Abstract: A communication apparatus and an air-cooling method for the same utilizes an air-cooling mode that can be easily changed to reduce the cost to increase the number of transceiver units and space for the housing. The communication apparatus includes transceiver units installed in a housing and attachable onto and detachable from the communication apparatus and fan units for forcibly air-cooling heat generated from the transceiver units. The fan units are installed in the housing and are attachable onto and detachable from the communication apparatus. Each transceiver unit includes a transceiver function section; a forced air-cooling radiator fixedly mounted in the transceiver function section for forcibly air-cooling heat generated from the transceiver function section; and a natural air-cooling radiator mounted in the transceiver function section for naturally air-cooling heat generated from the transceiver function section.

Abstract: A communication apparatus and an air-cooling method for the same utilizes an air-cooling mode that can be easily changed to reduce the cost to increase the number of transceiver units and space for the housing. The communication apparatus includes transceiver units installed in a housing and attachable onto and detachable from the communication apparatus and fan units for forcibly air-cooling heat generated from the transceiver units. The fan units are installed in the housing and are attachable onto and detachable from the communication apparatus. Each transceiver unit includes a transceiver function section; a forced air-cooling radiator fixedly mounted in the transceiver function section for forcibly air-cooling heat generated from the transceiver function section; and a natural air-cooling radiator mounted in the transceiver function section for naturally air-cooling heat generated from the transceiver function section.

Abstract: There is provided a communication apparatus and an air-cooling method for the same, in which the air-cooling mode can be easily changed to reduce the cost to increase the number of transceiver units and the space for the housing. The communication apparatus includes transceiver units of a transmission system for communication, the units being installed in a housing and being attachable onto and detachable from the communication apparatus; fan units for forcibly air-cooling heat generated from the transceiver units, the fan units being installed in the housing and being attachable onto and detachable from the communication apparatus.

Abstract: To eliminate the necessity of providing a special heat insulating structure or heat resisting properties and to simplify wiring. A modulation/demodulation unit, transmission/reception units of active and standby transmission systems, branching units of active and standby transmission systems, and a line switching and monitor control unit are accommodated in one casing. The modulation/demodulation unit and the line switching and monitor control unit, commonly used in the active and standby transmission systems, are incorporated in the lower part of the casing, and the transmission/reception units and the branching units of the active and standby transmission systems are incorporated in the upper part of the casing. The transmission/reception units and the branching units of the active and standby transmission systems are arranged in parallel such that the branching units are positioned at the center thereof.

Abstract: There is provided a communication apparatus and an air-cooling method for the same, in which the air-cooling mode can be easily changed to reduce the cost to increase the number of transceiver units and the space for the housing. The communication apparatus includes transceiver units of a transmission system for communication, the units being installed in a housing and being attachable onto and detachable from the communication apparatus; fan units for forcibly air-cooling heat generated from the transceiver units, the fan units being installed in the housing and being attachable onto and detachable from the communication apparatus.

Abstract: To eliminate the necessity of providing a special heat insulating structure or heat resisting properties and to simplify wiring. A modulation/demodulation unit, transmission/reception units of active and standby transmission systems, branching units of active and standby transmission systems, and a line switching and monitor control unit are accommodated in one casing. The modulation/demodulation unit and the line switching and monitor control unit, commonly used in the active and standby transmission systems, are incorporated in the lower part of the casing, and the transmission/reception units and the branching units of the active and standby transmission systems are incorporated in the upper part of the casing. The transmission/reception units and the branching units of the active and standby transmission systems are arranged in parallel such that the branching units are positioned at the center thereof.

Abstract: Input image data inputted in an image block of m pixels×n pixels is changed in the size of the image block; image data of the image block changed in size is subjected to compression processing; compressed image data obtained by the compression processing is subjected to expansion processing to generate restored image data in the m-pixel×n-pixel image block; and whether or not the size of the image block is further changed is judged based on the strength of the correlation between the restored image data and the input image data. The compression processing is performed on the image data while change in size of the image block is repeated until the correlation between the restored image data and the input image data is strong, thereby making it possible to perform compression processing on the image data of the input image at a high compression ratio while maintaining the image quality of the restored image.