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Aggregate Extended Text tables [ATSC Syntax]

Aggregate Extended Text tables are used to transmit Extended Text messages which provide detailed descriptions of events listed in Aggregate Event Information tables.

packetization characteristics
packet id	unique pid	t_s_c	a_f_c	p_u_s_i	pointer_field	listed in MGT
per MGT	same as AEIT-k	'00'	'01'	True	0-182	By k-number

maximums
sections per AETT-k instance	bytes per section	AETT_pid bps
256	4096	250,000

section syntax
syntax	bit index	# of bits	mnemonic
table_id	0	8	215 / 0xD7
section_syntax_indicator	8	1	'1'
private_indicator	9	1	'1'
reserved	10	2	'11'
section_length	12	12	uimsbf
AETT_subtype	24	8	uimsbf
MGT_tag	32	8	uimsbf
reserved	40	2	bslbf
version_number	42	5	uimsbf
current_next_indicator	47	1	'1'
section_number	48	8	uimsbf
last_section_number	56	8	uimsbf
if AETT_subtype==0
num_blocks_in_section	64	8	uimsbf
for i = 1 to num_blocks_in_section
ETM_id	72	32	uimsbf
reserved	104	4	'1111'
extended_text_length	108	8	bslbf
extended_text_message	184	var	bslbf
next
else
reserved	72	n*8	bslbf
end if
CRC_32		32	rpchof
Table section legend
Note: bit index is only indicated for the first time through the loop.

Ref: ATSC A/81, Table 9.8

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