By David Groth, David McBee, Jim McBee, David Barnett
--This is the main accomplished ebook delivering cable installers, contractors, community directors, and notebook and community technicians all of the details they should recognize to paintings accurately and successfully with cables within the office.
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Extra info for Cabling: The Complete Guide to Network Wiring
In fact, virtually all four-pair UTP cables in the United States use a PVC jacket, plenum cables included. And guess what? Virtually none of the Category 5 or better cables on the market use any PVC as an insulation material for the conductors, no matter what the flame rating. So a plenum-rated cable actually has just as much PVC in it as does a so-called PVC nonplenum cable. Unless you have to be specific about one of the lesser flame ratings, you are more accurate when you generalize about cable flame ratings if you say plenum and nonplenum instead of plenum and PVC.
Companies deploying twisted-pair LANs had little guidance, to say the least. Much of the cable that was used at this company was sub–Category 3, meaning that it did not meet the minimum Category 3 performance requirements. Unfortunately, because the cabling was not even Category 3, once the 10Base-T specification was approved, many of the installed cables would not support 10Base-T cards on most of the network. So three years into this company’s network deployments, it had to rewire much of its building.
Often, it is nothing more complicated than a hole (core) that is drilled in the floor and allows cables to pass through. However, a hole between two floors with cable in it introduces a new problem. Remember the fire-disaster movie The Towering Inferno? In it, the fire spread from floor to floor through the building cabling. That should not happen nowadays because building codes require that riser cable be rated properly. So the riser cable must have certain fire-resistant qualities. TIP The National Electrical Code permits plenum cable to be used in the riser, but it does not allow riser cable to be used in the plenum.
Cabling: The Complete Guide to Network Wiring by David Groth, David McBee, Jim McBee, David Barnett