EQUIPO 2
Cabling
system
EQUIPO
2
components2
EQUIPO
The cable
Horizontal Cables
• Horizontal 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 fiber
▫ 150-ohm shielded twisted-pair (STP) cable.(but does not recommend)
Backbone
• Can be implemented using 100-ohm UTP, 62.5/125-micron or 50/125micron 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)
Modular Patch Cables
• Modular patch cables (patch cords) are used to provide the
connection between field-terminated horizontal cables and
network-connectivity devices and connections between the wallplate 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 pairs
▫ the mechanical crimping process that secures the plug to the cable
Pick the rigth cable
• You 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.
Cabling pathways
ANSI/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.
CONDUIT
Conduit 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.
Cable Trays
Cable 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.
Raceways
Raceways are special types
of conduits used for surface
mounting horizontal cables
are mounted on the outside
of a wall in places where
cable is not easily installed
inside the wall.
Fiber-Protection Systems
As with raceways, fiber-protection systems
are special types of conduits and cablemanagement 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.
Conectores y terminales fijas
Wiring Closets
TIA / EIA
• ANSI/TIA/EIA-568-B
• ANSI/TIA/EIA-569-A
Additional 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 floor
• There 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,
Wall-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.
Wall-Mounted Brackets
wall-mount rack with cable
management
Skeletal Frames
Wall-Mounted Brackets
Full Equipment Cabinets
Shelves available for 19-inch
racks
Electrical Grounding
• Electrical Grounding
• Cross-Connect Devices
• The 66 Punch-Down Blocks
Modular Patch Panels
Fiber-Optic Connector Panels
A fiber-optic connector panel
A consolidation
point
Administration Standards
NOTE. Network
administrators should be
judged by the neatness of
their wiring closets.