Here is the trailer to the film The Final Days (2005), on Sophie and other members of The White Rose who were arressted and executed on February 22 1943, based on interrogation transcripts.
#history #SophieScholl #Nazigermany #WorldWar2 #Antifascism #film
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I made an alarming discovery tonight. For a project I'm working on, I need to connect to a device using an RJ-45 (8P8C) connector for audio and control signals, and it needs to be shielded. The easy solution is to buy a shielded CAT-6 Ethernet patch cable, cut and strip the wires, and solder them to the right spots. I did that. Inside the cable I found what I expected -- four individually shielded pairs, plus an overall shield. Quality was higher than I expected with substantial foil shields and an overall shield braid of aluminum wire. It was very well made cable.
One thing odd about this cable was that the white wires had no tracer colors, but it was obvious which colors they were paired with. You could plainly see it -- or so I thought.
I wired this gadget up about two weeks ago and got around to testing it tonight. Part of it worked and part of it didn't. This was annoying because I've been building electronics since I was five and with 60 years experience, I don't make many construction mistakes -- like none. I'm methodical because I hate troubleshooting things I build and this should have worked first time.
So, I grabbed the meter and started buzzing things out. Sure enough, I found lack of continuity from pin 5 of the RJ-45 to where it needed to go. I examined everything visually and it was fine. Maybe the RJ-45 was crimped on poorly? This seemed extremely unlikely because the cable sells on Amazon in large numbers and with high ratings.
Then I buzzed out pin 5 to the other white wires and immediately found continuity from pin 5 to the white wire paired with the blue wire. What? It should be paired with the green wire. Hmm.
Yeah, you guessed it. The cable buzzes out fine from end to end, pin to pin, but the wrong whites are twisted with the wrong colors. In my low-frequency / analog application, this causes no harm. But for Ethernet, this is not okay. Ethernet consists of four differential signals sent on twisted pairs acting as transmission lines. It absolutely matters that the correct pair of wires are twisted together in the cable. This patch cable would probably work okay at lower speeds and very short distances -- maybe. But, the truth is this cable is garbage.
So, watch out. If you're buying cables for serious installations and high speed, get a sample, cut it open, and buzz it out. End-to-end continuity isn't the whole story. The correct pairs need to be twisted together.
Jeez. I can't believe I'm even writing about this.
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Also, IEP meeting for the teen.
Also, a contractor on whom we rely to get shit down with a document management system is leaving the contract next week.
So it was a lovely day.
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