Abstract: A network relay apparatus includes: a clock generation circuit, a processing circuit, a load detector and a clock cutoff circuit. The clock generation circuit is configured to generate a clock signal having periodical clock pulses. The processing circuit is configured to operate in synchronism with the clock pulses, in order to process data that is to be relayed by the network relay apparatus. The load detector is configured to detect a load of processing by the processing circuit. The clock cutoff circuit is configured to cut off supply of the clock pulses from the clock generation circuit to the processing circuit in order to partially eliminate the clock pulses at a rate corresponding to the load detected by the load detector and to provide the clock signal having the partially eliminated clock pulses to the processing circuit.

Abstract: It is provided a communication apparatus for transferring frames, comprising: a controller for controlling operation of the communication apparatus; an interface for inputting/outputting the frames; and a plurality of frame processing parts for processing the input frames. The plurality of frame processing parts each includes: a plurality of storage areas for recording statistics of the frames to be processed; an identifier assigning part for determining, for each of the input frames, one storage area in which the statistics are to be recorded out of the plurality of storage areas, and assigning identification for identifying the determined one storage area to the each of the input frames; and a statistical processing part for updating the statistics that are recorded in the one storage area identified by the identification, by using a result of statistical processing of the frame.

Abstract: A network relay apparatus includes: a clock generation circuit, a processing circuit, a load detector and a clock cutoff circuit. The clock generation circuit is configured to generate a clock signal having periodical clock pulses. The processing circuit is configured to operate in synchronism with the clock pulses, in order to process data that is to be relayed by the network relay apparatus. The load detector is configured to detect a load of processing by the processing circuit. The clock cutoff circuit is configured to cut off supply of the clock pulses from the clock generation circuit to the processing circuit in order to partially eliminate the clock pulses at a rate corresponding to the load detected by the load detector and to provide the clock signal having the partially eliminated clock pulses to the processing circuit.

Abstract: A network relay device for relaying communication for a regular terminal via a port includes an acquiring module, a regular terminal information storing module, and a determination process module. The acquiring module acquires a regular layer 2 address, a regular layer 3 address, regular VLAN information representing a VLAN assigned to the regular terminal, and regular port information representing a port to which the regular terminal is connected. The regular terminal information storing module stores regular terminal information representing a combination of the acquired regular layer 2 address, the regular layer 3 address, the regular VLAN information, and the regular port information. The determination process module determines whether the combination of source layer 2 address, source layer 3 address, assigned VLAN, and reception port of target frame data received via the port is stored as the regular terminal information.

Abstract: A network relay device for relaying communication for a regular terminal via a port includes an acquiring module, a regular terminal information storing module, and a determination process module. The acquiring module acquires a regular layer 2 address, a regular layer 3 address, regular VLAN information representing a VLAN assigned to the regular terminal, and regular port information representing a port to which the regular terminal is connected. The regular terminal information storing module stores regular terminal information representing a combination of the acquired regular layer 2 address, the regular layer 3 address, the regular VLAN information, and the regular port information. The determination process module determines whether the combination of source layer 2 address, source layer 3 address, assigned VLAN, and reception port of target frame data received via the port is stored as the regular terminal information.

Abstract: A roll holder device is for use with a recording paper roll including a tubular spool shaft and continuous recording paper wound about the tubular spool shaft in a roll form. In the roll holder device, first and second holder cores are inserted in respectively first and second ends of the tubular spool shaft. A holder frame supports the first and second holder cores in a rotatable manner. Anti-dropping levers prevent the tubular spool shaft from dropping from the first and second holder cores by pushing a shaft inner surface of the tubular spool shaft.

Abstract: A roll holder device is for use with a recording paper roll including a tubular spool shaft and continuous recording paper wound about the tubular spool shaft in a roll form. In the roll holder device, first and second holder cores are inserted in respectively first and second ends of the tubular spool shaft. A holder frame supports the first and second holder cores in a rotatable manner. Anti-dropping levers prevent the tubular spool shaft from dropping from the first and second holder cores by pushing a shaft inner surface of the tubular spool shaft.

Abstract: A roll holder device is for use with a recording paper roll including a tubular spool shaft and continuous recording paper wound about the tubular spool shaft in a roll form. In the roll holder device, first and second holder cores are inserted in respectively first and second ends of the tubular spool shaft. A holder frame supports the first and second holder cores in a rotatable manner. Anti-dropping levers prevent the tubular spool shaft from dropping from the first and second holder cores by pushing a shaft inner surface of the tubular spool shaft.

Abstract: A roll holder device is for use with a recording paper roll including a tubular spool shaft and continuous recording paper wound about the tubular spool shaft in a roll form. In the roll holder device, first and second holder cores are inserted in respectively first and second ends of the tubular spool shaft. A holder frame supports the first and second holder cores in a rotatable manner. Anti-dropping levers prevent the tubular spool shaft from dropping from the first and second holder cores by pushing a shaft inner surface of the tubular spool shaft.

Abstract: A roll holder device is for use with a recording paper roll including a tubular spool shaft and continuous recording paper wound about the tubular spool shaft in a roll form. In the roll holder device, first and second holder cores are inserted in respectively first and second ends of the tubular spool shaft. A holder frame supports the first and second holder cores in a rotatable manner. Anti-dropping levers prevent the tubular spool shaft from dropping from the first and second holder cores by pushing a shaft inner surface of the tubular spool shaft.

Abstract: A supply magazine contains a recording paper roll constituted by continuous thermosensitive recording paper wound in a roll form. The recording paper is fed-by a supply roller. In the supply magazine, a magazine body receives the recording paper roll. A magazine lid closes the magazine body openably. Two retention levers are shiftable between retaining and releasing positions, press an outermost turn of the recording paper roll to the supply roller when in the retaining position, and release the recording paper roll from the supply roller when in the releasing position. A combination of two linking plates has first and second ends. The first end is connected with the magazine lid. The second end is connected with each of the retention levers. The linking plates shift each retention lever from the releasing position to the retaining position in response to closing of the magazine lid.

Abstract: A supply magazine contains a recording paper roll constituted by continuous thermosensitive recording paper wound in a roll form. The recording paper is fed by a supply roller. In the supply magazine, a magazine body receives the recording paper roll. A magazine lid closes the magazine body openably. Two retention levers are shiftable between retaining and releasing positions, press an outermost turn of the recording paper roll to the supply roller when in the retaining position, and release the recording paper roll from the supply roller when in the releasing position. A combination of two linking plates has first and second ends. The first end is connected with the magazine lid. The second end is connected with each of the retention levers. The linking plates shift each retention lever from the releasing position to the retaining position in response to closing of the magazine lid.

Abstract: A roll holder device is for use with a recording paper roll including a tubular spool shaft and continuous recording paper wound about the tubular spool shaft in a roll form. In the roll holder device, first and second holder cores are inserted in respectively first and second ends of the tubular spool shaft. A holder frame supports the first and second holder cores in a rotatable manner. Anti-dropping levers prevent the tubular spool shaft from dropping from the first and second holder cores by pushing a shaft inner surface of the tubular spool shaft.