reply to rody_44 Tell that to the trunk guys at Manhattan Cable Televsion. In 1988, they softened the dialectic in existing underground trunk cables using large jolts of electric current, making it possible to pull out the insides and easily install this new fangled thing called fiber.
They avoided the major expense of building new ducts and opening many trenches at the then upsurd price of $92 per foot. Worked like a charm. We ended up with no active devices from the headend at 23rd Street all the way up to East 86th Street.
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