Putting Cable Technology All Together


- Router and HFC interface (DS/US ports)

- Bi-directional amplifiers

- Cable modem Issues

- Broadcast DS


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In the figure shown, the various cable technologies are combined to show how they work together. In the downstream path, entertainment signals come in on the left through satellite dishes, antennas, and analog and digital video servers.

The signals are combined onto a coaxial cable in the headend, and then are presented to a fiber transmitter. The fiber transmitter converts the signals into light and sends to a fiber node somewhere in town.

Farther down the distribution network, the light is converted back to an RF signal and distributed through an amplifier network by the use of taps and drops.

The cable modem receives RF signals, tunes the RF signal, demodulates the data signal back into digital data, and then presents it to the PC.

In the upstream path, the cable modem takes the response from the PC, modulates it to an RF signal, and transmits it at a specific frequency and power level. The transmission specifics are determined by the CMTS back into the drop, tap, distribution network, fiber, and eventually to the CMTS.

The CMTS tunes the RF signal, demodulates the data signal back to digital, and routes it to the Internet.

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