Abstract: In order to improve degradation of receiving sensitivity caused by analog characteristics degradation in an optical receiver, the optical receiver includes: the first coefficient computing unit for computing the first equalization filter coefficient for compensating the first waveform distortion caused and formed by an optical transmission path; the second coefficient calculating unit for predetermining the second equalization filter coefficient for compensating the second waveform distortion caused and formed by an analog characteristics degradation of components; a coefficient operating unit for performing operation to the first equalization filter coefficient and the second equalization filter coefficient and outputting the third equalization filter coefficient; and a waveform equalization processing unit including a waveform equalization filter for performing an equalization process to an input signal including the first waveform distortion and the second waveform distortion based on the third equalizatio

Abstract: A mobile terminal includes a mobile phone function unit, a storing unit, a communication control unit, and a store-and-forward multihop communication function unit. The mobile phone function unit confirms status of connection with a mobile base station and exchanges information with the mobile base station when the status of connection is a connection state. The storing unit stores information received and generated by the mobile phone function unit. The communication control unit receives connection information including the status of connection from the mobile phone function unit and generates a control signal when the connection information indicates a disconnection state.

Abstract: A system includes a storage for storing positional information of telephone terminals, a determiner for being notified of a called telephone terminal by an exchange which received a call from a calling telephone terminal, and determining whether the called telephone terminal is in a particular area, and an indicator for, if the called telephone terminal is in the area, retrieving a telephone terminal in a range based on the called telephone terminal, as a neighboring terminal, and indicating the neighboring terminal to the exchange. The exchange includes a requester for sending a connection request to another exchange, to request that a connection be made between the called telephone terminal and the neighboring terminal, and a caller for receiving a connection request from another exchange and sending a call to a telephone terminal which is assigned by the connection request.

Abstract: A communication device includes a reception unit that receives an emergency alarm signal transmitted from a broadcasting station in an emergency, a conversion unit that executes first conversion processing for converting an analog transmission signal to a digital transmission signal at a first bit rate when the emergency alarm signal is not being received, and executes second conversion processing for converting the analog transmission signal to a digital transmission signal at a second bit rate that is lower than the first bit rate when the emergency alarm signal has been received; and a transmission unit that transmits the digital transmission signal.

Abstract: A first transmitter transmits input data through a plurality of paths belonging to a path group. A second transmitter receives the data transmitted from the first transmitter through the plurality of paths, temporarily stores an amount of the data corresponding to a phase difference between the plurality of paths in a first buffer to absorb the phase difference, and outputs the data, whose phase difference has been absorbed, through a second buffer. When a path is deleted from the path group, the first transmitter reduces a data rate for data transmitted from the first transmitter to the second transmitter, and then deletes the path from the path group.

Abstract: A source node or a sink node retains path information of a VC path and actualizes an efficient process in an LCAS process on the basis of the path information. This can actualize an efficient process procedure in the LCAS and reduce an amount of loss data.

Abstract: The present invention provides a bandwidth control system capable of controlling the transmission of data frames using a control frame including bandwidth information. A reception-side communication apparatus 21 transmits, to a transmission-side communication apparatus 20, a control frame including bandwidth information S213 for controlling the bandwidth of data frames transmitted from the transmission-side communication apparatus 20. When receiving the control frame including the bandwidth information S213, the transmission-side communication apparatus 20 controls the transmission of the data frames on the basis of the bandwidth information S213 included in the control frame.