Xref: utzoo comp.periphs.scsi:893 comp.sys.mac.hardware:4775 comp.sys.apple2:4464 Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!zaphod.mps.ohio-state.edu!samsung!noose.ecn.purdue.edu!ecn.purdue.edu!cyliax From: cyliax@ecn.purdue.edu (Ingo Cyliax) Newsgroups: comp.periphs.scsi,comp.sys.mac.hardware,comp.sys.apple2 Subject: Re: SCSI cable pinouts wanted Message-ID: <1990Aug10.095005@ecn.purdue.edu> Date: 10 Aug 90 13:50:05 GMT References: <4460UD182050@NDSUVM1> <32474@cup.portal.com> Sender: news@ecn.purdue.edu (USENET news) Reply-To: cyliax@ecn.purdue.edu (Ingo Cyliax) Organization: Purdue University Engineering Computer Network Lines: 39 In article , urlichs@smurf.sub.org (Matthias Urlichs) writes: |> BTW, if you do it "right", these two ribbon cables are going to be darn close |> together. Apple's newer SCSI devices fold these tightly and lead them through |> a largish ferrite ring. Does anyone know the reason for this? (It can't be to |> minimize crosstalk because you have to fold the ribbon cables tightly together |> to get them through the ferrite ring, or can it?) |> It's to filter out any RF that maybe generated by the drive electronics. If you don't do this you send out all kinds of RF onto the cable, which acts like an antenna. This is OK in an office, but at home it may interfere with radio & TV reception. |> -- |> Matthias Urlichs -- urlichs@smurf.sub.org -- urlichs@smurf.ira.uka.de |> Humboldtstrasse 7 - 7500 Karlsruhe 1 - FRG -- +49+721+621127(Voice)/621227(PEP) -ingo -- /* Ingo Cyliax ECN, Electrical Engineering Bldg. * * cyliax@ecn.purdue.edu Purdue University, W. Lafayette,IN 47907 * * ing@cc.purdue.edu Work: (317) 494-9523 * * cyliax@pur-ee.UUCP Home: (317) 474-0031 */