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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
GROUP 1
OUTPUT
(1
CHANNELS
SUBRACK ID
(001
NUMBER
The first digit determines the group of video output channels (1
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.
Rev. B
GROUP 2
GROUP 3
32)
(33
64)
(65
96)
099) (101
199) (201
299) (301
Figure 3.9: Grouping Of Subracks
GROUP 4
GROUP 5
GROUP 6
(97
128)
(129
160)
(161
399) (401
499) (501
3-12
GROUP 7
GROUP 8
192)
(193
224)
(225
256)
599) (601
699) (701
799)
8) that the subrack
HMXMC001013
31-Mar-06
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