How Cable Internet Works | DOCSIS and Cable Modems Explained

DOCSIS 3.0, 3.1, and 4.0 explained! Learn how a cable modem or internet modem connects to the CMTS through fiber optic and coaxial cable networks. This video breaks down how DOCSIS technology powers high-speed internet from the headend to your home.

We’ll explore how data travels from the internet router at the headend, through the fiber link to the fiber node, and then onto the hardline coax and RG6/RG11 cables that reach your modem. You’ll also learn about FDMA, TDMA, tap dB levels, and why 75-ohm terminations are critical for signal balance and quality.

Other key topics include how DOCSIS 3.0 modems bond channels, how DOCSIS 3.1 and 4.0 increase capacity using OFDM, and how your modem accepts frames based on its MAC address.

Whether you’re a telecom student, technician, or just curious about how cable internet really works, this lesson from Trevor at Telecom Training gives you a full, step-by-step explanation of the cable broadband system.

📘 Topics Covered:

Headend, router, and CMTS architecture

Fiber-optic data transmission

DOCSIS 3.0, 3.1, and 4.0 overview

FDMA and TDMA explained

Hardline vs. RG6/RG11 coax cables

Tap dB levels and signal loss

75-ohm termination and reflections

Cable modem MAC address identification

📺 Watch more Telecom Training videos to learn about fiber optics, Wi-Fi, and broadband networking.
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Видео How Cable Internet Works | DOCSIS and Cable Modems Explained канала Telecom Training