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Message: <blockquote data-quote="kkr" data-source="post: 5089110" data-attributes="member: 103896">meka balanna!!<a href="http://images.google.lk/imgres?imgurl=http://i.ehow.com/images/GlobalPhoto/Articles/2110486/ethcablerj45cr_Full.jpg&imgrefurl=http://www.ehow.com/how_2110486_share-files-between-two-computers.html&usg=__x4Ah9HwLEoGTn5TQKSZV40rAU5E=&h=250&w=400&sz=33&hl=en&start=14&tbnid=d6pKipZ144BJ1M:&tbnh=78&tbnw=124&prev=/images%3Fq%3DHow%2Bto%2BConnect%2BTwo%2BComputers%2BWith%2Ba%2BCrossover%2BCable%26gbv%3D2%26hl%3Den%26sa%3DG" target="_blank">http://images.google.lk/imgres?imgurl=http://i.ehow.com/images/GlobalPhoto/Articles/2110486/ethcablerj45cr_Full.jpg&imgrefurl=http://www.ehow.com/how_2110486_share-files-between-two-computers.html&usg=__x4Ah9HwLEoGTn5TQKSZV40rAU5E=&h=250&w=400&sz=33&hl=en&start=14&tbnid=d6pKipZ144BJ1M:&tbnh=78&tbnw=124&prev=/images%3Fq%3DHow%2Bto%2BConnect%2BTwo%2BComputers%2BWith%2Ba%2BCrossover%2BCable%26gbv%3D2%26hl%3Den%26sa%3DG</a>Crossover clip karanne pc 2 pc walata.meka balanna.COLOR-CODE STANDARDS  Last updated: 8/9/2004 Again, please bear with me...  Let's start with simple     pin-out diagrams of the two types of UTP Ethernet cables and watch how committees     can make a can of worms out of them.  Here are the diagrams:<img src="http://www.duxcw.com/digest/Howto/network/cable/out1.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />  Note that the TX (transmitter) pins are connected     to corresponding RX (receiver) pins, plus to plus and minus to minus.  And     that  you must use a crossover cable to connect units with identical     interfaces.  If you use a straight-through cable, one of the two units     must, in effect, perform the cross-over function.  Two wire color-code standards apply: EIA/TIA 568A and EIA/TIA     568B.The codes are commonly depicted with RJ-45 jacks as     follows (the view is from the front of the jacks):         <img src="http://www.duxcw.com/digest/Howto/network/cable/568ajck.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />      <img src="http://www.duxcw.com/digest/Howto/network/cable/568bjck.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />      If we apply the 568A color code and show all eight wires, our pin-out looks like this: <img src="http://www.duxcw.com/digest/Howto/network/cable/out2.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />  Note that pins 4, 5, 7, and 8 and the blue and brown pairs     are not used in either standard.  Quite contrary to what you may read     elsewhere, these pins and wires are not used or required to implement 100BASE-TX     duplexing--they are just plain wasted. However, the actual cables are not physically that simple.  In     the diagrams, the orange pair of wires are not adjacent.  The blue pair     is upside-down.  The right ends match RJ-45 jacks and the left ends     do not.  If, for example, we invert the left side of the 568A "straight"-thru     cable to match a 568A jack--put one 180° twist in the entire cable from end-to-end--and     twist together and rearrange the appropriate pairs, we get the following     can-of-worms:<img src="http://www.duxcw.com/digest/Howto/network/cable/wrms.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />This     further emphasizes, I hope,  the importance of the word "twist" in     making network cables which will work.  You cannot use an flat-untwisted     telephone cable for a network cable.  Furthermore, you must use a pair     of twisted wires to connect a set of transmitter pins to their corresponding     receiver pins.  You cannot use a wire from one pair and another wire     from a different pair.  Keeping the above principles in mind, we can     simplify the diagram for a 568A straight-thru cable by untwisting  the     wires, except the 180° twist in the entire cable, and bending the ends upward.  Likewise,     if we exchange the green and orange pairs in the 568A diagram we will get     a simplified diagram for a 568B straight-thru cable.  If we cross the     green and orange pairs in the 568A diagram we will arrive at a simplified     diagram for a crossover cable.  All three are shown below.          <img src="http://www.duxcw.com/digest/Howto/network/cable/out3.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />       </blockquote>

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