Answers in-line below. Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232
Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net ----- Original Message ----- > From: "Colton Conor" <colton.co...@gmail.com> > To: "nanog list" <nanog@nanog.org> > Sent: Monday, June 19, 2017 2:26:55 PM > Subject: DWDM Mux/Demux using 40G Optics > We are building a 40G metro ring using 40-Gigabit Ethernet QSFP+ > Transceivers. Specifically, we are using Juniper JNP-QSFP-40G-LR4. This is > a QSFP+ Transceiver with a LC duplex head. We only have one pair of single > mode dark fibers around the ring. Our distance between nodes around the > ring are all less than 10KM, so we can use standard optics. > > We go out of one JNP-QSFP-40G-LR4 and into another JNP-QSFP-40G-LR4. There > are no passive muxes involved. This is working great for 40G. > > My understanding is a JNP-QSFP-40G-LR4 is really a transceiver with a CWDM > mux built into it. The spec sheet shows it sends 4 10G channels: > > https://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/specifications/optical-interface-qfx-support.html > > Lane wavelength > Lane 0–1264.5 nm through 1277.5 nm > Lane 1–1284.5 nm through 1297.5 nm > Lane 2–1304.5 nm through 1317.5 nm > Lane 3–1324.5 nm through 1337.5 nm > > YES this is correct and goes for pretty much all of the SMF QSFP+ 40g Optics. (they utilize 4 cwdm channels) > This setup is working fine, but now we want to do more than 40G around the > ring. To my knowledge there are no other 40G QSFP+ transceivers that use > four other channel/lanes than the ones already being used, so they only way > to go higher than 40G is to stack 10G or 100G channels ontop of the fiber > pair using a passive mux. > Typically you would stack 40G + 10g Channels or 100G+10g Channels (100g optics would be using 4 channels as well). > 100G is too expensive for the time being, so we are looking to add 10G > channels to a ring that already have one 40G channel using the QSFP+. Yep, that would be the cost effective way to do it. > > I was reading this tutorial, and it mentions "there is a 1310 nm port > integrated in a 40 channels DWDM Mux/Demux system. The 1310nm added port is > a Wide Band Optic port (WBO) added to other specific DWDM wavelengths in a > module. When we run out of all channels in a DWDM Mux/Demux system, we can > add the extra optics via this 1310nm port." > http://www.fs.com/upgrade-to-500g-with-40ch-dwdm-mux-demux-system-aid-493.html > > What I can't seem to understand is they are mentioning that this 1310 port > can pass QSFP+ signals, so it sounds like its really a 1270nm through > 1330nm port? Is this what they mean by Wide Band Optic port (WBO)? > Yes that would be correct, 1310nm is simple nomenclature when used with 40g/100g QSFP+ SMF optics > We don't need 40 10G channels plus a 40G for a total of 440G. More than > likely we are looking at a 8 channel mux/demux, and 1 40G port for a total > of 120G. > > I don't care if we do CWDM vs DWDM, but I assume it will be hard to find a > CWDM mux that has one LC dupluex input for 1270nm through 1330nm channels? If you look at the CWDM Muxes (8 or 9 channel) you will notice a common configuration of Upgrade Port (expansion port) + 1450 or 1470 to 1610nm in the DWDM muxes you will see them listed as # of Port + 1310 pass thru channel. These are exactly what you are looking for ..... :) > > Maybe I should just ditch the 40G QSFP+ optics and use all 10G optics, but > the switches I am using have 48 10G SFP+ ports and 6 QSFP+ ports built in. > I know there are 40G breakout cables, but the whole point of 40G is to > aggregate VLAN/circuits. > > Has anyone done this before? Am in the process of lighting a number of locations in this manner...
