The performance indicators of the OTN circuit board focus on the input optical power and bit error rate. Abnormal optical power may cause bit errors. If the input optical power is too high, you can…

Question

Options

• ATrue
• BFalse

• A
  75% (39)
• B
  25% (13)

Explanation

Option A is correct because OTN (Optical Transport Network) circuit boards do indeed use input optical power and bit error rate (BER) as key performance indicators, and these two metrics are directly linked - excessively high input optical power can saturate or overdrive the optical receiver, causing signal distortion and elevated bit errors. Adding an optical attenuator to the IN (input) port is the standard, recommended corrective action to bring the received power level within the receiver's acceptable dynamic range. Option B is wrong simply because the statement is factually accurate: this describes well-established OTN troubleshooting and maintenance practice, not a misconception.

Memory tip: Think of it like adjusting the volume on a speaker - if the input signal is too loud (high optical power), it distorts (causes bit errors), and you turn it down (add attenuation at the IN port). Power in → errors out → attenuate the input.

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