Atsc working Draft Template

major_channel_number
, 
minor_channel_number
– These two 10-bit fields represent either a two-part 
or a one-part virtual channel number associated with the virtual channel being defined in this 
iteration of the “for” loop
11
. The one- or two-part number acts as the user’s reference number 
for the virtual channel. Some channels in the CVCT may be represented with a one-part number 
while others are represented with two-part numbers. Channel number values shall be set such 
that in no case is a 
major_channel_number
/
minor_channel_number
pair duplicated within the CVCT. 
To specify a two-part channel number, both the 
major_channel_number
and the 
minor_channel_number
fields shall be below 1000. To specify a one-part channel number, the six most 
significant bits of 
major_channel_number
shall be ‘11 1111’. Values and combinations of 
major_channel_number
and 
minor_channel_number
falling outside these ranges are reserved. The one-
part channel number is a 14-bit quantity that shall be computed by the following formula, 
represented in C syntax: 
one_part_number
= (
major_channel_number & 0x00F) << 10 + minor_channel_number
11
Note that these semantics permit these two forms of virtual channel numbers, in separate 
iterations of the “for” loop, to identify the same set of program elements. 
35 

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ATSC A/65:2013 
Program and System Information Protocol 
7 August 2013 
Table 6.8 Bit Stream Syntax for the Cable Virtual Channel Table 
Syntax 
No. of Bits 
Format 
cable_virtual_channel_table_section() { 
 
table_id 
8 
0xC9 
 
section_syntax_indicator 
1 
‘1’