<div dir="ltr">BX Optics are great for a big rollout because it minimises Splicing costs and improves installation efficiency - there's only one way the fibre can be patched and plugged in, so the easily-compromised fibre components are handled by dirty contractor hands that forgot to bring a fibre-cleaning tool only once. In one case we had sparkies in a cherry picker connecting fibre to hundreds of nodes, so if they couldn't get it right the first time it might mean significant delays while they returned to ground and called someone.<div><br></div><div>If you're going to go big on BiDi optics, establish a policy early on about which end uses the low-frequency transmit (TX) wavelength, which has better propagation characteristics. Intuition might suggest the more reliable band goes at the datacentre, but operationally you want remote devices to have the more reliable TX as this allows you to differentiate between a marginal fibre path and a power failure when something fails - which will inform if you're sending a guy out to flip a breaker, or if it's an OTDR job for a fibre specialist.</div><div><br></div><div>John</div><div><br></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, 8 Apr 2025 at 18:03, Tony Wicks <<a href="mailto:tony@wicks.co.nz">tony@wicks.co.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div class="msg7568227564544860377"><div lang="EN-NZ" style="overflow-wrap: break-word;"><div class="m_7568227564544860377WordSection1"><p class="MsoNormal"><span>In NZ we use bidi extensively as we are very used to being able to buy pretty cheap DF around the place. In Datacentres owned by non local companies I find they are often confused by it (go figure) so its all too hard. Personally, I would always chose bidi if possible, not just for the conservation of ties but also for the fact they work or not instead of the possibility of a one way disconnect. 100G bidi is still more expensive in the optics and less standard, but 10’s are much the same cost as duplex LR’s.<u></u><u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><div style="border-width:1pt medium medium;border-style:solid none none;border-color:rgb(225,225,225) currentcolor currentcolor;padding:3pt 0cm 0cm"><p class="MsoNormal"><b><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif"> AusNOG <<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a>> <b>On Behalf Of </b>Mitch Kelly<br><b>Sent:</b> Tuesday, 8 April 2025 6:57 pm<br><b>To:</b> Alex Samad <<a href="mailto:alex@samad.com.au" target="_blank">alex@samad.com.au</a>><br><b>Cc:</b> Ausnog <<a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a>><br><b>Subject:</b> Re: [AusNOG] Bidi usage in DC<u></u><u></u></span></p></div><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal">We use about 70% of Duplex SFP's these days.<u></u><u></u></p></div><div><p class="MsoNormal">Ive checked and we have a total of 482 BiDi optics. (Half of those terminate in the DC's)<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal">On Tue, Apr 8, 2025 at 2:40<span style="font-family:Arial,sans-serif"> </span>PM Alex Samad <<a href="mailto:alex@samad.com.au" target="_blank">alex@samad.com.au</a>> wrote:<u></u><u></u></p></div><blockquote style="border-width:medium medium medium 1pt;border-style:none none none solid;border-color:currentcolor currentcolor currentcolor rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt 4.8pt"><div><div><p class="MsoNormal">Hi<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Wondering whats the percent usage of Bidi (single core SFP / TX RX on same fibre).<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Just a curiosity. Try to persuade some people to use Bidi over normal SFP's in the DC.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Alex<u></u><u></u></p></div></div><p class="MsoNormal">_______________________________________________<br>AusNOG mailing list<br><a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><br><a href="https://lists.ausnog.net/mailman/listinfo/ausnog" target="_blank">https://lists.ausnog.net/mailman/listinfo/ausnog</a><u></u><u></u></p></blockquote></div></div></div>_______________________________________________<br>
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