Configuracion Utp Ponchado

9

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COLOR-CODE STANDARDS

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La s t update d: 8/9 /2 0 04

Again, please bear with me... Let's start with simple pin-out
diagrams of the two types of UTP Ethernetcables and watch
how committees can make a can of worms out of them. Here
are the diagrams:

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Two wire color-code standards apply : EIA/TIA 568A and EIA/TIA
568B. The codes are c ommonly depicted with RJ-45 jacks as
follows (the view is fromthe front of the jac ks):

PMC- Mo dular Plug

技科
技科
技科
技科

Note that the TX (transmitter) pins are connected to
corresponding RX (receiver) pins, plus to plus and minus to
minus. And thatyou must use a crossover cable to c onnec t
units with identical interfaces. If you us e a straight-through
cable, one of the two units must, in effect, perform the cross -over
function.

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If we apply the 568A color code and s how all eight wires, our
pin-out look s like this:Note that pins 4, 5, 7, and 8 and the blue and brown pairs are
not us ed in either standard. Quite contrary to what you may
read elsewhere, these pins and wires are not used or required to
implement100BASE-TX duplexing--they are just plain was ted.
However, the actual cables are not physic ally that simple. In the
diagrams, the orange pair of wires are not adjacent. The blue
pair is ups...