| 摘要 |
PROBLEM TO BE SOLVED: To constitute a system where reliability can be improved without a stop wave owing to a fault by installing the backup function of the transmitted RF signal of CATV, which mixes the RF signals outputted from the respective output terminals of a light reception unit for indoor CATV in a mixer, and outputs it. SOLUTION: A light signal inputted to a light reception unit 14 is converted into an electric signal by a photodiode 16 and is amplified in a high frequency signal amplifier 18 through a capacitor 17. Then, it is outputted from an output terminal 20 through a relay 19 and is inputted to a mixer 34. The light signal inputted to a light reception unit 14-1 is converted into the electric signal by a photodiode 16-1 and is amplified in a high frequency signal amplifier 18-1 through a capacitor 17-1. It is outputted from an output terminal 20-1 through a relay 19-1 and is inputted to the mixer 34. Constitution for mixing the outputted electric signals and outputting it is installed and a backup function is installed. Thus, the system of high reliability can be constituted. |
