JPS62165446A - Hybrid transmission system - Google Patents

Abstract

PURPOSE:To attain hybrid transmission by selecting a metallic transmission system in a short distance transmission section and an optical fiber transmission system in a long distance transmission section in accordance with the length of transmission sections, and connecting respective transmission systems as one transmission system. CONSTITUTION:In case of remote monitoring of earthquake or the like, short distance transmission is used for the collection of many seismo-meter information in an island and long distance transmission is used for the transmission of the collected information to the main land. An optical fiber transmission system(FOTS) terminal station 3, an optical fiber cable 1, an optical repeater 4, an FOTS terminal station, a metallic transmission system (MTS) terminal station, and a repeater function station 5 constitute FOTS and the station 5, a metallic cable 2, an MTS terminal station, a repeater function station 6 form MTS. A signal obtained by the analog or digital multiplex of information outputted from an information source 7 is sent to the terminal station 5 and electro-optically converted, the optical information is sent to the main land, the sent information is photoelectrically converted so as to be returned to a multiplexed electric signal to process the electric signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wired transmission system, and particularly to a hybrid transmission system that mixes optical and electrical image transmission systems.

[Conventional technology]

For the past few decades, wired telecommunications have used a transmission system that uses so-called metallic conductors to transmit electrical signals. In recent years, with the development of optical fibers, optical transmission systems have come into practical use for long-distance, large-capacity transmission. However, optical transmission method (Fiber 0pti)
c Trans-mission System,
Hereinafter abbreviated as FOTS) is a metallic transmission method (Meta
lic Transmission System,
(hereinafter abbreviated as MTS), but a mixed transmission system that takes advantage of the strengths of each has not been put into practical use.

[Problem that the invention seeks to solve]

Now, the main advantages and disadvantages of FOTS over MTS are listed below.

Advantages ■ Large capacity can be transmitted over long distances without repeating.

■The cable can be thin.

■Strong for induction.

Disadvantages ■Electric-optical converter (E/○) in relay device.

Requires an optical-to-electrical converter (0/E).

This is expensive and has reliability issues. Ru.

■Connecting fiber is not easy.

■Power cannot be sent.

etc. Conversely, if we turn these advantages and disadvantages over, we get the advantages and disadvantages of MTS. Therefore, considering the above advantages and disadvantages.

If the distance is short, the capacity is small, and there are many cable failures,
MTS is more economical than FOTS.

Therefore, for example, in remote monitoring of seismometer information at earthquake-prone locations, communication records with oil rigs scattered far off the coast, and transmission methods that collect a large amount of information over a relatively short distance and transmit it over long distances, It is economical to use a hybrid transmission system that uses MTS for the short section and FOTS for the long distance transmission section.

[Means for solving problems]

The hybrid transmission method of the present invention uses a metallic transmission method in a short distance transmission section.

An optical fiber transmission method is used in the long-distance transmission section, and both of these methods are selected depending on the length of the relay section, and each transmission method is connected in a dependent manner to form a single transmission method.

〔Example〕

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is an optical fiber hoople, 2 is a metallic cable, and 6 is an FO
TS terminal station, 4 is an optical repeater, 5 is a combination of FOTS terminal station, MTS terminal station, and MTS repeater functions, 6 is MT
7 is an information source that combines the functions of an S terminal station and a repeater. An example of this is the case of distant monitoring of earthquakes; for example, it can be assumed that a large number of seismometers are installed on the island of Miyakejima and transmitted via submarine optical cables to an observation station on the island of Honshu. Collecting information from a large number of seismometers on the island is a short-distance transmission, and transmitting all of this information to Honshu is a long-distance transmission. Therefore, in the figure, 5, 1, 4.5 are FOT
5 and 2.6 constitute the MTS. In the example shown in the figure, 5 and 6 are so-called drop-insert communication systems, in which information from the information source 7 (seismometer in this case) is sequentially analog or digitally multiplexed at spatially distributed terminal stations and sent to the MTS terminal station 5. Here, the signal is converted into optical signal by Elo and transmitted to Honshu, where it is converted back to an electrical signal multiplexed by ○/E at FOTS terminal station 3 and processed. Also, seismograph control signals are transmitted from the FOTS3 terminal station,
It is converted back into an electrical signal by the other F'OTS terminal station 5, depending on the information of the control signal.

One of the specific MTS terminal stations 6 will operate and perform predetermined control.

It is also possible to consider Figure 1 as an oil rig communication system. In that case, 6 is an MTS relay/terminal station on oil rigs scattered offshore, 5 is a special KMTS and FOTS relay/terminal function, 2 is a metallic cable, and 7 is a telephone on each rig. be. Furthermore, the system Ro-1-4-5 can be considered in the same way as the earthquake observation system described above. In this case as well, the MTS part is a drop-insert method, and is a method in which signals are sequentially multiplexed over a metallic transmission path from a distant rig when viewed from the FOTS-MTS relay/terminal station 5. In particular, the submarine cables surrounding the 9 oil rigs are subject to repeated anchoring and unloading by ships, so there is a high possibility of cable failure.

In this case, metallic cables also have the long-term advantage of being easier to locate and repair faults than fiber cables. Regarding the FOTS part, offshore rigs are often located at most 200km from the coast, and oil rig communication has a smaller capacity than onshore communication, so if the system is selected well, non-relay transmission is possible.

It is a coincidence that both of the above two examples use submarine transmission methods, and it goes without saying that this method can also be applied to land-based communications.

〔Effect of the invention〕

As explained above, the present invention is a relatively small-capacity communication, which requires relaying over a short distance, and which requires long-distance transmission at one end. MTS for long distance transmission, FOT for long distance transmission section.
By using S, it is possible to make repeaters more economical and highly reliable in short-distance transmission sections, and to make the entire transmission system more economical by making it more economical by using long relay spans using FOTS in long-distance transmission sections. Dogs can be applied to observation systems, public telephone transmission systems for special purposes, communication systems between head offices and factories via leased lines, etc., resulting in economical quality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 1... optical fiber cable, 2... metallic cable, 6... FOTS terminal station, 4... optical repeater, 5...
...combining the functions of a FOTS terminal station and an MTS terminal station and a repeater, 6...combining the functions of an MTS terminal station and a repeater, 7...information source.

Claims (1)

[Claims] 1. Use the metallic transmission method in short-distance transmission sections, and use the optical fiber transmission method in long-distance transmission sections, select both methods according to the length of the transmission section, and connect each transmission method in a subordinate manner. A hybrid transmission method characterized by combining the two into a single transmission method.