RE: Node spacing issue
"John Dammeyer" <[email protected]> Thu, 11 Feb 2021 00:55:11 -0800
| Newsgroups | gmane.comp.hardware.bus.can |
|---|---|
| Message-ID | <[email protected]> |
This is a multipart message in MIME format. ------=_NextPart_000_09AE_01D70010.8DB86E30 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Heikki, That's a really good way of looking at it. I like that. John =20 =20 From: [email protected] [mailto:canlist-owner@vector-info= rmatik.com] On Behalf Of Heikki Saha Sent: February-11-21 12:27 AM To: [email protected] Subject: [CANLIST] Node spacing issue =20 Hello, =20 The issue John mentioned regarding inter-node spacing is interesting. There= are not absolute spacing limits, but the issue is rather related to the en= tire network -- if there are groups of nodes connected as a start or daisy-= chained with very short connections and long plain cable between the groups= , the result is different impedance domains. The impedance transition point= s introduce problematic reflections. We have done some nice repairs by line= arizing the topologies and changing into longer interconnections within the= groups. Steve's publications are inspiring and easy to understand -- every= one should consider networks as a number of infinitely short impendaces con= nected in series. =20 Best regards, =20 Heikki Saha, CTO M.Sc. Automation Dr.Tech. Electronics TK Engineering Oy Hovioikeudenpuistikko 13 as 3, 65100 Vaasa +358 (0)50 588 6894 email: [email protected] skype: heikki.saha_tke =20 We are also in the 17th iCC: https://www.can-cia.org/icc ------=_NextPart_000_09AE_01D70010.8DB86E30 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr= osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:= //www.w3.org/TR/REC-html40"><head><meta http-equiv=3DContent-Type content= =3D"text/html; charset=3Dutf-8"><meta name=3DProgId content=3DWord.Document= ><meta name=3DGenerator content=3D"Microsoft Word 14"><meta name=3DOriginat= or content=3D"Microsoft Word 14"><link rel=3DFile-List href=3D"cid:filelist= [email protected]"><!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG/> </o:OfficeDocumentSettings> 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v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--></head><body lang=3DEN-CA link=3Dblue vli= nk=3Dpurple style=3D'tab-interval:36.0pt'><div class=3DWordSection1><p clas= s=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>Heikki,<o:p></= o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#= 1F497D'>That's a really good way of looking at it. I like that.<o:p></o:p><= /span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497= D'>John<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:= 11.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=3DMsoNormal><spa= n style=3D'font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><div= style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0p= t'><div><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.= 0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US style=3D'font-s= ize:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times= New Roman";mso-ansi-language:EN-US'>From:</span></b><span lang=3DEN-US sty= le=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-f= amily:"Times New Roman";mso-ansi-language:EN-US'> canlist-owner@vector-info= rmatik.com [mailto:[email protected]] <b>On Behalf Of </b= >Heikki Saha<br><b>Sent:</b> February-11-21 12:27 AM<br><b>To:</b> canlist@= canlist.org<br><b>Subject:</b> [CANLIST] Node spacing issue<o:p></o:p></spa= n></p></div></div><p class=3DMsoNormal><o:p> </o:p></p><div><p class= =3DMsoNormal><span style=3D'font-size:10.0pt'>Hello,</span><o:p></o:p></p><= div><p class=3DMsoNormal><o:p> </o:p></p></div><div><div><p class=3DMs= oNormal><span style=3D'font-size:10.0pt'>The issue John mentioned regarding= inter-node spacing is interesting. There are not absolute spacing limits, = but the issue is rather related to the entire network -- if there are group= s of nodes connected as a start or daisy-chained with very short connection= s and long plain cable between the groups, the result is different impedanc= e domains. The impedance transition points introduce problematic reflection= s. We have done some nice repairs by linearizing the topologies and changin= g into longer interconnections within the groups. Steve's publications= are inspiring and easy to understand -- everyone should consider networks = as a number of infinitely short impendaces connected in series.<o:p></= o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'font-size:10.= 0pt'><o:p> </o:p></span></p></div><div><p class=3DMsoNormal><span styl= e=3D'font-size:10.0pt'>Best regards,<o:p></o:p></span></p></div><div><p cla= ss=3DMsoNormal><span style=3D'font-size:10.0pt'><o:p> </o:p></span></p= ></div></div><div><div><div><div><div><div><div><div><div><div><div><p clas= s=3DMsoNormal>Heikki Saha, CTO<br> M.Sc. Automation<br> Dr.Tech= . Electronics<br>TK Engineering Oy<br><span style=3D'font-family:"Arial","s= ans-serif"'>Hovioikeudenpuistikko 13 <span style=3D'color:#333333;backgroun= d:white'>as 3, 65100 Vaasa</span></span><br>+358 (0)50 588 6894<br>email: <= a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</= a><br>skype: heikki.saha_tke<o:p></o:p></p></div><div><p class=3DMsoNormal>= <o:p> </o:p></p><div><p class=3DMsoNormal>We are also in the 17th iCC:= <a href=3D"https://www.can-cia.org/icc" target=3D"_blank">https://www.can-= cia.org/icc</a><o:p></o:p></p></div></div></div></div></div></div></div></d= iv></div></div></div></div></div></div></div></body></html> ------=_NextPart_000_09AE_01D70010.8DB86E30-- -- Subscribe, unscribe, and archives at www.canlist.org - report any problems to <[email protected]>