When the signal input is disconnected from the transmission line for a predetermined time or longer, the control unit is notified of the input abnormality, and the control unit having received the notification informs the duplication selection unit to the second
When the data from the low-speed transmitting / receiving unit is selected and the input abnormality is notified from the second low-speed transmitting / receiving unit, the input abnormality notification is not received from the third low-speed transmitting / receiving unit for a predetermined time or longer. After confirming the above, the duplication selection unit is caused to select the data from the third low-speed transmission / reception unit, and the transmission line duplication system of the multiplex communication device. 4. The redundant transmission line system of the multiplex communication device according to claim 3, wherein the copy selection unit copies the data from the first low-speed transmission / reception unit and sends it to the second and third low-speed transmission / reception units. And a selecting unit for selecting one of the data from the second and third low-speed transmitting / receiving units and transmitting it to the first low-speed transmitting / receiving unit. 5. The transmission line duplication system according to claim 3, wherein the duplication selection unit is a switch having a plurality of input / output ports.