In the construction of generic cabling project, twisted pair cable is the part that accounts for a large part of the project cost, and it is also the key to the entire cabling project. However, from a technical point of view, for each cable or link channel, the twisted pair is required to be long enough from end to end (from the distribution frame to the module), and there is no open circuit in the middle.

In order to save costs, the construction party may try not to waste lines and try to save costs during the construction process. In this way, some information points may not be long enough, and some information points may be too long. This does not meet the technical requirements that end-to-end is long enough and there is no open circuit in the middle. At the same time, it does not achieve the win-win goal of saving cables.

In a link channel of generic cabling, it refers to the management distribution frame from the sub distribution room to the working end module in the work area.

I have a customer who often complains to me that some of his networks are not connected at all times, and packets are often switched. After checking, it is ruled out that the problem is not a switch problem. Then it is doubted whether the jumper and termination of the management area and the work area are not secure, which is not true after troubleshooting. Later, when I opened the cable tray behind the cabinet in his management area, I found that nearly 20 cables in the 200 * 100 metal tray installed vertically against the wall were extended to the management cabinet through a "straight through" connection without any identification and then terminated on the distribution frame. This is where the problem arises. Obviously, this part of the cable was shortened during the construction process and extended through the "straight through" of the three no products. However, because the two ends of the line are made of crystal heads, and the line itself has a certain weight, the contact between the straight through and the crystal head is not enough, and even may fall off completely, causing the entire link to be blocked. Generally, the cables enclosed in the cable tray will not be considered, because sometimes this situation can be passed during the test or handled during the test acceptance. Generally, Party A will not think of any situation in the hidden place.

When the wires are short, we have seen them connected by hand, with wires, modules, etc., but no matter what connection method, it will lay hidden dangers for future use.

What is the reason for this problem?

1. The management personnel of the construction company stressed to the construction setting out personnel that the cables should be saved. Under the guidance of this principle, if the setting out construction personnel are not experienced enough, the cables are often short, sometimes just a little short. However, when the inexperienced construction personnel do not require them to save the use of cables, they may put 20 to 50 meters more lines at both ends of a link channel management area and work area, However, this extra thread is totally wasted, and it really hurts to see it.

2. The reason for this is that the construction was not standardized and did not follow the process.

The general construction process is to connect the whole link channel from the management area to the work area, and the setting out should be started after the determination.

That is, the location of the management cabinet of the termination patch panel in the management area is determined, the size of the cabinet is determined, and the installation position of the patch panel is determined.

The direction and installation position of the cables in the horizontal area shall be determined (i.e., the horizontal cable tray or the exposed trunking in the ceiling).

Determine the location of the through wall hole entering the work area.

The location of wall pipes in the work area shall be determined.

The point location of the work area is determined (that is, the location of the termination module).

That is to say, the setting out should not be started until the entire channel from the distribution frame to the module is determined.

However, in the process of construction, because the management room is a large room, the placement of equipment in it cannot be determined, the horizontal part cannot be determined at the bend, and the specific location of the point cannot be determined in the working area room due to the problems of Party A, the setting out starts after some factors are not determined, which leads to the cable shortening not meeting the requirements, Or the cable is lengthened and wasted.

Therefore, we should pay attention to the following points according to our experience to avoid waste caused by cable shortening or a large number of cable lengthening:

1. Site construction management personnel shall conduct technical disclosure and drawing disclosure before construction.

Before construction, the construction supervisor shall clearly explain the technical requirements for setting out, site conditions and construction personnel, as well as the pipeline drawings and routing drawings, and explain them to the workers.

2. The construction personnel should try to use people with certain construction experience, not road workers or strangers who have never done before.

3. The construction process shall be strictly required, that is, the whole pipeline from the starting point to the end of the setting out shall be connected and the location shall be confirmed before setting out.

4. The on-site supervisors shall timely coordinate with Party A and specific construction personnel. Solve the problems in a timely manner, so that each link can be implemented after confirmation.

5. Check and correct at any time.

After the experiments of several projects, unless Party A modifies the scheme afterwards during the construction process, it is rare for us to waste the cable due to short or long laying during the paying off process