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We Provide Terminations Installation and Commissioning of Fibre Optical Cables

Below are the Two Types of Common Fibre Cables , The Prefered is Singlemode for the Distance and High Transmission Speed Levels, Dark Fibre is the Common Term.

 Multimode 62.5/125 micron Duplex Fiber Optic Cable Assemblies
 Multimode 50/125 micron Duplex Fiber Assemblies
 Single-Mode 9/125 micron Duplex Fiber Patch cords and Jumpers
 Single-Mode Simplex Fiber Optic Cable Assemblies
 Fiber Optic Connectors
 Fiber Optic Adapters
 Bulk Fiber Optic Cable
 Fiber Optic Cables /Fiber Jumpers
 Duplex MTRJ-MTRJ Fiber Optic Cable
 Duplex MTRJ-SC Fiber Optic Cable
 Duplex MTRJ-ST Fiber Optic Cable
 Multimode Duplex SC-SC Fiber Optic Cable
 Multimode Duplex ST-SC Fiber Optic Cable
 Multimode Duplex ST-ST Fiber Optic Cable
 Multimode Duplex LC-ST Fiber Optic Cable
 Multimode Duplex LC-LC Fiber Optic Cable
 Multimode Duplex LC-MTRJ Fiber Optic Cable
 Multimode Duplex LC-SC Fiber Optic Cable
 Singlemode Duplex SC-SC Fiber Optic Cable
 Singlemode Duplex ST-SC Fiber Optic Cable
 Singlemode Duplex ST-ST Fiber Optic Cable Assemblies

Copper cable certification Some Tips

In copper twisted pair wire networks, copper cable certification is achieved through a thorough series of tests in accordance with Telecommunications Industry Association (TIA) or International Organization for Standardization (ISO) standards. These tests are done using a certification-testing tool, which provide “Pass” or “Fail” information. While certification can be performed by the owner of the network, certification is primarily done by datacom contractors. It is this certification that allows the contractors to warranty their work.

[ edit ] Need for certification

Datacom installers who need to prove to the network owner that the installation has been done correctly and meets TIA or ISO standards need to certify. Network owners who want to guarantee that the infrastructure is capable of handling a certain application (e.g Voice over Internet ) will use a tester to certify the network infrastructure. In some cases, these testers are used to pinpoint specific problems. Certification tests are vital if there is a discrepancy between the installer and network owner after an installation has been performed.

[ edit ] The Standards

The performance tests and their procedures have been defined in the ANSI/TIA/EIA-568-B.1 standard and the ISO/IEC 11801 standard. The TIA standard defines performance in categories ( Cat 3 , Cat 5e , Cat 6 ) and the ISO defines classes (Class C, D, E, and F). These standards define the procedure to certify that an installation meets performance criteria in a given category or class.

The significance of each category or class is the limit values of which the Pass/Fail and frequency ranges are measured; Cat 3 and Class C (no longer used) test and define communication with 16 MHz bandwidth , Cat 5e and Class D with 100 MHz bandwidth, Cat 6 and Class E up to 250 MHz, and Cat 7 and Class F with a frequency range through 600 MHz.

The standards also define that data from each test result must be collected and stored in either print or electronic format for future inspection.

[ edit ] The Tests

[ edit ] Wiremap

The Wiremap test is used to identify physical errors of the installation; proper pin termination at each end, shorts between any two or more wires, continuity to the remote end, split pairs, crossed pairs, reversed pairs, and any other mis-wiring.

See [TIA-568B] for wiring diagram.

[ edit ] Propagation Delay

The Propagation Delay test tests for the time it takes for the signal to be sent from one end and received by the other end.

[ edit ] Delay Skew

The Delay Skew test tests for the difference in propagation delay between the fastest and slowest set of wire pairs. An ideal skew is between 25 and 50 nanoseconds over a 100 meter cable. The lower this skew the better, less than 25 ns is excellent, but 45 to 50 ns is marginal.

[ edit ] Cable Length

The Cable Length test verifies that the cable from the transmitter to receiver does not exceed the maximum recommended distance of 100 meters in a 10/100/1000baseT[X] network.

[ edit ] Insertion Loss

Insertion loss , also referred to as attenuation , refers to the loss of signal strength at the far end of a line compared to the signal that was introduced into the line. This loss is due to the electrical resistance of the copper cable, the loss of energy through the cable insulation and the impedance caused by the connectors. Insertion loss is usually expressed in decibels dB with a minus sign. Insertion loss increases with distance and frequency. For every 3dB of loss, the original signal will be half the original amplitude.

[ edit ] Decibels vs. Voltage

[ edit ] Return Loss

Return Loss is the measurement (in dB) of the amount of signal that is reflected back toward the transmitter. The reflection of the signal is caused by the variations of impedance in the connectors and cable and is usually attributed to a poorly terminated wire. The greater the variation in impedance, the greater the return loss reading. If 3 pairs of wire pass by a substantial amount, but the 4 pair barely passes, it usually is an indication of a bad crimp or bad connection at the RJ45 plug. Return loss is usually not significant in the loss of a signal, but rather signal jitter.

[ edit ] Near-End Crosstalk (NEXT)

Near-End Crosstalk (NEXT) is an error condition that describes the occurrence of a signal from one wire pair radiating to and interfering with the signal of another wire pair. It is the difference in amplitude (in dB) between a transmitted signal and the crosstalk received on other cable pairs at the same end of the cabling. Higher NEXT values correspond to better cabling performance. A higher value is desirable as it would indicate that the power transmitted is greater in magnitude than the power induced onto another wire pair given that the NEXT measurement is simply a difference calculation. NEXT must be measured from each pair to each other pair in twisted pair cabling and from each end of the connection. NEXT is measured 30 meters (about 98 feet) from the injector / generator. Lower near end crosstalk values correspond to higher overall circuit performance. High NEXT values on a UTP LAN that will be using an older signaling standard ( IEEE 802.3i and earlier) are particularly detrimental.

[ edit ] Power Sum NEXT (PSNEXT)

Power Sum NEXT (PSNEXT) is the sum of NEXT values from 3 wire pairs as they affect the other wire pair. The combined effect of NEXT can be very detrimental to the signal.

[ edit ] The Equal-Level Far-End Crosstalk (ELFEXT)

The Equal-Level Far-End Crosstalk (ELFEXT) test measures Far-End Crosstalk (FEXT). FEXT is very similar to NEXT, but happens at the receiver side of the connection. Due to impedance on the line, crosstalk diminishes the signal as it gets further away from the transmitter. Because of this, FEXT is usually less detrimental to a signal than NEXT, but still important nonetheless.

[ edit ] Power Sum ELFEXT (PSELFEXT)

Power Sum ELFEXT (PSELFEXT) is the sum of FEXT values from 3 wire pairs as they affect the other wire pair.

[ edit ] Attenuation-to-Crosstalk ratio (ACR)

Attenuation-to-Crosstalk ratio (ACR) is the difference between the signal attenuation produced and NEXT and is measured in decibels (dB). The ACR indicates how much stronger the attenuated signal is than the crosstalk at the destination (receiving) end of a communications circuit. The ACR figure must be at least several decibels for proper performance. If the ACR is not large enough, errors will be frequent. In many cases, even a small improvement in ACR can cause a dramatic reduction in the bit error rate. Sometimes it may be necessary to switch from un-shielded twisted pair (UTP) cable to shielded twisted pair (STP) in order to increase the ACR.

[ edit ] Power Sum ACR (PSACR)

Power Sum ACR (PSACR) done in the same way as ACR, but using the PSNEXT value in the calculation rather than NEXT.

[ edit ] DC Loop Resistance

DC Loop Resistance measures the total resistance through one wire pair looped at one end of the connection. This will increase with the length of the cable. DC resistance usually has less effect on a signal than insertion loss, but plays a major role if you require power over Ethernet . Also measured in ohms is the characteristic impedance of the cable, which is independent of the cable length.

[ edit ] Notes:

• International standard ISO/IEC 11801: Information technology — Generic cabling for customer premises
• Telecommunications Industry Association (TIA) Commercial Building Telecommunications Cabling Standard - Part 1: General Requirements (ANSI/TIA/EIA-568-B.1-2001)
• Telecommunications Industry Association (TIA) Commercial Building Telecommunications Cabling Standard - Part 2: Balanced Twisted Pair Components - Addendum 1 - Transmission Performance Specifications for 4-Pair 100 Ohm Category 6 Cabling (ANSI/TIA/EIA-568-B.2-1-2002)

Fibre Optics Data Cabling Explained -

General Fibre Optic Cabling Terms & Definitions

Absorption: The amount of light lost in transmission through the optical
fibre over distance

Adaptor: Can be simplex or duplex, connecting two different optical fibre
connectors together

Attenuation: Measured as the amount of power lost in dB across a known
length of optical fibre

Attenuator: Reduces the amount of power in dB across between devices

Back Reflection: The amount of light reflected at the faces of two fibre
optic connectors in -dB

Bandwidth: The operating frequency achievable across a fibre optic link in
nM

Fibre Connector: The junction device between two optical fibre and/or device

Coupler: Can be simplex or duplex, connecting two similar types of connector

Crossed Cable: Provides ODD Polarity of the optical fibre link

Duplex Cable: Two separate optical fibres joined along the length with the
outer jacket material

Duplex Fibre Connector: Two fibre connectors joined together

Fusion Splice: The method of permanently connecting (glass fusion) two
separate optical fibres

Gelly Filled Cables: Silicon Gelly Filled fibre, used to prevent moisture
penetration

GBIC: Gigabit Interface Converter

Insertion Loss: The attenuation caused by the insertion of a device or cable


Loose Tube Cable: A hollow sleeve containing multiple single optical fibres

Loss Budget: The amount of power that can be lost in dB before connectivity
is lost

Low Smoke Zero Halogen: European Standard for Smoke Emission of Optical
Fibre

Jack: The female receptacle - usually found on equipment.

Mandrel: A fibre wrapping device used to cause attenuation within a fibre
cable.

Mechanical Splice: A mechanical means of connecting two fibres.

Multimode Fibre: A type of fibre optic cable where the core diameter is much
larger than the wavelength of light transmitted. Two common multimode fibre
types are 50/125 and 62.5/125.

Plenum Cable: American Standard for Smoke Emission of Optical fibre

Premise Distribution Riser: Indoor multiple 4 or more core tight buffered
optical fibre

Return Loss: Launched Power lost across the length of cable and returned.
Measured in +dB

Scattering: Internal glass characteristic such as glass molecules can cause
light dispersal

Simplex Cable: A single core fibre optic cable in multimode or single mode

Straight cable: Provides EVEN Polarity of the optical fibre link

Trunk cable: Cable constructed with more than four optical fibres

Tight Buffered Cable: Kevlar is used to protect the fibre and provide end to
end tensile strength

Single mode Fibre: A type of fibre with a small core that allows only one mode of
light to propagate.

Splice: The mechanical or welded together fusion of two optical fibres

Termination: The means to place an optical connector onto a fibre

Dispersion: Separation of a wavelength into spectral components with
different wave lengths.

Wavelength: The wavelength is the distance between repeating units of a wave
pattern in nM

Differential Mode Delay: When the multiple modes of light become
unsynchronised causing dispersion of the light due to molecular
interference, thus segregating the signal..

Dark Fibre: Fibre which has been laid but has not active optical fibre
device attached

Wavelength-division multiplexing (WDM): Multiplexes multiple carrier optical
signals across a single optical fibre link using different wavelengths and
colour spectrum light to carry multiple signals

Zip Cord: Another name for duplex fibre, can be separated to form two
simplex cables

For Fibre Optical Quotes email sales@victorharbordatacabling.com.au

Call for onsite Quotes inspections and Advise

08 83339020

December 7, 2008 3:25 AM