margusten kirjutas:27.5W BBC kanalite avamisest veel:
PMT is crypted
Njah, mul pole küll Iso raamatut hetkel käepärast, aga DVB standardis oli justkui kirjas, et PAT PMT tabeleid ei tohi krüptida (CSA-ga siis). Samas võibolla on siin midagi analoogset kui oli kunagi vist mingil poola provaideril, kus transponderi kõik pmt tabelid saadeti sama PID pealt. Vähemalt siis minu enda programmide skanner läks küll täiesti lolliks ( s.t. pidin sinna portsu koodi juurde kirjutama enne kui korda sai). See on nüüd selline muidujutt, pole ise uurinud konkreetset juhtumit ja pole ka võimalust, antenn niikaugele ( loe madalale) ei pööra.
Leidsin kapsa üles, seal on kirjas:
C.8.2 Program Map Table
The Program Map Table provides the mapping between a program number and the program elements that comprise it.
This table is present in Transport Stream packets having one or more privately-selected PID values. These Transport
Stream packets may contain other private structures as defined by the table_id field. It is possible to have TS PMT
sections referring to different programs carried in Transport Stream packets having a common PID value.
This Recommendation | International Standard requires a minimum of program identification: program number, PCR
PID, stream types and program elements PIDs. Additional information for either programs or elementary streams may be
conveyed by use of the descriptor() construct. Refer to C.8.6.
Private data may also be sent in Transport Stream packets denoted as carrying TS program map table sections. This is
accomplished by the use of the private_section(). In a private_section() the application decides whether version_number
and current_next_indicator represent the values of these fields for a single section or whether they are applicable to many
sections as parts of a larger private table.
NOTE 1 – Transport stream packets containing the Program Map Table are transmitted unencrypted.
NOTE 2 – It is possible to transmit information on events in private descriptors carried within the TS_program_map_section()s.
Ehk mu vana mälu ei petnudki seekord.
