Can a QSFP-40G-LR4 Link With a "-S"

[Michael Mertens]

Can I have a 40 Gbps link with a QSFP-40G-LR4 on one end and a QSFP-40G-LR4-S on another? It is my understanding that the -S is less tolerant of humidity/temperature extremes than the standard QSFP.

Thanks

[Reza Sharifi]

I think you should be fine with with -S. 

QSFP-40G-LR4 support OTU (optical Transport Unit) and the only explanation I was able to find is in this link

https://books.google.com/books?id=WpByp4Ip0z8C&pg=PA390&dq=OTU3+data-rate+optical&hl=en&sa=X&ved=0ahUKEwixkL_K_djTAhUBSyYKHTaFAEoQ6AEILDAC#v=onepage&q=OTU3%20data-rate%20optical&f=false

HTH