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 Schofield Kid: It don’t seem real, how he ain’t gonna never breathe again, ever. How he’s dead, and the other one, too. All on account of pulling a trigger.
Will Munny: It’s a hell of a thing, killing a man. You take away all he’s got and all he’s ever gonna have.”
—David Webb Peoples, screenwriter. The Schofield Kid (Jaimz Woolvett)
“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)
“Our kids will develop a work ethic only if we require them to pay a portion of the cost of some of the things they want. They’ll learn to defer gratification the moment we stop routinely pulling out our wallets. And they’ll learn self-discipline only if we care enough to enforce reasonable limits.”
—Fred G. Gosman (20th century)