Monday, September 24, 2018

Singlemode or Multimode - Top of rack to server

I've read multiple times to always use SMF over MMF. Seems like a blanket rule which does make sense. However, I also see references to the cable being in the ground a lot of the time in these posts.

If I have a single rack in a colo facility with 2x 48 port 10gb switches that need to connect to say 20 servers should I be going SMF or MMF? SMF optics are £28 compared to £13 for MMF. The overall price increase isn't that much because I only have one rack, it would be significant though if I had 100 racks.

The cables would probably never be over 3m.

What's standard protocol for top of rack to server at 10gb? SMF/MMF/DAC?

Thanks!



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