Am Tue, 4 Apr 2017 15:05:57 -0700 schrieb Daniel Frey <djqf...@gmail.com>:
> 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. That's a good note. I think punch down is similar to LSA plus here in Germany, tho the tools look very different. But with LSA you also push the wire between to cutting contacts. -- Regards, Kai Replies to list-only preferred.
