| 摘要 |
A distribution system including a fibre optic cable network allows the distribution of broadcast video and/or audio data received by apparatus 2, 12 at a receiving location to apparatus at one or more user (e.g. set-top box, STB) locations 4. Transmission of command (control) data signals 24 through the distribution system (e.g. two-way, opposite direction, return path) in an optical format to apparatus at the user and receiving locations allows the control and change of operation of selected apparatus connected to the distribution system. Typically the command signal data is transmitted at a different, e.g. lower, frequency (e.g. 20-25 KHz) than video and/or audio data. Relevance of the command signal to a particular apparatus may be based on identification (ID) code, e.g. a serial number. The system may apply command signals in Digital Satellite Equipment Control (DiSEqC) format to an optical fibre network. |
