As tenants come and go in a commercial building, the cabling infrastructure sometimes leaves behind abandoned Cat5, Cat6 and coax cabling. All that needs to happen is for the new tenant to request a reconfigured layout that relocates the main wall closet. Or, sometimes the old tenant will cut away the cabling in order to take the patch panels with them. If possible, keep the wall closet location. And always offer to buy the patch panels from a departing tenant.
A magnetic field when running low voltages. Unfortunately, when this unshielded cabling creates a magnetic field created. Any electrical cabling bear by disrupts communication, slowing transmission or preventing Network cabling is a tricky. Even with a solid background, technicians without adequate knowledge and training can make mistakes that may shut down an entire system. Here are some typical mistakes seen in network cabling.
Plan for the Future. Cat5 may be the cheaper option, but can cause problems when upgrading is needed. Install Cat5e or Cat6 cables with options for upgrades to save labor costs.
Don’t Mix and Match. Twisted pair cabling was often out of the price range for many companies, so priority was given to data, while voice had with cheaper cabling. Now, VoIP has made voice equal to data in importance and need. Fortunately, a typical VoIP phone has a built-in Ethernet connection or pass-thru that is compatible with almost any data cable, which decreases installation costs.
Don't put Electrical Cables Next to Data Cables. Data cables use twisted pairs of wires inside that help produce transmissions altogether. This generally happens when the cables are running parallel, so if your cable is near a power line, lay them perpendicular to the power line.
Not Laying New Cable When You Need To. Ethernet switches are convenient, but can be misused. Mini-switches are often added to provide a few extra ports; but this can cause bottlenecks and instability. Add extra cable instead, if more network resources are needed.
Forgetting Cable Management. “Ladder racks” add extra cost to an installation, but they also make the installation look better, run better, and easier to maintain and update. Also, don't forget to color code or label your cables, so technicians can actually find the right cable later.
When a new office design is in its initial stages, it is critical to consider proper handling of utilities, power water and cabling inside the walls and ceiling. For cabling, it is necessary to use hooks to hold the cables above the drop ceiling. When the installation of cable involves large numbers of cables traversing lengthy expanses, it is normal to install cable ladder trays up in the ceiling to carry the bulk of the cable along the main corridors of the office. Cable ladders vary in quality and cable handling capabilities. The amount of cable and the budget of the project will determine the type of cable ladder that will be built.
A higher quality cable ladder will, in the long run, save time and money during the installation phase of a cabling project. The alternative to a cable tray is to install cable conduit. Considerations in choosing to use a cable ladder tray system include the following:
Optical fiber is an effective medium for networking because it is flexible and can be bundled as cables. It is especially advantageous for long-distance network 
communications, because light propagates through the fiber with little attenuation compared to electrical cables. This allows long distances to be spanned with few or no repeaters. Additionally, the per-channel light signals propagating in the fiber can be easily modulated at 1 Gb/s.
Fiber cable saves space in cable ducts because a single fiber can carry much more data than a single standard data cable. Fiber is also immune to electrical interference; there is no cross-talk between signals in different cables and no pickup of environmental noise. Non-armored fiber cables do not conduct electricity, which makes fiber a good solution for protecting communications equipment located in high voltage environments such as power generation facilities, or metal communication structures prone to lightning strikes. They can also be used in environments where explosive fumes are present, without danger of ignition. Wiretapping is also more difficult compared to electrical connections, and there are concentric dual core fibers that are said to be tap-proof.
Both multi-mode and single-mode fibers are used in communications, with multi-mode fiber used mostly for sho
rt distances, up to 550 m (600 yards), and single-mode fiber used for longer distance links. Because of the tighter tolerances required to couple light into and between single-mode fibers (core diameter about 10 micrometers), single-mode transmitters, receivers, amplifiers and other components are generally more expensive than multi-mode components.
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