<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">You could break this into 10x 10g coherent lanes, but you’re going to end up back close to coherent 100g prices.<div><br></div><div>You’re at the threshold distance where you’re past all the short range tech and are seriously pushing it - whereas the 100g coherent tech is just taking off. </div><div><br></div><div>How important is this link?<br><br><div dir="ltr"><div><span style="background-color: rgba(255, 255, 255, 0);">Ms. Benjamin PD Cannon, ASCE<br class="">6x7 Networks & 6x7 Telecom, LLC <br class="">CEO <br class=""><a href="mailto:ben@6by7.net" class="">ben@6by7.net</a><br class="">"The only fully end-to-end encrypted global telecommunications company in the world.”</span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br class="">FCC License KJ6FJJ<br class=""></span></div><span style="background-color: rgba(255, 255, 255, 0);"><br class="Apple-interchange-newline"><span style="width: calc(100% + 48px); margin-left: -24px;"><img webkitattachmentid="b8f15625-f249-4a18-939e-c82081101bcf" apple-inline="yes" id="FEEC6C0B-26AF-4046-A45F-C6094BBF075B" src="cid:245ADEA1-477E-4B5A-989E-9177BDB798AE" class="x-apple-edge-to-edge" _mf_state="2" action="null" title="null" style="width: calc(100% + 48px); margin-left: -24px;" data-unique-identifier=""></span><img webkitattachmentid="dc935d4e-ff46-4d87-a3f1-e9fdd5bd0166" apple-inline="yes" id="2BE0B956-8DD2-4B98-89A2-A51DADDF4DF2" src="cid:B186E2C6-EE26-4B99-A6BD-F71BFE6B78F4" class="" _mf_state="2" action="null" title="null" data-unique-identifier=""></span></div><div dir="ltr"><br><blockquote type="cite">On Oct 30, 2020, at 7:19 AM, Jared Brown <nanog-isp@mail.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><span>Hello NANOG!</span><br><span></span><br><span>I need to push 100G over 100 km of dark fiber. Since there are no 100G pluggable optics with this reach (~25 dB), I have been offered coherent transport systems to solve my problem. This is all good and well, except total system costs start from high five figures.</span><br><span></span><br><span>So, my question is, do I have any other options?</span><br><span></span><br><span>I can't help noticing that you can break out a 100G QSFP into four 25G QSFPs. 25G DWDM systems are relatively inexpensive (low five figures), but can you make 25G DWDM go 100 km?</span><br><span></span><br><span>I only need the one 100G, so I don't really need a highly scalable DWDM system. I can't put anything midspan, or if I could it would cost more than just going with a coherent system.</span><br><span></span><br><span></span><br><span>Jared</span><br></div></blockquote></div></body></html>