Communication leakage coaxial cable spreader how many meters to install one

But the broadband lines we use now are generally Category 5e cables; Super Category 5"Refers to the Category 5e unshielded twisted pair (UTP).

An unshielded twisted pair cable is made up of multiple pairs of twisted pairs and a plastic sheath that attenuates the crosstalk ratio. Because the two are almost the same, such as proximal crosstalk, which is the current mainstream product; The identification of the Category 6 line is "cat6", with a bandwidth of 250m, which is used to set up a gigabit network, which is the trend of future development, but the performance has been significantly improved, so they all use Category 5 cables.

The identification of the Category 5 line is "cat5", with a bandwidth of 100m, which is suitable for networks below 100 megabits; The Category 5e line is marked as "Cat5E", with a bandwidth of 155M, and the return loss has been improved, but its transmission bandwidth is still 100MHz.

Category 5 refers to the five different quality levels defined by the International Electrical Industry Association for twisted pair cables.

Category 5 unshielded twisted pair is a cable that appears after improving part of the performance of the existing Category 5 shielded twisted pair, and many performance parameters are not Category 5 coaxial cables.

Category 5 cable, is 4 strands and 8 cores, just like the broadband cable we commonly use.

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The leakage cable is a kind of coaxial cable with a special structure, and the leakage cable periodically opens a slot hole with a certain shape along the length direction on its outer conductor, so it is also called a slotted cable. In the field of communication, it is mainly used for coverage over longer distances and is used to replace antennas.

The housing of the coaxial cable is shielded and used to transmit the signal.

The purpose of the slotting of the outer conductor is to radiate the electrical signal energy from the cable notch to achieve the purpose of propagating and receiving foreign radio waves.

According to the standard TB T3201-2008 railway communication leakage coaxial cable, the radius of the curved mu is not less than 20 times of the fastest and tallest outer diameter.

Leaky coaxial cable is the abbreviation of leaky coaxial cable, usually referred to as leaky cable or leaky cable, its structure is basically the same as that of ordinary coaxial cable, composed of three parts: inner conductor, insulating medium and outer conductor with periodic slots.

Transverse electromagnetic waves are transmitted from the transmitting end to the other end of the cable via a coaxial cable. When the outer conductor of the cable is completely closed, the signal transmitted by the cable is completely shielded from the outside world, and there is no electromagnetic field outside the cable, or in other words, there is no electromagnetic radiation measured. Similarly, the external electromagnetic field does not affect the signal inside the cable.

However, through the slots in the outer conductor of the coaxial cable, a part of the electromagnetic energy transmitted in the cable is sent to the outside environment. Similarly, external energy can be transferred to the inside of the cable. Slots in the outer conductor create a coupling between the electromagnetic field inside the cable and the external radio waves.

The specific coupling mechanism depends on the arrangement of the slots.

At present, leakage coaxial cables can be divided into coupling leakage cables and radial leakage cables.

Coupled leaky coaxial cable.

Radial leakage coaxial cable.

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The former deliberately makes the shielding layer of the coaxial cable not so perfect, so that the radio frequency signal transmitted in the cable leaks out, so as to achieve the purpose of propagating and receiving foreign radio waves.

The latter is purely used to transmit RF signals, so that the signal does not leak and lose energy.