National Fiber Contractors has BICSI certified
installers fully versed in fiber optic distribution designs and installations
for a wide range of fiber optic network applications. We can help you integrate
data and telecommunication networks over fiber effectively .
Our
certified RCDD, Certified Network Specialist and BICSI Technicians work as team
to bring the latest fiber optic technologies to our customers. We provide design,
installation , and certifications of fiber optic cabling systems in central offices,
POP sites, commercial, and residential sites
Our
certified RCDDs and LAN/WAN Specialists work closely with contractors and end
users to deliver the latest cabling technologies that best suit the needed applications.
All
fiber optic cabling system designs are reviewed and installations quality checked
by a Registered Communications Distribution Designer (RCDD). This is a professional
designation of the Building Industry Consulting Services International (BICSI).
We ensure that the fiber optic cabling system design,
components, and workmanship comply with the standards and practices of BICSI.
These standards and practices are elaborated in the Telecommunications Distribution
Methods Manual, the EIA/TIA Telecommunications Building Wiring Standard, The National
Fire Protection Assn., and the National Electrical Code (NFPA-70).
Our
fiber optic certifications, extensive experience on fiber optics installation, and
knowledge of fiber optic technologies and standards are key factors in our successful
delivery of fiber network solutions. leading fiber optic suppliers. Together we
can deliver the solution that best meets your application needs, now and long
term.
Our services include:
- Design and Installation of Fiber Optic Cabling
- Fiber
Optic Termination
- Light Interconnection Units
and Fiber Shelves
- Testing and Certifications
- Fiber
Tray and Raceway
- Fiber Innerduct
- Wall-mount
and Freestanding Cabinets and Racks
- Fiber Optic
Fusion and Mechanical Splicing
Our certified RCDDs
a nd LAN/WAN Specialists work closely with contractors and end users to deliver
the latest cabling technologies that best suit the needed applications
All
fiber optic cabling system designs are reviewed and installations quality checked
by a Registered Communications Distribution Designer (RCDD). This is a professional
designation of the Building Industry Consulting Services International (BICSI).
We ensure that the fiber optic cabling system design,
components, and workmanship comply with the standards and practices of BICSI.
These standards and practices are elaborated in the Telecommunications Distribution
Methods Manual, the EIA/TIA Telecommunications Building Wiring Standard, The National
Fire Protection Assn., and the National Electrical Code (NFPA-70).
WARRANTY
Our
fiber optic cabling installations are supported by extended warranties that guarantees
both end to end performance and application assurance for you. Our technicians
are certified on every product installation that we design and are well trained
on the industry structured cabling standard.
The specific
standards of the EIA/TIA Building Telecommunications Wiring Standards are:
· EIA/TIA-568A (Commercial Building Telecommunications
Wiring Standard)
· EIA/TIA-569 (Commercial Building Standard for Telecommunications
Pathways and Spaces)
· EIA/TIA-570 (Residential and Light Commercial
Telecommunications Wiring Standard)
· EIA/TIA-606 (Administration
Standard for Telecommunications Infrastructure of Commercial Buildings)
·
EIA/TIA-607 (Commercial Building Grounding and Bonding Requirements for Telecommunications)
· EIA/TIA-TSB-67 (Transmission Performance Specifications for Field
Testing of UTP Cabling Systems)
Safety
in Fiber Optic Installations
All Our Technicians Are Trained In Fiber Optics Termination and Fiber Optics Safety
When most people think of safety in fiber optic installations, the first thing
that comes to mind is eye damage from laser light in the fiber. They have an image
of a laser burning holes in metal or perhaps burning off warts. While these images
may be real for their applications, they have little relevance to most types of
fiber optic communications. Eye safety is an issue, but usually not from light
in the fiber. However, fiber optics installation is not without risks.
Eye
Safety
Optical sources used in fiber optics, especially LEDs used in premises
networks, are of much lower power levels than used for laser surgery or cutting
materials. The light that exits an optical fiber is also spreading out in a cone,
so the farther away from the end of the fiber your eye is, the lower the amount
of power your eye receives. The infrared light in fiber optic links is at a wavelength
that cannot penetrate your eye easily because it's absorbed by the water in your
eyeball.
That being
said, it's not a good idea to look into a fiber unless you know no source is being
transmitted down it. Since the light is infrared, you can't see it, which means
you cannot tell if there is light present by looking at it. Especially if you
are using a microscope, which can focus the light into your eye, you should always
check the fiber with a power meter before examining it.
The real issue of
eye safety is getting fiber scraps into the eye. As part of the termination and
splicing process, you will be continually exposed to small scraps of bare fiber,
cleaved off the ends of the fibers being terminated or spliced. These scraps are
very dangerous. If they get into your eyes, they are very hard to flush out and
will probably lead to a trip to the emergency room at the hospital. Whenever you
are working with fiber, wear safety glasses!
Bare Fiber Safety
The
broken ends of fibers and scraps of fiber created during termination and splicing
can be extremely dangerous. The ends are extremely sharp and can easily penetrate
your skin. They invariably break off and are very hard to find and remove. Sometimes
a pair of tweezers and perhaps a magnifying glass will get them out. Most of the
time, you have to wait to let them infect and work themselves out, which can be
painful!
Be careful when handling fibers to not stick the broken ends into
your fingers. Dispose of all scraps properly. Some people keep a piece of double
stick tape on the bench to stick fiber scraps onto. I prefer to use a dedicated
container for all fiber scraps. In our training programs, we use the same paper
containers used for takeout at the deli, in the pint size, with a lid. We put
all the scraps in the container, tehn when finished, put on the lid, tape it and
dispose of it later. Do not drop fiber scraps on the floor where they will stick
in carpets or shoes and be carried elsewhere-like home!
Obviously do not eat
or drink anywhere near the work area. Fiber scraps can get into food or drink
and be swallowed. The scraps can imbed themselves in you digestive system and
never be found. Doesn't sound too appetizing, does it?!
Materials
Safety
Fiber optic splicing and termination use various chemical cleaners
and adhesives as part of the processes. Normal handling procedures for these substances
should be observed. If you are not certain of how to deal with them, ask the manufacturer
for a MSDS. Always work in well-ventilated areas. Avoid skin contact as much as
possible, and stop using chemicals that cause allergic reactions. Even simple
isopropyl alcohol, used as a cleaner, is flammable and should be handled carefully.
Fire Safety
Note that fusion splicers use an electric
arc to make splices, so care must be taken to insure no flammable gasses are contained
in the space where fusion splicing is done. Splicing is never done in manholes
where gasses can accumulate. The cables are brought up to the surface into a splicing
trailer where all fiber work is done. Of course the splicing trailer is temperature-controlled
and kept spotlessly clean to insure good splicing.
Smoking should also not
be allowed around fiber optic work. The ashes from smoking contribute to the dirt
problems with fibers, in addition to the chance of explosions due to the presence
of combustible substances.
Electrical Safety
You might
be wondering what electrical safety has to do with fiber optics. Well fiber cables
are often installed around electrical cables. Electricians are well-trained in
electrical safety, but some fiber optic installers are not. We've heard rumors
of fiber installers being shocked when working around electrical cables, but know
that two fiber installers were killed when working on aerial cables because we
heard about it from OSHA.
These two installers were installing all-dielectric
self-supporting aerial cables on poles. The hangers, however, were metal and over
six feet long. Both had attached the hangers to the poles, then when installing
the fiber cables had rotated the hangers enough to contact high-voltage lines.
So even if the fiber is not conductive, fiber hardware can conduct electricity
or the installer can come in contact with live electrical wires when working in
proximity to AC power.
Fiber Optic Installation Safety Rules:
1.
Keep all food and beverages out of the work area. If fiber particles are ingested
they can cause internal hemorrhaging
2. Wear disposable aprons to minimize
fiber particles on your clothing. Fiber particles on your clothing can later get
into food, drinks, and/or be ingested by other means.
3. Always wear safety
glasses with side shields and protective gloves. Treat fiber optic splinters the
sarne as you would glass splinters.
4. Never look directly into the end of
fiber cables until you are positive that there is no light source at the other
end. Use a fiber optic power meter to make certain the fiber is dark. When using
an optical tracer or continuity checker, look at the fiber from an angle at least
6 inches away from your eye to determine if the visible light is present..
5. Only work in well ventilated areas.
6. Contact wearers must not handle
their lenses until they have thoroughly washed their hands.
7. Do not touch
your eyes while working with fiber optic systems until they have been thoroughly
washed.
8. Keep all combustible materials safely away from the curing ovens.
9. Put all cut fiber pieces in a safe place.
10. Thoroughly clean your work
area when you are done.
11. Do not smoke while working with fiber optic systems.
BRIEF
OVER VIEW OF FIBER OPTIC CABLE ADVANTAGES OVER COPPER:
SPEED: Fiber optic networks operate at high speeds - up into the gigabits
BANDWIDTH: large carrying capacity
DISTANCE: Signals can be transmitted
further without needing to be "refreshed" or strengthened.
RESISTANCE: Greater resistance to electromagnetic noise such as radios, motors
or other nearby cables.
MAINTENANCE: Fiber optic cables costs much less
to maintain.
In
recent years it has become apparent that fiber-optics are steadily replacing copper
wire as an appropriate means of communication signal transmission. They span the
long distances between local phone systems as well as providing the backbone for
many network systems. Other system users include cable television services, university
campuses, office buildings, industrial plants, and electric utility companies.
A
fiber-optic system is similar to the copper wire system that fiber-optics is replacing.
The difference is that fiber-optics use light pulses to transmit information down
fiber lines instead of using electronic pulses to transmit information down copper
lines. Looking at the components in a fiber-optic chain will give a better understanding
of how the system works in conjunction with wire based systems.
At
one end of the system is a transmitter. This is the place of origin for information
coming on to fiber-optic lines. The transmitter accepts coded electronic pulse
information coming from copper wire. It then processes and translates that information
into equivalently coded light pulses. A light-emitting diode (LED) or an injection-laser
diode (ILD) can be used for generating the light pulses. Using a lens, the light
pulses are funneled into the fiber-optic medium where they transmit themselves
down the line.
Think
of a fiber cable in terms of very long cardboard roll (from the inside roll of
paper towel) that is coated with a mirror.
If you shine a flashlight in one
you can see light at the far end - even if bent the roll around a corner.
Light
pulses move easily down the fiber-optic line because of a principle known as total
internal reflection. "This principle of total internal reflection states
that when the angle of incidence exceeds a critical value, light cannot get out
of the glass; instead, the light bounces back in. When this principle is applied
to the construction of the fiber-optic strand, it is possible to transmit information
down fiber lines in the form of light pulses.Fiber optic cable functions as a
"light guide," guiding the light introduced at one end of the cable
through to the other end. The light source can either be a light-emitting diode
(LED)) or a laser.
The
light source is pulsed on and off, and a light-sensitive receiver on the other
end of the cable converts the pulses back into the digital ones and zeros of the
original signal.
Even
laser light shining through a fiber optic cable is subject to loss of strength,
primarily through dispersion and scattering of the light, within the cable itself.
The faster the laser fluctuates, the greater the risk of dispersion. Light strengtheners,
called repeaters, may be necessary to refresh the signal in certain applications.
While
fiber optic cable itself has become cheaper over time - a equivalent length of
copper cable cost less per foot but not in capacity. Fiber optic cable connectors
and the equipment needed to install them are still more expensive than their copper
counterparts.
The
use of fiber-optics was generally not available until 1970 when Corning Glass
Works was able to produce a fiber with a loss of 20 dB/km. It was recognized that
optical fiber would be feasible for telecommunication transmission only if glass
could be developed so pure that attenuation would be 20dB/km or less. That is,
1% of the light would remain after traveling 1 km. Today's optical fiber attenuation
ranges from 0.5dB/km to 1000dB/km depending on the optical fiber used. Attenuation
limits are based on intended application.
The
applications of optical fiber communications have increased at a rapid rate, since
the first commercial installation of a fiber-optic system in 1977. Telephone companies
began early on, replacing their old copper wire systems with optical fiber lines.
Today's telephone companies use optical fiber throughout their system as the backbone
architecture and as the long-distance connection between city phone systems.
Cable
television companies have also began integrating fiber-optics into their cable
systems. The trunk lines that connect central offices have generally been replaced
with optical fiber. Some providers have begun experimenting with fiber to the
curb using a fiber/coaxial hybrid. Such a hybrid allows for the integration of
fiber and coaxial at a neighborhood location. This location, called a node, would
provide the optical receiver that converts the light impulses back to electronic
signals. The signals could then be fed to individual homes via coaxial cable.
Local
Area Networks (LAN) is a collective group of computers, or computer systems, connected
to each other allowing for shared program software or data bases. Colleges, universities,
office buildings, and industrial plants, just to name a few, all make use of optical
fiber within their LAN systems.
Power
companies are an emerging group that have begun to utilize fiber-optics in their
communication systems. Most power utilities already have fiber-optic communication
systems in use for monitoring their power grid systems.
Single
Mode cable is a single stand of glass fiber with a diameter of 8.3 to 10 microns
that has one mode of transmission. Single Mode Fiber with a relatively narrow
diameter, through which only one mode will propagate typically 1310 or 1550nm.
Carries higher bandwidth than multimode fiber, but requires a light source with
a narrow spectral width. Synonyms mono-mode optical fiber, single-mode fiber,
single-mode optical waveguide, uni-mode fiber.
Single-mode
fiber gives you a higher transmission rate and up to 50 times more distance than
multimode, but it also costs more. Single-mode fiber has a much smaller core than
multimode. The small core and single light-wave virtually eliminate any distortion
that could result from overlapping light pulses, providing the least signal attenuation
and the highest transmission speeds of any fiber cable type.
Single-mode
optical fiber is an optical fiber in which only the lowest order bound mode can
propagate at the wavelength of interest typically 1300 to 1320nm.
Multimode
cable is made of of glass fibers, with a common diameters in the 50-to-100 micron
range for the light carry component (the most common size is 62.5). POF is a newer
plastic-based cable which promises performance similar to glass cable on very
short runs, but at a lower cost.
Multimode
fiber gives you high bandwidth at high speeds over medium distances. Light waves
are dispersed into numerous paths, or modes, as they travel through the cable's
core typically 850 or 1300nm. Typical multimode fiber core diameters are 50, 62.5,
and 100 micrometers. However, in long cable runs (greater than 3000 feet [914.4
ml), multiple paths of light can cause signal distortion at the receiving end,
resulting in an unclear and incomplete data transmission.