| 摘要 |
PURPOSE: A wireless subscriber service system of an HFC(Hybrid Fiber Coaxial) network is provided to construct a subscriber network wirelessly connecting propagation between a subscriber distributor and a PC, thereby enabling an Internet service or a multimedia service. CONSTITUTION: A line power inserting unit(10) separates a downward RF signal into an AC power and an RF signal. A DC power unit(20) converts the AC power into a DC power. An upper/lower attenuator(30) receives the RF signal to attenuate the signal, and receives an upward signal to attenuate the signal when the signal has a high level. The first bi-directional filter(40) receives the downward RF signal to separate a band, and receives the upward signal to separate a band, then outputs the upward signal to the upper/lower attenuator(30). An RF tuner(60) receives the downward RF signal to tune the signal to one TV channel frequency, and converts the signal into an IF. A downward demodulator(70) receives the downward signal to demodulate the signal to a digital signal, and decodes the signal. The first MAC(90) receives the decoded signal to withdraw information on user registration and access, and receives the upward signal to control subscriber information. An upper modulator(100) receives the upward signal to modulate the signal, and outputs the signal to an RF amplifier(50). The second bi-directional filter(110) receives the information to separate a band, and receives the upward signal to separate the band, then outputs the signal to the first MAC(90). An Ethernet-RF converter(130) receives the upward signal to output the signal to the second bi-directional filter(110), and receives the downward signal to convert the signal into an Ethernet-RF signal.
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