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Kinks and sharp bends can destroy or impair the cable's ability to
Note:
convey light pulses accurately from one end of the cable to the other.
Use care in dressing the optical fiber cables: provide satisfactory
strain relief to support the cable and maintain an adequate bend
radius at all cable turns, particularly where the cable connects to the
I/O module.
Figure 15. Bend radius for fiber optic cable
Radio Frequency Interference
If you use UTP cabling in an installation, take precautions to avoid RF interference. RF
interference can cause degradation of signal quality, and, in an Ethernet network
environment, can cause excessive collisions, loss of link status, or other physical layer
problems that can lead to poor performance or loss of communication.
To prevent RF interference, avoid the following situations:
Attaching UTP cable to AC power cables
•
Routing UTP cable near antennas, such as an amateur radio antenna
•
Routing UTP cable near equipment that could exhibit RF interference, such as ARC
•
welding equipment
Routing UTP cable near electrical motors that contain coils
•
Routing UTP cable near air conditioner units
•
Routing UTP cable near electrical transformers
•
In areas or applications where these situations cannot be avoided, use fiber optic cabling or
shielded twisted pair cabling (STP).
38 |
Chapter 4. Site Preparation
8800 Series Chassis Switch Hardware Installation Guide
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