A focused, exam-oriented module covering the Principles of Transmission for the BICSI RCDD certification. You will learn conductors, wire gauge and insulation, twisted-pair and noise, signals and the decibel, transmission-line parameters, category performance and PoE, and optical fibre fundamentals — each explained in plain language with worked examples and practice questions. Independent exam-preparation material by Telecomie; not affiliated with or endorsed by BICSI.