JPS60239130A - Submarine cable communication system - Google Patents

Abstract

PURPOSE:To realize a communication system provided with both functions of relaying of a communication signal and submarine survey by providing respectively a relay means of the communication signal, a submarine survey means, a control means to control the said submarine survey means, a submarine installing equipment and a terminal equipment to at least two sections of a submarine cable connecting two landing stations to attain the communication via the cable. CONSTITUTION:In decreasing the supergroups transmitted/received between the landing stations 1, 1' into 7, i.e., 420 telephone lines, an idle transmission band of 420kHz, for one supergroup's share is transmitted through the submarine transmission line. Triangles (312-512kHz, 4,808-5,048kHz) shown in broken lines depict the idle band. It is possible for the landing station to receive a survey data signal from each submarine installing equipment by allowing the submarine installing equipments 21-2n to convert and insert the submarine survey data signal from a sensor detected in this way to the said band. For example, not only the communication signal is relayed by a repeater 201 but also the signal from the sensor is inserted to the submarine cable by controlling the sensor 204 with the control signal extracted from a signal converter 202.

Description

[Detailed description of the invention] [Technical field of invention] The present invention enables □ Concerning submarine cable communication methods for communication.

[Prior art]

Conventionally, methods for relaying communication information using submarine cables, or methods for detecting and transmitting earthquake occurrences, submarine sounds, etc., have been carried out using different methods. Therefore, the reality is that two communication systems and submarine observation systems are constructed on the ocean floor as separate systems, and double investment is required for similar systems, especially those involving expensive cables. Not only is this uneconomical, but it also causes a lot of trouble and inconvenience in terms of installation and maintenance due to cable crossings.

there were.

[Purpose of sale]

An object of the present invention is to eliminate the above-mentioned disadvantages.

The object of the present invention is to provide a submarine cable communication system that can be used for both relay transmission of two communications and data collection for ocean floor observation by making use of the submarine cable economically and logically.

[Structure of the invention]

The submarine cable communication system according to the present invention includes, in at least two sections of a submarine cable connecting two landing stations, a communication signal relay means, a seabed observation means, and a control means for controlling the seafloor observation means. , a signal conversion means for extracting a control signal on the submarine cable to send a control signal to the control means, and for transmitting an observation signal obtained by the submarine observation means onto the submarine cable. means for providing an installation device and transmitting and receiving communication signals to and from the opposing station at the landing station via a relay means of the submarine installation device;
The present invention is characterized by providing a terminal device including means for sending the control signal to the seabed installation device and means for receiving observation signals sent from the seabed installation device.

[Basis of the invention]

Conventional submarine cable communication methods include various transmission methods using submarine coaxial cables, and submarine observation methods include:
The methods used include submarine seismic observation methods using submarine coaxial cables or paired cables, submarine sound detection methods, and submarine slope observation methods. Furthermore, the practical application of submarine cable transmission systems using optical fibers and various submarine observation systems is fast approaching. When considering various seabed observation methods, the amount of information sent out from each individual seafloor observation sensor is at most a few kilobits (seafloor sound observation), and the number of sensors themselves may vary. There aren't that many.

Also, earthquakes, temperature, water pressure, etc. are less than a few tens of bits. Therefore, the amount of information from the entire ocean floor observation system is not very large. And the cables that transmit this information.

Even if it is a pair of cables, it has a large transmission capacity, but if we look at observation systems using coaxial cables, only a small portion of that capacity is utilized. Therefore, a relay transmission line can be constructed using the remaining capacity. On the other hand, various submarine cable transmission systems transmit a large amount of information, but only at the upper end of the transmission band.

Alternatively, there is some room at the bottom, making it possible to superimpose seafloor observation information. Furthermore, if this margin is small, the input signal for relay transmission can be reduced until the required margin is generated and the submarine observation signal can be carried. Thus 2
It becomes possible to realize an undersea table communication system that has both the functions of relaying communication signals and observing the seafloor.

[Embodiments of the invention]

Next, two embodiments of a submarine cable communication system according to the present invention will be described with reference to one drawing.

FIG. 1 is a system diagram showing the system configuration of an embodiment according to the present invention. In this figure, 1.1' is a landing station, A and A' are input/output terminals for communication signals at landing stations 1 and 1', respectively, and B and B' are terminals for outputting seabed observation data signals and inside the seabed installation equipment, respectively. It is also the input terminal for the sensor control signal. 21. ..., 2,...
・2n is a submarine installation device. These submarine installation devices are explained in detail in the block diagram in Figure 3.
A communication signal repeater, a signal converter for receiving control signals from land, and a signal converter for receiving control signals from land.

It is equipped with a controller that performs necessary control based on control signals received via a signal converter, as well as necessary sensors.

In addition, 31, 3i, 3j, 3m indicate submarine cables,
Twin cable, coaxial cable.

Optical fiber cables are used.

FIG. 2 shows an example of a transmission frequency band by the frequency division multiplexing transmission system applied to the embodiment of FIG. 1. There are various submarine coaxial transmission systems using frequency division multiplexing, but in this example, the bandwidth is approximately 5 MH2.
Show things. In Figure 2, the low group (312
~2292k)T,,).

For example, it is used for transmission in the direction from landing station 1 to landing station 1', and the high group (3068 to 5048 kHz) is used for transmission in the opposite direction, and the - core coaxial cable is used as a transmission path to separate both the sending and receiving signals. A system (called a two-wire system by group) is adopted. In this example, there are eight 240kHz L bands (one triangle mark in the figure) called a supergroup consisting of 4kHz7, band telephone lines 60, that is, 480 telephone lines and landing stations 1, 1.
This shows the method that can be sent and received between .

In this example, if the number of supergroups transmitted and received between landing stations is reduced to seven, that is, 420 telephone lines, one supergroup will be connected to the submarine transmission line.
(420kHz band). Second
The triangular part indicated by the broken line in the figure (312 to 512 kH2
, 4808 to 5048kHz7) is an empty band. By converting and inserting the seabed observation data signals from the sensors detected by each seabed installation device into this part, the landing station will be able to receive observation data signals from each seabed installation device. . Furthermore, when the amount of information from the submarine installed equipment is large, the transmission capacity between the landing stations may be limited as appropriate. Note that no signal is inserted into the input terminal of the landing station in the part marked with a broken triangle in FIG. Therefore,
For control within submarine installed equipment.

A control signal may be inserted into a suitable band within this vacant transmission band so that each submarine installation device can identify and extract the control signal. The above method is the same in the digital multiplex transmission system, and only empty time slots are used instead of the entire transmission band in the two-frequency division system.

FIG. 3 is a block diagram showing a specific example of the configuration of the submarine installation device shown in FIG. 1.

In this figure, 200 is a pressure-resistant casing of the device, 201 is a repeater for relaying communication signals between landing stations, and 202
203 is a signal converter for inserting a signal from a sensor into the All-France transmission line or extracting a control signal, and 203 is a signal converter for performing necessary control after receiving a control signal from land via the signal converter 202. The controller 204 is a sensor, 2
There may be more than one. 205, 205' are connection points with submarine cables. Note that a power source is required to operate each of these devices, and in the submarine cable system, power is generally transmitted from a landing station, but the power supply circuit is omitted here. By using the submarine installation device configured in this way, communication signals can of course be relayed by the repeater 201.

Control signals extracted from signal converter 202 can control sensor 204 to insert signals from the sensor onto the submarine cable.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in addition to the conventional submarine cable transmission method for communication between land-based systems, it is possible to collect seafloor observation information. A telecommunications company suffered an undersea earthquake.

Provided observation information such as information on submarine volcanoes to the Japan Meteorological Agency.

A government agency or other department that primarily conducts seafloor observation secures its own communication line and provides the line to a telecommunications carrier, or obtains seafloor observation data for defense purposes.

It is also useful for securing defense communication lines, etc., and contributes to efficient use of equipment costs and maintenance of secrecy.

The benefits are significant.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the system configuration of an embodiment according to the present invention, Fig. 2 is a diagram showing an example of a transmission frequency band by the frequency division multiplexing transmission method applied to the embodiment of Fig. 1, and Fig. 3 2 is a block diagram showing a specific example of the configuration of the submarine installation device in FIG. 1. FIG. In the figure, 1 and 1' are landing stations, 21.2k. 2n is a submarine installation device; 31, 3i, 3j, and 3m are submarine cables; 200 is a pressure-resistant case; 201 is a repeater; 202 is a signal converter; 203 is a controller; and 204 is a sensor. Nuro＼(Rono200 Figure 3)

Claims (1)

[Claims] Communication signal relay means are provided in at least two sections of a submarine cable connecting twelve landing stations. A seabed observation means, a control means for controlling the seabed observation means, a control signal on the submarine cable for extracting a control signal on the submarine cable for sending a control signal to the control means, and an observation signal obtained by the seafloor observation means. means for transmitting and receiving communication signals between the landing station and an opposing station via the relay means of the submarine installation device; A submarine cable communication system comprising: a terminal device including means for transmitting the control signal to the submarine installed device and means for receiving an observation signal sent from the submarine installed device.