Pulling
Traditionally fibre optic cables were pulled through cable ducts in the same way as other cables, via a winch line. Every time a bend or undulation in the duct is passed the pulling force is multiplied by a friction dependent factor (which can be reduced by using lubricant). This means that the higher the local pulling force is, the higher the friction will be which the cable is experiencing while being pulled against the internal duct wall. This "capstan effect" leads to an exponential force build-up with pull distance, producing generally high pulling forces.
Read more about this topic: Cable Jetting
Famous quotes containing the word pulling:
“Why must it always end this way?
A dais with woman reading, with the ruckus of her hair
And all that is unsaid about her pulling us back to her, with her
Into the silence that night alone can’t explain.”
—John Ashbery (b. 1927)
“I shan’t be pulling the levers there but I shall be a very good back-seat driver.”
—Margaret Thatcher (b. 1925)
“The next moment he was “showing off” with all his might—cuffing boys, pulling hair, making faces—in a word, using every art that seemed likely to fascinate a girl and win her applause.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)