2 pairs or 4 pairs

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 Question by Mohamed aly posted 01 Feb 2002
 2 pairs or 4 pairs
i'm asking about cat 5 cables, i have made many cables using just 2 pairs (orange, org/wht, green, grn/wht) and it works just fine 100mbps and full duplex. so my question is what the use of the other 2 pairs if you could run your network without even installing them???
 Answer by Dmitri Abaimov posted 01 Feb 2002
Dear Mohamed,
Talking about network you are referring to Ethernet most likely. However, structured cabling system has to be ready to accommodate for as many applications as possible. It means that if you ever have to install an application that require all 4-pairs (there aren't many as yet, it's true), you can do so without changing your cables. This would really save plenty of time and money if you don't have to re-pull the cables throughout your building every time you change application.
Besides, there are couple versions of Ethernet that require all 4 pairs too. There is for example 4-pair version of Gigabit Ethernet standard under development right now.
So, again, you may not need all four pairs by now, but it's quite possible that you'll have to use them all in future.

Dmitri Abaimov, RCDD

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