818 irregularities in Integrated Wiring construction (photos)

The Integrated Wiring System is the most important component of the entire computer communication system. Wiring is like Human nerves, which are crossly And crossly staggered, but there are rules to follow. As the saying goes, there is no rule, and it cannot be a square. Integrated Wiring should also follow relevant standards during construction. Of course, many engineers can perform cabling only after obtaining relevant qualifications. Some engineers ignore the standard regulations in the construction details. Here, the IDC cabling engineer says it is not easy to discover and common during construction.

1. nonstandard Construction: excessive bending radius of the cable

Take a closer look at this construction drawing. Is the first impression neat and beautiful!

Figure column: irregular bending radius of cables

Due to the limited space of the cable Trough during cabling, such bending radius may easily occur, but it is related to the following countries: in GB50311/GB50312 and EIA/TIA 568B ISO/IEC standards, the bending degree of twisted pair wires is strictly required. The bending radius of the cable cannot exceed 8 times of the wire diameter of the cable. Obviously, the construction in the figure is nonstandard. The consequence of this is that the performance of the cable is reduced. Over-bending over a long period of time will damage the electrical performance of the cable. Although the appearance of the Outer Sheath Layer of the Protection cable cannot be reflected in a short period of time, the life of the outer sheath is greatly shortened due to objective phenomena such as climate and temperature, the cable service life is also affected.

2. Non-standard construction II: laying strong and weak current cables together.

Legend: Nonstandard Cable Laying

As shown in, I have seen it in many data centers or cabling scenarios. Do such cabling comply with relevant standards? I believe many experienced cabling engineers will ask questions. In the national standard GB/T50311-2000 standard, there is a detailed description of the provisions.

Communication cables are different from power cables. When the power cables generate electromagnetic waves, communication performance of the communication cables will be affected, resulting in data confusion. Therefore, communication fails.

3. Non-standard construction 3: leave too many redundant cables under the Cabinet

In the Cabling Management Room, the cabinets after the cables are laid are neat and tidy, and the cables are horizontal and vertical. However, when the floors under the cabinets are opened, we can see that there are too many cables that are not cut off, and they are all reserved below,

 

Legend: too many cables are redundant for backup

Too many redundant cables are stacked together, which not only affects the appearance of wiring, but also affects the temperature, and the communication performance of cables will also be greatly reduced. The most effective way to avoid this construction phenomenon is:

① At the early stage of the IDC design, the Cabinet location should be determined at the site for survey to ensure that the cabinets will not be changed during future use. Make plans.

② During construction, do not leave too long cables in Cable Laying to meet actual needs.

③ When the device is installed, the redundant cables are cut off, so there is no need to reserve too long redundancy.

4. nonstandard construction 4: bundled cables are tightly bundled together 

Standardized and tidy Cable Laying increases the appearance of the entire data center and horizontal area, and makes the entire system look beautiful. However, the communication cable core is generally relatively small. If the cables are tightly bundled when multiple cables are laid together, crosstalk is easy to produce, which is not worth the candle for the cable itself. In addition, it is easy to crack the outer jacket of the cable when the cables are too tight for a long time.

 

Legend: tight cabling

For cabling, details are often ignored. However, the wiring system is a precise Weak Current System, and the details often determine the key of the cable performance. Therefore, the above phenomenon should be avoided during cabling. It provides a good environment for computer communication systems. We borrowed a sentence from the book: Details determine success or failure! In the Integrated Wiring System, there is no such thing at all.