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SCTE · Last updated November 2026

SCTE Broadband Fiber Installer (BFI): free practice test

SCTE's BFI certification covers installing, verifying and troubleshooting fiber-to-the-home service, from PON and RFoG components to splicing, connectors, power budgets and OTDR work. The online exam has 50 questions in 2 hours with a 76% pass mark across six topic areas, and the credential is valid for 3 years. SCTE says it builds on BPI and BPT knowledge, and its six-course BFI curriculum is the recommended preparation.

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About the SCTE BFI exam

SCTE's BFI certification covers installing, verifying and troubleshooting fiber-to-the-home service, from PON and RFoG components to splicing, connectors, power budgets and OTDR work. The online exam has 50 questions in 2 hours with a 76% pass mark across six topic areas, and the credential is valid for 3 years. SCTE says it builds on BPI and BPT knowledge, and its six-course BFI curriculum is the recommended preparation.

What's on the exam

SCTE BFI
Optical Network Technologies and Components
7 key facts
Fiber Optic Theory
7 key facts
Fiber Installation
7 key facts
Troubleshooting and Maintenance
7 key facts
Standards
6 key facts
Safety
6 key facts

Each branch is a topic in the official outline. Members see every key fact on the full mind map. Read the free study guide →

How to pass the SCTE BFI exam

  • SCTE lists six topic areas: optical network technologies and components, fiber optic theory, fiber installation, troubleshooting and maintenance, standards and safety. Give every one study time, because the public page doesn't show how many questions each carries.
  • Power budgets are open-book arithmetic: launch power minus fiber, splitter, splice and connector losses. Know typical splitter losses (about 3.5 dB per 1:2 stage, 17 to 18 dB for 1:32) so you can check your answer is sensible.
  • SCTE's BFI curriculum includes separate courses on EPON, GPON and RF over Glass. Learn each one's wavelengths and what sits at the home end (ONT or R-ONU).
  • Inspect before you connect: dirty connectors cause most low-power faults in FTTH. Expect questions on endface inspection, cleaning order and APC versus UPC.

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Create a free account after the test: your score by topic, a mistakes bank, the complete study notes for the first topic, flashcards and the RCDD Numbers & Formulas Sheet.

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What's in the premium SCTE BFI prep

Premium SCTE 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.

3,000practice questions, every answer explained
6full-length mock exams, 50 questions each, timed
800flashcards with spaced repetition, sorted by topic
60comprehensive key notes across 6 topics

Your step-by-step study path

  1. 1
    Optical Network Technologies and Components10 key notes, 135 flashcards, then 500 practice questions in 20 sets of 25
    Notes free with an account
  2. 2
    Fiber Optic Theory10 key notes, 135 flashcards, then 500 practice questions in 20 sets of 25
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  3. 3
    Fiber Installation10 key notes, 135 flashcards, then 500 practice questions in 20 sets of 25
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  4. 4
    Troubleshooting and Maintenance10 key notes, 135 flashcards, then 500 practice questions in 20 sets of 25
    Premium
  5. 5
    Standards10 key notes, 130 flashcards, then 500 practice questions in 20 sets of 25
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  6. 6
    Safety10 key notes, 130 flashcards, then 500 practice questions in 20 sets of 25
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  7. Final step: 6 full mock exams50 questions each, timed like test day. Pass them, then book your exam.
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Free with an account

Read the complete SCTE BFI study notes for “Optical Network Technologies and Components”

Our first full set of comprehensive notes, about 15 minutes of reading: PON building blocks · PON systems and wavelengths · RF over Glass (RFoG) · Power budgets, 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.

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Study tools included

3,000 practice questions

3,000 exam-style questions per exam, organized topic by topic in sets of 25. Every answer explained, with the rule it comes from.

6 full mock exams

6 full-length timed mock exams per exam, with real question counts and time limits, so test day feels like practice day.

Exam Readiness Score

One 0 to 100 number that tells you when you're ready to book. Reach 80 and you're covered by our Pass Guarantee.

800 flashcards + spaced repetition

800 flashcards per exam, in a deck for each topic, that come back right before you'd forget them. Five minutes a day keeps every number fresh.

60 comprehensive key notes

60 key notes per exam, split across its topics and each explained in full: the concepts, worked exam examples, the traps examiners use and a quick recap. Your first set is free with an account.

Mind maps

See the whole exam on one screen: every topic and the facts under it.

Sample questions with answers

These are the questions in the free test above, with answers. Try the test first. You'll learn more by getting some wrong.

1. An operator adds XGS-PON to an existing GPON network and wants both to share the same feeder fiber and splitters. Which wavelengths does XGS-PON use so the two can coexist?
Answer: 1577 nm downstream and 1270 nm upstream. XGS-PON (ITU-T G.9807.1) uses 1577 nm down and 1270 nm up, which sit clear of GPON's 1490/1310 nm and the 1550 nm video band. A coexistence element (WDM) at the OLT combines them onto one fiber. 850 nm is a multimode wavelength and is not used in PON.
2. An OLT port launches +3.0 dBm. The path has 12 km of fiber at 0.35 dB/km, a 1:32 splitter with 17.5 dB of loss and 1.5 dB of total connector and splice loss. What power should reach the ONT?
Answer: -20.2 dBm. Fiber loss is 12 × 0.35 = 4.2 dB, so total loss is 4.2 + 17.5 + 1.5 = 23.2 dB, and 3.0 − 23.2 = −20.2 dBm. Leaving out the connectors gives −18.7 dBm; doubling the fiber loss gives −24.4 dBm. The splitter is by far the biggest loss in a PON budget.
3. In an RFoG system (ANSI/SCTE 174) designed to coexist with GPON, what does the R-ONU at the customer's home do?
Answer: Turns 1550 nm light into coax RF, and upstream RF into light. RFoG keeps DOCSIS: the R-ONU turns the 1550 nm downstream into RF for the cable modem and set-tops, and turns their upstream RF into light, commonly at 1610 nm to stay clear of GPON's 1310 nm. The CMTS stays in the headend, and the passive splitter sits in the field.
4. Why can single-mode fiber carry signals over far longer FTTH distances than multimode fiber at high data rates?
Answer: Its small core carries one mode, removing modal dispersion. A single-mode core of about 9 µm carries only one mode of light, so there is no modal dispersion spreading the pulses, and attenuation at 1310 and 1550 nm is very low. Multimode cores are 50 or 62.5 µm. Light stays in any fiber because the core index is higher than the cladding, not lower.
5. A single-mode link is tested at 1550 nm: 8 km of fiber at 0.25 dB/km, two fusion splices at 0.05 dB each and two mated connector pairs at 0.3 dB each. What is the expected end-to-end loss?
Answer: 2.7 dB. Fiber: 8 × 0.25 = 2.0 dB. Splices: 2 × 0.05 = 0.1 dB. Connectors: 2 × 0.3 = 0.6 dB. Total 2.7 dB. Leaving out a component class gives 2.1 or 2.6 dB, and using a 1310 nm loss of 0.35 dB/km gives 3.5 dB.
6. An optical power meter at the ONT reads −20 dBm. What is that power in microwatts?
Answer: 10 µW. dBm is referenced to 1 mW, and every −10 dB divides power by 10: −10 dBm is 100 µW and −20 dBm is 10 µW. A GPON class B+ ONT typically works between about −8 and −27 dBm. Don't read −20 dBm as 20 of anything.
7. You pull a 6 mm diameter fiber drop cable through conduit. Using the common rule when the manufacturer's data is not at hand, what is the minimum bend radius while the cable is under pulling tension?
Answer: 120 mm. A common rule of thumb is 20 times the cable diameter under tension and 10 times after installation with no load, so 20 × 6 = 120 mm while pulling. The manufacturer's specification always takes priority. 60 mm is the at-rest value and would be too tight during the pull.
8. You are pulling a fiber drop cable with aramid yarn strength members through a duct. Where should the pulling force be applied?
Answer: To the aramid strength members through a pulling grip. Strength members (aramid yarn or rods) are designed to carry the pulling load, so attach them through a proper grip or swivel and stay under the rated tension. Pulling on the jacket stretches it and pulling on fibers or a connector breaks them. Use lubricant and a breakaway swivel on long pulls.
9. The port you are connecting to at a fiber terminal is an SC connector with a green body. Which connector must the drop cable have?
Answer: SC/APC (green, angled endface). Green marks APC connectors, polished at an 8 degree angle for very low back reflection, which PON and RF video need. Mating an APC with a UPC leaves an air gap and misaligned endfaces, causing high loss and reflection and possibly damage. Blue marks UPC.
10. An OTDR test of a drop shows an event with 0.2 dB of loss at 1310 nm but 1.8 dB at 1550 nm at the same location. What is the most likely cause?
Answer: A tight bend (macrobend) in the cable. Bend loss rises sharply at longer wavelengths because the light is less tightly confined to the core, so a much bigger loss at 1550 nm than at 1310 nm is the classic sign of a macrobend. A bad splice or dirty connector shows similar loss at both wavelengths, and a break ends the trace.
11. A newly installed ONT will not register, and the PON power meter shows −29 dBm at the ONT, about 9 dB below the design value. What should you do first?
Answer: Inspect and clean the connectors in the drop path. Contamination on connector endfaces is the most common cause of unexpected loss. Inspect each connection with a fiber microscope, clean it if needed, and inspect again before reconnecting. Replacing equipment or re-splicing before inspecting wastes time and often leaves the real fault.
12. You must test a drop with an OTDR on a live PON without disrupting other customers on the same splitter. Which OTDR wavelength should be used?
Answer: 1625 or 1650 nm, filtered and outside the PON bands. In-service testing uses an out-of-band wavelength such as 1625 or 1650 nm, with filters at the ONT and OLT so the test light does not interfere with traffic. Testing at 1310 or 1490 nm on a live PON would interfere with service, and 850 nm is for multimode fiber.
13. A fiber drop must run inside narrow molding with several tight corners in a customer's home. Which ITU-T fiber type should be specified?
Answer: G.657.A2 bend-insensitive single-mode fiber. ITU-T G.657 covers bend-insensitive single-mode fiber; the A2 category tolerates bends down to about 7.5 mm radius and is compatible with G.652.D fiber in the network. G.655 is for long-haul DWDM, and G.984 is the GPON system standard, not a fiber type.
14. The work order assigns the customer to fiber 10 in a 12-fiber buffer tube colored to TIA-598. Which fiber color should you splice?
Answer: Violet. The TIA-598 sequence is blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, aqua, so fiber 10 is violet. Yellow is 9, rose 11 and aqua 12. The same 12-color sequence also identifies buffer tubes.
15. While splicing a drop, you cleave several fibers. How should you handle the bare fiber scraps?
Answer: Put them in a labeled, sealed fiber disposal container. Bare glass slivers easily pierce skin and eyes and are hard to find and remove. Pick them up with tape or tweezers, drop them straight into a labeled, sealed disposal container, wear safety glasses, and never eat or drink in the work area.

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SCTE BFI exam FAQ

How many questions are on the SCTE BFI exam?

50 questions, with a time limit of 2 hours; the exam cannot be paused and breaks are not allowed. Format: open book: scte training material, books, printed notes, tables, a calculator and internet resources in the same browser are allowed, but ai tools are banned and the session is recorded. scte does not describe item types, so practice here uses single-best-answer questions.

What is the passing score for SCTE BFI?

76% (38 of 50 correct).

How much does the SCTE BFI exam cost?

US$125 for members and non-members (English exam); the Spanish exam is US$112 for non-members and US$84 for members. Each attempt needs a new fee, and the exam must be taken within one year of purchase. BICSI fees can change without notice, so confirm on bicsi.org before you apply.

Which languages is the SCTE BFI exam offered in?

English and Spanish (Instalador de Fibra de Banda Ancha).

Where do I take the SCTE BFI exam?

Online through the SCTE portal with Proctorio automated remote proctoring (Chrome or Edge browser, webcam, microphone and a government- or company-issued photo ID).

Is this SCTE BFI practice test free?

Yes. The 15-question practice test on this page is free, with an explanation for every answer and no signup. A free account also unlocks the complete study notes for the first topic. The full SCTE BFI prep is Premium at $147 a month for this exam.

What's in the premium SCTE BFI prep?

3,000 practice questions organized topic by topic (Optical Network Technologies and Components: 500; Fiber Optic Theory: 500; Fiber Installation: 500; Troubleshooting and Maintenance: 500; Standards: 500; Safety: 500), 6 full-length timed mock exams of 50 questions, 800 flashcards and 60 comprehensive key notes split across all 6 topics, plus a mistakes bank and the Readiness Score.

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Exam details are summarized from the official candidate information available in October 2026. BICSI changes formats and fees, so confirm with SCTE, a subsidiary of CableLabs before you book. RCDDQuizBank is not affiliated with BICSI or Pearson VUE.

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