-
Cheers, didn't even know there was solid and stranded (last time I cabled an small office was well over a decade ago - around the time 11mpbs wireless was shiny and new - and hopelessly slow).
Length should be fine, will be patching everything under the stairs in the middle of the house, so I expect it'll be ~20m at most. Though maybe I should run some cables into the loft in prep for next year's planned extension. Still, nowhere near 90m.
Go for solid-core cat6. It's more than enough for gigabit ethernet and much cheaper and easier to work with than cat6a/cat7 - last I heard (although I left the industry 18 months ago), cat7 wasn't formulated as a standard and most manufacturers were having problems even passing cat6a testing.
Try not to exceed 90m in one run (unlikely in a house anyway) and get a cheap tester so you're not tearing your hair out trying to figure out why it's not working!