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1. Record the TX power of your optic
   1. Either by using DOM or a power meter
2. Subtract the OTDR results (loss in dB)
   
   1. If you don't have OTDR test results, subtract the estimated loss based on the distance
3. Subtract the connector loss (number of patches)
4. Results
   1. Is the result within your optic's receive min -> max? 
      1. If it's above the max RX add the appropriate pad
      2. If it's below the max RX you might need a different optic or 

Example:

1. I'm My optic is transmitting at +1dB1dBm
2. I don't have an OTDR, but the fiber path distance is 27km
   1. Subtract 0.4 dB 25dB loss per kilometer for 1550nm at 27km37km, subtract 109.8dB25dB
3. I'm using two patch cables, one on each side of my fiber span, subtract ~1dB1dB
4. Result: −10−9.8dB25dBm
5. My result of -109.8dB25dBm is within the -8dB to -23dB receive specification 8dBm to -23dBm receiver specifications for the opticI shouldn't need a pad
   
   1. My optic should work, but as always I should check DOM post install to verify