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:
“I shan’t be pulling the levers there but I shall be a very good back-seat driver.”
—Margaret Thatcher (b. 1925)
“When the masculine mystique is pulling boys and men out into the world to growl manly noises at one another, the only power with a stronger pull on the male psyche is maternally induced guilt. The guilt is quite necessary for our moral development, but it is often uncomfortable.”
—Frank Pittman (20th century)
“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)