FOA CFOS/T Deluxe — Certified Fiber Optic Specialist, Testing

The guide, the questions, and the hub. Deluxe includes everything in the Study Guide tier, plus the full 500-question practice bank, the six cheat sheets, and a license key for the LoadCairn online practice hub.

The real exam: FOA CFOS/T (Certified Fiber Optic Specialist, Testing), a skills-based specialist certification. The prerequisite is the FOA CFOT certification, and you must answer at least 70% of the exam questions correctly to pass.

What's inside:

- The complete study guide — 6 chapters covering all of FOA's published CFOS/T topics: test fundamentals (dB/dBm, loss and power budgets, modal launch effects); inspection, cleaning, continuity and fault location; insertion loss testing (the OLTS, reference cables, the three reference methods); OTDR testing (setup, trace reading, gainers, ghosts, bidirectional averaging); return loss, dispersion and fiber characterization; and standards, calibration, documentation and troubleshooting

- 500 original practice questions with the correct answer and a plain-language explanation for every question, organised by domain so you can find your weak areas before you test mixed — including worked calculation questions throughout: dB/dBm conversions, complete loss-budget builds, OTDR distance and splice-loss math, return-loss combining, and dispersion and PMD arithmetic

- Cheat sheets for all six chapters — the condensed must-know tables and field reminders (budget allowances, reference-method rules, OTDR event signatures, polish reflectance values, dispersion figures) for final-days review

- Online practice hub access (license key included) — the same 500-question bank in Timed mode (100 questions in 120 minutes — this is our own practice format: FOA does not publish a question count or a numeric time limit for the CFOS/T exam), Practice mode by domain, and Review mode that re-tests only the questions you missed

A note on the question counts: FOA does not publish percentage weights for this exam's topics. The per-domain counts were derived from the number of official syllabus topics (the CFOS/T Knowledge KSAs, FOA's specialist training requirements, and FOA's curriculum elaboration for the Testing specialty) listed under each domain — 48 topics in total. They are a study distribution, not FOA's weighting, and a domain with fewer questions is not a domain that matters less on the exam.

Files included (3):

• cfost-study-guide.pdf — the complete 6-chapter guide (96 pages)
• cfost-practice-bank.pdf — all 500 questions with answers and explanations, by domain (173 pages)
• cfost-cheat-sheets.pdf — six cheat sheets, one per chapter (32 pages)

Plus: hub license key (delivered by Payhip at checkout).

Independent study material. Not affiliated with or endorsed by the FOA.