Seeing that it seems I’m misunderstanding things, so I went grab a meter and checked what was leaving. Both of the 100g SFPs were only outputting on 1310, while the 40g showed each of the 4 lanes. 100GBASE-LR4 QSFP28 Transceiver Module (SMF, 1310nm, 10km, LC, DOM) Optical Components DML 1310nm Juniper 100GBASE-ER4, Showing 1310 as the only color leaving. Parameter 100GBASE-ER4 Optical interface Single-mode Standard IEEE 802.3ba-2010 Maximum distance SMF cable, 40 km (24.9 miles) Transmitter wavelength per lane 1294.53 through 1296.59 nm 1299.02 through 1301.09 nm 1303.54 through 1305.63 nm 1308.09 through 1310.19 nm 40GBASE-LR4 Compatible 40GBASE-LR4 QSFP+ Transceiver Module (SMF, 1310nm, 10km, LC, DOM) Optical Components DFB CWDM [cid:image001.jpg@01D407E0.78FB4970] From: Hunter Fuller [mailto:hf0002+nanog@uah.edu] Sent: Tuesday, June 19, 2018 2:28 PM To: Luke Guillory Cc: NANOG Subject: Re: Tunable QSFP Optics On Tue, Jun 19, 2018 at 11:53 AM Luke Guillory <lguillory@reservetele.com<mailto:lguillory@reservetele.com>> wrote: They still leave the transceiver as a single 1310, the lanes color isn't ever expose since the mux takes place within the transceiver. When I looked into this for 40g and 100g I found no way to passively do it. Luke, Can you link a document that corroborates this? I can only find ones that show it as 4 separate lanes and 4 separate colors, visible on the actual output. Example: https://www.nanog.org/meetings/nanog44/presentations/Monday/Hankins_100gbe_u... slide 11 This is also what I've observed anecdotally, but there could be other explanations, I am admittedly not an expert. -- -- Hunter Fuller Network Engineer VBH Annex B-5 +1 256 824 5331<tel:(256)%20824-5331> Office of Information Technology The University of Alabama in Huntsville Systems and Infrastructure Luke Guillory Vice President – Technology and Innovation [cid:imagee0a454.JPG@9ab64be1.4fabdd45] <http://www.rtconline.com> Tel: 985.536.1212 Fax: 985.536.0300 Email: lguillory@reservetele.com Web: www.rtconline.com Reserve Telecommunications 100 RTC Dr Reserve, LA 70084 Disclaimer: The information transmitted, including attachments, is intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material which should not disseminate, distribute or be copied. Please notify Luke Guillory immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. Luke Guillory therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission.