Digital television broadcast and security systems to protect building - Digital TV, security broadcast - Communications Industry

Digital television broadcast and security systems to protect building - Digital TV

, security broadcast - Communications Industry

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.

2. 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.

(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.

Therefore, the protection of front-end systems require different professional and technical personnel work closely with each other to jointly complete the construction and maintenance of the system. Entire technology system has been from the traditional "power of examples is endless," into a collective effort to rely on, rely on forward-looking system construction, to ensure stability and security.

3. Broadcast digital TV front-end to protect the safety of construction

3.1 System Security broadcast an important principle

In the digital TV front-end structures, the Guangzhou cable broadcast safety point of view from the identified some important principles:

(1) System Recovery to "hardware-based backup and recovery, fault repair auxiliary equipment off" approach. Not to repair the system only at a high level technical personnel entrusted him. Given the complexity of the system, the core of the system equipment, the only equipment failure-prone equipment must be double backup. Based backup features and equipment levels were identified as system backup, the backup board, port or line backup backup.

(2) in the system design phase of systems and equipment in light of the characteristics, proceed to develop careful contingency plans. On every aspect of equipment failure caused the fault plane, fault repair time, staff skills and other factors needs to do a comprehensive and detailed analysis of the program on the system optimization and evaluation of repeated, as much as possible to reduce the system's single point of failure points, and technical risks , the failure time control in the range of permitted and controlled.

3.2 broadcast backup safety Accordance with these principles, to determine a variety of backup devices, shown in Figure 1. STB Will not normally search and watch programs broadcast equivalent of the entire network disruption incident. Therefore, the business information (SI) broadcast is a measure of stability and accuracy of the digital front-end system, one of the important indicators.

4.1 Business Information (SI) mechanism for broadcast

The current system generally, including radio and television, NVOD (Near Video-on-demand), data broadcasting these types of business, in general, radio and television programs, business information (SI) by business information (SI) generated by the server , and NVOD video and data services, the packer will also have their own radio system business information (SI). From the specification and long-term point of view, all business use of a unified business information (SI) generator system can guarantee the best business information (SI) accuracy and consistency. But in practice, the three subsystems are generally provided by different suppliers, all of the business information (SI) of understanding and configuration are not the same, and difficult to coordinate, system integration time is long. With data broadcasting, NVOD business development time is not long, uncertain business forms, business information (SI) of the adjusted and updated more frequently. Therefore, we adopted the following business information (SI) broadcast mechanism:

Compromise with the above, realized all the business information (SI) of the unified planning and guidance, in turn broadcast TV, basic services and value-added services effectively separated. When the NVOD and data broadcasting services information (SI) to update or broadcast fault occurs, will not affect radio and television service information (SI) of normal broadcast, radio and television services will not have any impact on normal operation, and vice versa, This is conducive to the stability of the operation, security, broadcasting has been effectively protected.

4.2 business information bandwidth allocation

As the digital front-end business and growing programs, business information (SI) will synchronize the demand for bandwidth increases, the bandwidth allocation, requiring a balance of programs and business information (SI), the bandwidth requirements, can not simply the pursuit of each frequency the number of program delivery, to business information for the next few years (SI) increase in reserve sufficient bandwidth.

According to DVB standards, the symbol rate 6.875Mbaud, each frequency point of maximum bandwidth = 6.875 * 6 = 41.25Mbps; remove the error correction to protect the actual bytes of effective bandwidth is about 38Mbps. Experience video program at 4.5Mbps or more, the quality of programs was more secure, according to 5Mbps plan, six sets of each frequency point pass program, requiring a total of 30Mbps. Guangzhou program planning target of 200 units a week of programs and program profile on the bandwidth of greater demand, SI distribution

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