サテライトマリンホン(衛生船舶電話)回線と船内電話回線を用いた統合ネットワークの構築について

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On land, the methods of exchanging information by using multimedia tools, including the Internet and the personal computer communications is spreading. The exchange of information with the people on land or among the ship is held regardless of time and place by telephone, telex and FAX via the INMARSAT communication lines. 　However, the INMARSAT communication lines were not adequate for multimedia data transmissions because of its high cost especially for comparatively long time communication. 　In March 1996, N-STAR Satellite of NTT DoKoMo was launched for providing the service of the satellite marine phone for ship mobile stations. This marine phone is in low cost for communication and enables it by means of telephone, data and FAX. The experiment to explore the possibility of exchanging information at sea in the same way that of on land was done by using this satellite marine phone. 　As a result, the effective speed of the data transfer turned out is about 1 Kb/s. However, the result of the experiment showed that we can share the data on land when we are at sea, and receive various services of the Internet or personal computer communications or construct the inboard network by using the inboard telephone lines. In addition, it had been proved that we can make an access to the UNIX system or other systems on land from Telnet (Telecommunication network). 　Meantime, we investigated the range of the service area of the satellite marine phone and then found the western edge of it. The above-mentioned various experiments were the first trials which used the said satellite lines.　If, in the future, the system is improved by remodeling the telephone lines of the inboard network to the coaxial cables or optical fibers, which construct the Internet, we will be able to obtain outboard information directly from the inboard personal computer terminals. This is considered of the great contribution to the safe navigation of the ship.
長崎大学の論文

サテライトマリンホン(衛生船舶電話)回線と船内電話回線を用いた統合ネットワークの構築について

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