Even with the advent of the first computers came the need for a convenient and fast way digital communication between them.Perforated sheets, tapes and discs (first flexible, and then hard), optical media though partly solved the problem, but their use has one drawback - it was necessary somehow to deliver media data to the target computer, so "convenience "was very arbitrary.
is not surprising that in the eighties there was a possibility of transferring information between digital devices through the organization of a network connection between them (Ethernet).Each computer establishes a special adapter (NIC), which connects the coaxial cable is connected.This allowed to transmit data directly, in accordance with Ethernet 10BASE2 (other species are less well known and not widely available).However, the standard required that the cable impedance is 50 ohms, making it difficult to eliminate possible damage.
With the advent of more modern, fast Ethernet, supports transfer rates up to 100 megabits, coaxial cable was replaced with twisted pair.In addition to reducing the cost of a break in any of the living can just twist and recover the segment.What is a twisted pair?It is a few pairs of isolated conductors, twisted in pairs and assembled in a single casing.The conductor can be lived as a whole, and consisting of a thin copper hair.The first option - the trunk is usually used for installation in the walls to distribution outlets.Step plexus every couple is different, which reduces crosstalk.Wires are distinguished by the color of isolation, so the "buzzer" is not necessary.
Sometimes the question arises, what is the patch cord.This connection cable-connectors on the ends.Typically, the length is limited to 5 m, even in an office standard TSB-75 this limitation.If you want to connect two computers to each other, the patch cable can be purchased at any store of computer technology.
way, as a rule, the cable of the "twisted pair".And the buyer need not think about how to compress the twisted pair, because the connectors are already connected in a certain way (usually a PC-to-PC, cross-connect, or "crossover").Note that many modern devices automatically detect the type of connection, and adjust to it.However, sometimes you have to understand yourself how to compress the twisted pair.For example, in self-installation network.
In this case it is necessary to read the relevant forums and specifications.By the way, how to compress the twisted pair, there is nothing complicated - just a little care and accuracy.
can buy special crimping pliers, the price is quite accessible.Although, with due skill, all you can do, even nails.
so as to compress the twisted pair?Take the cable itself (twisted pair Category 5 for 100 Mbps maximum distance - about 130 m) and two RJ-45 connector.Trim the edges of the cable by aligning it and cutting off possible damage.Remove the outer layer of insulation.The length of this portion depends on the type of connector: the latter must fix the cover part and not hang on some conductors.Couples unravel and align (they must protrude 1cm).In accordance with the scheme (see below), insert wires into the connector.Using tongs connect wires with him.
There are two ways to crimp - T568A (company Siemon) and T568B (AT & amp; T).Most often used the other species.The first signals are transmitted in pairs "white-green" and "white-orange", as well as orange and green wires.The second is a pair of "white-orange" and "green and white", and white with green.
to connect multiple devices (hub-to-PC) is used the same way to connect on both sides.If you need to connect two computers or two hub from one side of the cable bred T568A, and on the other - on the T568V.Visual wiring pattern can be easily found on the relevant resources on the network.
Council for "lazy": To create a simple network of two PCs you can buy ready-made patch cord and cable "twisted pair" of desired length.Cut the patch cord in the middle, clean the ends of the wires on it and basic cable, twist (solder) cores according to the color coding.Insulated.This solution works well at distances up to 140 m.
