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: Support@Snappytelecom.net ----- Original Message -----
From: "Colton Conor" <colton.conor@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...
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.ht...
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...