Hybrid fiber-coax system having at least one digital fiber node
First Claim
1. A method for reducing aggregated ingress noise in a hybrid fiber-coax transmission system that carries information form a head end to a plurality of subscribers via at least one main coax trunk and for carrying information originated by said plurality of subscribers to said head at least in part on said main coax trunk, comprising the steps of:
- aggregating onto the main coax trunk information generated by said plurality of subscribersdigitally regenerating the aggregated upstream signals for transmission on the main coax trunk to a fiber node; and
optically formatting, at said fiber node, the digitally-regenerated aggregated upstream signals modulated onto the high frequency band in baseband digital format for transmission to a head end.
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Abstract
A shared hybrid fiber-coax transmission system (100) includes at least one fiber node (180) that includes at least one receiver (460) for converting an upstream signal into a baseband digital format for conversion into a digitally modulated, optically-formatted signal for transmission to a head end (120). By converting the upstream signal into a digital baseband format for transmission in an optical format to the head end, ingress nose associated with the upstream signal can be reduced.
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Citations
4 Claims
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1. A method for reducing aggregated ingress noise in a hybrid fiber-coax transmission system that carries information form a head end to a plurality of subscribers via at least one main coax trunk and for carrying information originated by said plurality of subscribers to said head at least in part on said main coax trunk, comprising the steps of:
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aggregating onto the main coax trunk information generated by said plurality of subscribers digitally regenerating the aggregated upstream signals for transmission on the main coax trunk to a fiber node; and optically formatting, at said fiber node, the digitally-regenerated aggregated upstream signals modulated onto the high frequency band in baseband digital format for transmission to a head end. - View Dependent Claims (2, 3)
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4. A method of operating a shared hybrid fiber-coax transmission system in which a downstream signal is destined for transmission from a head end to individual subscribers and in which upstream signals are generated by subscribers for transmission to the head end, the method comprising the steps of:
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transmitting the downstream signal in an optical format from the head end to a fiber node for conversion to a downstream electrical signal; transmitting the downstream electrical signal, via a coaxial cable plant, to the individual subscribers; aggregating, in the coaxial cable plant, upstream signals generated by the subscribers; digitally regenerating, within the coaxial cable the aggregated upstream signals; transmitting the digitally regenerated upstream signals via the coax plant to the fiber node; and optically formatting, at the fiber node, the digitally regenerated aggregated upstream signals into a baseband digital format for transmission from the fiber node to the head end.
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Specification