Bit and information theory and optical telegraph: what they have in common

1. Step 1. Bit and information theory — is used in — Packet switching. Packets are sequences of bits.
2. Step 2. Packet switching — works like — Electrical telegraph. An analogy: telegraph messages were passed from station to station with intermediate storage — a “store and forward” principle similar to packet transmission.
3. Step 3. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.

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