Application diagram

System Composition

DVB-C of CATV system consists of several parts signal source receiving, multiplexing system, conditional access, user management system (including the scrambler, CA system); signal modulation, (QAMmodulator) and the receiving system of the users ( set-top box).

Signal Source Receiving 

Equipments receive digital satellite signal source, local studio programs and A/V signal source. In this process, TS stream, A/V or HDMI audio video signal covert to IP stream out. We would like to recommend our high quality headend eqiupments suitble for the system. They are typical product of satellite receiver, mpeg-2 encoder and MPEG-4 encoder.

Multiplexing and Scrambling

The main function of multiplexing technology can multiplex TS streams of different programs to one TS stream out with multiple programs. Both multiplexing and scrambling process are combine to signal modulation module in a QAM modulator.

Conditional access and user management

Conditional Access System is the key position between Scrambling of the multiplexed programs and Subscriber Management System. Provider can control the system, add/reduce programs or embedding other business contents. By means of management and authorization, provider can achieve paid services. CAS (Conditional Access System) – security enhanced pay TV solution, and was designed to provide the most security media contents protection to operators. It can encrypt control words and user authorization information within a stable and highly secured environment, and fully compatible with DVB Simul-Crypt standard.

In order to cater to the needs of ever-expanding digital television network, the DIBSYS’s CAS enables TV operators to deploy a medium-sized TV network in initial phase and large scale by network expansion phase wherever in cable, satellite or terrestrial. Furthermore, DIBSYS’s CAS support a number of mechanisms of content protection for better operator’s investment, such as 3DES and AES encryption algorithm, smart card & STB binding, zone control, black list management and so on.

SMS (Subscriber Management System） supports flexible subscriber management and servicing operations, including value-added services such as message charging, voice charging and malfunction reporting. The system is based on modular design, so that customers are able to choose different modules and interfaces in accordance with their own needs, or request for dedicated modules and interfaces to achieve seamless merging with their existing systems. Meanwhile, we could also integrate customer’s office automation system, equipment management system and program management system onto a unified platform, with necessary redesign for system reliability and safety as a whole.

Modulation

Modulation is transmitting A/V signal into stable high frequency oscillation signal. The modulated signal could be sent to near building, family or remote terminal users via another QAM devices. You can choose your modulator according to sd/hd channels quantity.

HFC Internet 

HFC is a broadband transmission network in DVB-C system. Distributed HFC access network with redundant protection system, high safety and reliability, good expansibility and good network performance index, can provide good broadband transmission network platform for carrying out bidirectional interactive digital TV business.

The user terminal DVB receiving system

User-end devices (Set top box) provide final reception of programs and services to guests. DVB STB makes TV from passive receiving analog TV to interactive receiving digital TV and data broadcast. We provide mpeg4 AVC HD STB and mpeg2 SD STB for choice.

Packing

Delivery