The Catv Fees Control System

The CATV system,as one of the main way for information communication in our country, is developing rapidly today.It is getting more reliable in performance,more various in function, more perfect in management than before,but some problems are becoming more and more notable such as safe transmission,monitor and control of performence,charge management and so on .The CATV charge and control system meet the needs of catv systerm,it resolves these problems effectively.The CATV charge and control system is mainly composed of the management software,the header data modulator and the terminal charge and control equipment.I am responsible for design CATV charge and control equipment and test system.The header data modulator is used to encrypt the control single from computer and transmit it into the appointed frequency.the Terminal charge and control equipment demodulate out the control single from data modulator and transmit it to the addressing control part,where the demodulated FSK single is received and well-handled by the CPU unit,decode the unauthorized signals and deliver it to the shut point,shut point make use of capability of wideband anf characteristic of shut, Then the signal of illegal customer will be turn off and vice versa,the legal customer can receive the normal signal. Thus we attain the purpose of customer channel management.The distribution part deal out the output ports to the customer by any combination of the 2 ports to 16 ports according to the need of customer, a door a port, the validity control, prevent to steal to connect.The CATV charge and control system has excellent compatibility with other signals and no astriction in signal format,so you doesn`t need to worry about its future.The system involves many technical fields ,including controls of computer,communication,high frequency of electric circuits,and now it serves for more than 1,000,000 customers.