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prada glasses for men, Abstract: This paper front-end cable digital TV broadcast for the safety of all aspects of detailed discussions on the security of cable digital television broadcast has some reference.

Key words: digital television, security, broadcasting, business information, time synchronization, monitoring
1. Preface With Cable Digital TV conversion steady progress overall, cable simulation program will be gradually reduced to six sets, cable TV has been broadcasting from analog, analog to digital broadcast transmission phase, the digital transmission change, to adapt the original analog front end broadcast technology system security is facing new tasks and challenges. This TV station in Guangzhou city, Guangzhou Radio and Television Network Co. , Ltd. in the construction of cable digital TV front-end experience, this preliminary study. designer sunglasses discount ,

2. prada glasses for men , Digital TV front-end and analog front-end technical features
Analog front-end is a "linear" system, as long as the wiring is correct, the normal level range, the signal can be normal transmission, the user will be able to watch normal. Digital TV front-end is different, compared to analog TV front-end, it has the following four salient features:

(1) standards for many DVB and MPEG2 published nearly 100 standards, basic and common standards are over 30.

(2) types of equipment more than the capital city of the digital TV front-end, generally close to 20 sub-systems, hundreds of different front-end equipment. prada sunglasses for women ,

(3) software support system complexity, different front-end equipment often use different software platforms and technologies, such as windows, linux operating system; SQL, Oracle, and XML Database; TCP / IP protocol, Firewall And virus protection and so on. Assume that a particular digital TV fault is caused by a computer operating system problems, even windows and database experts, to within a few minutes to restore normal operation is quite difficult.

(4) the number of mixed-mode transmission, technicians must also existing analog TV and a considerable understanding of the system. In addition, digital TV front-end systems and equipment, technical data are basically in English, reading through and correct understanding of these data takes a long time, and standards are still evolving, devices are also increasing, systems engineers need to have very solid foundation and multi-disciplinary knowledge, talents in this country the number of currently difficult to meet the needs of the rapid development of radio and television business. .