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Distributed cable modem termination system

A modem, modulator technology, applied in the direction of electrical components, selective content distribution, data exchange through path configuration, etc.

Active Publication Date: 2015-06-17
威西码网络公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while phasing out legacy FDM TV signals will free up additional cable bandwidth, it will only meet increasing household demand for digital TV and DOCSIS services (data) for a few years at best

Method used

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  • Distributed cable modem termination system
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  • Distributed cable modem termination system

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Embodiment Construction

[0059] In one embodiment, the present invention may be a distributed cable modem termination system (CMTS) for a hybrid fiber cable (HFC) network. This system will typically consist of multiple parts.

[0060] In some embodiments, the system will work substantially independently of the CMTS at the cable plant, and will essentially serve to supplement the functionality of prior art CMTSs with the addition of a minimal amount of new equipment at the cable plant. Here, this new equipment at the cable plant cable will primarily consist of a Tier 2 / 3 switch, a virtual shelf management system (to be described), and appropriate MAC and PHY devices to send and receive data along the fiber . This prior art cable plant CMTS continues to operate as before, with one difference that the cable operator should provide some empty channels to provide room for the new channels provided by the present invention.

[0061] In other embodiments, parts of the system will be embedded in a high-leve...

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Abstract

Distributed CMTS device for a HFC CATV network serving multiple neighborhoods by multiple individual cables, in which the QAM modulators that provide data for the individual cables are divided between QAM modulators located at the cable plant, and remote QAM modulators ideally located at the fiber nodes. A basic set of CATV QAM data waveforms may be transmitted to the nodes using a first fiber, and a second set of IP / on demand data may be transmitted to the nodes using an alternate fiber or alternate fiber frequency, and optionally other protocols such as Ethernet protocols. The nodes will extract the data specific to each neighborhood and inject this data into unused QAM channels, thus achieving improved data transmission rates through finer granularity. A computerized virtual shelf control system for this system is also disclosed. The system has high backward compatibility, and can be configured to mimic a conventional cable plant CMTS.

Description

Background technique [0001] Cable television (CATV), originally introduced in the late 1940s as a way to transmit television signals via coaxial cable to houses located in areas of poor reception, has been modified and expanded over the years, allowing the cable medium to deliver constant Increasing numbers of different types of digital data, including both digital television and broadband Internet data. [0002] One of the most significant improvements occurred in the 1990s when a number of major electronics and cable operator companies working through Cablelabs, a non-profit R&D association, introduced the Data Over Cable Service Interface Specification (DOCSIS). First introduced in the late 1990s as DOCSIS Version 1.0, and upgraded many times since then (currently DOCSIS Version 3.0), the DOCSIS standard defines the physical layer (PHY) and At the Media Access Control (MAC) layer, these coaxial cables were originally designed to manage analog SDTV channels. [0003] Origi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/28H04N21/61
Inventor 塞利姆·什洛莫·拉基布
Owner 威西码网络公司