JP3494222B2 - Multiple signal transmission system with remote management function - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission path of a management information signal in a multiplex signal transmission system used in a network, and more particularly to improvement of a path selection function when a failure occurs on the transmission path.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing the structure of a conventional multiple signal transmission system. As an example of such a multiple signal transmission system, the home page URL (h
ttp: //www2.hitachiable.co.jp/apps/infonet.nsf/c12f
cab077019d46492564d5002a461a / b19f35bcc96cac9549256
8f70028b951), which includes the Gigabit Ethernet multiplex long-distance transmission device “GMX”.

The multiple signal transmission system 1 incorporates first to fourth low-order signal termination circuits 6a to 6d to terminate low-order signals input / output to / from the outside. The first and second low-order signal termination circuits 6a and 6b are connected to the first signal demultiplexing circuit 2A, and the third and fourth low-order signal termination circuits 6c and 6d are connected to the second signal demultiplexing circuit 2B. In the signal demultiplexing circuits 2A and 2B, each low-order signal is demultiplexed or demultiplexed (referred to as "demultiplexing").

The input / output interfaces on the network 8 side of the first signal demultiplexing circuit 2A and the second signal demultiplexing circuit 2B are optical signals, and the first signal demultiplexing circuit 2A is used.
Between the input / output of the second signal demultiplexing circuit 2B and the multiplexed signal transmission line 7 connected to the network 8, the WDM multiplexer 13 demultiplexes the optical signal.

The multiple signal transmission system 1 further contains a remote management agent 5, and the management information signal of the remote management agent 5 is transmitted to the remote management manager 9 through the network 8. In this case, in the case of the out-band method of transmitting the management information signal through a dedicated transmission line, the management information signal input / output port 12 has a configuration in which the transmission line 10 is directly connected to the network 8 (shown by a broken line in the figure). However, in the case of the in-band method in which the signal is transmitted through the multiplex signal transmission path 7, the configuration is such that the management information signal input / output port 12 temporarily returns to the low-order signal termination circuit inside the multiplex signal transmission system. In this case, the management information signal input / output port 12 for the remote management agent 5, which has a small amount of information, does not apply an unnecessary processing load to the signal processing CPU.
It has a low-speed specification such as Base-T, and the transmission capacity increases due to the spread of the Internet, and direct connection with a low-order signal terminating circuit that adopts 1G Ether or the like is impossible.

Therefore, the management information signal input / output port 1
The signal is first input from 2 to the low-order signal multiplexer 11, and converted into an interface connectable to the first low-order signal termination circuit 6a by the low-order signal multiplexer 11 and connected. Further, if the signal input to the first low-order signal termination circuit 6a is only the management information signal having a small amount of information, the first low-order signal termination circuit 6a
Since the band of 10 is wastefully used, another signal is input to the low-order signal multiplexer 11 and is input to the first low-order signal terminating circuit 6a after being multiplexed with the management information signal. Was.

[0007]

However, the configuration of the conventional multiple signal transmission system described above has the following problems.

First, in the case of transmitting the management information signal by the in-band method, when the failure occurs at a portion from the remote management agent 5 to the multiple signal transmission path 7, the management information signal cannot be transmitted, so that the remote management manager 9 side In that case, the state of the system could not be grasped at all, and even the location of the failure could not be identified.

Further, in the above-mentioned case, in order to transmit the management information signal, it is necessary to switch to the out-band system, but this requires the wiring from the management information signal input / output port 12 to the network to be redone, and It was necessary to dispatch personnel who knew the composition to the field. Further, in order to transmit the management information signal by the out-band method in order to avoid the above-mentioned problem, it is necessary to newly install the transmission path 10 for the management information signal.

(Object of the Invention) An object of the present invention is, in transmission of a management information signal by the in-band method, WDM demultiplexing which enables the transmission of the management information signal by the different transmission path even when a failure occurs. It is to provide a multiplex communication transmission system using.

Another object of the present invention is to secure a plurality of transmission paths in the transmission path of the in-band type management information so as to provide redundancy, and also to the out-band type without any complicated wiring change if desired. It is an object of the present invention to provide a multiplex signal transmission system using WDM demultiplexing, which is transferable and is capable of identifying a fault location from a remote management manager.

[0012]

A multiple signal transmission system with a remote management function according to the present invention is provided with a transmission path for a management information signal in at least two optical signals of a plurality of WDM optical signals. When a failure occurs in the signal transmission path, a path selection circuit is provided for transmitting the management information signal using the optical signal transmission path having no failure.

The multiplex signal transmission system with remote control function of the present invention includes a plurality of signal demultiplexing circuits for demultiplexing signals between low-order transmission rate signals and high-order transmission rate optical signals. In a multiplex signal transmission system with a remote management function, which comprises a signal multiplexer and a WDM multiplexer for connecting the plurality of signal multiplexers and a network and performing WDM demultiplexing of the optical signal, The signal multiplexer includes a remote management agent for collecting and managing management information signals and notifying them to a remote management manager at a remote location, an external management information signal input / output port for inputting / outputting management information signals, and a remote management agent. Between the remote management agent and the management information signal input / output port, or between the management information signal input / output port and the signal demultiplexing circuit. It characterized by having a a route selection circuit to allow for the selection of one of the connection between the.

The signal multiplexing device includes a plurality of low-order signal terminating circuits for terminating low-order transmission rate signals, at least one low-order signal terminating circuit, and the path selecting circuit and the signal demultiplexing circuit. And a low-order signal demultiplexing circuit for demultiplexing signals in the low-order signal demultiplexing circuit side interface speed and the low-order signal termination circuit. When the interface speed on the signal demultiplexing circuit side is different, it has a function of converting the interface speed of the remote management agent into the interface speed of the low-order signal termination circuit.

Further, in the multiple signal transmission system with the remote management function, by connecting the management information signal input / output ports of two signal multiplexers having a remote management agent, a plurality of transmission paths for the management information signal can be obtained. And the management information signal is multiplexed with a signal of a lower transmission rate by a first signal multiplexer having a remote management agent, or a management information signal input / output port of the first signal multiplexer. Output to the management information signal input / output port of the second signal multiplexer having a remote management agent, and is preferentially multiplexed with the management information signal of the second signal multiplexer, or Between the management information signal input / output ports of two signal multiplexers having a remote management agent, or 2 having a remote management agent
By connecting between the management information signal input / output port of one signal multiplexer and the network, a plurality of transmission paths for the management information signal are formed, and the management information signal is the first signal multiplex having a remote management agent. Management information of a second signal multiplexer which is multiplexed with a signal of a lower transmission rate in the multiplexer, or which is output from the management information signal input / output port of the first signal multiplexer and has a remote management agent. It is characterized in that it is input to the signal input / output port and is preferentially multiplexed with the management information signal of the second signal multiplexer, or is output to the network immediately after being output from the first signal multiplexer.

Further, the route selection circuit forms a plurality of transmission routes for the management information signal of the remote management agent, and if a failure occurs in communication on the current transmission route, it is immediately transferred to another transmission route. The remote management agent notifies the remote management manager of the occurrence of a failure and the transmission path used at this time by the management information signal, and then resets the management information signal transmission path under the control of the remote management manager. And

More specifically, a plurality of low-order signal terminating circuits for terminating low-order transmission rate signals and a high-order transmission rate signal are generated as optical signals by connecting to the low-order signal terminating circuits. A signal demultiplexing circuit, a remote management agent that collects and controls management information in the signal multiplexing device, and notifies the remote management manager at a remote place via a network, and a signal of the remote management agent enables selection of a plurality of routes. Further, when the interface speed on the signal demultiplexing circuit side and the interface speed on the signal demultiplexing circuit side of the low order signal termination circuit are different, the interface speed of the remote management agent is changed to the interface speed of the low order signal termination circuit. Selecting circuit for converting into a signal, and demultiplexing the signal from the route selecting circuit and one low-order signal terminating circuit and connecting to the signal demultiplexing circuit And a multiplexer for demultiplexing the input and output signals of the plurality of signal multiplexers by WDM demultiplexing, and the route selection circuit includes a management information signal of the remote management agent. Is connected to a low-order signal demultiplexing circuit or to the outside of the signal multiplexer.

Further, the management information signal of the remote management agent has a plurality of transmission paths, and is multiplexed with a signal of a lower transmission rate by the first signal multiplexing device incorporating the remote management agent, or The first signal is output from the first signal multiplexer including the management agent, input to the second signal multiplexer, multiplexed with the management information signal of the second signal multiplexer, and transmitted, or the first signal. It is characterized in that it is connected to the network immediately after being output from the multiplexer.

Further, the management information signal of the remote management agent has a plurality of transmission paths, and if a failure occurs in the communication on the current transmission path, another path is immediately switched to the remote management manager for failure. Is reported and the route used at this time is notified, and then the transmission route of the management information signal is reset under the control of the remote management manager.

The route selection circuit of the present invention is controlled by the remote management agent. When the remote management agent detects a failure in the transmission path of the management information signal, the remote management manager uses the path in which no failure has occurred to notify the remote management manager of the failure and the path used at this time (no failure has occurred). Notice. Since the route at this time is temporary, any route may be selected. The remote management manager notified of the occurrence of the failure notifies the remote management agent of a route that can be used stably after the failure by using the temporary route notified of the occurrence of the failure, and thereafter, the remote management manager and the remote management agent. The communication between the two is performed by the newly defined route. At this time, the remote management agent controls the route selection circuit to select the newly determined route. The route selection circuit can also select a route directly connecting to the network, that is, an out-band system.

Since the transmission path of the management information signal as described above can be automatically changed at the time of failure, the remote management agent can communicate with the remote management manager through the network even after recognizing that the failure has occurred. As the management information signal, the remote management manager can be notified of, for example, the content of an alarm raised in the system. Therefore, the remote management manager side can identify the faulty part.

Further, since the route selection circuit of the multiple signal transmission system according to the present invention can also select the route directly connected to the network, there is an effect that the in-band system and the out-band system can be selected by remote control.

[0023]

1 is a block diagram showing the configuration of an embodiment of a multiple signal transmission system with a remote management function of the present invention.

The first signal multiplex circuit 10A and the second signal multiplex circuit 10B also function as independent devices, respectively, and the interface on the network side is 10GE.
10G of the 1G Ether signal is demultiplexed and connected to the network. In the first signal multiplexing apparatus 10A and the second signal multiplexing apparatus 10B, the wavelengths of the optical signals to be used are arranged at a predetermined frequency interval, and the WDM multiplexer 130 transmits the optical signals in the optical wavelength region. After being demultiplexed, it is connected to a multiple signal transmission line 70 using an optical fiber.

In the configuration of the first signal multiplexer 10A,
The transmission signal of 1G Ether, which is 8B10B converted and has a transmission rate of 1.25 Gbps in consideration of the mark rate of the signal, is the first to tenth low-order signal termination circuits 60a to 6
It is terminated with 0j and is demultiplexed by the first signal demultiplexing circuit 20A. At this time, the first low-order signal termination circuit 60a
The signal passing through the first signal demultiplexing circuit 20A
To the first remote management agent 50 through the first low-order signal demultiplexing circuit 30A without directly inputting / outputting to / from the first remote management agent 50.
After being demultiplexed with the management information signal input / output to / from A, it is input / output to / from the first signal demultiplexing circuit 20A.

A configuration is also possible in which the first remote management agent 50A directly inputs to the 1 Gbps port of the first signal demultiplexing circuit 20A. However, in this case, the information amount of the management information signal of the remote management agent is extremely smaller than 1 Gbps, so that the band may be wasted.

The first low-order signal demultiplexing circuit 30A and the first
Between the remote management agents 50A, a first route selection circuit 40A controlled by the remote management agent 50A or the like is provided, and the first route selection circuit 40A is provided.
A has a function of selecting whether to connect the management information signal of the first remote management agent 50A to the first low-order signal demultiplexing circuit 30A or to the first management information signal input / output port 120A.

The first remote management agent 50A has a function of collecting management information such as contents of an alarm raised in the system in the first signal multiplexer 10A and transmitting a control signal from a remote location. Network 80
The management information is transmitted to the remote management manager 90 located at a remote place via the control signal, and the control signal from the remote management manager 90 is transmitted to each part of the first signal multiplexer 10A depending on the situation. The management information signal of the first remote management agent 50A can be sufficiently transmitted even at a low speed, and 10Base-T is used for the interface.

The second signal multiplexer 10B is also the first to the second.
0 low-order signal termination circuits 61a to 61j, a second signal demultiplexing circuit 20B, a second low-order signal demultiplexing circuit 30B,
The second remote management agent 50B, the second route selection circuit 40B, and the second management information signal input / output port 120B.
And has the same configuration and function as the above-mentioned first signal multiplexing apparatus 10A, and the first management information signal input / output port 120A and the second management information signal input / output port 120B are mutually It is connected with a 10Base-T cable.

The first signal multiplexer 10A and the second signal multiplexer 10B operate independently of each other in a normal state, but can transmit a management information signal to the first signal multiplexer 10A. In the event of a difficult obstacle, the first
The route selection circuit 40A is the first connection destination before the failure occurs.
The low-order signal demultiplexing circuit 30A is switched to the first management information signal input / output port 120A. Therefore, the first
The remote management agent 50A's management information signal is 10
The signal then enters the inside of the second signal multiplexer 10B from the second management information signal input / output port 120B through the Base-T cable, and is output to the second route selection circuit 40B.

The second route selection circuit 40B has a function of outputting a signal which is not the destination (address) of the preset second remote management agent 50B to the second second low-order signal demultiplexing circuit 30B. The management information signal from the first remote management agent 50A is remotely managed through the second path selection circuit 40B and the path used only by the second remote management agent 50B before the occurrence of the failure. It is output to the manager 90.

At this time, the first remote management agent 50A
Notifies the remote management manager 90 of the occurrence of a failure and the switched route. When the remote management manager 90 receives the notification of the occurrence of the failure, it uses the route used at this time,
After this, the route for exchanging detailed management information signals is notified again. In this embodiment, since there are only two types of routes, the route notified at this time is the same as the route notified of the failure occurrence.

When the failure is recovered, the first remote management agent 50A notifies the remote management manager 90 that the failure is recovered, and the remote management manager 90 uses the route used before the failure. Permission is given to the first remote management agent 50A.

In the present embodiment, each route selection circuit 40
A and 40B are management information signal input / output ports 120A and 12
It is also possible to connect directly to the network through OB. Therefore, the management information signal transmission by the out-band method is possible both as the multiplex signal transmission system and the signal multiplexing device.

FIG. 2 is a block diagram mainly showing a configuration example of the first path selection circuit 40A (the same applies to the second path selection circuit 40B) of the present embodiment. First path selection circuit 40A
Is composed of a transmission direction route selection block 150 and a reception direction route selection block 160.

The first path selection circuit 40A has a function of switching the signal output destination of the first remote management agent 50A to the first low-order signal demultiplexing circuit 30A or the first management information signal input / output port 120A. To have. The signal from the first remote management agent 50A is input to the transmission direction route selection block 150, and the first low-order signal demultiplexing circuit 3
0A or the first management information signal input / output port 120A. In addition, the first low-order signal demultiplexing circuit 30A
The signal input from the first management information signal input / output port 120A is input to the reception direction path selection block 160, and either one of the signals is selected and output to the first remote management agent 50A.

The first remote management agent 50A and the first
The control for switching the connection between the low-order signal demultiplexing circuit 30A or the first management information signal input / output port 120A is performed by the route selection circuit output from the first remote management agent 50A to the transmission direction route selection block 150. It is performed by the control signal 140.

In addition to this, the first route selection circuit 40A has an address addressed to the first remote management agent 50A among the signals input from the first low-order signal demultiplexing circuit 30A to the reception direction route selection block 160. A signal that does not exist is output to the transmission direction route selection block 150, output from the first management information signal input / output port 120A, and input to the reception direction route selection block 160 from the first management information signal input / output port 120A. A signal having no address addressed to the first remote management agent 50A is output to the transmission direction route selection block 150, and the first
It has a function of outputting to the low-order signal demultiplexing circuit 30A.

With this configuration, the first route selection circuit 4
Of the signals input to 0A, signals not related to the first remote management agent 50A are the first route selection circuit 40A.
Through the first management information signal input / output port 120A
Can be output to the first low-order signal demultiplexing circuit 30A, or a signal can be input / output via a path reverse to this.

Therefore, even if a failure occurs in the second signal multiplexer 10B, the second remote management agent 50 does not need to be specially set by the first route selection circuit 40A.
The B management information signal can be transmitted to the remote management manager without passing through the first path selection circuit 40A, and communication can be performed.

FIG. 3 is a block diagram mainly showing the configuration of the first low-order signal demultiplexing circuit 30A (similar to the second low-order signal demultiplexing circuit 30B) of the present invention. The first buffer 31a for the signal from the first path selection circuit 40A, the second buffer for the signal from the first low-order signal termination circuit 60a, the signals from the first buffer 31a and the second buffer 31b, Signal multiplexing block 32 for multiplexing
And a signal separation block 33 for separating the signal from the first signal demultiplexing circuit 20A.

The first low-order signal demultiplexing circuit 30A is 1G.
It is connected to the first signal demultiplexing circuit 20A at a transmission rate of bps, and is connected to the first signal demultiplexing circuit 20A through the first path selecting circuit 40A.
Is connected to the remote management agent 50A at a transmission rate of 1 Gbps and is directly connected to the first low-order signal termination circuit 60a.
It is connected at a transmission rate of Gbps. Therefore, in the signal multiplex direction, the output is 1 for 2 inputs of 1 Gbps.
Since there is only one Gbps, only 50% effective value can be obtained when the band of 1 Gbps is used for both inputs. However, the signal from the first remote management agent 50A originally has only 10 Mbps, and in practice, the sum of the bands of the input signals has an upper limit of 1010 Mbps. However, since the total sum of the bandwidth of the input signal still exceeds the output signal, the management information signal may be delayed or lost when a long packet signal is output from the first low-order signal termination circuit 60a. Signal multiplex block 32 for preventing
Has a function of preferentially multiplexing the management information signal.

In the signal multiplexing direction, the management information signal from the first remote management agent 50A is input to the first buffer 31a, and the first low-order signal termination circuit 60a.
The signal from is input to the second buffer 31b. The signal multiplexing block 32 includes the first and second buffers 31a and 31b.
The signals accumulated inside are multiplexed, but when the management information signal arrives at the first buffer 31a, the signal is immediately read from the first buffer 31a unless the signal from the second buffer 31b is being read. And outputs to the signal demultiplexing circuit 20A. When the signal from the second buffer 31b is being read, the signal is read from the first buffer 31a as soon as the packet being read is completed.

When a failure occurs in the second signal multiplexer 10B, the management information signal of the second remote management agent 50B is input to the first buffer 31a through the first route selection circuit 40A. The second remote management agent 5 only needs to be given priority control to the first buffer 31a.
The 0B management information signal is also preferentially multiplexed.

In the signal separation direction, the signal separation block 33 sends the management information signal for the first remote management agent 50A, the signal for the first low-order signal termination circuit 60a, and the second remote management agent 50B. Distribute management information signals. The signal demultiplexing block 33 reads the destination (address) of the signal input from the signal demultiplexing circuit 20A, and only the signal having the address of the first remote management agent known in advance and the address of the second remote management agent are known. It is output to the first path selection circuit 40A. Such a switching operation is usually performed by referring to the correspondence table of the destination address and the port to be output, and the processing by the CPU is required. In the present embodiment, the address of the remote management agent 50 is the same. , It is a simple signal processing to connect the remote management agent 50 to the remote management agent 50 when the mismatch is found.

The first low-order signal demultiplexing circuit 30A
Connection between the first low-order signal termination circuit 60a and the first signal demultiplexing circuit 20A without inserting the first route selection circuit 40A and the first path selection circuit 40A is directly connected to one of the ports of the signal demultiplexing circuit 20. It is also possible to have a configuration. However, in this case, the effective band of the signal multiplexer 10 is reduced to 9 Gbps of the second to tenth low-order signal termination circuits 60b to 60j.

As described above, in this embodiment, the signals of the plurality of signal multiplexers operating independently of each other are WD.
In a multiplex signal transmission system for demultiplexing M, a path selection circuit is provided to switch the transmission path of the management information signal of the remote management agent from the in-band of its own device to the in-band of another device when a failure occurs. Further, a low order signal demultiplexing circuit for demultiplexing the management information signal and other low order signals is provided.

Therefore, in the case where the signal multiplexing device collects the management information of each part of the device and also has a built-in remote management agent for managing the device according to the management information, the remote management manager remotely manages the device. Even when a failure occurs in the transmission of the management information signal transmitted in-band to one of the signal multiplexers, the transmission of the management information signal is performed using the transmission path of the management information signal of the other signal multiplexer. It is possible, and the remote management manager can identify the failure location.

That is, at the same time as the occurrence of a failure, the failure information and the like are notified to the remote management manager by using the transmission path of the management information signal of the other signal multiplexers operated independently in parallel, and After receiving the failure notification, the management manager specifies a stable transmission path and receives detailed failure information from the remote management agent.
It can be useful for identifying the location of failure.

In the above embodiment, the transmission rate of low-order signals is 1 Gbps and the transmission rate of high-order signals is 10 Gbps.
Although the description has been given by taking the example in which the transmission rate of the Gbps and the management information signal is 10 Mbps, it is obvious that the present invention can be implemented with each signal of the transmission rate other than this.

[0051]

According to the multiple signal transmission system with the remote management function of the present invention, the route selection circuit and the management for switching the transmission route of the management information signal from the in-band of the own device to the in-band of the other device in the signal multiplexer. Since the information signal input / output port is provided, even if one of the signal multiplexers operating independently of each other fails in the transmission of the management information signal, by using the management information signal input / output port, The management information signal can be transmitted by using the transmission path of the management information signal of another signal multiplexer, and the remote management manager can also identify the fault location.

Further, the signal multiplexing apparatus of the present invention can easily switch the management information signal between the in-band and the out-band, and has a configuration in which the management information signal network is independently operated as the out-band. You can smoothly switch between the two and vice versa.

In addition, since the signal multiplexer of the present invention can support in-band and out-band with one device, it is not necessary to set options during device development, and development cost can be suppressed.

Since no special remote management agent configuration is adopted, the remote management agent can be constructed at low cost simply by mounting the software for the remote management agent on a CPU board with a 10Base-T port on the market. You can

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a multiple signal transmission system with a remote management function of the present invention.

FIG. 2 is a block diagram showing a configuration example of a route selection circuit of the present invention.

FIG. 3 is a block diagram showing a configuration example of a low-order signal demultiplexing circuit of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional multiplex signal transmission system.

[Explanation of symbols]

1 Multiplex Signal Transmission Systems 2A, 20A First Signal Multiplexing / Demultiplexing Circuits 2B, 20B Second Signal Multiplexing / Demultiplexing Circuits 5, 50A, 50B Remote Management Agents 6a-6j, 60a-60j Low-Order Signal Termination Circuits for 1-10 61a to 61j 11th to 20th low-order signal terminating circuits 7, 70 Multiplex signal transmission line 8, 80 Network 9, 90 Remote management manager 10 Management information signal transmission line 10A First signal multiplexing device 10B Second signal multiplexing Demultiplexer 11 low-order signal multiplexer 12 management information signal input / output ports 13, 130 WDM multiplexer 30A first low-order signal demultiplexing circuit 30B second low-order signal demultiplexing circuit 31a first buffer 31b 2 buffer 32 signal multiplex block 33 signal separation block 40A first path selection circuit 40B second path selection circuit 120A first Management information signal input and output ports 120B second management information signal input and output ports 140 route selection circuit control signal 150 transmission direction route selection block 160 receives the direction route selection block

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Claims (6)

(57) [Claims] 1. A plurality of signal multiplexers including a signal demultiplexing circuit for demultiplexing signals between low-order transmission rate signals and high-order transmission rate optical signals, and the plurality of signal multiplexing apparatuses. And a WD for the optical signal by connecting between an optical device and a network.
In a multiplex signal transmission system with a remote management function, which comprises a WDM multiplexer that performs M demultiplexing, the plurality of signal multiplexers collect and manage management information signals and notify the remote management manager at a remote location. A remote management agent, an external management information signal input / output port for inputting / outputting a management information signal, between the remote management agent and the signal demultiplexing circuit, between the remote management agent and the management information signal input / output port, or A multiple signal transmission system with a remote management function, comprising: a route selection circuit that enables selection of any connection between the management information signal input / output port and the signal demultiplexing circuit. 2. The signal multiplexer includes a plurality of low-order signal termination circuits that terminate low-order transmission rate signals, at least one low-order signal termination circuit, the path selection circuit, and the signal demultiplexing circuit. 2. A multiplex signal transmission system with a remote management function according to claim 1, further comprising: a low-order signal multiplex / demultiplexer circuit for performing multiplex / demultiplexing of signals between the multiplex signals. 3. The route selection circuit of the remote management agent, when the interface speed on the low-order signal demultiplexing circuit side and the interface speed on the low-order signal demultiplexing circuit side of the low-order signal termination circuit are different. 3. The multiple signal transmission system with a remote management function according to claim 2, which has a function of converting an interface speed into an interface speed of the low-order signal terminating circuit. 4. A plurality of transmission paths for the management information signal are formed by connecting between the management information signal input / output ports of two signal multiplexers having a remote management agent, and the management information signal is remotely managed. A first signal multiplexer having an agent multiplexes with a signal of a lower transmission rate, or outputs from a management information signal input / output port of the first signal multiplexer and has a second remote management agent. 4. The remote management function according to claim 1, 2 or 3, wherein the management information signal input / output port of the signal multiplexing device is input and is preferentially multiplexed with the management information signal of the second signal multiplexing device. Multiple signal transmission system. 5. Between the management information signal input / output ports of two signal multiplexers having a remote management agent, or between the management information signal input / output ports of two signal multiplexers having a remote management agent and a network. By connecting the two to form a plurality of transmission paths for the management information signal, and the management information signal is multiplexed with a signal of a lower transmission rate by the first signal multiplexer having the remote management agent, Alternatively, it is output from the management information signal input / output port of the first signal multiplexer and is input to the management information signal input / output port of the second signal multiplexer having a remote management agent, and the second signal multiplexer is managed. 4. The information signal is preferentially multiplexed, or is output to the network immediately after being output from the first signal multiplexing device. Multiple signal transmission system with remote control function. 6. The route selection circuit forms a plurality of transmission routes for a management information signal of a remote management agent,
If a failure occurs in communication on the current transmission path, immediately switch to another transmission path temporarily, and the remote management agent uses the management information signal to notify the remote management manager of the failure and the transmission path used at this time. 6. The multiple signal transmission system with a remote management function according to claim 1, wherein the transmission path of the management information signal is reset according to the control of the remote management manager.