A technician is using a dead-zone box (launch ring) of 1000m to test a 500m fiber link. Why is the launch cable longer than the link being tested?
Answers
AThe launch cable length is irrelevant to the link length; it only needs to be long enough to overcome the OTDR launch dead zone and allow measurement of the first connector
BThis is a mistake; the launch cable must be shorter than the link
CIt ensures the OTDR pulse reflects back exactly in phase
DThe launch cable acts as an amplifier for short links
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