Making an Ethernet twisted pair cable
Cut the cable to a required length with the crimping pliers.
Strip off an appropriate length of the cable sheath. The length is typically that of the RJ-45
Untwist the pairs so that they can lay flat, and arrange the colored wires based on the wiring
Cut the top of the wires even with one another. Insert the wires into the RJ-45 end and make sure
the wires extend to the front of the RJ-45 end and make good contact with the metal contacts in the
RJ-45 end and in the correct order.
Crimp the RJ-45 connector with the crimping pliers until you hear a click.
Repeat the above steps with the other end of the cable.
Use a cable tester to verify the correct connectivity of the cable.
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
Optical fibers are widely used in fiber-optic communications, which are advantageous for long-distance
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
Table 57 Allowed maximum tensile force and crush load
Period of force
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.
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.
Tensile load (N)
Crush load (N/mm)