3Horizontal CablesHorizontal cables run between a cross-connect panel in a wiring closet and a wall jack, are most often implemented with 100-ohm, four-pair, unshielded twisted-pair (UTP), solid-conductor cables, as specified in the ANSI/TIA/EIA-568 Standard for commercial buildings.The Standard also provides for horizontal cabling to be implemented:62.5/125-micron or 50/125-micron multimode optical fiber150-ohm shielded twisted-pair (STP) cable.(but does not recommend)
4BackboneCan be implemented using 100-ohm UTP, 62.5/125-micron or 50/125- micron multimode optical fiber, or 8.3/125-micron single-mode optical cable. Neither 150-ohm STP nor coaxial cable is allowed.Optical fiber is the preferred installation medium because of distance limitations associated with copper wiring. a fiber backbone is that glass does not conduct electricity and is thus not subject to electromagnetic interference (EMI)
5Modular Patch CablesModular patch cables (patch cords) are used to provide the connection between field-terminated horizontal cables and network-connectivity devices and connections between the wall- plate jack and network devices.Patch cords are made with stranded conductors because they are more flexible.Problems with the patch cables:The first challenge lies within the modular plugs themselves.the untwisting and splitting of the pairsthe mechanical crimping process that secures the plug to the cable
7Pick the rigth cableYou must know the installation environment and what the applicable NEC and local fire-code requirements will allow regarding the cables’ flame ratings.Your second decision on cabling must be on media type..For fiber cable, you will need to specify single-mode or multimode, and if it is multimode, you will need to specify core diameter, i.e., 62.5/125 or 50/125.For UTP cables, you need to specify the appropriate transmission-performance category.
9ANSI/TIA/EIA-569-A Commercial Building Telecommunications Pathways and Spaces Standard for concealing, protecting, and routing your cable plant. Must be electrically grounded per the ANSI/TIA/EIA-607 CommercialBuilding Grounding and Bonding Requirements for Telecommunications.
10CONDUITConduit is pipe. It can be metallic or nonmetallic, rigid or flexible and it runs from a work area to a wiring closet. Only 40 percent full by your current cable needs. Conduit should only be filled to a maximum of 60 percent, so this margin leaves you with room for future growth.
11Cable TraysCable trays are typically wire racks specially designed to support the weight of a cable infrastructure. Cables simply lie within the tray, so they are very accessible when it comes to maintenance and troubleshooting.
15Fiber-Protection Systems As with raceways, fiber-protection systems are special types of conduits and cable- management systems designed specifically to address the special protection needs of optical-fiber cable. Although maintaining is important for all cable media, cable will eventual signal loss, which translates to lost data, troubleshooting, downed network connections, and lost productivity.
20Additional requirements There shall be a minimum of two dedicated 120V 20A nominal, nonswitched, AC duplex electrical-outlet receptacles, each on separate branch circuits.There shall be a minimum of one room per floor to house telecommunications equipment/ cable terminations and associated cross-connect cable and wire.Lighting shall be a minimum of 500 lx (50 footcandles) and mounted 2.6 m (8.5 feet) above the floorThere shall be a minimum door size of 910 mm (36 inches) wide and 2,000 mm (80 inches) high without sill, hinged to open outward or slide side-to-side or be removable,
21Wall-Mounted Brackets For small installations and areas where economy of space is a key consideration, wall-mounted brackets may provide the best solution. Wall-mounted racks such as MilesTek’s Swing Gate wall rack in Figure 5.9 have a frame that swings out 90 degrees to provide access to the rear panels and include wire guides to help with cable management.
22Wall-Mounted Brackets wall-mount rack with cable managementSkeletal Frames
23Wall-Mounted Brackets Full Equipment CabinetsShelves available for 19-inch racks
24Electrical Grounding Electrical Grounding Cross-Connect Devices The 66 Punch-Down Blocks