Modem
Traditional Meaning A modem (short for modulator–demodulator) is a device that converts signals so your computer or router can communicate with your Internet Service Provider (ISP). Fiber Era: ONT Core Functions Types of Modems Modem vs Router vs Switch Device Role OSI Layer Example Modem Converts signals, connects to ISP Layer 1 (Physical) DSL/cable/fiber modem Router Connects different networks, directs packets Layer 3 (Network) Home router linking LAN to Internet Switch Connects devices within LAN, forwards by MAC Layer 2 (Data Link) Office switch connecting PCs & printers
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