Method and apparatus for broadband transmission from a central office to a number of subscribers
First Claim
1. A system for delivering broadband services from a broadband digital data signal source via a telephone central office to a subscriber, comprising:
- (a) a subscriber set top terminal at the location of the subscriber;
(b) channelizing means for forming the signal from said source into a plurality of channels each of a characteristic channel center frequency and with the signals for each channel having control bits and payload bits wherein the control bits identify for each subscriber that portion of the payload bits intended for that subscriber;
(c) a multiplexer and transmitter for transmitting the channel signals from the central office to a local distribution box;
(d) a signal distribution system at said local distribution box operative to receive signals transmitted by said transmitter and direct them to one or more subscriber set top terminals;
(e) a pair of fibre optic lines coupled between said transmitter and said receiver for carrying signals therebetween; and
(f) a transmission line between said distribution box and said set top terminals;
wherein said set top terminal is operative to detect a selected channel of data and process said data and to transmit user control information to said box, along said transmission line to said central office.
3 Assignments
0 Petitions
Accused Products
Abstract
A method of transmitting broadband video services from a broadband digital signal source which includes forming the digital signal from said source into a plurality of channels of digital signals and modulating a plurality of carrier signals with respective channels of the digital signals. The resultant modulated channels are multiplexed to form a combined signal which is then used to modulate light from a laser light source. The modulated light signal is transmitted along a light fibre to a local distribution box where it is converted to electrical signals and broadcast to a number of subscriber set top terminals, Each set top terminal detects the modulated signal of a channel pre-assigned to that set top terminal. User control information is also received by that set top terminal and transmitted to the central office.
116 Citations
18 Claims
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1. A system for delivering broadband services from a broadband digital data signal source via a telephone central office to a subscriber, comprising:
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(a) a subscriber set top terminal at the location of the subscriber; (b) channelizing means for forming the signal from said source into a plurality of channels each of a characteristic channel center frequency and with the signals for each channel having control bits and payload bits wherein the control bits identify for each subscriber that portion of the payload bits intended for that subscriber; (c) a multiplexer and transmitter for transmitting the channel signals from the central office to a local distribution box; (d) a signal distribution system at said local distribution box operative to receive signals transmitted by said transmitter and direct them to one or more subscriber set top terminals; (e) a pair of fibre optic lines coupled between said transmitter and said receiver for carrying signals therebetween; and (f) a transmission line between said distribution box and said set top terminals; wherein said set top terminal is operative to detect a selected channel of data and process said data and to transmit user control information to said box, along said transmission line to said central office. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for delivering broadband services from a broadband digital signal source via a telephone central office to a subscriber set top terminal, comprising:
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(a) means for modulating carrier signals selected frequencies with signals from said signal source, said carriers corresponding to respective ones of a plurality of channels; (b) optical fibres coupling the central office to an outside signal receiving installation; (c) means for multiplexing the modulated channel signals into a combined signal and converting the combined signal into a modulated light signal and directing the light signal down one of said fibres; (d) means for converting the modulated light into electrical signals; (e) a twisted copper pair connected between said light converting means and the subscriber set top terminal; (f) a transmitter coupled to said twisted copper pairs for transmitting said converted electrical signals to the subscriber set top terminal; and (g) means for transmitting electrical signals from the subscriber set top terminal to the central office over said twisted pair and another of said optical fibres; wherein said signal source places control bits and payload bits in each channel wherein the control bits identify to each set top terminal the portion of the payload bits for that set top terminal and processes subscriber input data into frames and transmits the frames. - View Dependent Claims (9, 10, 11, 12)
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13. A method of transmitting broadband video services from a broadband digital signal source, comprising:
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(a) forming the digital signal from said source into a plurality of channels of digital signals including control bits and payload bits, wherein the control bits identify to each set top terminal the portion of the payload bits destined for that set top terminal; (b) modulating a plurality of carrier signals with said respective channels of digital signals; (c) multiplexing the modulated signals to form a combined signal; (d) transmitting the combined signal to a local distribution box; (e) broadcasting the electrical signal to a number of set top terminals wherein each set top terminal detects a corresponding channel; and (f) generating in the set top terminal control signals in response to user input and transmitting the control signals to the central office. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification