Chapter 9 Communications Circuits 9.4.9 Cable TV(CATV Circuits CATV systems often have to be reengineered before they can carry signals in both directions. Using a catV circuit for data transmission requires a modem to be installed on the cable at the user's home or office 9. 4.10 Satellite circuits DSS can be used to provide high-speed access to the internet www.gxmu.edu.cn9.4.9 Cable TV (CATV) Circuits CATV systems often have to be reengineered before they can carry signals in both directions. Using a CATV circuit for data transmission requires a modem to be installed on the cable at the user’s home or office. 9.4.10 Satellite Circuits DSS can be used to provide high-speed access to the Internet. www.gxmu.edu.cn Chapter 9 Communications Circuits