ETA BFI Exam Study Guide (2026)
Everything the ETA Broadband Fiber Installer (BFI) tests, topic by topic: what each section covers, the facts that come up most, and how to study it. Pair it with the free 15-question practice test.
The exam at a glance
| Questions | 75 multiple-choice questions |
|---|---|
| Time | 2 hours |
| Passing score | 75% |
| Format | Closed book; scratch paper and a non-programmable calculator are allowed. ETA requires a broadband fiber installer course with hands-on training at an ETA-approved school before the exam, so this prep covers only the written knowledge exam |
| Certifying body | ETA International (Electronics Technicians Association), accredited by ICAC under ISO/IEC 17024 |
| Test provider | ETA-approved fiber training schools with an ETA Course Approval, which run the required BFI course and hands-on training; the written exam is proctored by an ETA Certification Administrator online (Trapeza) or on paper |
Mind map: the whole exam on one screen
Read the complete ETA BFI study notes for “Light, Wavelengths and Active Devices”
Our first full set of comprehensive notes, about 12 minutes of reading: Wavelengths in FTTx · Light sources and safety classes · dB and dBm · Reflections and receivers, a worked exam example, the traps examiners use and a one-minute recap. Create a free account to read it and see how premium notes work before you decide.
1. Light, Wavelengths and Active Devices
ETA BFI competency areas 1.0 and 6.0: single-mode light sources, transmission wavelengths for FTTH, PON and Active Ethernet, dB and dBm, optical reflections, index of refraction and Fresnel reflection, laser safety classes, source power measurement, photodiodes and attenuators. ETA does not publish topic weights.
Key facts
- Single-mode systems use lasers: Fabry-Perot (FP) for cost-sensitive 1310 nm upstream, DFB for narrow-line 1490, 1550 and 1577 nm downstream and video.
- GPON and EPON: 1490 nm downstream, 1310 nm upstream, 1550 nm RF video overlay. Active Ethernet point-to-point links often use 1310/1490 nm or 1310/1550 nm bidirectional pairs.
- dB = 10 log (P2/P1); dBm is referenced to 1 mW. Subtract dBm readings to find loss.
- Index of refraction n = c / v; fiber is about 1.47. Fresnel reflection occurs at any index change, about 4% at a glass-air face.
- Reflection types include Fresnel reflections at connectors and breaks, and backscatter (Rayleigh), which the OTDR measures.
- Photodiodes (PIN or APD) convert light to current at the receiver; attenuators protect receivers from overload.
- Measure source output with an optical power meter set to the source wavelength, through a known reference jumper.
Flashcards
Exam tip: Write 1490 down, 1310 up, 1550 video at the top of your scratch paper. PON wavelength questions are then quick marks.
2. Single-Mode Fiber Types and FTTx Terms
ETA BFI competency areas 2.0 to 4.0: ITU-T G.652.D, G.655 and G.657 fibers, light-carrying area, cladding, 250 and 200 µm coatings, manufacturing effects, optical windows and bands, micro- and macrobending, fiber tensile strength, and the acronyms used in FTTx and OSP work.
Key facts
- G.652.D: standard low-water-peak single-mode, usable across 1260 to 1625 nm; the default for most OSP and FTTx.
- G.655: non-zero dispersion-shifted fiber for long-haul DWDM in the 1550 nm region.
- G.657: bend-insensitive single-mode, A1 (10 mm), A2 (7.5 mm) and B3 (5 mm) minimum bend radius, for drops and MDUs.
- The cladding (125 µm) keeps light in the core by total internal reflection; coatings are 250 µm or reduced 200 µm.
- Optical bands: O 1260-1360, E 1360-1460, S 1460-1530, C 1530-1565, L 1565-1625, U 1625-1675 nm.
- ODN is the passive optical distribution network between OLT and ONTs; OSP is outside plant.
- FDH (fiber distribution hub), FAT (fiber access terminal) and MST (multiport service terminal) are FTTx field hardware; 'hardened' means sealed for outdoor use without an enclosure.
Flashcards
Exam tip: BFI asks many acronym questions. Group them: standards bodies (ITU, TIA, IEC, ANSI), network ends (OLT, ONT), field hardware (FDH, FAT, MST) and test terms (FOTP, dB, dBm).
3. FTTx Cables and Installation
ETA BFI competency areas 5.0 and 10.0: stranded and central tube cable cross sections, loose tube and tight buffer, strength members and jackets, armored and ribbon cable, TIA-598 colors, sequential marks and helical lay, water blocking, static and dynamic loads and bend radius, feeder, distribution and drop roles, microducts, pulling grips, conduit, NEC 770.100 and NESC.
Key facts
- Stranded loose tube cables wrap tubes around a central strength member; central tube cables put the fibers in one large tube with strength members in the jacket.
- Feeder cables run from the central office to the FDH; distribution cables run from the FDH toward the homes; drops connect each home.
- Drop cables are typically rated 1335 N (300 lbf); outside plant feeder cables 2670 N (600 lbf).
- Dynamic (pulling) bend radius is about 20 times OD; static (installed) is about 10 times OD.
- Helical lay makes fiber length longer than sheath length, so OTDR distances exceed sequential marks.
- Armored cable resists rodents and crushing but is conductive, so it must be bonded and grounded at building entrances.
- NEC covers premises wiring; NESC covers utility aerial and buried plant, including clearances.
- Mid-entry (mid-span access) lets a crew splice into selected fibers without cutting the whole cable.
Flashcards
Exam tip: Read installation questions for the word 'during' or 'after'. During the pull, dynamic limits apply; after, static ones do.
Test yourself on these topics
Take the free 15-question ETA BFI test, then save your results to unlock your Readiness Score and the mistakes bank.
4. Connectors and Endface Care
ETA BFI competency area 7.0: standard connector types, intrinsic and extrinsic loss, finding interconnection loss and reflections, PC, UPC and APC polishes, pigtails, visual inspection, single-mode plug and sleeve cleaning, contamination and ferrule damage, SFF and array connectors, hardened and splice-on connectors and TIA-568 colors.
Key facts
- SC and LC are the common FTTx connectors; MPO array connectors hold 12 or more fibers for high-density links.
- PC is domed; UPC has a finer polish with lower reflectance (about -50 dB); APC is angled 8° for about -65 dB or better.
Flashcards
Exam tip: If cleaning and re-seating don't help, the loss is intrinsic or the endface is damaged. Inspection tells you which.
5. Splicing, Closures and Hardware
ETA BFI competency areas 9.0 and 11.0: intrinsic and extrinsic splice factors, cable preparation, index matching gel, Telcordia GR-20 splice performance, closures, cleaving, splice protectors, trays and color sequence, pigtail and mechanical splices, FDU, FDH, FAT and MST roles, mid-entry routing, hub cable management, building entry, innerduct and drop termination options.
Key facts
- Fusion splices typically lose under 0.1 dB and are non-reflective; mechanical splices use index matching gel, lose more and show a small reflection.
- A good cleave is flat and perpendicular; splicers reject cleaves above their set angle limit, commonly about 1°.
Flashcards
Exam tip: Know the visual difference on an OTDR: fusion splice is a small step with no spike; mechanical splice is a step with a small spike.
6. PON Architecture, Splitters and Power Budgets
ETA BFI competency areas 8.0 and 12.0: splitter uses and drawbacks, splitter locations, theoretical losses for 1:2 to 1:32, measured versus theoretical loss, attenuators, the three parts of a link, power budgets and not-to-exceed loss budgets, receive power, attenuator calculations, MAN and FTTx topologies, and the OLT and ONT.
Key facts
- FTTx PON is point-to-multipoint: one OLT port feeds up to 32 or more ONTs through passive splitters.
- Theoretical split loss = 10 log N: 1:2 is 3 dB, 1:4 is 6 dB, 1:8 is 9 dB, 1:16 is 12 dB and 1:32 is 15 dB; real splitters add excess loss.
Flashcards
Exam tip: For any splitter, every doubling of the split adds 3 dB. You can rebuild the whole table from that one rule.
7. OTDR and Field Testing
ETA BFI competency areas 13.0 and 14.0, the largest part of the outline: attenuation types, OLTS, 2 kHz tone, power meters, OTDR pulse settings and event signatures, bends at closures, fiber identifiers, Fresnel reflections, bidirectional and dual-wavelength tests, PON meters, ghosts, talk sets, VFLs, next-generation PON wavelengths, ITU-T L.301, splitter testing, dead zones, splice and connector loss limits and documentation.
Key facts
- OTDR events: connectors and mechanical splices are reflective (spike plus step); fusion splices and bends are non-reflective steps; splitters show a large step.
- Bidirectional testing averages out gainers and false losses caused by MFD differences; the true loss is the average of both directions.
Flashcards
Exam tip: On any trace question, first decide reflective or non-reflective, loss or no loss. Those two choices narrow the answer to one event type.
8. Safety for Broadband Fiber Work
ETA BFI competency area 15.0: CDRH laser classifications, Safety Data Sheets for OSP products, eye, skin and lung protection and fiber disposal, confined space work, and uninterruptible power at ONTs.
Key facts
- CDRH (FDA) classifies laser products by hazard; Class 1 is safe under normal use, higher classes need more control.
- Never look into a fiber or connector; confirm fibers are dark with a power meter and use video inspection.
Flashcards
Exam tip: ETA safety questions reward the step done before the hazard appears: test, isolate, protect, then work.
How to pass
- PON numbers carry many marks: 1490 nm down, 1310 nm up and 1550 nm video for GPON, and theoretical splitter losses of 3, 6, 9, 12 and 15 dB for 1:2 to 1:32.
- ETA's BFI list names many standards: ITU-T G.652, G.655, G.657, G.671 and L.301, Telcordia GR-20 and GR-765, TIA-568, TIA-598 and TIA-758. Know what each covers rather than memorizing clause text.
- Practise OTDR trace reading: reflective versus non-reflective events, gainers, ghosts, dead zones and splitter steps, and why you test both directions and two wavelengths.
- 75 questions in 2 hours is 96 seconds each and you need 75%. BFI is the prerequisite for BFT, so build the foundations properly now.
Frequently asked questions
How long should I study for the ETA BFI exam?
Most working candidates need 4 to 8 weeks at 45 to 60 minutes a day. Book your exam once your Readiness Score has stayed at 80 or higher for about a week.
Can I take the ETA BFI exam online?
BICSI's v15 handbook describes the RCDD exam at Pearson VUE test centers, not remote proctoring. Format: closed book; scratch paper and a non-programmable calculator are allowed. eta requires a broadband fiber installer course with hands-on training at an eta-approved school before the exam, so this prep covers only the written knowledge exam. Check pearsonvue.com/bicsi for the options in your country.
What score do I need to pass the ETA BFI exam?
75%. The exam has 75 multiple-choice questions and a time limit of 2 hours.
What are the most tested topics?
The outline covers light, wavelengths and active devices, single-mode fiber types and fttx terms, fttx cables and installation, connectors and endface care, splicing, closures and hardware, pon architecture, splitters and power budgets, otdr and field testing, safety for broadband fiber work. Use the free practice test to see which ones you need most.
The premium ETA BFI study path
Premium ETA BFI prep is studied one topic at a time. Each step starts with that topic's key notes and flashcard deck, then its own question sets of 25, so you master one topic before you move to the next. When every topic is strong, the 6 full mock exams show you're ready.
Your step-by-step study path
- 1Light, Wavelengths and Active Devices8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Notes free with an account
- 2Single-Mode Fiber Types and FTTx Terms8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 3FTTx Cables and Installation8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 4Connectors and Endface Care8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 5Splicing, Closures and Hardware7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 6PON Architecture, Splitters and Power Budgets7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 7OTDR and Field Testing7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 8Safety for Broadband Fiber Work7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- Final step: 6 full mock exams75 questions each, timed like test day. Pass them, then book your exam.Premium
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- The RCDD exam: full prep for the v15 blueprint
- 3,000 practice questions + 6 full mock exams per exam
- 800 flashcards + 60 key notes per exam, by topic, plus mind maps
- Spaced repetition + mistakes bank
- Readiness Score & detailed reports
- Video lessons as they release
- Content updates during your access
- 5 bonuses: numbers and formulas sheet, standards atlas, study planner and more
- Pass Guarantee: complete the prep, pass or 100% back
Renews once a year until you cancel. We email you before each renewal. Cancel any time from your account; you keep access until the end of the year you've paid for.
Summarized from BICSI's official candidate information and the rules cited, checked October 2026. Confirm current requirements with ETA International (Electronics Technicians Association), accredited by ICAC under ISO/IEC 17024.