Telephone line selection method

Understand the material of the telephone line and master the method of purchasing the telephone line to ensure the quality of the call. The following describes the material and purchase method of the telephone line in detail for your reference.

First, what is the quality of the telephone line material?

1. Copper clad steel: This kind of wire is relatively hard, not suitable for external wire drawing, and it is easy to break the core. But buried in the wall will still be available. And can only be used for close-range use, (such as the corridor junction box to the user) oxygen-free copper 2-core telephone line oxygen-free copper 2-core telephone line.

2, copper clad aluminum: This line is relatively soft, it is easier to break the core. You can bury it in the wall or you can pull it outside the wall. It can only be used for close range use (eg corridor junction box to user).

3, all copper: This line is soft, you can bury it in the wall, you can also pull the line outside the wall. Can be used for long distance transmission. Among them, only the telephone line that uses copper is used to meet the national standard.

Second, the telephone line selection method

1, the list of brands is trustworthy, product quality is guaranteed. The conductor adopts a telephone line with imported high-purity oxygen-free copper, which has small transmission attenuation, small signal loss, clear sound quality and no noise, and no sense of distance in the call.

2. The sheath is made of high-grade transparent externally-covered telephone line, which is resistant to acid and alkali corrosion, anti-aging and long service life. The sheath is made of a transparent material telephone line with good mechanical and physical properties, electrical properties and thermal stability. The content of heavy metals and heavy metal compounds such as lead and cadmium is extremely low.

3. The telephone line with imported polypropylene material has high purity, lower transmission attenuation and higher transmission speed. It is suitable for broadband Internet access and can meet the requirements of high transmission speed of videophone.

4. The copper core of the qualified copper core telephone line should be purple, shiny and soft to the touch. The fake copper core copper core is purple, yellow or white.

5, high-quality crystal head looks bright and transparent, a bit like crystal feeling, the outside is very smooth, the material of each part will not contain any impurities, high transparency. Secondly, the plastic mouth part of the crystal head is relatively strong, and the hollow part of the crystal head is pressed by hand. If there is obvious deformation, then the quality is problematic. In addition, the quality of the top copper sheet directly affects the quality of the crystal head. When inspecting the copper sheet, first check if the cut edge of the metal terminal portion is neat. The color of the good crystal head copper piece should be golden yellow, and the inferior product will be darkened and darkened after oxidation due to the different materials used.