this post was submitted on 30 Sep 2023
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Can I attach a 10GBase-LR to QSFP-40G-LR4 (CWDM)? (aussie.zone)
submitted 1 year ago* (last edited 1 year ago) by ky56@aussie.zone to c/selfhosted@lemmy.world
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cross-posted from: https://aussie.zone/post/2534398

The 10GBase-LR is 1310nm and the QSFP-40G-LR4 CWDM channels are 1271, 1291, 1311 and 1331 nm. Are the 1310nm and 3rd channel 1311nm technically compatible?

I have a 10Gb and (will eventually have) a 40Gb switch both fitted with basic LR (Q)SFP+ transceivers and want to know if I can directly connect them or will I have to use an adapter to fit an SFP+ in an QSFP+ port?

I'm looking at using the XQX2502 QSFP+.

EDIT: The goal of this exercise is I’m trying to work out if I can make an easily interoperable system where a singlemode fiber wall jack fed from a 40G switch can act as a both a 10G or 40G port as needed.

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[–] Eideen@lemmy.world 6 points 1 year ago (1 children)

No the 10LR have a to wide of a bandwidth, so it will interference the other channels.

If the switch support QSPF breakout, a CWDM-10LR may work.

but it cheaper to by

Then to by 1 CWDM 10G.

[–] ky56@aussie.zone 1 points 1 year ago* (last edited 1 year ago) (1 children)

Yes I am aware of that solution. I should have clarified the goal of the exercise. I’m trying to work out if I can make an easily interoperable system where a singlemode fiber wall jack fed from a 40G switch can act as a both a 10G or 40G port as needed depending on what ethernet card the client is using. I am using singlemode as I want to avoid using MTP multimode cable seeing how much more expensive it is than simple lc-lc singlemode.

[–] Eideen@lemmy.world 5 points 1 year ago

I understand the use case.

I stand by it is easy to get right, if optic is changing for the difference use cases.

QSPF is not build to be hotplug in that manner.

[–] majestictechie@lemmy.fosshost.com 4 points 1 year ago

Image

[–] noride@lemm.ee 2 points 1 year ago (1 children)

QSFP and SFP are different physical connectors, they are not interoperable.

[–] Eideen@lemmy.world 3 points 1 year ago

Correct, they are different physical connectors. But they are interoperable, if the switch support it.

There is QSPF breakout to 4x SFP. There is 40G QSFP+ to 10G SFP+ Adapter Converter Module

[–] 970372@sh.itjust.works 1 points 1 year ago

This might be compatible. As the pass band should be wide enough to be in the same range stil.

[–] jake_jake_jake_@lemmy.world 1 points 1 year ago

i looked at the cross-post, do you have the spec sheets for transceivers? do you have any sort of filter / mux panel.