[c-nsp] [External] Re: Support for CFP2

[Shawn L]

Thanks -- I was looking at that exact box earlier today and have sent them
a request for more information.

In a perfect world I'd like to keep it as simple as possible, but I also
want to get this project moving and get things turned up, so other options
are greatly appreciated.

Shawn

On Wed, Jan 24, 2024 at 12:57 PM Rob Evans <internetplumber at gmail.com>
wrote:

> ...and I've just re-read that you were looking for what you could use.
>
> There's something like this:
>
> https://www.packetlight.com/products/100g-200g-dwdm-transport/200g-single-wavelength-muxponder
>
> I've no personal experience of it, and there may be other similar
> products on the market, but that looks like it could have a
> 100GBASE-LR4 uplink to your router, and a CFP2-ACO transceiver facing
> the provider.
>
> Rob
>
> On Wed, 24 Jan 2024 at 17:50, Rob Evans <internetplumber at gmail.com> wrote:
> >
> > It sounds as though your provider is suggesting a CFP2-DCO, such as
> > one of these:
> >
> https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/datasheet-c78-743732.html
> >
> > They're giving you a specification that includes the entire C band
> > (4.8THz), but stating that your wavelength must fit within 50GHz,
> > which is a traditional ITU-T channel width for DWDM systems, so they
> > should probably also specify which channel you're going to use.
> >
> > CFP2-DCOs tend to work because they've got the space and power for the
> > DSPs, and it has been difficult to cram that into QSFP28s (coherent
> > optics requires a lot of signal processing). As you've already noted,
> > there are products in the pipeline, but I'm not aware of any that are
> > widely supported yet.  Cisco do seem to suggest there is a QSFP-DD
> > using QPSK for 100G, but I've not looked too closely at it (and note
> > that QSFP-DD is different to QSFP28, having about three times the
> > electrical power available):
> >
> https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/datasheet-c78-744377.html
> >
> > Cheers,
> > Rob
> >
> > On Tue, 23 Jan 2024 at 19:54, Shawn L via cisco-nsp
> > <cisco-nsp at puck.nether.net> wrote:
> > >
> > > Thanks - we don't really understand the intricacies either.  This is
> our
> > > first adventure in this area.
> > >
> > > The distances are quite large (800+ Km).  It's a dark wave service,
> though
> > > we don't have to worry about anything in the middle, just the 2 end
> points.
> > >
> > > I'm told Adva / Adtran will be releasing a ZR+ 0dBm QSFP28 that would
> (or
> > > should) work in Q2 2024, but I'm looking for other options.  I did
> check
> > > out FS.com, but they're telling me the only option they have available
> uses
> > > a 200Gig CFP2 and 2 100gig QSFP28s.
> > >
> > > Any idea where else we might look?  We'd be happy to engage someone to
> help
> > > us design a solution, we're just not sure where to turn.
> > >
> > > Shawn
> > >
> > > On Fri, Jan 19, 2024 at 1:25 PM Hunter Fuller <hf0002 at uah.edu> wrote:
> > >
> > > > I know when we are talking about DWDM my usual expectation these days
> > > > is to use a "0km optic" (aka one that is meant to launch just far
> > > > enough to make it into an amp)... so one of those (from anyone, e.g.
> > > > fs.com, whatever) followed by an amp might be doable? I would advise
> > > > you to contract someone to work that out though (I myself don't even
> > > > fully understand the intricacies).
> > > >
> > > > the point of the 0km optic is that it fits in QSFP+ generally. It's a
> > > > lot to ask, to get a precisely tuned DWDM wave coming out of a lil
> > > > QSFP+ at ZR levels.
> > > >
> > > > The other option of course being to send it LR and then use a
> > > > transponder closer to the DWDM gear, as Nick suggested.
> > > >
> > > > --
> > > > Hunter Fuller (they)
> > > > Router Jockey
> > > > VBH M-1C
> > > > +1 256 824 5331
> > > >
> > > > Office of Information Technology
> > > > The University of Alabama in Huntsville
> > > > Network Engineering
> > > >
> > > > On Fri, Jan 19, 2024 at 9:07 AM Nick Hilliard via cisco-nsp
> > > > <cisco-nsp at puck.nether.net> wrote:
> > > > >
> > > > > Shawn L via cisco-nsp wrote on 19/01/2024 14:58:
> > > > > > The pluggable optic must be DWDM 1530 to 1563 nm with QPSK
> modulation
> > > > that
> > > > > > fits 50Ghz (~31 to 35Gbaud) and a launch power of ZR+ 0dBm. The
> > > > customer
> > > > > > channel should have Rx: Max <-10 dBm/Ch and Tx: Min: >–5 dBm/Ch
> to
> > > > Max: <+
> > > > > > 6.5dBm/Ch in order to meet the GOSNR margin of 2.5dBm or more.
> > > > >
> > > > > right, so DWDM alien wave requirement then. That's very
> non-portable and
> > > > > kit specific.
> > > > >
> > > > > Depending on the application, you might be better off ditching the
> > > > > requirements that they're imposing and simply using 100G
> transponders
> > > > > (i.e. 100G as a service).  Or something like the smartoptics open
> line
> > > > > system with PAM4 QSFP28 transceivers.
> > > > >
> > > > > It really depends on what's between you and the other end.  D/F has
> > > > > simple options open for single 100G. If you're connecting into
> something
> > > > > more complicated, it can get messy and expensive.
> > > > >
> > > > > Nick
> > > > > _______________________________________________
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