Mitsubishi Denki Kabushiki Kaisha

Yoshiko Yamada

Masayuki Doi

A service method of connection management for a communication line is established to perform a desired connection of the communication line in accordance with a telephone caller's request when the caller wants to be connected to a called person by way of the communication line. The method includes the steps of: detecting whether or not the communication line is crowded; measuring a passed time of a connected state of the communication line if the communication line is crowded; determining whether or not the passed time of the connected state has reached a predetermined set-up time; and compulsorily interrupting the connected state of the communication line when the passed time of the connected state has reached the predetermined set-up time. Thus, even if a communication line is very crowded because a disaster has happened, it is sure to enable more people to make phone calls, without producing a situation in which the communication line is occupied by only few people.

Connection management servicing method for communication channel

Mobile communication terminal

A multiple communication system is comprised of a plurality of communication networks including mobile communication networks. The plurality of communication networks are connected to each other by exchanges. Terminal devices including mobile terminal devices belong to respective communication networks and can communicate with each other via the exchange in the communication network in which the terminal device is accommodated. When a call is originated, the terminal device sends a designated call incoming code for specifying a destination mobile communication network for connection. The exchange connects to the mobile communication network corresponding to the designated incoming call code received from the terminal device.

Multiple communication system, exchange, and terminal device

The invention concerns a mobile communication terminal for use in mobile communication or mobile satellite communication. In the mobile communication terminal provided with a DSP for processing a communication signal according to the mode of communication, a CPU for indicating the communication mode to the DSP, and a clock generator for supplying a clock signal to the DSP, the clock generator changes the clock signal for the DSP in response to a request for changing the frequency from the DSP based on the communication mode.

A communication circuit fault detector tests a communication circuit by using a sequence generator to generate a test signal, a memory circuit to temporarily store the test signal, and a multiplexer to multiplex the test signal and an input data signal into the communication circuit. A timing generator drives the communication circuit at a rate higher than the normal communication rate, enabling the data signal and test signal to be sent through the communication circuit simultaneously. A demultiplexer demultiplexes the output signal from the communication circuit into an output data signal and a returned test signal. A comparator compares the returned test signal with the test signal stored in the memory circuit and generates a result signal indicating whether they match.

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Tokyo, Japan

Yoshiko Yamada