JPS6367847A - On-ship local area network system - Google Patents

Abstract

PURPOSE:To improve the reliability of a system by connecting all stations in a loop by optical fiber cables, and connecting every two stations directly by optical fiber cables and forming by-pass loops. CONSTITUTION:Systems and equipments on a ship are divided into four blocks, and stations 10-13 which handle all pieces of information of the respective blocks are provided, block by block, and connected in a loop by the optical fiber cables CA1 to form an in-use loop. Further, the stations 11 and 13 are connected directly by a 1st optical fiber cables CA2 to form the 1st by-pass loop and the stations 10 and 12 are connected directly by the 2nd optical fiber cables CA3 to form a 2nd by-pass loop. Consequently, even if a loop system becomes faulty owing to an accident, that is coped with extremely flexibly by using the by-pass loop and a loop-back function together.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to a local area network system (hereinafter abbreviated as LAN) installed throughout a ship for collecting and transmitting a large amount of information from each system and device. ) regarding.

[Prior Art] In general, in super-automated ships or ships with reduced size, various information obtained from all systems and devices on board the ship is automatically collected to perform integrated monitoring on board the ship, as well as on land. This information is transmitted to shipping companies, etc. using wireless means to improve the safety of navigation. In particular, information regarding the safety of the ship's hull, cargo, and the lives of the crew members must be kept at all times. For this reason, a so-called LAN system is formed in a ship, in which various systems and devices are connected and transmission lines are laid out.

In conventional AN systems, multi-core stranded cables or coaxial cables were used as transmission lines, but since there are noise sources such as generators inside ships, these cables are difficult to immunize against the effects of noise. It was easy to accept. In addition, these cables were difficult to transmit multiple areas of information at high speed, and were therefore unsuitable for speeding up information processing.

Therefore, as a transmission path for a LAN system, it is highly resistant to noise.
Optical fiber cables, which can process large amounts of information at high speed, are being introduced. In this case, for example, as shown in FIG. 7, a two-core optical fiber cable CA is used, and the mask station MS and a plurality of local stations LS are connected in a loop through this cable CA.

[Problems to be solved by the invention] However, a ship L using the above-mentioned optical fiber cable
The AN system had the following dramatic points. In other words, although optical fiber cables are physically weak due to their inflexibility, physical external forces from loading and unloading cargo are easily applied to the cables inside a ship, and the cables are susceptible to shaking and shaking of the ship.
Perturbations, shocks, etc. are commonplace. As a result, there was a high risk that the optical fiber cable would be damaged and the system would go down. For example, as shown in Fig. 8, a two-core optical fiber cable CA is installed near the mask station N1S.
If one different core fails at two locations Pi and P2,
The loop will not work at all.

On the other hand, as shown in Fig. 9, local station L
Two points P1. of the two-core optical fiber cable CA near S.
If one different core fails in P2, it is possible to partially maintain the function by loopback, but the local station LS' immediately becomes unable to collect data.

Further, as mentioned above, if a LAN system malfunctions due to damage to an optical fiber cable, etc., since it is often located at sea, service cannot be promptly provided, and there is a risk that the malfunction will be prolonged. Therefore, as a backup method, it is conceivable to configure the LAN system with an independent multiple loop configuration, but it has been difficult to use a multiple loop configuration because the installation of optical fiber cables is extremely expensive.

The present invention was made based on these circumstances,
The objective is to create a local ship for ships that is resistant to noise (can process a large amount of information at high speed, has excellent accident resistance, can improve reliability, is easy to configure, and can be realized at low cost). Its purpose is to provide area network systems.

[Means for solving the problems] In order to solve the above problems and achieve the purpose, the present invention has the following features:
By dividing the systems and equipment in the ship into at least four blocks, equipping each block with a station that handles all the information in each block, and connecting all these stations in a loop with optical fiber cables, a regular loop can be created. and any two of the stations are directly connected by a first optical fiber cable to form a first bypass loop, and any two of the stations other than the stations directly connected by the first optical fiber cable are A second bypass loop is formed by directly connecting the two stations with a second optical fiber cable.

[Function] By taking such measures, the system has extremely high accident resistance, and can also be used in conjunction with the bypass loop and loopback functions to respond very flexibly to failures in the loop system due to accidents. be.

[Example] Hereinafter, a practical example of the present invention will be described with reference to the drawings.

FIG. 1 is a system diagram conceptually showing the configuration of a ship LAN system according to the same embodiment, and FIG. 2 is a schematic diagram conceptually showing the state in which this system is installed inside a ship. In FIGS. 1 and 2, a master station (MS) 10 is installed on the bridge of the ship, and mainly handles all ship handling systems, navigation systems, and radio systems.

It handles information from marine and meteorological sensors.

The 10th car station (LSI) 11 is equipped under cargo handling control and mainly handles information such as monitoring the status of the cargo in the 3 cargo warehouses, the cargo maintenance device, and the deck V1 machine. The 20th cal station (LS2) 12 is installed in the control seedling, and mainly handles information on the propulsion engine 2 generator, various catching systems, etc. 30th - Cal Station (LS3-13 is equipped in the office, personnel 1 as soil)
It contains information on food, insurance, various administrative procedures, etc.

The master station 10 and all other local stations 11 to 13 are sequentially connected in a loop through two-core optical fiber cables CAI.
This forms a common use loop 20. Note that one of the common loops 20 is an information loop, and the other one is an information loop.
The core is a monitoring loop. In addition, the 10th Department of Cargo Handling Control Science
- Cal Station 11 and the 30th Cal Station 13 in the office are directly connected by a two-core optical fiber cable CA2, which allows the first bypass loop 30
is formed. Furthermore, the mask station 10 and the 20th cal station 12 in the mechanical system tIli are directly connected by a two-core optical fiber cable CA3.
This forms a second bypass loop 40. Here, the first. The second bypass loop 30.40 is different from the common loop 20 of the optical fiber cable! ! The crotch area is completely independent. Therefore, the common loop 20 and the first . It is highly unlikely that the second bypass loop 30.40 will fail at the same time.

In this example configured in this way, the common loop 20 is normally used to collect and transmit information between the stations 10-13.

In this state, if the optical fiber loop CA1 is completely cut off at one point P1 of the common loop 20 as shown in FIG. 11)
The function is maintained by looping back at and making the broken line portion Q1 unusable.

Further, as shown in FIG. 4, for example, there are two locations P1 on both sides of the common loop with the 10th cal station 11 in between. If the optical fiber cable CA1 is cut at P2, loopback is performed at the tenth cal station 11 using the first bypass loop 30, and the stations at both ends of this station 11 (in this case, the mask station 10 and the 20th Cal Station 12), the broken line portion Q1. By disabling Q2, its functionality is maintained.

Furthermore, as shown in FIG. 5, three different locations P1. P2. If the optical fiber cable CA1 is cut at P3, the first. Second bypass loop 30,4
0 is used to perform a loopback at the local station (in this case, the 1st, 20th, and 11th stations) using Q1. Q2. By disabling Q3, its functionality is maintained.

Furthermore, if the optical fiber cable CA1 is cut at two points P1 and P2 on both sides of the mask station 10 in the regular loop 20 as shown in FIG. At the same time, loopback is performed at the local stations on both sides (in this case, 1st, 30th, and 11th and 13th stations), and the dashed line portion Ql is performed.
.

By disabling Q2, its functionality is maintained.

In this way, according to the LAN system of this example, the third
As shown in Figures 6 to 6, failures in the service loop 20 in all cases can be dealt with extremely flexibly by the combination of the bypass loop 30, 40 and the loopback, and its functionality can be reliably maintained. Ru. Furthermore, since the regular loop 20 and the first and second bypass loops 30.40 are connected by independent dual transmission paths, and these loops 20.30.40 are connected to different stations, Optical fiber cable CAI.

CA2. The location where CA3 will be installed is completely determined. For this reason,
It is very unlikely that the service loop 20 and the bypass loop 30, 40 will fail at the same time. Therefore, there is a very low possibility that the function of the LAN system will go down, and information on each system and device can be reliably collected and transmitted, thereby further increasing the safety of navigation. Furthermore, the bypass loop 30
40 can be realized with a shorter cable than in the case where the common loops 20 are overlapped, so the installation is easy and there is no risk of high cost.

[Effects of the Invention] As detailed above, according to the present invention, the systems and equipment in the ship are divided into at least four blocks, and each block is equipped with a station that receives all the information of each block. All of these stations are connected in a loop by optical fiber cables to form a regular loop, and any two of the stations are directly connected by a first optical fiber cable to form a first bypass loop. At the same time, two stations other than the station directly connected by the first optical fiber cable are directly connected by the second optical fiber cable to form a second bypass loop, thereby reducing noise. It is possible to provide a local area network system for ships that is resistant to damage, can process a large amount of information at high speed, has excellent accident resistance, can improve reliability, and can be easily configured and realized at low cost.

[Brief explanation of the drawing]

1 to 6 are diagrams showing an example of the present invention, in which FIG. 1 is a system diagram conceptually showing the configuration of a LAN system in the embodiment, and FIG. 2 is a system diagram showing the configuration of a LAN system in the embodiment. LAN
A schematic diagram conceptually showing the state in which the system is installed on a ship,
Figures 3 to 6 are schematic diagrams for explaining countermeasures against any failures in the common loop, and Figures 7 to 9 are
The drawings are diagrams showing a conventional example, and FIG. 7 is a system diagram showing an example of a conventional LAN system, and FIGS. 8 and 9 are schematic diagrams for explaining the problems of the conventional system. 10...Master station, 11-13...Local station, 20...Common loop 30.40.
...First. Second bypass loop, CA1-CA3...
・Optical fiber cable. Applicant's agent Patent attorney Takehiko Suzue No. 4 (j2 Figure 7 Figure N8 Figure 9

Claims (1)

[Claims] The systems and equipment onboard the ship are divided into at least four blocks, each of which is equipped with at least four stations that handle all the information in each block, and all these stations are connected by fiber optic cables. a first bypass loop formed by directly connecting any two of the stations with a first optical fiber cable; and a second bypass loop formed by directly connecting two stations other than the station directly connected by an optical fiber cable with a second optical fiber cable. system.