Category: Info

Why you need to get Structured Cabling Contractor?

The market now are very competitive even in this structured cabling market, I believe every one can pull and install the cable but are they install in the correct manner?

Electrical contractors that do install structured cabling without a solid knowledge of the process may be putting both the home’s network and their own professional reputation at risk. However, refusing to take part in the structured cabling market may not be the best move for an electrical contractor either.

There are some important differences between pulling electrical wires and pulling structured cabling that electrical contractors need to be aware of to provide quality work and earn a good reputation in this growing field. One of the biggest differences between electrical wiring and structured cabling is the fragility of the latter. “In the installation of structured cabling, you can easily destroy the performance of the cables if they’re not handled right.”

For example, the maximum pulling tension for low-voltage cable is much less than that used for electrical cables. Each manufacturer has its own standard, but less than 25 pounds is typically recommended. What will happen if more force is used? “One improper tug at a wire, and you can pull out the twist that is so carefully put in by the manufacturer, degrading performance.

It is also important to note that the low-voltage cable, such as fiber optic cable, cannot bend at a 90 angle, so it must form a loop in order to turn in a different direction. The radius of this loop also depends on manufacturer specifications. If there is too sharp of a bend in the cabling, some of the cable fibers could break or kink and also degrade the signal.

You must install low-voltage cables at least 12 inches away from electrical wires, and run them parallel to one another. They must not be closer than this for more than 6 feet. If electrical wires and low-voltage cables cross, they must do so at a 90° angle.

Keeping up with the competition

Though many builders seem willing to give their structured cabling work to electrical contractors, some are still not sure they will perform at the level of electronic systems contractors, alarm system installers, and even home entertainment installers — all specifically trained in low-voltage installations.

“I think the electrical contractors have a ways to go to prove that they know what they’re doing in this area [structured cabling]”, “Their background and experience is on the electrical side, which is totally different than on the communications side.”

Data Center Physical Infrastructure (Enterprise Networks)

Data Center Infrastructure Structured Cabling

Data Center Infrastructure Structured Cabling – Facilities

When designing a data center, several factors should be taken into consideration, including standards compliance.  When implementing a structured cabling solution, the standard recommends a star topology architecture to achieve maximum network flexibility.  TIA-942 outlines additional factors crucial to data center design, including recognized media, cable types, recommended distances, pathway and space considerations and redundancy. In addition to standards compliance, the need for infrastructure flexibility to accommodate future moves, adds and changes due to growth, new applications, data rates and technology advancements in system equipment must be considered.

Data Center Needs

As data centers face the continued need to expand and grow, the fundamental concerns are constant. Data center infrastructures must provide reliability, flexibility and scalability in order to meet the ever-changing data center network.

Reliability: Data center cabling infrastructures must provide security and enable 24 x 365 x 7 uptime. Tier 4 data centers have uptime requirements of 99.995 percent, less than one-half hour per year.

Flexibility: With the constant in data centers being change, the cabling infrastructure must be modular to accommodate changing requirements and easy to manage and adjust for minimal downtime during moves, adds and changes.

Scalability: Cabling infrastructures must support data center growth, both in addition of system electronics and increasing data rates to accommodate the need for more bandwidth. The infrastructure must be able to support existing serial duplex transmission and provide a clear migration path to future parallel optic transmission. In general, the infrastructure should be designed to meet the challenges of the data center over a 15- to 20-year service life.

TIA-942 includes four tiers relating to various levels of redundancy (Annex G)

Tier I – No Redundancy – 99.671% available

Tier II – Redundant component, but 1 path – 99.741% available

Tier III – Multiple paths, components, but 1 active path – 99.982% available

Tier IV – Multiple paths, components, all active – 99.995% available – < 1/2 hour downtime/year

Low Smoke Zero Halogen Cable (LSZH)

What are Halogens?
When grouped together, the elements fluorine, chlorine, bromine, iodine and astatine make up a chemical family known as the Halogens. You may not have been aware of it, but halogens have many uses, and most of us come into contact with them on a daily basis. Just think about it: the fluoride in your toothpaste, the chlorine in your pool, the iodine in your medicine cabinet…they’re all halogens!

 

Halogens as Flame Retardants
Pool maintenance, first aid and dental hygiene aside, halogens are also widely used as flame retardants in a variety of plastics, including the PVC (polyvinyl chloride) that makes up many cable jackets and electronics-related products. Unfortunately, when it comes to the health of both humans and the environment, halogen-based flame retardants can be a double-edged sword.
Ironically, while these halogen compounds keep plastics from catching fire and spreading flames, they can also release hazardous gases if the plastic actually ignites. Carcinogenic substances like Polychlorinated Biphenyls (PCBs), Polycyclic Aromatic Hydrocarbons (PAHs), Nitro Polycyclic Aromatic Hydrocarbons and dioxins are all by-products produced when halogenated plastics burn. These gaseous compounds pose a double threat…not only are they dangerous in vapor form, but they can also condense into caustic acids (such as hydrochloric acid) when they come into contact with water.

 

Low Smoke Zero Halogen Materials: a Safer Alternative
It’s all in the name… “Low Smoke Zero Halogen” sums everything up: these materials (such as polypropylene) contain absolutely no halogens, but still have excellent flame resistance and produce very little smoke when burned.
LSZH cabling is the safest choice for plenum use and any other applications in which smoke is likely to both build up and come into contact with people, since no harmful toxins are actually released.

LSZH Structured Cabling

The Hidden Hero Structured Cabling System

Cabling is one of the most important elements within any IT network and is one of the biggest IT investments that companies make. Selecting the right cabling system can have a tangible impact on a range of issues, including network performance, the speed at which data can pass through the network. Therefore, making the right choice of cabling system is too important an issue to be ignored.

Understandably, since cabling is an occasional rather than a regular purchase, most IT managers cannot be expected to be experts in this area, but this does mean that they often need to rely on advice from contractors, consultants, installers and suppliers. This can be dangerous, depending on the quality of the information being distributed. Poor-quality or inadequate cabling systems can bring a network to a standstill.

There have even been occasions where it has been necessary to rip out large sections of structured cabling, due to faults that need to be located and repaired, costing the companies involved vast amounts of money, as well as lost time. These faults may not be immediately obvious, potentially causing the user company considerable disruption at a later date.

The good news is that with a basic understanding of the cabling market and installation issues, IT managers can make more informed choices. The first question is: structured or not? Direct cabling is cheaper, but it is essentially a blind network, without any means to manage or configure it easily. This is particularly important when changes need to be made, for instance switching around connections to end-users, should there be a reorganisation in an office.

When correctly labelled, the patch panel of a structured cabling system makes it easy to see at a glance every connection, so changes can be quickly and easily made, usually without requiring a specialist visit from a third party. Moreover, efficient installation means that any potential EMI or crosstalk options can be minimised, for instance by ensuring specified distances between cables, minimising bend radius and using techniques, such as dual-pathing with diverse routing of cables. Given how often most companies will need to make changes to their cabling systems, however small, structured cabling is these days the sensible option.