CABLE MODEM THAT CAN PREVENT MODEM SIGNAL FROM TRANSFERRING TO THE HFC NETWORK WHEN INTERNAL CIRCUIT OF THE CABLE MODEM OPERATES ABNORMALLY

摘要

The present invention relates to a cable modem, and controls the entire system and the first reception modem signal under the control of the enable signal and the second of CPU, the first enable signal for generating an enable signal and outputting a modem signal to a data bus the low-pass filter, and the first enable signal and a second enable signal for receiving the output signal of the PGC, PGC for controlling the size and the PGC receives the output signal of the transformer, the transformer which separates the rear end, and remove a high frequency component and receiving the output signal of the low-pass filter, and is characterized in that a first enable signal and a second selection circuit that is send, or not send the output signal of the low-pass filter to the HFC network under the control of the second enable signal.; According to the cable modem in accordance with the present invention, the internal circuit is operating abnormally when the uplink signal of the incoming cable modem to the HFC network it is possible to prevent the whole network down.