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:
“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)
“An amoeba is a formless thing which takes many shapes. It moves by thrusting out an arm, and flowing into the arm. It multiplies by pulling itself in two, without permanently diminishing the original. So with words. A meaning may develop on the periphery of the body of meanings associated with a word, and shortly this tentacle-meaning has grown to such proportions that it dwarfs all other meanings.”
—Charlton Laird (b. 1901)
“I shan’t be pulling the levers there but I shall be a very good back-seat driver.”
—Margaret Thatcher (b. 1925)