H3C Technologies H3C S7500E Series Switches - Manual (Page 141)

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4. 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.
5. Crimp the RJ-45 connector with the crimping plier until you hear a click.
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, 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 84 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.