Which of the following statements correctly describes where power adjustments can be performed?
A.
In bidirectional configurations, ingress power adjustments are performed against the ingress amplifiers, while egress power adjustments are performed against the egress amplifiers.
B.
In bidirectional configurations, both ingress and egress power adjustments are performed against the ingress amplifiers only.
C.
In unidirectional configurations, both ingress and egress power adjustments are performed against the ingress amplifiers only.
D.
When Raman pumps are used, both ingress and egress power adjustments are performed against the Raman pump directly.
In bidirectional configurations, where the same fiber is used to transmit signals in both directions, power adjustments can be performed at both ingress and egress amplifiers. The ingress power adjustments are performed against the ingress amplifiers, which boost the incoming signals from the opposite direction. The egress power adjustments are performed against the egress amplifiers, which boost the outgoing signals from the same direction2. Therefore, the statement A is correct. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical amplifiers, explained by RP; optical amplification
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