FOA CFOS/FC study plan

Explain the difference between insertion loss and reflectance and state typical acceptance values for single-mode and multimode connectors

Identify the common connector end-face defects (scratches, pits, cracks, embedded debris, epoxy bleed) and describe how each affects loss and backreflection

Perform a dry-clean-then-wet-clean procedure on a connector and describe why lint-free wipes and one-direction strokes matter

Set up a light-source-and-power-meter insertion loss reference (one-jumper and two-jumper methods) and state when each is appropriate

List the pass/fail criteria you would apply to a connector end-face before mating it

Calculate insertion loss in dB from measured power readings using 10*log10(P1/P2) and verify against a worked example

Explain why a reference must be set with the launch jumper in place and how dirty connectors corrupt a reference

Describe absolute versus relative power measurement and when each mode is used on a power meter

Demonstrate how to select the correct wavelength and calibration for a source-meter pair on single-mode and multimode links

Diagnose a negative or impossibly low insertion loss reading and list at least three likely causes

Compare visual fault locator, visible laser source, and OTDR for locating faults and state which faults each can and cannot see

Describe how a VFL reveals bends, breaks, and bad splices through jacket glow and explain its range limitation

Match each test instrument (OLTS, power meter, OTDR, VFL, inspection scope, CD/PMD analyzer) to the measurement it produces

Explain when an OLTS is preferable to an OTDR for tier-1 certification and when tier-2 OTDR testing is required

Describe how to trace a fiber through a patch panel using a VFL or tone source without disrupting live traffic

Explain OTDR dead zones (event and attenuation) and how pulse width, reflectance, and distance range trade off against resolution

Interpret a sample OTDR trace by identifying launch event, splice, connector, bend, and end-of-fiber events

Calculate a link loss budget from component losses, splice count, connector count, and margin, and compare it to the measured loss

Describe how launch and receive fibers shift the first and last connector events out of the dead zone

Explain why ghost reflections appear and how to distinguish a ghost from a real event

Set up an OTDR test with correct range, pulse width, wavelength, index of refraction, and averaging time for a given link length

Explain how splitter loss and split ratios affect PON testing and why a high-loss splitter can hide downstream events

Describe testing a PON from the OLT side versus the ONT side and the role of launch fiber and a filter or port selector

Explain why bi-directional OTDR testing is needed and how to average two directions to remove gainers and false losses

Identify the limits of OTDR testing through a live PON and describe the safe procedure for testing without disrupting service

Define chromatic dispersion and polarization mode dispersion and state which link lengths and bit rates make each a concern

Describe how CD and PMD are measured and what units and typical values look like for single-mode fiber

Explain why multimode fiber characterization includes modal bandwidth and launch condition (encircled flux) and how a wrong launch condition skews loss results

Describe the PON power meter and how it measures upstream and downstream power at 1490 nm, 1550 nm, and 1310 nm simultaneously

Explain how to verify PON power at the ONT against the transceiver's specified receive range

Build a pre-test checklist covering fiber cleanliness, reference setting, wavelength, connector type, and test-standard selection

Describe a systematic troubleshooting sequence for a link that fails insertion loss, starting from inspection and ending at re-termination

Explain sources of measurement uncertainty in insertion loss and OTDR testing, including connector repeatability, source stability, meter accuracy, and reference uncertainty

Calculate a combined uncertainty estimate for an insertion loss measurement from stated component uncertainties

Explain why an OTDR distance measurement depends on index of refraction and how an incorrect value shifts event locations

Review all eleven domains using your own notes and checklists, flagging any domain where you cannot explain a core concept without reference

Re-derive the loss budget and insertion loss formulas from memory and check against your week 4 and week 2 worksheets

Walk through two full end-to-end test scenarios (a short single-mode link and a PON) from inspection to final report

Identify your three weakest domains and write a targeted one-page refresher for each