| 摘要 |
PURPOSE:To realize communication among the equipments set on different hierarchies by supplying signals received from the equipment groups to a cable network after modulation and then demodulating the necessary ones out of signals received from the cable network to supply them to the equipment groups. CONSTITUTION:The output signals received from each equipment set in a store are all modulated into the frequencies of an ascending channel and sent to a coaxial cable network 4. Then these modulated signals are modulated again to the signals of a descending channel by a translator 6. These modulated signals are sent to the network 4 via a head end 3 and inputted to the necessary equipments. Thus it is possible to transfer data among the equipments within a store via the cable network set in an ordinary building. Then data can be grasped en bloc in the store. |
