What are the weak cables commonly used in LED display?

Introduction of cables: The weak cables commonly used on LED display projects are 4 pairs of super five twisted pairs (network cables), shielded soft wires, optical fibers, coaxial cables, etc.

4 pairs of super five twisted pair because often in the local area network cabling is also known as 8-core network cable, is made of 8 different colours of the line into 4 pairs of twisted together, the role of the team twisted is to minimize the impact of electromagnetic radiation and external electromagnetic interference, twisted pair can be distinguished as shielded twisted (STP) and unshielded twisted pair (UTP) according to whether or not the additional metal wire set of shielding layer. In the displayed project for the display signal close communication (not more than 100 m), but also for the display of other control signal transmission. The general length specification is 305m/box (1000ft).

Features

Shielded soft wire is similar to the ordinary wire, the wire diameter specifications are the same, mainly in the sheath layer and the internal cable between a layer of metal mesh shielding layer, characterised by a higher density of cable weave, the line is more flexible, easy to lay, anti-signal interference.

Coaxial cables are made of hard copper wire as a core, covered with a layer of insulating material. This insulation is surrounded by a densely woven mesh conductor and covered with a protective layer of material. There are two types of coaxial cable in widespread use. One is the 50-ohm cable, used for digital transmission, also called baseband coaxial cable as it is mostly used for baseband transmission and is often used for network connections. The other is 75 Ohm cable, used for analogue transmission. It is commonly used for cable TV RF signals and general video signal transmission.

Optical Fibre

Optical fibres are similar to coaxial cables, except that they do not have a mesh shield. At the centre is the glass core through which the light travels. In a multimode fibre, the core is 15μm to 50μm in diameter, roughly the thickness of a human hair, whereas a single-mode fibre has a core diameter of 8μm to 10μm. The core is surrounded by a glass envelope, with a lower refractive index than the core to keep the fiber inside the core. On the outside is a thin plastic jacket to protect the envelope. Fibres are usually tied into bundles and protected by an outer jacket. The core is usually a double concentric cylinder with a small cross-sectional area made of quartz glass, which is brittle and prone to breakage and therefore requires an additional protective layer. The transmission points are divided into Single Mode Fiber and Multi Mode Fiber. Single-mode fibres have a small core diameter and can only be transmitted in a single mode at a given working wavelength. It has a wide transmission band and a large transmission capacity. The general transmission distance is over 2 km. Multimode fibres are fibres that can transmit in multiple modes simultaneously at a given wavelength. Compared with single-mode fibres, the transmission performance of multimode fibres is poor, with a general transmission distance of around 500m. Depending on the working environment, it is divided into outdoor fibre and indoor fibre, and the length can be intercepted according to the actual length.