breakout

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1

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

2

AOC stands for Active Optical Cable, which means it’s really 4 SFP+ and a qsfp plus intermediate fiber all permanently attached. 1M is the length, 1 meter.

This is distinct from DAC (Direct Attach Cable) which is all copper (you don’t want these, fiber for one thing isolates ground/emi)

This cable won’t work for you without an intermediate switch (bad) because they both end in male SFP plug interface.

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

3

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

Luke

Ns

4

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

And
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

5

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.

6

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

7

Old module says "10G_BASE_SX" so that is multimode fiber, which complicates things a bit.

You can see about getting a single-mode handoff instead, or you may need the QSFP-SFP+ adapter (or intermediary switch).

thanks,
-Randy

8

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 :slight_smile: i think ben's

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

looks to be the simplest solution.

thank you all!

randy

9

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

10

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

11

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

Ideally, you should use a "breakout optic" if supported by your device: it plugs into an 40Gbps port and delivers 4x10 Gbps via a MTP/MPO "breakout cable" (MTP/MPO at one end, change from one fat cable to 4 duplex cables somewhere in the middle, 4xLC duplex at the other end).
Optic : https://www.fs.com/fr/products/37016.html (or the "riskier" 1km version : https://www.fs.com/fr/products/48276.html )
Cable : https://www.fs.com/fr/products/80240.html

An "10G into 40G port adapter", as previously suggested could also work.

    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

At some point I can see "10G_BASE_SX" which is a little confusing, since "Base SX" is 1G on multi-mode fiber, in conflict with "SFP-10GLR" which is 10G on single-mode. It really is a 10G-LR, right ?

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

Don't ! DAC (usually copper-based) and AOC are cables with optics at each end (if you can call a "copper optic" an "optic"....). Cable cannot be detached from the *SFP*.

12

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

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

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

13

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-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-management-systems/Chassis/IANOS-STD-CHASSIS-FLX-1U-2G-T4

We use them since 2017: https://twitter.com/OBenghozi/status/885528976801837057

regards,
Olivier