Nowadays, dial-up service is very prevalent for home users to connect to the Internet. However, it cannot satisfy people because of its low speed. Since CATV network is one of the most widely home-used broadband networks all over the world, it can be used for information service Considered the high expenditure of duplex CATV network and the asymmetry between downstream and upstream data, digital information is pushed to home users through broadband CATV channels, while the users' requests are transmitted back through PSTN. Figure. 1 shows the framework of the system.
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