ethernet – Does it work to use CAT6 cable between two CAT5 cables?

A short answer is absolutely; CAT6 is backwards compatible to CAT5.

The full answer; since CAT ANSI ratings for cables describe the quality of the wires and speed/attenuation rating of the cable, and NOT the connectors and pin-out of the cables, “Not necessarily“.

It sounds like you are using cables with RJ-45 connectors. Usually people refer to these cables as “Ethernet” cables, although Ethernet is a layer 2 networking protocol and not a type of cable. I’m going to infer that you have networking jacks in each room with a punchdown block for these RJ-45 connectors, and that they are 8p-8c. Assuming all this, because your question was about the rating of the wires within the cables, and not in regards to the pin-out on the ends of the cables, the correct answer is “Maybe!”. For example, if the jacks in the wall are pinned out in in a non-TIA configuration (neither 568A or 568B), you will not be getting a usable signal over the connection. While an unlikely scenario it is certainly possible; it is worth understanding the CAT rating of the cable is not the only relevant factor in determining your cabling success or failure.

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