CBNT case studies
CBNT · Put your knowledge to work in context.
The CBNT (Certified Broadband Network Technician) is a broadband technician credential associated with SCTE, the cable telecommunications standards and education body. Candidates typically encounter it as an entry-to-journey-level certification for field technicians, headend and hub personnel, and installers who need to demonstrate competence across the physical and operational sides of a broadband access network. Because the official SCTE certification page for the CBNT currently returns a 404 error, the exam blueprint, item count, time limit, passing score, fee, retake rules, and validity period cannot be confirmed from the source. The domain weighting used on this page is therefore a study framework, not a published official blueprint: broadband network fundamentals and architecture (25%), coaxial and fiber cable installation and testing (25%), RF signal measurement, leakage and signal quality (25%), and safety, standards, and customer service practices (25%). The CBNT case studies are 5 cases and about 2,474 words.
1Intermittent Upstream Timeouts in a 48-Unit MDU
You are the third technician sent to unit 214 in a 48-unit garden-style MDU. The customer reports internet drops most evenings between 19:00 and 22:00 and during HVAC cycles.
593 words, about 3 min2GPON ONT Won't Range After a New Drop
A new FTTH customer in a 1:32 GPON splitter area has no service; the ONT power LED is green but the PON LED blinks. At the ONT, you measure 1490 nm downstream at -29.8 dBm.
496 words, about 2 min3Band 71 Ingress on One Feeder Branch
Complaints of pixelation on channels between 617 and 652 MHz come from eight homes on the same feeder branch of a 550-home node. The node's downstream OFDM channel occupying 618–658 MHz shows MER 40 dB at the node but 29 dB at the affected taps, with errors only when the wind blows.
462 words, about 2 min4Aerial Drop Clearance and Bonding at a Manufactured Home
A technician is installing a drop to a manufactured home. The existing aerial drop crosses a residential driveway at 13 ft 6 in.
453 words, about 2 min5Node Upstream Congestion After a Speed-Tier Launch
A 1.2 GHz HFC node serves 480 homes passed with 58% penetration. The node has four upstream ports, each combining 120 homes, and a 204 MHz split.
470 words, about 2 min