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BICSI · Last updated November 2026

Outside Plant Designer (OSP): free practice test

BICSI's credential for designers of outside plant communications infrastructure. The exam follows nine competencies, led by underground, buried and aerial platform design at 14-15% each and media selection at 13-14%. The handbook names the Outside Plant Design Reference Manual (OSPDRM), 6th edition, and suggests 100 hours of independent study.

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About the BICSI OSP exam

BICSI's credential for designers of outside plant communications infrastructure. The exam follows nine competencies, led by underground, buried and aerial platform design at 14-15% each and media selection at 13-14%. The handbook names the Outside Plant Design Reference Manual (OSPDRM), 6th edition, and suggests 100 hours of independent study.

What's on the exam

BICSI OSP
Pre-Design Preparation
7 key facts
Perform Site Survey
6 key facts
Select Media, Platform and Cables
7 key facts
Design Underground Platform and Spaces
7 key facts
Design Buried Platform and Spaces
7 key facts
Design Aerial Platform and Spaces
8 key facts
Prepare Design
6 key facts
Quality Control and Professional Responsibilities
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 BICSI OSP exam

  • 100 questions in 2 hours is 72 seconds each. Allow more time for guy tension, sag and loss budget calculations.
  • Underground, buried and aerial design together make up 42-45% of the exam. Know each platform's structures, methods and grounding.
  • Some items need two correct answers. Read each stem for 'select two' before committing.
  • The handbook lists design tasks by construction type, including delta and wye aerial grounding, ADSS and contained environmental vaults. Do not skip the specialist items.

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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 BICSI OSP prep

Premium BICSI OSP 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, 100 questions each, timed
800flashcards with spaced repetition, sorted by topic
60comprehensive key notes across 8 topics

Your step-by-step study path

  1. 1
    Pre-Design Preparation8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Notes free with an account
  2. 2
    Perform Site Survey8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
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  3. 3
    Select Media, Platform and Cables8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  4. 4
    Design Underground Platform and Spaces8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  5. 5
    Design Buried Platform and Spaces7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  6. 6
    Design Aerial Platform and Spaces7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  7. 7
    Prepare Design7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  8. 8
    Quality Control and Professional Responsibilities7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  9. Final step: 6 full mock exams100 questions each, timed like test day. Pass them, then book your exam.
    Premium
Free with an account

Read the complete BICSI OSP study notes for “Pre-Design Preparation”

Our first full set of comprehensive notes, about 13 minutes of reading: Existing technology and infrastructure · Geography · Financial and regulatory limits · Client requirements and forecasting, 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. A campus plan links 6 buildings, each needing 12 fibers back to the core, with 50% growth allowance on top. Cable is stocked in 72, 96, 144 and 216 fiber sizes. What should the designer specify?
Answer: 144 fibers. Required count is 6 x 12 = 72 fibers, and 50% growth makes 108. The next stocked size that covers 108 is 144 fibers. Specifying 72 ignores the growth forecast, and 96 covers less than the 108 needed.
2. The client's facility master plan shows a new building within three years directly over the proposed duct route. What should the designer do?
Answer: Revise the route to avoid the future footprint and record the reason. Interpreting the master plan is part of pre-design, so known future construction should shape the route now. Relocating plant later costs far more than rerouting on paper. Depth does not solve a building foundation conflict, and noting it without acting leaves the problem in the design.
3. A proposed route crosses a private parcel between two public roads. The landowner has said in conversation that the work is fine. What is needed before the route is finalized?
Answer: A written easement or right-of-way grant for the crossing. Occupying private land needs a documented right, normally an easement, that binds the landowner and future owners. A verbal agreement can be disputed and does not survive a sale. Locate tickets and photographs serve damage prevention and records, not land rights.
4. A copper design must keep loop resistance at or below 1,300 ohms on a 23,000 ft loop. Using loop resistance per 1,000 ft of 16.1 ohms for 19 AWG, 32.4 for 22 AWG, 51.9 for 24 AWG and 83.3 for 26 AWG, which is the finest gauge that meets the limit?
Answer: 24 AWG. At 23 kft, 24 AWG gives 23 x 51.9 = about 1,194 ohms, which meets the limit, and 26 AWG gives about 1,916 ohms, which does not. A larger gauge also passes but uses more copper at higher cost. The finest gauge that passes is 24 AWG.
5. A GPON link has a 28 dB budget. It has 15 km of fiber at 0.35 dB/km, a 1x32 splitter with 17.5 dB loss, two connector pairs at 0.5 dB each and six splices at 0.1 dB each. What is the remaining margin?
Answer: 3.65 dB. Fiber is 15 x 0.35 = 5.25 dB, and adding 17.5 + 1.0 + 0.6 gives 24.35 dB total. Margin is 28 - 24.35 = 3.65 dB. Forgetting the splices gives 4.25 dB, and forgetting the connectors gives 4.65 dB. Add every element in the optical path.
6. An unlisted outside plant fiber cable enters a building and the main cross-connect is 45 m away along open cable tray. What should the designer specify under the NEC's rule for unlisted cable entering buildings?
Answer: Transition to listed cable in an enclosure within 15 m (50 ft) of entry. Unlisted outside plant cable may extend only 15 m (50 ft) inside the building from its point of entrance, and must end in an enclosure, unless it is in a permitted raceway. Being non-conductive does not remove the fire-listing requirement, and plenum spaces are excluded from this allowance.
7. A cable enters a 90-degree conduit sweep with 200 lbf of tension. The coefficient of friction is 0.3. Using the standard exponential bend formula, what is the tension leaving the sweep?
Answer: 320 lbf. Tension out equals tension in multiplied by e raised to the friction coefficient times the bend angle in radians. Here 200 x e^(0.3 x 1.571) = 200 x 1.60 = about 320 lbf. Multiplying by 1 + 0.3 gives 260 lbf and ignores the exponential effect, which is why bend location and pull direction matter.
8. A provider needs active electronics below ground because the neighborhood allows no above-ground cabinet. Which structure is designed for this?
Answer: A contained environmental vault with climate control. A contained environmental vault is a sealed underground room with climate control, power and dewatering, built for active equipment. A maintenance hole is for cable and splices and floods. Pull boxes and buried closures are not designed to give electronics a controlled environment or give staff access.
9. A copper cable with a metallic shield is spliced in a maintenance hole. How should the shield be treated at the splice?
Answer: Bond the shields across the splice and to the maintenance hole grounding. Shield continuity must be kept through the splice and bonded to the structure's grounding, so induced currents and faults have a controlled path. An open shield leaves an isolated, floating section that can hold dangerous voltages and increases noise. Removing shield creates the same discontinuity.
10. A route must cross a four-lane state highway, and the DOT permit forbids open cutting the pavement. Which method should be designed?
Answer: Directional bore beneath the highway. A directional bore passes under the roadway without disturbing the surface, which is what the permit requires. Open trench and plowing both cut the pavement. A temporary aerial span does not deliver the permanent buried route, and it adds its own clearance and permit issues.
11. A bore path crosses a high-pressure gas main shown by locate paint. What is the right design requirement before boring?
Answer: Expose the main by potholing to confirm its position at the crossing. Locate marks and record plans can be inaccurate, so the design should require the line to be exposed by potholing where the bore crosses, and clearance verified. Adding depth without seeing the line is guesswork. Damage to a high-pressure main is a life-safety event, so visual confirmation is the rule.
12. A pole has 3,000 lbf of horizontal unbalanced tension at the height of a guy attachment. The attachment is 24 ft above ground and the guy lead is 18 ft. What tension does the guy carry?
Answer: 5,000 lbf. Guy length is the hypotenuse, sqrt(24² + 18²) = 30 ft. Guy tension is horizontal load x length / lead = 3,000 x 30 / 18 = 5,000 lbf. A shorter lead increases guy tension, so dividing by height instead of lead gives the wrong, lower figure.
13. A joint-use aerial route runs on poles carrying a delta primary with no multigrounded neutral. How should the communications messenger be grounded?
Answer: Bond it to dedicated driven grounds at intervals along the route. A delta system has no multigrounded neutral to bond to, so the messenger needs its own driven grounds at the intervals the design calls for. There is no pole-top neutral in this scenario, and a floating messenger leaves no fault or lightning path. Bonding to phase conductors would be dangerous.
14. A concept ROM covers 6,000 m of buried route at US$38 per meter and 4 maintenance holes at US$9,000 each, with a 15% contingency on the total. What is the rough order of magnitude?
Answer: US$303,600. Route cost is 6,000 x 38 = US$228,000, and maintenance holes add US$36,000, for US$264,000. A 15% contingency gives US$303,600. Applying it only to the route gives a lower total that misses risk on the structures. State the ROM as a range or estimate, because it is not a bid price.
15. After the final design package is issued, a field crew asks to move a handhole 12 m onto a different parcel to avoid a tree. What should the designer require?
Answer: Process a design change that rechecks rights, permits and drawings. Moving a structure onto a different parcel can change easements, permits and the design, so it goes through the design change process and the drawings are reissued. Field notes alone don't secure rights, and a tolerance applies to position within the same right of way. Deferring it to as-builts creates an unauthorized installation.

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BICSI OSP exam FAQ

How many questions are on the BICSI OSP exam?

100 questions: multiple choice with one correct answer and multi-selection multiple choice with two correct answers, with a time limit of 2 hours (no scheduled breaks; any break counts toward the time). Format: computer-based; no personal items or references in the test room, and a calculator and whiteboard are provided. the real exam also has two-answer multi-select items; this prep uses 4-option single-best-answer items.

What is the passing score for BICSI OSP?

Not published. BICSI sets the passing score by standard setting (Angoff method) and reports pass or fail; failing candidates get a score report by topic area, not a score. Practice to 75% or higher.

How much does the BICSI OSP exam cost?

US$510 for BICSI members, US$725 for nonmembers (application including first attempt, 2026 handbook); retest US$230 members, US$355 nonmembers, paid to Pearson. BICSI fees can change without notice, so confirm on bicsi.org before you apply.

Which languages is the BICSI OSP exam offered in?

English (the 2026 handbook lists no other language; confirm with BICSI).

Where do I take the BICSI OSP exam?

Pearson Professional Assessments (Pearson VUE), computer-based; schedule at pearsonvue.com/bicsi.

Is this BICSI OSP 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 BICSI OSP prep is Premium at $147 a month for this exam.

What's in the premium BICSI OSP prep?

3,000 practice questions organized topic by topic (Pre-Design Preparation: 375; Perform Site Survey: 375; Select Media, Platform and Cables: 375; Design Underground Platform and Spaces: 375; Design Buried Platform and Spaces: 375; Design Aerial Platform and Spaces: 375; Prepare Design: 375; Quality Control and Professional Responsibilities: 375), 6 full-length timed mock exams of 100 questions, 800 flashcards and 60 comprehensive key notes split across all 8 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 BICSI before you book. RCDDQuizBank is not affiliated with BICSI or Pearson VUE.

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