RS485 video cable - signal cable - fire protection dedicated cable

NegotiableUpdate on 01/08

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Nature of the Manufacturer: Producers

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Online Consult

Overview

RS485 video line signal line fire dedicated line $r $n telephone cable is a symmetrical communication cable used for telephone connections in smaller areas such as urban, suburban, and industrial and mining enterprises, often referred to as urban telephone cable. Its main characteristic is a large number of pairs (up to several thousand pairs, usually hundreds or tens of pairs). Due to low usage frequency and short communication distance, the wire diameter is thinner than long-distance communication cables, usually 0.5 millimeters. The wire structure of telephone cables includes three types: twisted pair, star twisted pair, and compound twisted pair. According to their core insulation and protective layer materials, they can be divided into paper insulated lead sheathed cables, polyethylene insulated composite protective layer cables

Product Details

RS485 video cable - signal cable - fire protection dedicated cable

throughA communication cable is a cable used to transmit telephone, telegraph, fax documents, television and radio programs, data, and other electrical signals. It is made up of twisted wires that are mutually insulated from each other. Compared with overhead open lines, communication cables have the advantages of large communication capacity, high transmission stability, good confidentiality, and less susceptibility to natural conditions and external interference.

Communication cable refers to a cable used for close range audio communication and long-distance high-frequency carrier and digital communication and signal transmission. It is one of the five major cable products in China. According to the purpose and scope of use of communication cables, it can be divided into six series of products, namely, urban communication cables (including paper insulated local telephone cables, polyolefin insulated polyolefin sheathed local telephone cables), long-distance symmetrical cables (including paper insulated high and low frequency long-distance symmetrical cables, copper core foam polyethylene high and low frequency long-distance symmetrical cables and digital transmission long-distance symmetrical cables)coaxial cable(including small coaxial cables, medium coaxial cables, and micro coaxial cables)submarine cable(Can be divided into symmetrical submarine and coaxial submarine cables)fiber optic cable(including traditional cable type, strip array type, and skeleton type)RF cable(including symmetrical RF and coaxial RF).

Communication cable production plants are distributed throughout the country. In addition to producing long-distance communication cables and local communication cables, China has also made significant progress in the production of fiber optic cables and polyolefin insulated comprehensive protective layer all plastic local communication cables. Many domestic manufacturers and research institutions have introduced technology and equipment from abroad to start production. China produces a small amount of fully plastic polyolefin insulation and sheath every yearTelephone cableSold to Hong Kong and MacauSoutheast AsiaandMiddle EastWaiting for the place.

Classification of cable types

If classified by cable type, communication cables are classified as follows:1. Single wire: refers to the most primitive communication cable, a single wire loop with the earth as the return line.2. Symmetric cable: A circuit composed of two identical wires under ideal conditions.

3. Coaxial cable: A circuit is formed by two conductors, one inside and one outside, on the same axis. The outer conductor surrounds the inner conductor, while the two are insulated.Application scenario classification

If classified by application scenarios, communication cables can be further divided into the following three categories:

1. Long distance cable: It has a long transmission distance and is generally reused. Most of them are buried directly underground, and in some cases, it is installed overhead or in pipelines.

2. Urban cable: The wires inside the cable are paired in pairs, and there are many pairs. Generally installed in pipelines, a small amount of urban cables are attached to buildings or installed overhead.

3. Local cable: mainly refers to communication cables used in telecommunications offices, usually installed on distribution frames, and some are also installed in cable trays; Local cables are used between transmission equipment and switching equipment within telecommunications offices, as well as within other internal equipment. In order to prevent fire within the telecommunications bureau, it is sometimes necessary to add flame-retardant sheaths to the cables used by the bureau.

According to the above classification method, communication cables can be symmetrical cables or coaxial cables.

Symmetric cable

A communication circuit is composed of two symmetrically arranged wires. Divided into high frequency and low frequency. The highest transmission frequency of the former can reach 800 kHz, corresponding to the ability to open 180 telephone channels in one loop; The highest transmission frequency of the latter is generally less than 252 kHz, which is equivalent to opening 60 telephone lines in one circuit. The electromagnetic field of symmetrical communication cables is in an open state (Figure 4), and the attenuation and loss of the circuit are large at high frequencies. The mutual interference between circuits and external interference are also large, making it difficult to increase the transmission frequency and capacity.

RS485 video cable - signal cable - fire protection dedicated cable

model	name	Purpose
MCPTJ-0.66/1.14	Metal shielded monitoring rubber sheathed flexible cable for coal mining machine	Power connection for coal mining machines and similar equipment with rated voltage of 0.66/1.14kV and below
MCPT-0.66/1.14	Metal shielded rubber sheathed flexible cable for coal mining machine	Power connection for coal mining machines and similar equipment with rated voltage of 0.66/1.14kV and below
MCPT-1.9/3.3	Metal shielded rubber sheathed flexible cable for coal mining machine	Power connection for coal mining machines and similar equipment with rated voltage of 1.9/3.3kV and below
MCPTJ-1.9/3.3	Metal shielded monitoring rubber sheathed flexible cable for coal mining machine	Power connection for coal mining machines and similar equipment with rated voltage of 1.9/3.3kV and below