However, if you just need to use 10g of the 40g port, you can do it much cheaper and easier with just this part:

https://www.fs.com/products/72582.html

we will test to be sure this appears as one port of a breakout randy

On Wed, Jan 8, 2020 at 2:20 PM Luke Guillory <lguillory@reservetele.com> wrote:

You'd need something like this, which you can jumper over to the 10G port.

https://www.fs.com/products/37016.html

Cable to break it out.

https://www.fs.com/products/68048.html

I believe that these (and the AOC option) require that the switch understand / supports splitting the 40G interface into 4x10s -- now, presumably Randy can figure that out for the Arcus, but it's disappointing how many devices *dont* support this. Actually, while we are discussing this, does anyone know of a current NIC which has 4 or more 10G ports? The Mellanox switches can channelize their ports (and they sell a cable for this), but the NICs don't support it... W

Luke

Ns

-----Original Message----- From: NANOG <nanog-bounces@nanog.org> On Behalf Of Randy Bush Sent: Wednesday, January 08, 2020 1:10 PM To: North American Network Operators' Group <nanog@nanog.org> Subject: breakout

*External Email: Use Caution*

i am not a fiber/sfp/... geek, so clue bat please

on my left, i have a delta 9020SL running arcos, female 40g qsfp

on my right, i have incoming 10g 1310nm single mode from the seattle internet exchange. it is currently into a redstone 10g sfp

NAME VALUE --------------------------------- SwPort 1 Status PRESENT Valid True Vendor FiberStore Model SFP-10GLR-31 Serial-Number G1804021292 Type SFP Module-Type 10G_BASE_SX Media-Type FIBER Module-Capability F_10G Length 255 Length-Description

which i am swapping out for the delta 9020

so i am look at something such as https://www.fs.com/products/30900.html except i do not understand active/passive, AOC1M, etc

thanks in advance

randy

-- I don't think the execution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants. ---maf

I doubt it applies to Randy's 48 port switch (and maybe in general), but for posterity: be advised that the QSFP28 to SFP+ adapter is physically taller than a standard QSFP28 optic, outside of the device. Inside is still to spec of course. Sort of like how RJ45 SFPs are slightly taller than fiber SFPs, so some switches can't support two rows of them, e.g. Juniper's QFX5100. They CAN fit, but it requires a little persuasion that most people won't be comfortable with. -Matt On Wed, Jan 8, 2020, 12:37 Randy Bush <randy@psg.com> wrote:

...

I believe that these (and the AOC option) require that the switch understand / supports splitting the 40G interface into 4x10s

arcos does what i expect, sub units

as i have no problem wasting ports on the delta box (there are 48 and i only need two :) i think ben's

https://www.fs.com/products/72582.html

looks to be the simplest solution.

thank you all!

randy

This is another good way to go, make sure you have a single mode handoff from the IX (you should, but double check this, orange fiber and yellow fiber are very different physically in size and generally not compatible. -Ben Cannon CEO 6x7 Networks & 6x7 Telecom, LLC ben@6by7.net <mailto:ben@6by7.net>

On Jan 8, 2020, at 11:20 AM, Matt Erculiani <merculiani@gmail.com> wrote:

I think you're looking for an MTP breakout cable, rather than a QSFP28 breakout.

The MTP breakout requires separate optics, whereas the active breakout can plug directly into a device's SFP+ ports.

Something like...

https://www.fs.com/products/24422.html <https://www.fs.com/products/24422.html> And https://www.fs.com/products/41426.html <https://www.fs.com/products/41426.html>

You'll also need to tell your device to break out it's 40 g into the component 10g channels. Then they'll each get a distinct port number. (Usually just a number appended to the parent port)

-Matt

On Wed, Jan 8, 2020, 12:10 Randy Bush <randy@psg.com <mailto:randy@psg.com>> wrote: i am not a fiber/sfp/... geek, so clue bat please

on my left, i have a delta 9020SL running arcos, female 40g qsfp

on my right, i have incoming 10g 1310nm single mode from the seattle internet exchange. it is currently into a redstone 10g sfp

NAME VALUE --------------------------------- SwPort 1 Status PRESENT Valid True Vendor FiberStore Model SFP-10GLR-31 Serial-Number G1804021292 Type SFP Module-Type 10G_BASE_SX Media-Type FIBER Module-Capability F_10G Length 255 Length-Description

which i am swapping out for the delta 9020

so i am look at something such as https://www.fs.com/products/30900.html <https://www.fs.com/products/30900.html> except i do not understand active/passive, AOC1M, etc

thanks in advance

randy

Hi, yep, that's the right way to work cleanly, just add a «special patch panel» instead of dealing with plenty of additional wires. We use such method to do 10GE with routers modules full of QSFP+ configured as 4x10. On our side we went for a modular Huber+Suhner solution, 1 U with a maximum of 18 MTP (from 18 QSFP+) internally wired to 72 LC duplex. I searched a bit before choosing this, it looks like this was (still is ?) the denser solution. They are divided in modules of 3 MTP to 12 LC-duplex (wired accordingly to the QSFP+ / MTP8 pairing): https://ecatalog.hubersuhner.com/product/E-Catalog/Fiber-optics/Fiber-manage... <https://ecatalog.hubersuhner.com/product/E-Catalog/Fiber-optics/Fiber-management-systems/Modules/ITD-12-LCUD-03-08CF-SM-NS-00WW> They go inside some various chassis, we use their 1U one than can host 6 of such modules: https://ecatalog.hubersuhner.com/product/E-Catalog/Fiber-optics/Fiber-manage... <https://ecatalog.hubersuhner.com/product/E-Catalog/Fiber-optics/Fiber-management-systems/Chassis/IANOS-STD-CHASSIS-FLX-1U-2G-T4> We use them since 2017: https://twitter.com/OBenghozi/status/885528976801837057 <https://twitter.com/OBenghozi/status/885528976801837057> regards, Olivier

Le 9 janv. 2020 à 17:29, Baldur Norddahl <baldur.norddahl@gmail.com> a écrit :

Hello

In my opinion the "nice" way of breaking out QSFP into 10G is something like this:

https://www.fs.com/de-en/products/43552.html <https://www.fs.com/de-en/products/43552.html>

40GBASE-PLR4 to 10GBASE-LR Breakout Panel 1U Rack-Mount, 24x LC Quad, 12x MTP Elite (0.35dB IL), Single Mode

You connect your QSFP module using a MTP cable to the breakout panel. That particular panel will accept up to 12x MTP connections (12 QSFP ports) which equals 48x 10G LR 10 km single mode.

If you don't need quite that many breakouts this solution is also available in smaller cassettes:

https://www.fs.com/de-en/products/68401.html <https://www.fs.com/de-en/products/68401.html>

MTP-8 to 4x LC Duplex, 8 Fibres OS2 Single Mode FHD MTP Cassette

That will terminate one MTP cable (1 QSFP port).

I prefer the panel solution over breakout cables because the later assumes all the connections are going the same place. Also the panel solution will appear as an extension of the switch or router. Mentally it is simply extra ports on a separate panel.

Regards,

Baldur