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A Ethernet cable has 4 pairs of data lines. In normal conditions only two pairs are used, one as a Tx pair and another as Rx pair. So two pairs are left unused. Is it possible to make use of these 2 pairs to carry another independent connection?
Of course I am expecting some obstacles. Maybe it will lead to a lot of noise and subsequent signal degradation. Can this be avoided by using a different color code?
It should be noted that I am not using Gigabit hardware. I just have 10 Mbps. So if I give this a try, will my connection speed be further reduced?
Another reason why this solution will be great is because I have only one power outlet in my room.
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Sure it can. If you're willing to restrict yourself to fast ethernet speeds (or worse), there's devices that would split up an ethernet connection into 2 pairs for you. I've even seen stock cables that only have 4 connectors, and there was a little wierdness with it. However, modern gigabit ethernet needs all 4 pairs.
– Journeyman Geek – 2015-10-04T08:50:21.877@JourneymanGeek Why would the speeds be reduced? – daltonfury42 – 2015-10-04T08:53:33.933
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Cause you need 4 pairs for gigabit (so you'll be running at fast ethernet speeds), and as per my answer for the second question I referenced, empirically some gigabit ethernet cards or switches drop down to 10mbps when you do this. A switch would really be the intelligent way to multiplex a ethernet cable.
– Journeyman Geek – 2015-10-04T08:56:06.670@JourneymanGeek My existing connecting is not gigabit. (University Network) Will I have any difference then? – daltonfury42 – 2015-10-04T08:57:20.013
Well, you'll need to have the cable split on both ends – Journeyman Geek – 2015-10-04T08:58:06.077
Just buy a cheap switch! You can get one for €10/$10. – Linef4ult – 2015-10-04T08:58:06.590
@Linef4ult why go for a switch($10) if I can get the same result my spending less than $1? The only question is weather it is reliable. – daltonfury42 – 2015-10-04T08:59:57.270
@daltonfury42: Well that's exactly the thing, it's not the same result. We've had such "creative" wiring in some places here at $WORK, and ... it isn't exactly fast nor reliable. – user1686 – 2015-10-04T09:01:12.893
@daltonfury42 but it wont work. If its your house you can split the CAT5/6 at either end into two jacks and make 2x connections from 1 cable. But you can only split one end. You'll just kill the link. – Linef4ult – 2015-10-04T10:03:39.817
@Linef4ult I intend to split on either ends. – daltonfury42 – 2015-10-04T10:04:37.023
Does the Uni give you access to their switches? – Linef4ult – 2015-10-04T10:05:39.297
@Linef4ult They provide a switch at each floor of our hostel and I know the LAN admin ;-). – daltonfury42 – 2015-10-04T10:06:51.417