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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?

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    \$\begingroup\$ How fast are you actually expecting to send data over the resulting cable? \$\endgroup\$ Jul 18 '18 at 13:12
  • \$\begingroup\$ What insertion loss does it cause? \$\endgroup\$
    – Andy aka
    Jul 18 '18 at 13:17
  • \$\begingroup\$ @ElliotAlderson Here is the device: scanivalve.com/wp-content/uploads/2017/03/MPS4264_1703.pdf But it doesn't say anything about the rate but something called "Data Output Rate" \$\endgroup\$
    – user1245
    Jul 18 '18 at 13:43
  • \$\begingroup\$ 10/100/1000MBps which? \$\endgroup\$ Jul 18 '18 at 16:30
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    \$\begingroup\$ I am wondering why three couplers would be needed. Joining three cables only requires two couplers. RJ45---cable---RJ45 COUPLER RJ45---cable---RJ45 COUPLER RJ45---cable---RJ45 \$\endgroup\$ Jan 29 '19 at 14:23
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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.

enter image description here

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.

enter image description here

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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.

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