COMMUNICATION SYSTEM AND SUPERIMPOSING APPARATUS

摘要

A communication system is provided with a plurality of first terminal devices that are each connected to a transmission line and that have terminal information, a second terminal device that is connected to the transmission line and that sends to the first terminal devices an information request for requesting the terminal information, a first superimposing apparatus disposed between the first terminal devices and the transmission line, and a second superimposing apparatus that is disposed between the second terminal device and the transmission line and that receives the information request from the second terminal device. The first superimposing apparatus acquires and stores the terminal information with predetermined timing from the first terminal devices connected to the first superimposing apparatus. The second superimposing apparatus sends a transmission to the first superimposing apparatus using the superimposed signal superimposed on the transmission signal that passes through the transmission line when the information request is received. The first superimposing apparatus transmits the stored terminal information to the second superimposing apparatus using the superimposed signal when the information request is received. The second superimposing apparatus gives the terminal information thus received to the second terminal device when the terminal information is received.