Was going to post the same thing. I had a new construction townhouse in the Bay Area that had Ethernet. The max speed was either 10 or 100 Mbps depending on w

Was going to post the same thing. I had a new construction townhouse in the Bay Area that had Ethernet. The max speed was either 10 or 100 Mbps depending on which jack was used. Opened up the jacks to discover that the cables were stripped of the jacket for at least 6 inches, the twisted pairs were untwisted and this mess was jammed into the wall behind the jack. At every single location. The worst offender wouldn't connect at all. That had a foot of jacket stripped off. Re-crimping all the jacks made everything work at 1 gigabit. In summary, general tradespeople don't know how to install Ethernet.