this post was submitted on 30 Sep 2023
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@nx2
For the curious
10G Base LR: It's a type of fiber standard that runs a 10 gigabits. and looks like this
QSFP 40G: It's a DIFFERENT type of fiber standard that runs at 40 gigs and looks like this
I only know the basics of fiber networking but I know that different standards are needed because light refracts differently depending on cable thickness and composition, so standards/variations of the same standard have different maximum length, bandwidth, collision detection, etc.
For example, the type of fiber that you use to connect two offices that are 10 miles apart is going to be very different than the fiber you use to connect your SAN storage to your baremetal ESXI servers.
In essence, OP is asking if he can connect his phone line to the port on the back of the computer, and the answer is "Yes, but it's not that simple, and you probably don't want to do that anyways"
This is the necessary cable. https://www.fs.com/de-en/products/30827.html
You can just connect a normal fiber between a 10G SFP and a 40G QSFP and let the 40G end auto negotiate to 10G. Fanout cables are better for density though.
Does 40G QSFP transponder be able to even communicate with 10G SFP? Do they even have the same encoding? OOK? QPSK?