| 摘要 |
Firmware is installed in a cable modem, enabling detection of the presence or absence of a cable trap in the feed of a customer location. Such a cable modem includes a trap-detection module and a trap-detection object. The trap-detection module is configured to determine whether a video signal is present at a cable-television frequency. The trap-detection object is configured to store data as to whether the video signal is present. For example, a first piece of data is stored if the video signal is present, indicating absence of a properly functioning cable trap between a cable head-end and the cable modem. A second piece of data is stored if the video signal is absent, indicating presence of a properly functioning cable trap between the cable head-end and the cable modem. |
