Project Scoping, Design, and Planning

Why Project Scoping and Design Come First

Before a single wire is pulled or a component is soldered, a professional technician produces a complete design package. Rushing to the build phase without a solid plan is one of the most common causes of rework, cost overruns, and failed inspections. In this capstone lesson you will learn how to translate a written scope of work into the four documents that make your project reviewable, buildable, and defensible: a design brief, a block diagram and schematic, a bill of materials (BOM), and a work plan.

Reading and Analyzing a Scope of Work

A scope of work (SOW) is a written statement from a customer or project manager that describes what must be delivered, where, and under what conditions. Your first task is to extract every deliverable, identify all signal paths, and flag any compliance requirements before you draw a single line.

Work through the SOW systematically:

1. Deliverables — List every end product the customer expects: installed cabling, a working RF receive chain, a powered subassembly, test reports, and as-built documentation.

2. Signal paths — Trace how each signal travels from source to load. For a small-office telecom and electronics installation this typically includes an RF receive path (antenna → coax → distribution), a structured cabling backbone (patch panel → horizontal runs → work area outlets), fiber optic links (optical line terminal → fiber → optical network terminal or device), and one or more powered circuit subassemblies (power supply → load).

3. Compliance requirements — Note every standard or code the installation must meet. For structured cabling, BICSI's Telecommunications Distribution Methods Manual (TDMM) is the primary design reference. Fiber work must meet EIA/TIA standards for testing and termination. Electrical circuits must conform to applicable electrical codes. Record these in your design brief so reviewers can verify compliance at each milestone.

Organize your findings in a structured design brief: a one- or two-page document that lists deliverables, signal paths, applicable standards, and any constraints (room dimensions, power budget, customer-specified equipment).

Block Diagrams and Schematics

A block diagram uses labeled rectangles and arrows to show the functional relationships between major system elements. It is not a schematic — it shows what connects to what, not exactly how the circuit works at the component level. Draw the RF receive chain, the structured cabling backbone, the fiber optic links, and the powered subassembly as separate subsystems, then show how they interconnect.

Best practice: draw a rough hand sketch first on graph paper, then produce a clean version in a free CAD tool such as KiCad. Check that every signal path in the SOW appears in the diagram.

Once the block diagram is approved, produce a schematic for the circuit portions (the powered subassembly and any active RF components). A proper schematic follows these conventions, which align with ETA CET study guide requirements:

• Each component has a unique reference designator (R1, C1, U1, etc.).
• Every component shows its value (resistance in ohms, capacitance in farads or microfarads, voltage rating, etc.).
• Power rails are clearly labeled (e.g., +12 V, GND).
• Signal flow moves left to right where possible.
• Nets (wires connecting pins) are labeled where they cross the schematic boundary or connect to another sheet.

Building the Bill of Materials

The bill of materials (BOM) is a spreadsheet with one row per unique part. Required columns:

| Column | Purpose |

|---|---|

| Reference Designator(s) | Links the BOM row to the schematic |

| Part Description | Human-readable name |

| Manufacturer Part Number | Uniquely identifies the part |

| Quantity | Total needed for the build |

| Unit Cost | Price per piece |

| Extended Cost | Unit Cost × Quantity |

| Lead Time | Days from order to delivery |

| Supplier | Where you will source the part |

Accuracy in the BOM prevents shortages that stall the build phase. Verify part numbers against a supplier catalog, not just a datasheet title.

Producing the Work Plan

A Gantt-style work plan allocates your remaining capstone hours across phases. Typical phases for this capstone are: build, test, troubleshooting, and documentation. For each phase, identify tasks, estimated hours, dependencies (what must finish before the next task starts), and who is responsible.

Keep your total allocated hours at or under the hours available. If tasks sum to more than the available time, you must reduce scope, increase efficiency, or flag the conflict to your instructor before the build begins — not after.

Safety Points That Apply at the Design Stage

Design decisions made now determine the hazards workers face during the build:

• Lockout/Tagout (LOTO): Any circuit powered from AC mains must include a LOTO point in the work plan. Identify which breaker or disconnect will be locked out before work begins on powered circuits.
• PPE selection: Your work plan should specify the appropriate PPE for each phase. Fiber work requires safety glasses to protect against glass shards. RF work near active transmitters requires awareness of RF exposure limits.
• Wire gauge and fusing: Selecting undersized wire or omitting a fuse in the schematic creates a fire or shock hazard. Verify that every conductor in the schematic is rated for its load current and that overcurrent protection is present.
• Cabling pathways: Per BICSI TDMM guidance, power cables and low-voltage data cables must be separated by adequate distance or barriers to prevent interference and comply with applicable codes.

A design package that ignores these points will not pass peer review and cannot proceed to build.