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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-AU style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><i><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>whether moisture directly against a fibre changes the refractive index of the fibre to an extent that communications is affected.<o:p></o:p></span></i></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Unless the moisture somehow penetrates the glass, no. Fibres are constructed with a coaxial core and cladding both made of glass with different refractive indexes. The internal reflective boundary (that keeps the light inside the core) is between the grades of glass, not an external glass/air boundary.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-AU style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><i><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The construction profile of fibre cables being laid by the NBN from the exchange (redundant term in the NBN world??) to the home.<o:p></o:p></span></i></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I remember in a previous life specifying optical cables with an armoured housing designed to resist burrowing wombats…. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Not sure NBNCo is going that far.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Mike.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> ausnog-bounces@lists.ausnog.net [mailto:ausnog-bounces@lists.ausnog.net] <b>On Behalf Of </b>Rod Veith<br><b>Sent:</b> Friday, 9 March 2012 9:50 AM<br><b>To:</b> ausnog@lists.ausnog.net<br><b>Subject:</b> [AusNOG] Water in Fibre cables<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>There are many things that can pierce cable sheaths allowing moisture in without necessarily breaking communications.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The odd rat bite, tree roots, ants, backhoe, termites etc as many years of sheathed copper has shown. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What I‘m curious about now is:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-AU style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>whether moisture directly against a fibre changes the refractive index of the fibre to an extent that communications is affected.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-AU style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The construction profile of fibre cables being laid by the NBN from the exchange (redundant term in the NBN world??) to the home.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It has been many many years since I was last inside a manhole looking into cables. Still remember some on-the-job training and once beating a lead joint into <s>submission</s> shape and turning some brown paper coated wires a slightly darker shade of brown. Gotta respect those blow torches </span><span lang=EN-AU style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Rod<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-AU style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div></body></html>