[Telephone Line]How to distinguish the model and specification of the telephone line
The telephone line is the incoming line of the telephone. Telephone. Divided into 2 cores and 4 cores. Conductor materials are divided into three types: copper-clad steel, copper-clad aluminum and all-copper. All-copper conductors have the best effect.
Telephone line description
1. Product implementation standard: refer to the YD/T630-93 standard of the Post and Telecommunications Bureau and the enterprise standard of Endeavour
2. Insulation material: high-density polyethylene or polypropylene, and the color of the insulating wire is marked according to the national standard chromatogram
3. Pairing of insulation: twist a single insulation into pairs according to different pitches, and use Specified chromatographic combination to identify wire pairs; reduces mutual interference and crosstalk between leads and low power consumption
Telephone line applications
Communication engineering wiring , the connection between the wiring of the indoor telephone communication cable system, the main line between the voice communication system, the program-controlled exchange, the telephone, the fax and the digital telephone
Telephone wire specification
Common specifications are two-core and four-core, with wire diameters of 0.4 and 0.5, respectively, and 0.8 and 1.0 in some areas
Telephone wire material
Common materials (conductors) are:
1, copper clad steel
This wire is relatively hard and is not suitable for The external wire is pulled, and the core is easy to break. But it can still be used when buried in the wall. And can only be used for close-range use, (such as corridor junction box to user)
2, copper clad aluminum
This kind of wire is relatively soft, and it is easier to break the core. It can be buried in the wall, or it can be pulled outside the wall. And can only be used for short distance use, (such as corridor junction box to user)
3, all copper
this The wire is soft and can be buried in the wall or pulled outside the wall. Can be used for long-distance transmission.
Among them, the only ones that meet the national standard are all-copper telephone lines.
Telephone Line Model Explanation
HYV2x1/0.4 CCS
HYV4x1/0.4 CCS
HYV2x1/0.4 BC
HYV2x1/0.5 BC
HYV4x1/0.4 BC
HYV4x1/0.5 BC
HSYV 2x2x0.5 BC
Remarks: CCS is copper clad steel, BC is full copper.
HYV2x1/0.4 CCS, among which HYV is the English model of the telephone line, 2 represents 2 cores, and 1/0.4 CCS represents a single copper-clad steel conductor with a diameter of 0.4mm.
And so on, HYV4x1/0.4 BC, among which HYV model, 4 represents 4 cores, 1/0.5 BC represents a single pure copper conductor with a diameter of 0.5 mm.
In particular, HSYV 2x2x0.5, “S” stands for twisted pair, 2×2 stands for 2 pairs (4 cores) twisted pair, 0.5 stands for a single conductor with a diameter of 0.5 mm.
Compared with ordinary parallel telephone lines, twisted pair telephone lines are mainly used for the improvement of transmission speed and lower power loss.
Distinguish between good and bad phone lines
1. The brands on the list are trustworthy and the product quality is guaranteed.
2. The conductor adopts imported high-purity oxygen-free copper telephone line, which has small transmission attenuation, small signal loss, clear sound quality and no noise, and no sense of distance when talking.
3. The sheath is made of high-grade transparent outer quilt telephone line, which is resistant to acid and alkali corrosion, anti-aging, and has a long service life.
4. The sheath is made of transparent material telephone line, which has good mechanical and physical properties, electrical properties and thermal stability, and the content of heavy metals such as lead and cadmium and heavy metal compounds is extremely low.
5. The telephone line using imported polypropylene material has high purity, lower transmission attenuation and higher transmission speed. It is suitable for broadband Internet access and can meet the high transmission speed requirements of videophone.
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