CAS (Conditional Access System)

CAS system

Gospell CA has been severely tested by the State Administration of Radio, Film and elevision, and now Gospell CA is certificated as one of the national standard CAs in China, and has already been widely used in domestic and international markets.

DVB standard compatible. Adopt DES encrypting arithmetic to carry out CA

The CAS server can control many scramblers through TCP/IP interface. STBs conditionally descramble the signals according to commission information of the receiving cards,and then finish the charge of digital TV subscribers and other relative management.

 Compositions and Functions

•               CAS software------the head system is made up of these modules like ECMG, EMMG, scrambler supervision software and so on; the end system is STB with IC card and COS software.


•               Server------it runs CAS software, carries out the LAN connection and remote network connection through SWITCH


•               SWITCH------information exchange between server and scrambler through TCP/IP.


•               Scrambler------it scrambles and encrypts TS, carries out CA receiving.