Map both duplex fiber directions, compare four optical readings and isolate one component at a time before replacing transceivers or changing the path.
Plan an EOL optics replacement with exact lifecycle milestones, installed-fleet identity, successor validation, representative path tests and a controlled spares decision.
Validate deployed optics after a network OS upgrade with cohort-based baselines, release support checks, diagnostics, FEC, traffic tests and rollback gates.
Plan an optical transceiver loopback test without overloading the receiver or creating a network loop, and understand what a passing result does and does not prove.
Separate a dirty fiber connector from a failed transceiver using safe inspection, cleaning, direction-specific power, controlled substitution and saved evidence.
Interpret SFP warning and alarm thresholds for temperature, voltage, bias, TX power and RX power, then decide what evidence to collect and when to act.
