On 04/04/2017 02:49 PM, Kai Krakow wrote: > No, if you have the same wrong on both sides, the LEDs will still show > correct blinking order. Think of it like this: If you use order > 7-5-3-1-2-4-6-8 on both sides, blinking LED 1 on one side will blink > the same LED on the other side because they both connect to wire 7. But > the twisted pairs that should be twisted are no longer because now you > connected pair 1 in the connector to wire 7 and 5 which belong to > different pairs in the wire. The wire twists pair (7,8) and (4,5). On > the long run, interference now cannot be canceled out because this > only works if wires are twisted in the same pair. The connector (and > ethernet standard) expects the following pairs on the connector: > > A-A-B-C-C-B-D-D > 1-2-3-4-5-6-7-8 > > For electrical reasons it also expects a white wire alternating with a > colored pair, which makes the following pairs: > > A = (1,2) > B = (3,6) > C = (5,4) > D = (7,8) > > Or: > > A-a B c-C b D-d > ^_____^ > > With the capital letters being either all white or all colored (this > doesn't depend as long as it's the same on both sides). > > You could open the problematic wall outlets and check the cabling > yourself. Keep in mind that unmounting the wall outlet may make the > problem of bent cables even worse due to moving and bending the wires > even more.
I'll pitch in one interesting thing of note: the local supplier here went with el-cheapo Chinese made punch down and crimp ends some years ago. These are supposed to be 22 AWG wire size, but after dealing with bad connections I found out these Chinese punch downs were more like 24-26 AWG, meaning when punched down it would not make proper contact with the properly spec'ed wire. Dan
