Compact disc and smart meter: what they have in common

1. Step 1. Compact disc — is a kind of — Optical disc (CD/DVD). An optical disc.
2. Step 2. Optical disc (CD/DVD) — uses — Laser diode. Read by a laser.
3. Step 3. Laser diode — is used in — Optical fibre. The source is a laser.
4. Step 4. Optical fibre — is used in — Base station. The link to the core network.
5. Step 5. Base station — is part of — Cellular network. Cells.
6. Step 6. Cellular network — is used in — Smart meter. Data transmission.

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