Rocket interstage and electrical telegraph: what they have in common

1. Step 1. Rocket interstage — is part of — Multistage rocket. It joins the stages and separates them with pyrotechnics.
2. Step 2. Multistage rocket — is used in — Space probe. Launch.
3. Step 3. Space probe — has part — Radio module and antenna. Communication with Earth.
4. Step 4. Radio module and antenna — is part of — Router. A Wi-Fi access point.
5. Step 5. Router — uses — Packet switching. It forwards packets.
6. Step 6. 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.

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