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The gigabit Ethernet standard requires that all pins be connected.
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So this is an example of a crossover cable for gigabit using the T568B standard.
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Notice all pins are configured in a crossover fashion
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all 4 pairs of wires are used in this example.
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Now in the past you�d have to know when to use a straight through or crossover cable.
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Any of these implementations would use a straight through cable.
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So router to switch, PC to switch, PC to bridge or PC to hub.
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Any of these implementations would use a crossover cable.
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So router to router, switch to switch, PC to PC or hub to hub
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or bridge to switch, PC to server, hub to switch and once again
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router to router, all require crossover cables.
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However today automatic crossover or auto MDIX is widely used.
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Auto MDIX was introduced in 1998
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and it made to the requirements for crossover cables obsolete
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MDI devices are typically routers or PCs
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MDIX devices are typically switches or hubs.
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So they are Medium Dependent Interface crossover devices.
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And in the past you would need to connect an MDI device
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such as a PC to switch or hub.
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In the old days once again, certain ports would have a button to flip the roll
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from MDIX to MDI which would allow you to connect a switch to a switch
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using a straight through cable.
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However today in a lot of cases, auto MDI/MDIX
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allows for automatic switching once the cable is connected.
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The devices can auto detect the cable type
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so there�s no need to worry as much about cable types today.
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The straight through cable as an example
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could be used between hubs or between switches.
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So in the past, you used to have to use a crossover cable
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between 2 switches but that�s not necessarily required today.
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Straight through cables could be used
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and devices would work out which side is MDI and which side is MDIX.
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However be careful that�s not always true.
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When on sites you may encounter an older Cisco switch
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that doesn�t support auto MDI/MDIX.
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So you may have to use the correct cabling type between all the devices.
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