RED epic Operation Manual page 159

R E D D S M C O P E R AT I O N G U I D E : E P I C / S C A R L E T
4. Set Source to External: BRAIN.
The TC indicator in the Lower Status Row turns green when an external timecode source is locked.
NOTE: When an external source is selected but not present, timecode displays User Provided settings.
REQUIRED CABLE
 790-0154: 3BNC-to-00 LEMO Sync Cable
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Source: External: BRAIN
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