Six type line construction and installation: When to choose six types of wiring

With the development of network technology, gigabit to the desktop has become a fact, six of the wiring has been more and more users of widespread concern. However, in the current market, people have a lot of different understanding of the installation of six kinds of wiring.

Many manufacturers to gain market share, wishful thinking ground to all projects to promote six types of wiring, but not fully consider for the end user to provide a reasonable reason why to choose six types of wiring, rather than other media types. At the same time, due to the lack of information in the industry and the conflicting information between manufacturers, users are often confused when choosing six kinds of wiring, unable to make correct judgments and choices.

So, what is the real driving factor for category six cabling? Under what circumstances does the user need to choose six kinds of wiring? Molex that the network transformation is the main driving factor of six kinds of wiring. When users choose cabling Scheme, they must combine their own network reality, choose to support their current and future applications, while the most cost-effective cabling solutions.

As we all know, wiring is a net element of the whole network, and the whole network also includes switches, PCs, peripherals, servers and software. These elements are combined to form a complete network, which must be taken into account when selecting cabling types and media types for cabling facilities. IDG's 1999 report says 83% of the Internet connections in the United States are in Ethernet mode. Now this percentage may have increased to more than 90% per cent. In other words, Ethernet has become the de facto world standard in the LAN. With the development of network technology, we also clearly see the gigabit desktop, million trillion backbone of the inevitable trend.

Most of the current communication media can handle the network transformation of Gigabit Protocol. So when the customer network turns to gigabit Ethernet, there is no doubt that the most cost-effective solution is the customer's best choice.

For large organizations, some of its employees may be "High application demand users". In the short and medium term, this will inevitably require a switch to Gigabit Ethernet to the desktop. The end user must therefore include Gigabit Ethernet in the plan when considering future expenses. 1000 BASE-TX has not been listed yet, but will be listed before and after next year. If users of high application requirements in the company switch to Gigabit Ethernet within this time frame, the deployment cost of using 1000 base-tx on the six-class cabling is lower. ---http://bianceng.cn (computer science)

If Gigabit Ethernet is included in the network transition strategy, users will benefit from the immediate installation of the six-class cabling. Although many users currently deploy only 10/100mbps Ethernet, the lower-cost 1000 BASE-TX format will facilitate the deployment of Gigabit Ethernet in the future. If a company leases a building for a long period of 5 + 5 + 5 years, or uses its own building, the company is likely to eventually turn to Gigabit Ethernet. Installing six-class cabling now will also help to deploy gigabit Ethernet at a lower total cost using 1000 base-tx.

To be sure, the cost of 1000 base-t active devices will continue to decline over time, and the cost of NICs and switches will be half the current cost when the company shifts to Gigabit Ethernet. This view is correct and indicates when the company will turn to Gigabit Ethernet. This may indicate that the cost advantage of 1000 base-tx over six-class cabling will no longer apply.

In short, if you include Gigabit Ethernet in a transition plan at some stage of your cabling system usage, the deployment cost of a six-class cabling is lower than the five-class cabling. If the company's plan does not have gigabit Ethernet, then six-class cabling will only waste money. In this respect, we can verify through the cost model, by comparing 1000 base-t and 1000 base-tx. End users can get the same data throughput at a lower overall cost, which is the real advantage.

For the installation of class six cabling, no new installation method is listed in detail in the six categories of AN/NZS 3080, TIA or ISO. A few years ago for the five-class wiring requirements of the installation method is also applicable to six types of wiring. The difference is that because the six classes have very stringent performance standards, they require higher installation quality. Any installation errors or shortcuts in class six wiring may result in a test that is barely qualified/unqualified. Molex Enterprise Cabling Network The Department strongly recommends that the installation methods stipulated in the wiring standard documents and our recommended practices with the products be strictly adhered to. Molex Enterprise Cabling Network Department for many years has stipulated that the certification installer must adopt the high quality installation method, because the product and the installment will have the same influence to the wiring system overall quality.

Some of the important issues to consider during the installation process include:

(a) Cable tensile force

Do not exceed cable pulling force as stipulated by cable manufacturer. Tension over the assembly so that the wire in the cable to the offset deformation, seriously affect the cable suppression noise (NEXT, fext and derivatives) of the ability, and seriously affect the cable's structural return loss, which will change the impedance of the cable, damage the overall return loss performance. These factors are important factors in the transmission of high-speed LAN system, such as Gigabit Ethernet. In addition, this may cause the line to disperse and may damage the wire.

(b) Cable bending radius

Avoid excessive bending of the cable, as this will change the stranded distance of the cable alignment. If the bending is excessive, the line pair may diffuse, resulting in impedance mismatch and unacceptable return loss performance. In addition, this may change the relationship between the 4 wires inside the cable to the stranded distance, leading to the noise suppression problem. Cable manufacturers recommend that the bending radius of the cable should not be less than 8 times times the diameter of the cable installed. For a typical type six cable, the bending radius should be greater than 50 mm. One of the most critical areas of the problem is wiring cabinets, which, because of the large number of cables introduced into the wiring racks, may cause some cables to be too tight and too curved to keep them clean.

(c) Cable compression

Avoid compressing cables with cable ties that are too tight. Cable too tight will make the cable inside the twisted wire deformation, affect its performance, will generally make the return loss more obviously in the unqualified state. The effect of the return loss is accumulated, each too tight cable tie line will increase the total loss. A better approach is to ensure that no cable sheath deformation occurs when cable ties are used to tie the cables together. This is also important in wiring cabinets, as users usually tighten cable ties to keep the cables neat, or in the wiring cabinets, the end of the wiring racks on the back of the line is very difficult. We recommend the use of hooks and ring cable ties, such as the Velcro brand's tie-line belt.

(d) Cable weight

Note that the Molex Enterprise Cabling Network 23rd (or 0.6 mm diameter) Six cable weighs about twice times the weight of five types of cables. The weight of the 24-meter-long six-type cable is nearly 1.0 kg, while the same number of five-or five-type cables weighs only 0.6 kg. The cable weight must be taken into account when using the hanging line support cable. It is recommended that each hanging line support point should support up to 24 cables per bundle.

(e) Cable knotting

When pulling the cable out of the reel, be aware that the cable may sometimes get knotted. If the cable is knotted, it should be treated as a cable damage and the cable should be replaced. Mounting pressure causes the installer to straighten the cable knot. However, the damage has occurred and will be found during cable testing.

(f) Number of cables in bundled cables

When any number of cables are bundled with long parallel lengths, the wires of different cables in a bundle cable with the same stranded distance are coupled to the capacitance (for example, the blue line to the Blue Line pair), causing crosstalk to increase significantly. This is called "Foreign crosstalk", which is still subject to the specification or precise definition of wiring standards. The best way to eliminate the adverse effects of extraneous crosstalk is to minimize the length of long parallel cables and to install bundles of cables in a pseudo random manner.

(g) Cable sheath peel off

On the cable end contact, the line pairs exposed from the skin to the IDC must be kept to a minimum at the end of the connection. There is no absolute need to peel off the cable sheath, it can only be comfortable to the wire to the IDC. A TIA or ISO wiring standard sets the length of the sheath to be peeled off. By minimizing the length of the sheath to be peeled, this ensures that the line pairs of cables inside the cable are maintained to achieve the most efficient transmission path. The fext of the sheath on IDC damages the next and the performance of the six-class cabling system.

(h) Line to diffuse

On-line cable end contact, should make each line in the cable to the offset as close as possible to IDC. The wire pair is calculated by the cable manufacturer, and changing the cable stranding will adversely affect the cable performance. Although ISO and TIA Super Five cabling standards specify the length of line pairs to disperse (13 mm), they do not make such a provision for six types of wiring. The current proposal is to comply with the manufacturer's recommendations. At the end point where the sequence of contact and loop wires is wrong, it is better to add a pair of stranded wires than to remove a pair of stranded wires to ensure alignment with the relevant IDC.

(i) Ambient temperature

The TIA and ISO standards Conference raised the status of this environmental problem. Of course, in the past it has caused problems in the five categories and super five categories, the industry believes that in the category six cabling, this is a much more important issue. The temperature of the environment in which the cable is installed does affect the transmission characteristics of the cable. If possible, avoid high temperature conditions, such as >60, that may be encountered. C. This can easily happen if the ceiling roof is exposed to direct sunlight. Generally speaking, when the temperature increases, the attenuation of the cable will increase.

As you can see, the current focus on the six types of wiring system behind, and not just bandwidth requirements or good lobbying manufacturers. The real need to install type six cabling is the business needs of the corporate network transition. During the installation process, although the installation method for five types of wiring is also applicable to six types of wiring, but because the six class has very strict performance standards, so its installation quality requirements are higher.