MPEG PSI SI
MPEG - Moving Picture Expert Group
This is a international standard used for the compression of Moving Picture and Audio both.
MPEG PSI
The STB requires the re-assembling of the content to display the component that is why we need a “Content page” which has set of tables are called PSI program specific Information.
PSI contains mainly three things,
1) PAT:- Program Association Table
2) PMT:- Program MAP Table
3) CAT:- Conditional Access Table
1) PAT:-
(a) This gives the list of all the program available in the Transport Stream.
(b) It also gives the PMT PID.
2) PMT:-
(a) It shows the PCR PID.
(b) It shows the Component PID.
(c) It also shows the component types i.e. Component Descriptor(Language Descriptor)
and CA Descriptor(ECM).
3) CAT:-
It describes the conditional access system and their EMM (protects the data from unauthorized user).
DVB SI
It is designed for the human interface for to display the services and Program information.
It enables,
(a) NVOD
(b) EPG
(c) P/F (Present Following Banner)
(d) MOSAICS
(e) Time Shifted Services
DVB SI contains the following tables,
(a) NIT :- Network Information Table
(b) BAT:- Bouquet Association Table
(c) SDT-A :- Service description Table
(d) SDT-O :- Service Description Table
(e) EIT P/F Actual (Event Information Table P/F)
(f) EIT PF Other (Event Information Table P/F)
(g) EIT Schedule Other
(h) TDT (Time Date Table)
(j) TOT (Time offest Table)
(a) NIT :-
It describes the delivery system paramerts of all the transport stream in the Network.
It contains Linkage Descriptors
NIT Actual and NIT other
(b) BAT :-
In a bouquet the services are potentially available and can be blocked by CA System
It contains Linkage Descriptor
(c) SDT-A :-
It describes the services names and status of services running or not in the current system.
Service types are TV,NVOD,Radio and Interactive etc.
(d) SDT-O :-
It describes the service names in the other Transport Stream
(e) EIT (P/F)-A :-
It sends the program information on the current TS
(f) EIT (P/F)-O :-
It sends the program information on all other TS.
(g) EIT SC-A :-
It contains the program name, starts time, ends time and all EPG information on current TS.It contains 8 days EPG.
(h) EIT (SC)-O :-
It contains all program information on all other TS.
(i) TDT :-
It is used for to update the date and time of the internal clock of STB with the UTC.Which is generated by the MUX or iStreamer.
(j) TOT :-
It is usend to support Local Time Offsests from UTC i.e. INDIA = UTC+5:30
This was all about the MPEG PSI SI Tables.
