A fiber-optic telecommunications network transmits data over long distances by sending light pulses through glass cables.
Explain how this physical transmission medium represents data in a binary format, and why a two-state (binary) signal is preferred over a multi-state signal (such as ten different levels of light intensity).
117 exam-style questions on Edexcel GCSE Computer Science Binary, covering Binary representation and number of states, Unsigned and two's complement integers, Converting denary and 8-bit binary, Binary addition and binary shifts, Concept of overflow, and Hexadecimal notation and conversion. Each one has a worked solution and a mark scheme showing where the marks go.