- Mar 17, 2018
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Hey all, looked far and wide on the internet but could not find a solution to this totally ridiculous networking issue I'm having. Using an all-wired system with a Pace 5268ac with Gigabit internet from AT&T. Pace is connected to Windows 8.1 PC through the wall via wall jacks, I'm using shielded Cat6A cables everywhere but have no idea what is in the wall. For months I've been using this (1000mb) setup perfectly.
Got back from a trip and the PC is auto-negotiating 100mbps with no known changes to hardware or firmware. For a while restarting the PC and Pace would solve it, but would only be a few hours or less before it would drop down to 100mbps. Now, never seems to get into full 1000mbps mode. Cable/NIC issue right? Here's where it gets weird: the same exact cable (a known-good, and many other testers), plugged into a Mac 10.13 with a Thunderbolt ethernet adapter, gets the full 1000mbps and has maintained that speed for 24+ hours, enough to satisfy me that it's not downshifting. Even weirder: same exact cable plugged into a totally different PC, a Windows 7 laptop, is capped at 100mbps!! This laptop, plugged directly into the router, sees the full 1000mbps connection correctly autonegotiate.
Clearly there is no physical problem in the wall as my Mac negotiates a perfect full-speed connection (confirmed on Pace, Mac, and speedof.me). What else could possibly be the issue here? I've tried setting manual speeds—just appears disconnected.
EDIT: Forgot to mention, during one of the moments where the PC was working normally, I ran all the tests in the Properties pane in the Device Manager. Came back with all passes and said the network quality was very good. Cable length of 19m which doesn't seem too long in total
Got back from a trip and the PC is auto-negotiating 100mbps with no known changes to hardware or firmware. For a while restarting the PC and Pace would solve it, but would only be a few hours or less before it would drop down to 100mbps. Now, never seems to get into full 1000mbps mode. Cable/NIC issue right? Here's where it gets weird: the same exact cable (a known-good, and many other testers), plugged into a Mac 10.13 with a Thunderbolt ethernet adapter, gets the full 1000mbps and has maintained that speed for 24+ hours, enough to satisfy me that it's not downshifting. Even weirder: same exact cable plugged into a totally different PC, a Windows 7 laptop, is capped at 100mbps!! This laptop, plugged directly into the router, sees the full 1000mbps connection correctly autonegotiate.
Clearly there is no physical problem in the wall as my Mac negotiates a perfect full-speed connection (confirmed on Pace, Mac, and speedof.me). What else could possibly be the issue here? I've tried setting manual speeds—just appears disconnected.
EDIT: Forgot to mention, during one of the moments where the PC was working normally, I ran all the tests in the Properties pane in the Device Manager. Came back with all passes and said the network quality was very good. Cable length of 19m which doesn't seem too long in total
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