<div dir="ltr"><div dir="ltr">I would use single fiber CWDM muxing and OADM, then you can get it down to 7-8 switches per fiber.  CWDM single fiber has a max of 9 channels and the optics are typically less expensive.<div><div><br></div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><span style="font-size:12.8px">Erich Kaiser</span><div style="font-size:12.8px">The Fusion Network</div><div style="font-size:12.8px"><a href="mailto:erich@gotfusion.net" style="color:rgb(17,85,204)" target="_blank">erich@gotfusion.net</a></div></div></div></div></div></div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Feb 26, 2020 at 7:43 AM Mike Hammett <<a href="mailto:nanog@ics-il.net">nanog@ics-il.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:rgb(0,0,0)">DWDM can be done fairly cheap. Some combination of MUXes and OADM modules along the way. One possible solution is:<div><br></div><div>First floor: <a href="https://www.fs.com/products/35887.html" target="_blank">https://www.fs.com/products/35887.html</a></div><div>Every floor between: <a href="https://www.fs.com/products/70427.html" target="_blank">https://www.fs.com/products/70427.html</a></div><div>Top floor: <a href="https://www.fs.com/products/35887.html" style="font-size:13.3333px" target="_blank">https://www.fs.com/products/35887.html</a></div><div><br></div><div>Every floor gets 10G to aggregation switches on the top floor and bottom floor. The aggregation switches directly connect via the second pair.<br><br><div><span name="x"></span><br style="color:rgb(0,0,0);font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br style="color:rgb(0,0,0);font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span>-----</span><br style="color:rgb(0,0,0);font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span>Mike Hammett</span><br style="color:rgb(0,0,0);font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><a href="http://www.ics-il.com/" style="font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" rel="nofollow noopener noreferrer" target="_blank">Intelligent Computing Solutions</a><br style="color:rgb(0,0,0);font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><a href="https://www.facebook.com/ICSIL" style="font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" rel="nofollow noopener noreferrer" target="_blank"><img src="http://www.ics-il.com/images/fbicon.png"></a><a href="https://plus.google.com/+IntelligentComputingSolutionsDeKalb" style="font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" rel="nofollow noopener noreferrer" target="_blank"><img src="http://www.ics-il.com/images/googleicon.png"></a><a href="https://www.linkedin.com/company/intelligent-computing-solutions" style="font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" rel="nofollow noopener noreferrer" target="_blank"><img src="http://www.ics-il.com/images/linkedinicon.png"></a><a href="https://twitter.com/ICSIL" style="font-family:"times new roman";font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" rel="nofollow noopener noreferrer" target="_blank"><img src="http://www.ics-il.com/images/twittericon.png"></a><br style="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irs running up the building riser. I need to put a POE switch on each floor using this fiber.</div><br><div>The idea is to cut the fiber at each floor and insert a switch and daisy chain the switches together using one pair, and using the other pair as the failover side of the ring going back to the source so if one device fails it doesn’t take the whole string down.</div><br><div>The problem here is how many switches can be strung together and I would not try more than 3 to 5. This is not something I typically do (stacking switches). I have fears of STP and/or RSTP issue stacking past Ethernet switch to switch limits (if they still exist??)</div><br><div>Is there a device with a similar protocol as the old 3com (now HP IDF) stacking capability via fiber?</div><br><div>I’d like to use something inexpensive as its to power ubiquiti wifi on each floor. Ideally if you know something I don’t about ubiquiti switches that can do this I’d appreciate knowing.</div><br><div>Norman</div></blockquote></div></blockquote></div><br></div></div></div></blockquote></div></div>