Ops 4–12 • Switcher Basics Vision Operator’s Manual (v12.0 MD)
Re-entry
Re-entry is the term used to describe the process of selecting another MLE on an MLE. For
example, if you select MLE 5 on MLE 1, MLE 5 is said to be re-entered onto MLE 1. Re-entry
takes the output of an MLE and uses it as the background or key on the other MLE. If you select
an MLE on the background bus, the MLE becomes background video source of the other MLE. If
you select an MLE on a Key Bus, the MLE becomes the key source of the other MLE.
When working with re-entries, there are a number of rules that specify what can and cannot be
done. These rules are as follows:
• You cannot re-enter an MLE onto an MLE that is re-entered into the first MLE unless
Re-entry Loops is turned on. For example, MLE 1 cannot be re-entered into MLE 3
when MLE 3 is already re-entered into MLE 1.
• You cannot re-enter an MLE, or the Clean Feed of an MLE, into itself.
• The Program/Preset MLE cannot be re-entered into another MLE if the Mix/DSK or
MultiDSK options are installed.
• Re-entry chains of more than 4 MLEs can cause line drops. Any combination of MLEs
can be re-entered safely, as long as there are less than 5 MLEs in the chain.
• You cannot create a re-entry chain of more than 4 MLEs unless the Re-entry Depth
personality option is set to Warn or Allow.
Use the following procedure to re-enter a MLE 1 onto MLE 2:
1. Set up MLE 1 with a background and a key (Figure 4.8).
Figure 4.8 MLE 1
2. Set up MLE 2 with a key (Figure 4.9).
Figure 4.9 MLE 2
3. Select MLE 1 as a source on the Background Bus of MLE 2 (Figure 4.10). Notice that
the output of MLE 1 is now being used as the background of MLE 2.
Figure 4.10 MLE 1 Re-entered onto MLE 2
MLE1 Background
MLE1
Key1
MLE2
Key1
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