Refer to the output from a CX 6100 switch: What is the correct detail that can be observed from the output above?

Question

Exhibit

Options

• AThe dBm values for Tx are too high and affect Rx signals.
• BThe dBm values for Rx are too low, indicating that the link is down.
• CThe dBm values for Rx are within acceptable values, and the link is up.
• DThe dbm values for T are too far away from 0, and the link is down.

• A
  12% (6)
• B
  78% (38)
• C
  6% (3)
• D
  4% (2)

Explanation

On fiber optic links, the Rx (receive) power level must fall within the transceiver's sensitivity range - if it's too low (excessively negative dBm), the receiver cannot detect the signal, causing the link to go down. Option B is correct because the output shows Rx dBm values below the acceptable threshold, which directly explains why the link is not operational.

Why the distractors are wrong:

• A is incorrect because high Tx values alone don't inherently "affect" Rx signals in the way described - Tx power being strong is generally not the problem here.
• C is the opposite of what the output shows; if Rx values were within acceptable range, the link would be up, not down.
• D uses incorrect terminology ("T" instead of "Tx", lowercase "dbm") and the logic is flawed - dBm values aren't evaluated by proximity to 0, but by whether they fall within the transceiver's specified operating range.

Memory tip: Think "Rx too low = link won't go" - fiber links fail when received signal strength drops below the minimum sensitivity of the SFP/transceiver, regardless of how strong the Tx side is sending.

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