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Directed channel change selection code table (DCCSCT) [ATSC Syntax]

Directed Channel Change Selection Code tables enable an ATSC transport to update some of the fields of data in suitably-equipped receivers. The data elements cover program "genre" labels and location information such as state and county name.

packetization characteristics
packet idunique pidt_s_ca_f_cp_u_s_ipointer_fieldlisted in MGT
per MGTper K-number'00''01'True0-182By k-number
maximums
ms per sectionsections per
EIT-k instance
instances per
virtual channel
bytes per
section
total
EIT bps
500 (rec.,EIT-0)25614096250,000

DCCSCTs are optional. The codes used in DCCTs can be updated by employing optional Directed Channel Change Selection Code tables (DCCSCTs).

DCCSCTs, if present in an ATSC transport stream, must be listed in the Master Guide Table (MGT)

section syntax
syntaxbit index# of bitsmnemonic
table_id08212 / 0xD4
section_syntax_indicator81'1'
private_indicator91'1'
reserved102'11'
section_length1212uimsbf
dccsct_type24160 / 0x0000
reserved402bslbf
version_number425uimsbf
current_next_indicator471'1'
section_number4880 / 0x00
last_section_number5680 / 0x00
protocol_version6480 / 0x00
updates_defined728uimsbf
for i = 1 to updates_defined
  update_type808uimsbf
  update_data_length888uimsbf
  if update_type == new_genre_category
    genre_category_code968uimsbf
    genre_category_name_text104var 
  if update_type == new_state
    dcc_state_location_code968uimsbf
    dcc_state_location_code_text104var 
  if update_type == new_county
    state_code968uimsbf
    reserved1046'111111'
    dcc_county_location_code11010uimsbf
    dcc_county_location_code_text120var 
  end if
  reserved 6'111111'
  dccsct_descriptors_length 8uimsbf
  dccsct_descriptors var 
next i
reserved 6'111111'
dccsct_additional_descriptor_length 10uimsbf
dccsct_additional_descriptors var 
CRC_32 32rpchof
Table section legend
Note: bit index is only indicated for the first time through the update loop.
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