ETA BFT Exam Study Guide (2026)
Everything the ETA Broadband Fiber Technician (BFT) 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. Candidates must hold a current ETA Broadband Fiber Installer (BFI) certification and complete the BFT course with hands-on training at an ETA-approved school, 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 BFT (next level) 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 BFT study notes for “WDM, Wavelength Bands and Light Sources”
Our first full set of comprehensive notes, about 14 minutes of reading: Bands and windows · CWDM and DWDM · WDM in FTTH and PON · Sources and filters, 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. WDM, Wavelength Bands and Light Sources
ETA BFT competency areas 1.0, 6.0 and 7.3 to 7.8: single-mode light sources (VCSEL, FP, DFB), transmission wavelengths and bands, dB and dBm, reflections and index of refraction, CWDM and DWDM bands and spacing, WDM in FTTH, wavelength independent couplers and fiber filters including Bragg gratings. ETA does not publish topic weights.
Key facts
- CWDM (ITU-T G.694.2): 18 channels from 1271 to 1611 nm at 20 nm spacing; cheap uncooled lasers, short to medium reach.
- DWDM (ITU-T G.694.1): frequency grid anchored at 193.1 THz with 100 GHz (about 0.8 nm) or 50 GHz (about 0.4 nm) spacing, mostly in the C-band with amplifiers.
- Bands: O 1260-1360, E 1360-1460, S 1460-1530, C 1530-1565, L 1565-1625, U 1625-1675 nm.
- VCSELs (850 nm multimode), Fabry-Perot (multi-line, 1310 nm) and DFB (single narrow line, 1490/1550/1577 nm and DWDM) are the common sources.
- A WDM coupler separates or combines wavelengths; a wavelength independent coupler (WIC) splits power equally at all wavelengths.
- A fiber Bragg grating reflects one narrow wavelength and passes the rest; it is used in filters and as reflective markers at ONTs for PON monitoring.
- SWDM (shortwave WDM) runs several wavelengths between 850 and 940 nm on OM5 multimode fiber.
Flashcards
Exam tip: Two numbers unlock most WDM questions: CWDM is 20 nm apart, and 100 GHz DWDM is about 0.8 nm apart near 1550 nm.
2. Single-Mode Fiber, Dispersion and Standards
ETA BFT competency areas 2.0 and 4.0: G.652.D, G.655 and G.657 fibers, light-carrying area, cladding and coatings, chromatic, material and waveguide dispersion, optical windows and bands, micro- and macrobending, tensile strength, fibers for premises, MAN and WDM use, and TDM versus FDM versus WDM.
Key facts
- Chromatic dispersion = material dispersion (glass index varies with wavelength) + waveguide dispersion (light split between core and cladding).
- G.652 fiber has zero dispersion near 1310 nm and about 17 ps/(nm x km) at 1550 nm.
- Pulse spread (ps) = dispersion coefficient x source spectral width (nm) x length (km).
- G.655 keeps a small non-zero dispersion across the C-band to limit four-wave mixing in DWDM systems.
- G.657 bend-insensitive fibers are used for drops, MDUs and microducts; they splice to G.652.D.
- Polarization mode dispersion (PMD) matters on long, high-speed links and older fiber.
- TDM shares a channel in time slots, FDM by RF frequency (as in cable TV), and WDM by optical wavelength.
Flashcards
Exam tip: For a dispersion calculation, write the units out: ps/(nm x km) x nm x km leaves ps. The units tell you what to multiply.
3. PON Generations and Coexistence
ETA BFT competency areas 3.0, 4.9, 12.6 to 12.8 and 13.18 to 13.19: PON terms and standards (G.983, G.984, G.987.1, G.9807.1, G.9807.3, G.989.2, IEEE 802.3ah, 802.3av, 802.3cs, SCTE 174), wavelength plans for each generation, RFoG, topologies, and the devices inside OLTs and ONTs, including TDM upstream.
Key facts
- BPON (G.983) and GPON (G.984): 1490 nm down, 1310 nm up, 1550 nm video. GPON runs at about 2.5 Gb/s down and 1.25 Gb/s up.
- XG-PON (G.987.1, 10/2.5 Gb/s) and XGS-PON (G.9807.1, 10/10 Gb/s): about 1577 nm down and 1270 nm up.
- EPON (IEEE 802.3ah) uses 1490/1310 nm; 10G-EPON (802.3av) uses about 1577/1270 nm.
- NG-PON2 (G.989.2) is TWDM: several wavelength pairs, with downstream in the L-band (about 1596 to 1603 nm).
- SuperPON (IEEE 802.3cs, ITU-T G.9807.3) extends reach and split for long-distance PON using multiple wavelengths.
- RFoG (ANSI/SCTE 174) carries cable RF over fiber: 1550 nm forward, 1610 nm return when sharing with PON.
- Downstream is broadcast to every ONT (encrypted); upstream uses TDM, each ONT sending in assigned time slots.
- A coexistence element (WDM) at the central office lets GPON, XGS-PON and video share one ODN.
Flashcards
Exam tip: Build a single table: technology, standard number, downstream nm, upstream nm. Most PON questions are a lookup in that table.
Test yourself on these topics
Take the free 15-question ETA BFT test, then save your results to unlock your Readiness Score and the mistakes bank.
4. Cabling, Installation and Damage Prevention
ETA BFT competency areas 5.0, 10.0 and 11.0: cable structures, jackets, armor and ribbon, TIA-598 colors, sequential marks and helical lay, microducts and coating diameters, static and dynamic loads and bend radius, feeder, distribution and drop cables, pulling, bonding, NEC 770.100 and NESC, premises construction and upgrades, 811 damage prevention, and FDU, FDH, FAT and MST hardware.
Key facts
- Feeder cables run from the central office to the FDH, distribution cables to FATs and MSTs, and drops to each premises.
- Outside plant cable is typically rated 2670 N (600 lbf); drop cable 1335 N (300 lbf).
Flashcards
Exam tip: Damage prevention questions have one answer that never changes: call 811 first, whatever the depth or the crew's confidence.
5. Connectorization and Splicing
ETA BFT competency areas 8.0 and 9.0: connector types, intrinsic and extrinsic losses, reflections, PC, UPC and APC polishes, pigtails, inspection and cleaning, SFF, array, hardened and splice-on connectors, TIA-568 colors, splice preparation, index matching, Telcordia splice specifications, closures, cleaving, protectors, trays, pigtail coatings and ribbon fusion splicing.
Key facts
- Fusion splices: typically under 0.1 dB, non-reflective. Mechanical splices: higher loss with a small reflection from the index gel.
- Mass (ribbon) fusion splices 12 fibers at once after thermal stripping and ribbon cleaving.
Flashcards
Exam tip: If the OTDR shows a spike, the joint is a connector or mechanical splice. Fusion splices never spike.
6. Splitters, Link Budgets and Attenuators
ETA BFT competency areas 7.1, 7.2, 7.9 to 7.12 and 12.1 to 12.5: splitter uses and drawbacks, placement, insertion loss testing, theoretical losses, measured versus theoretical loss, attenuators, link parts, power and loss budgets, receive power and attenuator calculations.
Key facts
- Theoretical split loss is 10 log N: 3, 6, 9, 12 and 15 dB for 1:2 to 1:32. Excess loss = measured minus theoretical.
- Test a splitter by measuring input power and each output leg with a power meter at the operating wavelength, or with an OLTS.
Flashcards
Exam tip: For any budget question, add the losses first, then compare with both ends of the class range. Too much loss and too little both fail.
7. OTDR Analysis and Acceptance Testing
ETA BFT competency areas 13.0 and 14.0: attenuation types, OLTS, 2 kHz modulation, power meters, OTDR pulse settings and event signatures, bends, fiber identifiers, reflections, bidirectional and dual-wavelength tests, PON meters, ghosts, talk sets, VFLs, L.301 maintenance wavelength, splitter testing, Tier 1 and Tier 2 testing, dead zones, loss limits, real-time fault location and documentation.
Key facts
- Pulse width trades resolution for range: short pulses separate close events and shrink dead zones; long pulses reach farther.
- Event dead zone: minimum spacing to see two reflective events; attenuation dead zone: distance until loss can be measured again.
Flashcards
Exam tip: When a question offers 'use a longer pulse' and 'use a shorter pulse', ask what the problem is: reaching far (longer) or separating close events (shorter).
8. Safety and ONT Power
ETA BFT competency area 15.0: CDRH laser classifications, Safety Data Sheets for OSP products, eye, skin and lung safety and fiber disposal, confined space operations, and uninterruptible power supplies at ONTs.
Key facts
- Laser products are classed by CDRH (FDA) and IEC; higher-power sources such as amplified DWDM links may exceed Class 1.
- Never look into fibers; confirm dark fibers with a power meter and inspect with a video probe.
Flashcards
Exam tip: Safety answers favour isolating and testing first. If an option skips a check to save time, it is wrong.
How to pass
- BFT adds WDM and next-generation PON to the BFI syllabus. Learn the wavelength plans for GPON, XG-PON, XGS-PON, 10G-EPON, NG-PON2 and RFoG, and how they share one fiber.
- Expect calculations: DWDM spacing in nm, chromatic dispersion in ps, splitter excess loss, bidirectional averages and whether a design fits a PON optics class.
- ETA's BFT list names standards by number (G.983, G.984, G.987.1, G.9807.1, G.989.2, IEEE 802.3ah, 802.3av, 802.3cs, SCTE 174). Match each number to the technology.
- 75 questions in 2 hours is 96 seconds each and you need 75%. Review the BFI fundamentals too: ETA says much of the primary content comes from BFI.
Frequently asked questions
How long should I study for the ETA BFT 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 BFT 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. candidates must hold a current eta broadband fiber installer (bfi) certification and complete the bft course with hands-on training at an eta-approved school, 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 BFT 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 wdm, wavelength bands and light sources, single-mode fiber, dispersion and standards, pon generations and coexistence, cabling, installation and damage prevention, connectorization and splicing, splitters, link budgets and attenuators, otdr analysis and acceptance testing, safety and ont power. Use the free practice test to see which ones you need most.
The premium ETA BFT study path
Premium ETA BFT 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
- 1WDM, Wavelength Bands and Light Sources8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Notes free with an account
- 2Single-Mode Fiber, Dispersion and Standards8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 3PON Generations and Coexistence8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 4Cabling, Installation and Damage Prevention8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 5Connectorization and Splicing7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 6Splitters, Link Budgets and Attenuators7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 7OTDR Analysis and Acceptance Testing7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 8Safety and ONT Power7 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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- 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
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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.