74
6.
Repeat the above steps with the other end of the cable.
7.
Use a cable tester to verify the connectivity of the cable.
Optical fiber
CAUTION:
Use the same types of transceiver modules, pigtail cords, patch cords, and fiber cables. If you use
single-mode optical fibers, the transceiver modules, pigtail cords, patch cords, and fiber cables must
be single-mode.
Optical fiber
Optical fibers are widely used in fiber-optic communications, which are advantageous for
long-distance communications.
Optical fibers can be classified into the following types:
•
Single mode fiber
—It has a core size of 10 µm or smaller, and has a lower modal dispersion. It
carries only a single ray of light. It is mostly used for communication over longer distances.
•
Multi-mode
fiber
—It has a core size of 50 µm or 62.5 µm or higher, and has a higher modal
dispersion than single-mode optical fiber. It is mostly used for communication over shorter
distances.
Table 57 Allowed maximum tensile force and crush load
Period of force
Tensile load (N)
Crush load (N/mm)
Short period
150
500
Long term
80
100
Optical fiber cable
An optical fiber cable is a cable containing one or more optical fibers. The optical fiber elements are
typically individually coated with plastic layers and contained in a protective tube. Optical fiber cables
fall into single-mode and multi-mode.
Patch cord
A fiber that has connectors at both ends is called a patch cord. A patch cord connects one optical
device to another for signal routing. Patch cords fall into single-mode and multi-mode patch cords.
•
Single-mode patch cord
—The jacket is yellow. It permits transmission over longer distances.
•
Multi-mode
patch
cord
—The jacket is orange. It permits transmission over shorter distances.
Patch cords are classified into SC, LC, FC, and so on based on interface type. The length of a patch
cord can be 0.5 m (1.64 ft), 1 m (3.28 ft), 2 m (6.56 ft), 3 m (9.84 ft), 5 m (16.40 ft), 10 m (32.81 ft),
and so on.
