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I want to obtain one 90 meters of Ethernet CAT6 cable(with RJ45 connectors) by using three 30 meters of CAT6 cables with RJ45 connectors. The only option I could find is to use three such couplers.
Would using such extenders/couplers cause any performance or noise issues?
I haven't seen a coupler exactly like that one, but I did try using the one below (from Belkin and Monoprice). Out of 8 that I've bought 5 did not work at all. The other three worked... sort of. Even small wiggling of the cable would often break a connection. I ended up buying a whole pull-box of CAT6 and a pack of crimp plugs.
Oh, and in one place where I had to use a socket I've used tool-less Keystone below. It works flawlessly at 1G for many years now. I guess you can make your own coupler out of two sockets like that one. Or cut the plugs off one end of two 30m cables and replace them with sockets, effectively converting patch cable into extension cable. Note that this will also cut the number of contact pairs in half, improving line integrity.
https://en.wikipedia.org/wiki/Category_6_cable
Maximum length When used for 10/100/1000BASE-T, the maximum allowed length of a Cat 6 cable is up to 100 meters (328 ft). This consists of 90 meters (295 ft) of solid "horizontal" cabling between the patch panel and the wall jack, plus 5 meters (16 ft) of stranded patch cable between each jack and the attached device.[8] For 10GBASE-T, an unshielded Cat 6 cable should not exceed 55 meters.[9]
Its possible.
