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</o:shapelayout></xml><![endif]--></head><body lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Agree with Kevin<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'>Also when talking about Cisco SFP’s this is a good link to bookmark for future:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885.html">http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885.html</a> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>has some estimations of distance but these are conservative as you’d expect – actual distance achieved depends upon fibre loss and other linear/non-linear effects that I won’t bore everyone with that are generally worse on MMF<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'>Now OM1 at 1300nm has a loss of 1.5dB per km so that won’t be the problem as long as the mode conditioning cables are used but as we’re all saying the loss of the ‘hops’ is the main loss based issue (once you have mode conditioners)<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'>The SFP in question being a GLC-LH-SM has a tx power of as low as -9.5dBm and a lowest acceptable receive level at -20dBm, which means we have as little as 10.5dB to play with one reflection or splice can be as high as .5dB if done poorly but still 0.1dB if done well so it all adds up<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'>Recommend getting a power meter onto the fibre and see what loss there is at 1300nm (1310nm)<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'>Darren<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 lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US 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>Kevin Harm<br><b>Sent:</b> Friday, 20 April 2012 11:15 AM<br><b>To:</b> Christopher Pollock; Qui Le<br><b>Cc:</b> ausnog@lists.ausnog.net<br><b>Subject:</b> Re: [AusNOG] Fiber connectivity<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>And be aware of the speed / distance limitations<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";background:white'>For OM1, typical transmission speed and distance limits are 100 Mbit/s for distances up to 2 km (</span><a href="http://en.wikipedia.org/wiki/100BASE-FX" title=100BASE-FX><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:windowtext;background:white;text-decoration:none'>100BASE-FX</span></a><span style='font-size:10.0pt;font-family:"Arial","sans-serif";background:white'>), 1 Gbit/s to 220–550 m (</span><a href="http://en.wikipedia.org/wiki/1000BASE-SX" title=1000BASE-SX><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:windowtext;background:white;text-decoration:none'>1000BASE-SX</span></a><span style='font-size:10.0pt;font-family:"Arial","sans-serif";background:white'>), and 10 Gbit/s to 300 m (</span><a href="http://en.wikipedia.org/wiki/10_Gigabit_Ethernet#10GBASE-SR" title="10 Gigabit Ethernet"><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:windowtext;background:white;text-decoration:none'>10GBASE-SR</span></a><span style='font-size:10.0pt;font-family:"Arial","sans-serif";background:white'>)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";background:white'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";background:white'>And, if each hop that you refer to is a patching point, you will introduce loss along the way.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";background:white'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";background:white'>Kev<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'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a href="mailto:ausnog-bounces@lists.ausnog.net">ausnog-bounces@lists.ausnog.net</a> [<a href="mailto:ausnog-bounces@lists.ausnog.net">mailto:ausnog-bounces@lists.ausnog.net</a>] <b>On Behalf Of </b>Christopher Pollock<br><b>Sent:</b> Friday, 20 April 2012 10:55 AM<br><b>To:</b> Qui Le<br><b>Cc:</b> <a href="mailto:ausnog@lists.ausnog.net">ausnog@lists.ausnog.net</a><br><b>Subject:</b> Re: [AusNOG] Fiber connectivity<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Sounds like you're using single mode transceivers with multimode fibre there. Since SM optics rely on total internal reflection and multimode is basically bendy plastic, that will probably never work. You need some multimode SX SFPs.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Cheers,<br clear=all>--<br>Christopher Pollock,<br>io Networks Pty Ltd.<o:p></o:p></p><div><p class=MsoNormal>e. <a href="mailto:chris@ionetworks.com.au" target="_blank">chris@ionetworks.com.au</a><br>p. 1300 1 2 4 8 16<o:p></o:p></p></div><div><p class=MsoNormal>d. 07 3188 7588<o:p></o:p></p></div><div><p class=MsoNormal>m. 0410 747 765<o:p></o:p></p></div><div><p class=MsoNormal>f. 07 3245 0843 <o:p></o:p></p></div><div><p class=MsoNormal>skype: christopherpollock<o:p></o:p></p></div><div><p class=MsoNormal><a href="http://twitter.com/chrisionetworks" target="_blank">twitter.com/chrisionetworks</a><o:p></o:p></p></div><div><div><p class=MsoNormal><a href="http://www.ionetworks.com.au" target="_blank">http://www.ionetworks.com.au</a><br>In-house, Outsourced.<o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Fri, Apr 20, 2012 at 10:44 AM, Qui Le <<a href="mailto:QLe@sydneyoperahouse.com">QLe@sydneyoperahouse.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>We run 550m of OM1 fibre from our Cisco core to a remote site over 6 hops included rack to rack and we can not<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>seem to get any connectivity. Using both Cisco GLC-LH-SM transceivers at both the Core & access Switch.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Does anyone know if there are hops limitations for long haul fibres.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Any advise is much appreciated.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><b><span style='font-family:"Arial","sans-serif";color:#7E7E7E'>Qui Le</span></b><o:p></o:p></p></div><p class=MsoNormal><br>Please consider the environment before printing this email.<br>=====This message is intended for the addressee(s) named and may contain confidential information.<br>If you are not the intended recipient, please delete it and notify the sender.<br>Views expressed in this email are those of the individual sender and are not necessarily the views of the Sydney Opera House Trust=====<o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><br>_______________________________________________<br>AusNOG mailing list<br><a href="mailto:AusNOG@lists.ausnog.net">AusNOG@lists.ausnog.net</a><br><a href="http://lists.ausnog.net/mailman/listinfo/ausnog" target="_blank">http://lists.ausnog.net/mailman/listinfo/ausnog</a><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>