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Cisco 9606R and FEC SFPs

SROD
Level 1
Level 1

I am considering a C9606R for a solution.  When it comes the line cards and interfaces I am looking at the C9600-LC-24C line card.  When looking at the optics compatibility chart https://optics.cisco.com/?dr=7&dr=5&rh=18&npid=2223  I can see the various SFPs that will support 100G at 10Km, which is what I am interested in.  However, there are (2) different types that are available. 

  • QSFP-100G-LR4-S
  • QSFP-100G-LR-S

spec sheet for both devices located here

When I look at the spec sheets for both items,  I can see the following differences:

QSFP-100G-LR4-S:

  • uses 4 lanes to transmit data
  • does not utilize FEC *
  • is significantly more expensive in CCW

QSFP-100G-LR-S

  • Uses a single frequency to transmit data
  • Utilizes FEC*
  • Cheaper

Besides the LR-S using only a single laser, the key difference that I notice is that it supports FEC.  I understand that FEC assist in error correction over long distances/fast speeds.  I understand that both sides of the link will need to use similar protocols (FEC enabled/not enabled) however, I don't understand if FEC is a capability I should want to employ or not.  At first glance my thoughts are to use FEC because of its capability, however, in a recent article I read it mentions the goal to remove FEC from the modules.  So I am not sure which route is best any why.

https://blogs.cisco.com/sp/why-single-lambda-100g-is-just-what-networks-need-in-pluggable-optics 

 

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