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.
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.
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QSFP and SFP are different physical connectors, they are not interoperable.
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
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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.
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.
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.
This might be compatible. As the pass band should be wide enough to be in the same range stil.