SCTE BDS Exam Study Guide (2026)
Everything the SCTE Broadband Distribution Specialist (BDS) 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 | 50 questions (SCTE Certification Exam Integrity Policy) |
|---|---|
| Time | 2 hours; the exam cannot be paused and breaks are not allowed |
| Passing score | 76% minimum (38 of 50 correct), per the SCTE Certification Exam Integrity Policy |
| Format | Open book: SCTE training materials, books, printed documents, notes, tables, calculators and internet resources are allowed (digital content in a separate tab of the same browser); AI tools are not allowed. SCTE does not publish the question format; the practice items here are 4-option single-best-answer |
| Certifying body | SCTE (Society of Cable Telecommunications Engineers), a subsidiary of CableLabs |
| Test provider | Online through the SCTE account portal, with Proctorio automated remote proctoring on Chrome or Edge (webcam, microphone and photo ID required) |
Mind map: the whole exam on one screen
Read the complete SCTE BDS study notes for “System Architectures and Access Networks”
Our first full set of comprehensive notes, about 12 minutes of reading: The HFC layout · Cascades and serving areas · Distributed access · Plant splits · PON beside HFC, 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. System Architectures and Access Networks
How the access network is built: HFC, node serving areas, fiber deep, distributed access and PON. SCTE lists System Architectures as a BDS subject area but publishes no weights. This follows the Access Network Architectures course.
Key facts
- HFC path: headend or hub, fiber to an optical node, then coax through amplifiers and taps to the drop.
- Node+N describes the cascade: N is the number of amplifiers in series after the node. Node+0 has no amplifiers after the node.
- Fiber deep pushes nodes closer to homes, which shrinks serving areas and shortens or removes amplifier cascades.
- Remote PHY puts the physical layer in a Remote PHY device in the node; the MAC stays in the CCAP core. Remote MACPHY moves both.
- Distributed nodes are fed by digital Ethernet and need precise timing, normally IEEE 1588 PTP.
- Plant splits: sub-split 5 to 42 MHz (downstream from 54 MHz), mid-split 5 to 85 MHz (from 108 MHz), high-split 5 to 204 MHz (from 258 MHz).
- PON has no powered devices between the OLT and the ONT; passive splitters share one feeder fiber.
Flashcards
Exam tip: When a question mentions fewer homes per node, think less noise funneling and more capacity per home. When it mentions digital optics, analog laser impairments are out of the picture.
2. HFC System Design, Cable Math and Powering
Reading the design and doing the math: strand maps, gain and loss, tilt, and how AC power moves through the plant. Follows the HFC System Design course, which covers strand maps, sizing a power supply and voltage drop.
Key facts
- Level at any point = previous level + gain - cable loss - passive loss, worked at one frequency at a time.
- Span loss = rated loss per 100 ft x length / 100, at the design frequency.
- Strand maps show footage, cable size, tap values, amplifier locations, power supplies and inserters.
- Amplifier outputs are usually up-tilted, with high frequencies set above low ones to offset the cable's slope.
- Plant power is 60 or 90 V AC, usually quasi-square wave at 60 Hz, sent down the coax from power supplies.
- Voltage drop = current x loop resistance, where loop resistance counts center conductor and shield.
- Actives have switching regulators and draw roughly constant power, so current rises as input voltage falls.
- Size a supply from the total load of every active it feeds, and keep margin below its rated output.
Flashcards
Exam tip: Write every calculation down the map, one device at a time. Most wrong answers come from skipping a splitter or stopping at the tap input.
3. Distribution Components: Actives and Passives
What each device in the coaxial plant does: nodes, amplifiers and their plug-ins, taps, couplers, splitters and terminators. SCTE lists Distribution Components (actives, passives and coaxial cable) as a BDS subject area.
Key facts
- Amplifier types: trunk, bridger and line extender. A bridger feeds several distribution legs; a line extender is a single-output amplifier further out.
- Plug-ins set the operating point: pads are flat loss, equalizers cut low frequencies more, cable simulators cut high frequencies more.
- The diplex filter separates forward and return bands and must match the plant split.
- Automatic level control uses a pilot signal to hold output steady as temperature changes cable loss.
- A tap's value is the loss from input to its ports; insertion loss is the through loss to the next device.
- Lower-value taps have higher insertion loss. A terminating tap has no through path and ends the line.
- Two-way splitters lose about 3.5 dB per leg; a directional coupler splits unequally.
- Unused ports and line ends need 75-ohm terminators to prevent reflections and ingress.
Flashcards
Exam tip: Ask whether a question is about level or slope. Pads change level. Equalizers and cable simulators change slope.
Test yourself on these topics
Take the free 15-question SCTE BDS test, then save your results to unlock your Readiness Score and the mistakes bank.
4. Coaxial Cable and Hardline Connectorization
Why cable behaves as it does and how to terminate it: impedance, attenuation, return loss, velocity of propagation, hardline preparation and connectors. Follows the Coaxial Cable Fundamentals course.
Key facts
- Impedance depends on the ratio of outer conductor to center conductor diameter and on the dielectric; cable plant is 75 ohms.
- Loss rises roughly with the square root of frequency: four times the frequency gives about twice the dB loss.
Flashcards
Exam tip: Return loss is the one number where bigger is better for a mismatch. Do not confuse it with cable loss.
5. Signal Types, Modulation and Impairments
How signals are built and how they degrade: dB units, analog and QAM carriers, OFDM, and the main impairments. SCTE lists Signal Types (analog, modulation schemes, frequency spectrum and impairments) as a BDS subject area.
Key facts
- 0 dBmV is 1 mV across 75 ohms. Doubling voltage adds 6 dB; doubling power adds 3 dB.
- Adding two equal, uncorrelated noise sources raises the noise by 3 dB.
Flashcards
Exam tip: Identify an impairment by its shape: discrete beats suggest distortion, specific bands suggest ingress, short broadband bursts suggest impulse noise.
6. Sweep, Return Path and Test Equipment
Measuring and aligning the plant: forward and return sweep, unity gain, meters, spectrum analyzers, TDRs and status monitoring. SCTE's maintenance subject area and the HFC Signals and HFC Access Network Troubleshooting courses cover these.
Key facts
- Sweep compares the frequency response at a test point with a reference taken at the start of the cascade.
- Ripple distance in feet is about 492 x VP / ripple spacing in MHz.
Flashcards
Exam tip: Always correct for test point loss before comparing a reading with the design level.
7. FCC Rules, Signal Leakage and Troubleshooting
Compliance and fault finding: FCC Part 76 Subpart K technical standards, leakage limits, the cumulative leakage index and a methodical process for isolating faults. SCTE names FCC Rules and troubleshooting techniques in the BDS maintenance subject area.
Key facts
- Aeronautical bands are 108 to 137 MHz and 225 to 400 MHz; carriers there must be offset from aeronautical frequencies.
- Leakage limits: analog 20 µV/m at 3 m and digital 17.4 µV/m at 3 m from over 54 up to 216 MHz; analog 15 µV/m and digital 13.1 µV/m at 30 m at 54 MHz and below and over 216 MHz.
Flashcards
Exam tip: Most FCC questions turn on which number applies. Match the number to the task: monitoring, CLI, airspace or proof of performance.
8. Field Safety and Plant Construction
Working safely on the plant and building it to standard: PPE, ladders, pole climbing, vehicles, batteries, cable placement, bonding and grounding. SCTE lists Safety and Construction as a BDS subject area and recommends its Field Safety course.
Key facts
- OSHA 1910.268 covers telecommunications field work, including approach distances, climbing equipment and pole line grounding.
- Approach distances to exposed energized lines: avoid contact at 300 V and less; 12 in over 300 V to 750 V; 18 in over 750 V to 2 kV; 24 in over 2 kV to 15 kV; 36 in over 15 kV to 37 kV.
Flashcards
Exam tip: Safety questions reward sequence. Look, test, bond and then work.
How to pass
- It is open book, so bring a one-page sheet: dB and dBmV rules, the square-root rule for cable loss, voltage drop (I x R) and the ripple formula (492 x VP / spacing in MHz).
- Keep the FCC numbers apart: 20 µV/m at 3 m is the monitoring and repair threshold, 50 µV/m is the cutoff for counting leaks in the CLI, and 64 is the CLI limit.
- Check which way the signal travels. Forward levels are set at amplifier outputs with tilt; the return path is aligned for unity gain back to the node.
- SCTE recommends its Field Safety course on top of the BDS curriculum. Learn approach distances, fall protection on poles and how to test and bond before you touch anything on a joint-use pole.
Frequently asked questions
How long should I study for the SCTE BDS 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 SCTE BDS exam online?
BICSI's v15 handbook describes the RCDD exam at Pearson VUE test centers, not remote proctoring. Format: open book: scte training materials, books, printed documents, notes, tables, calculators and internet resources are allowed (digital content in a separate tab of the same browser); ai tools are not allowed. scte does not publish the question format; the practice items here are 4-option single-best-answer. Check pearsonvue.com/bicsi for the options in your country.
What score do I need to pass the SCTE BDS exam?
76% minimum (38 of 50 correct), per the SCTE Certification Exam Integrity Policy. The exam has 50 questions (scte certification exam integrity policy) and a time limit of 2 hours; the exam cannot be paused and breaks are not allowed.
What are the most tested topics?
The outline covers system architectures and access networks, hfc system design, cable math and powering, distribution components: actives and passives, coaxial cable and hardline connectorization, signal types, modulation and impairments, sweep, return path and test equipment, fcc rules, signal leakage and troubleshooting, field safety and plant construction. Use the free practice test to see which ones you need most.
The premium SCTE BDS study path
Premium SCTE BDS 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
- 1System Architectures and Access Networks8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Notes free with an account
- 2HFC System Design, Cable Math and Powering8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 3Distribution Components: Actives and Passives8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 4Coaxial Cable and Hardline Connectorization8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 5Signal Types, Modulation and Impairments7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 6Sweep, Return Path and Test Equipment7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 7FCC Rules, Signal Leakage and Troubleshooting7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 8Field Safety and Plant Construction7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- Final step: 6 full mock exams50 questions each, timed like test day. Pass them, then book your exam.Premium
Get every note, flashcard and question
Premium 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 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.
Premium Yearly
- 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 SCTE (Society of Cable Telecommunications Engineers), a subsidiary of CableLabs.