1. Optical fiber

Formal fiber optic cable manufacturers generally use grade A cores from large factories. Some low-quality fiber optic cables usually use grade C, grade D fibers and smuggled fibers from unknown sources. These fibers have a long time to leave the factory and often have damp and discolored due to their complex sources. , And multimode fiber is often mixed with single mode fiber.

Second, the outer skin

The outer skin should be smooth, bright, without bubbles, with toughness and easy peeling characteristics.

Three, steel wire

The steel wire of the regular manufacturer is phosphated, the surface is gray, does not rust, and has high strength. Inferior fiber optic cables are generally replaced by thin iron or aluminum wires. The identification method is easy-it is white in appearance and can be bent at will when it is pinched in the hand.

Fourth, fiber cream

Fiber paste can prevent optical fiber from oxidizing. Few fiber paste is used in inferior fiber, which seriously affects the life of the fiber.

Five, loose tube

The PBT material with high strength, no deformation and anti-aging should be used, and the loose tube of PVC material is used for the inferior optical cable.

Six, Aramid

Aramid is a high-strength chemical fiber. Because of its high cost, some low-quality optical cables have very thin outer diameters. Such an optical cable is easy to be broken when passing through the tube.

Seven, steel armor

Regular enterprises use double-sided brushed anti-corrosion coating longitudinally wrapped steel strips, and inferior optical cables use ordinary iron sheets.

8. Water blocking tape