In most office and home environments, the Ethernet cable used for connection relies on the twisted pair in the overall cable—Cat 5, Cat 6, and Cat 7 all use this format. Winding two wires together can balance the current, that is, the current in one wire moves in one direction, and the current in the other wire in the pair of wires moves in the other direction, so that Can make the electric field around the twisted pair cancel each other out.
In this way, data can be transmitted over considerable lengths without the need for undue precautions.
Since there are several pairs of twisted wires in a particular network cable, the number of twisted wires per unit length is different for each pair-the rate is based on prime numbers, so no two twisted wires are aligned. This reduces crosstalk within the cable.
Ethernet cables come in various lengths, such as patch cables, or the cables themselves can be used in systems, buildings, etc. A crimping tool can then be used to connect the terminal to the desired connector. These network cables are available in a variety of lengths-there are very long Ethernet cables to choose from, the longest of which can be up to 75 meters.
Early network cables were not shielded, but later cables were shielded to improve performance. For example, unshielded twisted pair (UTP) may be satisfactory for short-term operation between a computer and a router, but foil-shielded cables, FTP, are best for long-term operation or in areas where the cable passes through high electrical noise.
There are different ways to shield Ethernet cables. The most common is to place a shield around each twisted pair. This not only provides shielding for the cable externally, but also reduces crosstalk between internal twisted pairs. Manufacturers can further improve performance by placing shields around all conductors of the cable under the cable sheath. There are different codes to indicate different shielding types:
● U/UTP-Unshielded cable, unshielded twisted pairs
● F/UTP-Foil shielded cable, unshielded twisted pairs
● U/FTP-Unshielded cable, foil shielded twisted pairs
● S/FTP-braided shielded cable, foil shielded twisted pairs
Where: TP = twisted pair, U = unshielded, F = foil shielded, S = braided shielding.
The further difference between Cat 5, Cat 5e, Cat 6, Cat 6e or Cat 7 in the Ethernet cable is whether the cable uses solid wire or stranded wire. As the description implies, a solid cable uses a single piece of copper as the electrical conductor in each wire of the cable, while a stranded wire uses a series of copper strands together. Although when buying a patch cable, it may not be necessary to know this, it may be important when installing a long cable to run, because each type is slightly more suitable for different applications.
● Stranded cable: This type of wire is more flexible and it is more applicable for Ethernet cables where the cable may be moved-often it is idea for patch leads at desks or general connections to PCs, etc where some movement may be needed and expected.
● Solid cable: Solid cable is not as flexible as the stranded type, but it is also more durable. This makes it best for use in permanent installations like cable installations under floors, embedded in walls and the like.