Modem and truck: what they have in common

1. Step 1. Modem — has part — Digital signal processor. Signal processing in high-speed modems.
2. Step 2. Digital signal processor — is a kind of — Microprocessor. A specialized processor.
3. Step 3. Microprocessor — is part of — Anti-lock braking system (ABS). A control unit.
4. Step 4. Anti-lock braking system (ABS) — evolved from — Air brake. Anti-skid systems first appeared in aviation and on railways.
5. Step 5. Air brake — is part of — Truck. Air brakes, as on trains.

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