Fiber-optic communication networks transmit digital data across long distances by propagating pulses of light through glass fibers. The receiver at the end of the cable detects either the presence of light ('on') or the absence of light ('off').
Explain why this physical transmission system is suited to a binary format, and explain how this two-state system ensures high reliability even when the light signal degrades over long distances.
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.