Rev. B
3-12
HMXMC001013
31-Mar-06
3.6 SUBRACK
ADDRESSING
Every subrack is given a unique ID number to facilitate the correct distribution of control
data to and from every module in the system.
Video switching subracks support a maximum of (32) video output channels. In larger
systems subracks handling a particular group of (32) channels are identified by an offset
in the hundreds digit of the subrack ID number.
Refer to the following table:
VIDEO
OUTPUT
CHANNELS
GROUP 1
(1 32)
GROUP 2
(33 64)
GROUP 3
(65 96)
GROUP 4
(97 128)
GROUP 5
(129 160)
GROUP 6
(161 192)
GROUP 7
(193 224)
GROUP 8
(225 256)
SUBRACK ID
NUMBER
(001 099) (101 199) (201 299) (301 399) (401 499) (501 599) (601 699) (701 799)
Figure 3.9: Grouping Of Subracks
The first digit determines the group of video output channels (1 8) that the subrack
supports.
A System With 30 Video Output Channels
A video system having 30 video output channels has a subrack ID range from (001
099).
In the following example, three subracks are used. The first two subracks are cascaded
together and the (30) output channels from the second subrack go through text inserters
in the third subrack.
