Mitsubishi Denki Kabushiki Kaisha

Yukinari Matsuda

Yoshiaki Kato

Hiroshi Honma

Susumu Oka

Masayuki Baba

Yukiyasu Kawahata

Morio Yoshimoto

First and second input data sequences are packetized to produce packets having fixed first and second lengths, respectively. A flag and headers are attached to the packets for transmission. In a demultiplexing apparatus, when the header cannot be properly identified, subsequent demultiplexing steps are performed by estimating that the subsequent data is the first input data sequence, when the first length occurs before the next flag, and estimating that the subsequent data is the second input data sequence, when the second length occurs. When the flag cannot be properly identified, the flag is expected at the first length from the previous header when the previous header indicates the first input data sequence, and the flag is expected at the second length when the previous header indicates the second input data sequence.

Multiplexing apparatus and demultiplexing apparatus

Communication is performed without paying attention to the fact that the communication is executed between multimedia terminals having communication procedures differing from each other. A terminalstarts a communication procedure that is necessary to establish a communication path to a communication service unit, in order to execute communication with a multimedia terminal; when a communication protocol conversion unitreceives communication start request from the terminal, the communication service unit executes identification process of a calling terminal based on the identification number, which exists in communication start request, for determining the multimedia terminal, and inquires a terminal information managing unitof the calling terminal. The terminal information managing unitretrieves terminal information related to the calling terminal based on a terminal information request, and informs of the retrieved terminal information to the communication protocol conversion unit. The communication protocol conversion unitinforms of the communication start request to the terminalwhen the transmitting the terminal information of the terminalis obtained, and continues a relay process in communication procedure, which is necessary for following establishment of a communication path.

Communication service unit and connection sequence operating method

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Tokyo, Japan

Yukinari Matsuda