Optical cables difference

Hi Mates,

Is there anyone with Fiber experience?

What’s the difference between these 2 optical cables:

  • Optical cable parts, DLC/UPC, DLC/UPC, single Mode 30m, 2 cores, 0.03m/0.34m
  • Optical cable parts, DLC/UPC, 2FC/UPC, single Mode 20m, 2 cores, 0.03m/0.8m