Selfhosted

38768 readers

373 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.
No spam posting.
Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.
Don't duplicate the full text of your blog or github here. Just post the link for folks to click.
Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).
No trolling.

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 1 year ago

MODERATORS

[email protected]

Can I attach a 10GBase-LR to QSFP-40G-LR4 (CWDM)? (aussie.zone)

submitted 10 months ago* (last edited 10 months ago) by [email protected] to c/[email protected]

8 comments fedilink hide all child comments

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.

top 8 comments

sorted by: hot top controversial new old

[–] [email protected] 6 points 10 months 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.

[–] [email protected] 1 points 10 months ago* (last edited 10 months 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.

[–] [email protected] 5 points 10 months 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.

[–] [email protected] 4 points 10 months ago

Image

[–] [email protected] 2 points 10 months ago (1 children)

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

[–] [email protected] 3 points 10 months 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 1 points 10 months ago

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

[–] [email protected] 1 points 10 months ago

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