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Experts briefly introduce the purchase method of telephone line
1. The conductor adopts imported high-purity oxygen-free copper telephone line, with low transmission attenuation, low signal loss, clear sound quality and no noise, and no sense of distance. 2. The sheath adopts high-grade transparent outer material telephone line, which is resistant to acid and alkali corrosion, anti-aging and has long service life. The telephone line with transparent material has good mechanical and physical properties, electrical properties and thermal stability, and the content of heavy metals and heavy metal compounds such as lead and cadmium is extremely low. 3. The telephone line made of 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 video phone.
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Classification and Standard Test of Combustion Characteristics of Wires and Cables
Wire and cable according to its own combustion characteristics, can be divided into ordinary wire and cable, flame retardant wire and cable, fire-resistant wire and cable, halogen-free low smoke wire and cable and mineral insulated cable. (1) Flame-retardant wire and cable refers to a wire and cable that is difficult to catch fire and has the ability to prevent or delay the spread of flame. The commonly used standard test is GB/T18380.3 (equivalent to IEC60332-1999); (2) Fire-resistant wire and cable refers to the wire and cable that can maintain the integrity of the line under the flame combustion of the specified temperature and time. Commonly used standard test for GB/T12666.6 (equivalent to IEC60331-21-1999):
Radio and Television New Media Coaxial Cable Connected to the Internet under the Internet of Things
As more and more data is uploaded or downloaded, the Internet becomes more and more important as a medium for data to the cloud. People's demand for network and network speed is becoming more and more intense. However, the convenience of accessing the Internet can not develop rapidly with cloud computing. For some areas where network cables are not laid or old network cables need to be upgraded, large-scale laying or updating of cables will cost a lot of manpower and material resources. So, can you use the existing equipment to achieve network access? This problem is also a direction that the radio and television Internet of Things industry has been studying. In the forum of 2014 China International Internet of things Expo held last week, Zhang Xuebin of Hubei herdsman Network Technology Co., Ltd. discussed how to realize home broadband access by using existing cable TV coaxial cable in a speech on the theme of "radio and television broadband-FTTx access and home Internet of things.
Wire and cable fault test method
Wire and cable manufacturers will encounter the phenomenon of wire disconnection or short circuit, which is a headache for the quality inspection department of the enterprise. Some enterprises have wire and cable fault detection instrument, some do not use the existing equipment to find the fault point needs a simple and applicable calculation method, here introduced this wire and cable fault calculation method, although in the previous cable newspaper saw here also put forward our idea of finding breakpoints and short circuits.
