Instruction manual

JUPITER CM-4400 Control Module Installation and Operating Manual 195
The Sequential Path Finding Table
Figure 143. Example of Sequential Path Finding Connections
Path finding is not the same as three-stage switching. Path finding involves
discrete switchers connected by a small number of tie lines, the number of
which strictly limits the inputs available at the downstream switcher.
The control panel will indicate “Blocked” if
all of the tie lines are busy and
an attempt is made to switch to an additional upstream source. In order to
release a tie line, a downstream output using a tie line must be switched to
a local input. In the example shown in Figure143, “MainRout” output 55
could be switched to VT16, or some other source known to be a local input
(such as black burs
t). In some cases, it might be necessary to switch more
than one downstream output to a local source, since the tie line could be
feeding more than one destination. Since it may be difficult to determine
the overall usage of a given tie line, the operator should switch away from
the upstream switcher source when it is no longer needed.
17 18 19 20 21 22 23 24 25
6
7
8
9
10
11
12
13
14
38 39 40 41 42 43 44 45 46 47 48
55
56
57
58
59
60
61
62
63
64
Distribution
switcher
“NEWSROUT”
Distribution
switcher
“MAINROUT”
65
VT16
VT15
VT22
VT21
In this example, this group of tie
lines is named “VNEWMAIN” (vid-
eo, NEWSROUT to MAINROUT).
Other naming schemes could use
“GROUP1,” or, more elaborate
names like “V5N10M43,” meaning
“Video, 5 News lines starting at
output 10 to Main router starting
at input 43,” etc.)
In this example, this group of tie
lines is named “VMAINNEW.”
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