Try the full study dashboard free, no signup: practice, flashcards and your Exam Readiness Score. Open it →
RCDDQuizBank
Start free
Home / Practice tests / ETA FSS
ETA · Last updated November 2026

ETA Fiber Splicing Specialist (FSS): free practice test

FSS is ETA's stand-alone specialist certification for fusion splicing: single fiber, ribbon fiber and fusion splice-on connectors, plus splicer setup, maintenance and reporting. The written exam has 25 questions in 2 hours with a 75% pass mark, after a hands-on splicing course and skills exam at an ETA-approved school. This prep covers only the written exam.

Start the free 15-question testRead the study guide

Premium: 3,000 practice questions, 6 full mock exams, 800 flashcards and 60 comprehensive key notes, topic by topic. See the study path ·

Or open the free ETA FSS study dashboard: flashcards, notes and your Readiness Score, no signup →

About the ETA FSS exam

FSS is ETA's stand-alone specialist certification for fusion splicing: single fiber, ribbon fiber and fusion splice-on connectors, plus splicer setup, maintenance and reporting. The written exam has 25 questions in 2 hours with a 75% pass mark, after a hands-on splicing course and skills exam at an ETA-approved school. This prep covers only the written exam.

What's on the exam

ETA FSS
Fiber Optic Safety for Splicing
7 key facts
Optical Fiber Construction and Theory
8 key facts
Fiber Characteristics and ITU-T Designations
8 key facts
Fusion Splicer Parts, Setup and Maintenance
8 key facts
Fiber Preparation, Cleaving and Alignment
7 key facts
Splice Loss, Splice Standards and Protection
7 key facts
Ribbon and Mass Fusion Splicing
7 key facts
Splice Trays, Color Code and Documentation
7 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 ETA FSS exam

  • With only 25 questions, each one is worth 4%, so 7 wrong answers means a fail. Two hours is almost 5 minutes per question: reread every stem.
  • The competency list is short and specific: CDRH laser classes, OSHA, TIA-598 colors, ITU-T G.652.D, G.655 and G.657, Telcordia GR-20, arc calibration, ribbon pitch and 200 µm ribbon. Know each item on it.
  • ETA excludes cable and closure preparation from FSS except the purpose of a splice closure. Spend your time on the splicer itself: settings, alignment, cleaving, protectors and maintenance.
  • Expect practical splicer-screen judgements: bad cleave angle, dirty optics, wrong heater program, high estimated loss. Learn what each symptom points to and the fix.

Save your results and get your Readiness Score

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.

Take the test first

What's in the premium ETA FSS prep

Premium ETA FSS 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 8 topics

Your step-by-step study path

  1. 1
    Fiber Optic Safety for Splicing8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Notes free with an account
  2. 2
    Optical Fiber Construction and Theory8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  3. 3
    Fiber Characteristics and ITU-T Designations8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  4. 4
    Fusion Splicer Parts, Setup and Maintenance8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  5. 5
    Fiber Preparation, Cleaving and Alignment7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  6. 6
    Splice Loss, Splice Standards and Protection7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  7. 7
    Ribbon and Mass Fusion Splicing7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  8. 8
    Splice Trays, Color Code and Documentation7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  9. Final step: 6 full mock exams50 questions each, timed like test day. Pass them, then book your exam.
    Premium
Free with an account

Read the complete ETA FSS study notes for “Fiber Optic Safety for Splicing”

Our first full set of comprehensive notes, about 12 minutes of reading: Laser classes and eye safety · Fiber shards, chemicals and SDS · Fusion splicer handling and electrical hazards · OSHA and the workplace, 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.

Open the free dashboard

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. A crew opens a manhole to fusion splice a damaged cable. Before the splicer is powered up and an arc is struck inside the manhole, what must be confirmed?
Answer: The atmosphere has been tested and is free of flammable gas. A fusion splicer's electric arc can ignite flammable gas such as methane or sewer gas, so the space must be gas tested (and ventilated, under OSHA confined space rules) before splicing. Battery charge and oven temperature affect the work, not the explosion hazard. Rule: test the air before any arc or flame below grade.
2. A legacy 62.5/125 µm multimode backbone is fusion spliced to a new 50/125 µm multimode extension. Alignment and cleaves are good. How will the splice behave?
Answer: High loss mainly when light travels from the 62.5 µm fiber into the 50 µm fiber. Light leaving a larger core with a higher numerical aperture cannot all enter a smaller core, so loss going from 62.5 µm into 50 µm is about 2 dB or more. In the other direction the smaller core's light fits inside the larger one with little loss. Matching cladding diameters let the fibers align, but core size and NA mismatch are intrinsic losses no splicer can remove.
3. Fibers are proof tested to a high tensile load at the factory, yet a stripped fiber snaps easily at the edge of the splice protector a day later. What is the most likely cause?
Answer: Bare glass was nicked by the stripper or by handling. Glass strength depends on its surface: a nick from a worn or misused stripper, or contact with fingers and debris, creates a flaw that cracks under small bending or tension. Proof testing only screens out flaws already present at manufacture. Use a clean, correctly sized stripper and don't let bare glass touch anything before it is protected.
4. A G.652.D outside plant cable will be spliced to a G.657.A2 drop fiber for an FTTH install. What should the splicer expect?
Answer: A normal single-mode splice, as G.657.A meets G.652.D. ITU-T G.657 category A fibers are bend-improved fibers that meet G.652.D requirements, so they splice to standard single-mode fiber with the normal single-mode program and low loss. Category B fibers allow tighter bends but may have a smaller mode field diameter, giving more mismatch loss. Check the A or B category on the cable data sheet.
5. OTDR traces on an older G.652 cable show a loss peak near 1383 nm that newer cable in the same route doesn't show. What causes it?
Answer: OH (water) ion absorption, reduced in G.652.D fiber. Water (OH) contamination in the glass absorbs light around 1383 nm, the water peak. G.652.D fiber is made with low water content so the E-band can be used, for example in CWDM. Rayleigh scattering falls as wavelength increases, and dispersion spreads pulses rather than adding a loss peak.
6. A technician has just installed a new pair of electrodes in a fusion splicer. What should be done before production splicing resumes?
Answer: Condition the electrodes, then run an arc calibration. New electrodes change the arc's shape and intensity, so the splicer needs its electrode conditioning routine and then an arc calibration to restore the correct fusion energy. Manually raising power risks overfused, high-loss splices. Arc calibration is also needed when temperature, humidity or altitude change noticeably.
7. On the splicer monitor, a dark spot appears at the same place on the screen whether or not a fiber is loaded, and alignment errors are frequent. What should be cleaned?
Answer: The camera lenses and LED windows. A blemish that stays fixed on the screen whatever the fiber does is dirt on the imaging optics, which the splicer reads as part of the fiber image. Clean the objective lenses and LED windows gently with a swab as the manufacturer describes. Dirt in the V-grooves or clamps shows up as fiber offset rather than a fixed spot.
8. Over a morning of splicing, the splicer reports cleave angles creeping from about 0.3° to above 1.5° on most fibers, even with careful stripping and cleaning. What is the most likely fix?
Answer: Move the cleaver blade to a fresh position and clean it. A steady rise in cleave angle across many fibers points to a worn blade position or a dirty cleaver, not the individual fibers. Advance the blade per the manufacturer and clean the pads. Raising the reject limit or overfusing hides bad cleaves and produces high-loss, weak splices; most splicers reject angles above about 1°.
9. A batch of single-mode fiber has a noticeable core-to-cladding concentricity error. Which splicer alignment method gives the lowest splice loss?
Answer: Core alignment using the core image (profile alignment). Core alignment systems image the cores and move the fibers until the cores, not the outside surfaces, line up, so an off-center core is compensated. Fixed V-groove (clad) alignment lines up the cladding outer diameters, so any core offset becomes splice loss. Ribbon splicers use V-groove alignment for this reason and typically give somewhat higher loss.
10. Bidirectional OTDR testing of one fusion splice gives 0.18 dB from end A and 0.06 dB from end B. What loss should be recorded?
Answer: 0.12 dB. Single-direction OTDR splice readings are skewed by mode field diameter and backscatter differences between the two fibers, so the true loss is the average of both directions: (0.18 + 0.06) / 2 = 0.12 dB. Adding the two readings or taking the higher one overstates the loss. Record both raw readings and the average.
11. After heat shrinking, a splice protector shows the bare fiber bowed into an S-shape inside the sleeve, and the loss at that splice is higher than the splicer's estimate. What went wrong?
Answer: The fiber was twisted or slack when the sleeve was heated. The fiber must be straight, untwisted and under light tension, with the sleeve centered over the bare glass, before heating. A bowed fiber is a microbend locked in by the shrinking tube, adding loss and stress. An underheated sleeve shows trapped air or loose ends, and the strength member position doesn't create an S-bend.
12. A crew will mass fusion splice a 12-fiber ribbon made from 200 µm coated fibers. The splicer kit has only fiber holders for standard 250 µm ribbon. What is the problem?
Answer: Its 200 µm pitch won't seat in 250 µm-spaced V-grooves. Ribbon pitch is the center-to-center spacing of its fibers. A 200 µm ribbon has a 200 µm pitch, so in a 250 µm holder and V-groove block the fibers drift out of their grooves and misalign. Use holders made for 200 µm ribbon or a splicer that supports it. The cladding is still 125 µm, so the single-mode program is unchanged.
13. Twelve fibers from one loose buffer tube must be mass fusion spliced to a 12-fiber ribbon cable. What has to be done to the loose fibers first?
Answer: Ribbonize them in TIA-598 color order to match the ribbon's fiber sequence. Loose fibers are made into a temporary ribbon with a ribbonizing tool or bonding agent, laid in the same color order as the ribbon, so fiber 1 meets fiber 1 and so on. Mass fusion needs all 12 ends cleaved together at the same length. Staggered or loose ends can't be held, cleaved or aligned as a group.
14. A 72-fiber loose tube cable has six tubes of 12 fibers, using the TIA-598 color code. Where is fiber 47?
Answer: Brown tube, rose fiber. Fiber 47 is 3 full tubes (36 fibers) plus 11, so it's in the fourth tube, brown, and is the eleventh color, rose. The TIA-598 sequence is blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, aqua for both tubes and fibers. Count with the sequence, don't guess from position on the tray.
15. A splicing job on a 144-fiber cable is complete. Which record best meets normal splice documentation practice?
Answer: A sheet of fiber, tray and slot with two-way OTDR loss. Good records tie every splice to its location (closure, tray, slot) and fiber identities, with measured bidirectional loss and the saved OTDR traces as proof. Splicer estimates are not measurements, and photos or totals can't show which fiber failed later. These records support acceptance, restoration and future moves.

Get the full ETA FSS prep

Most popular · cancel anytime

Premium Monthly

$147/month
per exam
About $4.83 a day · a fraction of a retest fee, for the credential that gets you on the bid list
  • 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 monthly until you cancel. Cancel in two clicks from your account; you keep access until the end of the month you've paid for. No minimum term.

Best value · 3 months free

Premium Yearly

$1,323/year
per exam
Pay for 9 months, get 12. Save $441 against paying monthly.
  • 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.

Pass Guarantee. Complete the full prep, sit your exam within 60 days, and if you don't pass we refund 100% of your subscription payments. See the requirements
Secure checkout by Stripe Card, Apple Pay, Google Pay Pass Guarantee

ETA FSS exam FAQ

How many questions are on the ETA FSS exam?

25 multiple-choice questions, with a time limit of 2 hours. Format: closed book; scratch paper and a non-programmable calculator are allowed. eta requires a splicing training course and hands-on skills exam at an eta-approved school, so this prep covers only the written knowledge exam.

What is the passing score for ETA FSS?

75%.

How much does the ETA FSS exam cost?

US$155 for the exam, with one free retake within one year of the first sitting; course and hands-on fees are set by the school. Certification term 4 years, with maintenance required. BICSI fees can change without notice, so confirm on bicsi.org before you apply.

Which languages is the ETA FSS exam offered in?

English. ETA does not list other languages for FSS; confirm with ETA or your school.

Where do I take the ETA FSS exam?

ETA-approved fiber training schools with an ETA Course Approval, which run the required splicing course and hands-on skills exam; the written exam is proctored by an ETA Certification Administrator online (Trapeza) or on paper.

Is this ETA FSS 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 ETA FSS prep is Premium at $147 a month for this exam.

What's in the premium ETA FSS prep?

3,000 practice questions organized topic by topic (Fiber Optic Safety for Splicing: 375; Optical Fiber Construction and Theory: 375; Fiber Characteristics and ITU-T Designations: 375; Fusion Splicer Parts, Setup and Maintenance: 375; Fiber Preparation, Cleaving and Alignment: 375; Splice Loss, Splice Standards and Protection: 375; Ribbon and Mass Fusion Splicing: 375; Splice Trays, Color Code and Documentation: 375), 6 full-length timed mock exams of 50 questions, 800 flashcards and 60 comprehensive key notes split across all 8 topics, plus a mistakes bank and the Readiness Score.

Related practice tests

ETA

Data Cabling Installer (DCI)

DCI is ETA International's stand-alone certification for copper communications cabling installers.

15 free questions3,000 premium Qs · 6 mocks · 800 flashcards · 60 key notes
Start free test →
ETA

Fiber Optics Installer (FOI)

FOI is ETA International's stand-alone certification for premises fiber optic installers and the prerequisite for the Fiber Optics Technician (FOT).

15 free questions3,000 premium Qs · 6 mocks · 800 flashcards · 60 key notes
Start free test →
ETA

ETA Fiber Optics Technician, Inside Plant (FOT-ISP)

FOT-ISP is ETA's technician-level certification for inside plant fiber: multimode and single-mode links in premises, enterprise and data center networks.

15 free questions3,000 premium Qs · 6 mocks · 800 flashcards · 60 key notes
Start free test →

Exam details are summarized from the official candidate information available in October 2026. BICSI changes formats and fees, so confirm with ETA International (Electronics Technicians Association), accredited by ICAC under ISO/IEC 17024 before you book. RCDDQuizBank is not affiliated with BICSI or Pearson VUE.

Start the free test