[195016] in North American Network Operators' Group
Re: DWDM Mux/Demux using 40G Optics
daemon@ATHENA.MIT.EDU (Faisal Imtiaz)
Mon Jun 19 15:01:52 2017
X-Original-To: nanog@nanog.org
Date: Mon, 19 Jun 2017 19:01:45 +0000 (GMT)
From: Faisal Imtiaz <faisal@snappytelecom.net>
To: Colton Conor <colton.conor@gmail.com>
In-Reply-To: <CAMDdSzM=ZUL0m4iJnqd1Js8dQsouTUN4=Trk0ckD=JxubUh50Q@mail.gmail.com>
Cc: nanog list <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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 i=
s
> a QSFP+ Transceiver with a LC duplex head. We only have one pair of singl=
e
> mode dark fibers around the ring. Our distance between nodes around the
> ring are all less than 10KM, so we can use standard optics.
>=20
> We go out of one JNP-QSFP-40G-LR4 and into another JNP-QSFP-40G-LR4. Ther=
e
> are no passive muxes involved. This is working great for 40G.
>=20
> My understanding is a JNP-QSFP-40G-LR4 is really a transceiver with a CWD=
M
> mux built into it. The spec sheet shows it sends 4 10G channels:
>=20
> https://www.juniper.net/documentation/en_US/release-independent/junos/top=
ics/reference/specifications/optical-interface-qfx-support.html
>=20
> Lane wavelength
> Lane 0=E2=80=931264.5 nm through 1277.5 nm
> Lane 1=E2=80=931284.5 nm through 1297.5 nm
> Lane 2=E2=80=931304.5 nm through 1317.5 nm
> Lane 3=E2=80=931324.5 nm through 1337.5 nm
>=20
>=20
YES this is correct and goes for pretty much all of the SMF QSFP+ 40g Optic=
s. (they utilize 4 cwdm channels)=20
> This setup is working fine, but now we want to do more than 40G around th=
e
> 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 w=
ay
> to go higher than 40G is to stack 10G or 100G channels ontop of the fiber
> pair using a passive mux.
>=20
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.
>=20
> 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 ca=
n
> add the extra optics via this 1310nm port."
> http://www.fs.com/upgrade-to-500g-with-40ch-dwdm-mux-demux-system-aid-493=
.html
>=20
> What I can't seem to understand is they are mentioning that this 1310 por=
t
> 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)?
>=20
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 tota=
l
> of 120G.
>=20
> 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 channel=
s?
If you look at the CWDM Muxes (8 or 9 channel) you will notice a common co=
nfiguration of
Upgrade Port (expansion port) + 1450 or 1470 to 1610nm=20
in the DWDM muxes you will see them listed as # of Port + 1310 pass th=
ru channel.
These are exactly what you are looking for ..... :)=20
>=20
> Maybe I should just ditch the 40G QSFP+ optics and use all 10G optics, bu=
t
> 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.
>=20
> Has anyone done this before?
Am in the process of lighting a number of locations in this manner...
