Cable Modem Attenuator Automatic Signal Level Adjustment
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Solution Overview
Problem
Cable modem systems face challenges in maintaining an optimal signal-to-noise ratio due to human errors in manual configuration and changes in network topology and environmental conditions, requiring frequent adjustments.
Innovation Solution
An apparatus comprising a processor, attenuator, and cable modem termination system unit that automatically determines and adjusts transmit level margins to derive attenuation values, thereby improving the signal-to-noise ratio by attenuating upstream signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual configuration and adjustment of CMTS and amplifiers is performed, then signal levels can be adjusted to achieve adequate S/N ratio, but human errors occur and frequent re-adjustments are needed due to network changes
Solution Approach 1:
The system performs self-configuration and self-adjustment of signal levels automatically. The CMTS collects signal strength measurements from cable modems, calculates required attenuation values, and adjusts attenuators without human intervention. This eliminates manual configuration errors and enables the system to adapt automatically to network topology changes and environmental conditions, resolving the contradiction between reliability and ease of operation.
2Reliability
If frequent manual re-adjustments are performed to maintain S/N ratio, then signal quality can be maintained, but installation time and operational time are increased
Solution Approach 1:
The system continuously monitors signal strength measurements from cable modems and automatically adjusts attenuators in real-time to maintain optimal S/N ratio. This continuous automatic adjustment eliminates the need for frequent manual re-adjustments, maintaining signal quality consistency while significantly reducing the time spent on installation and maintenance operations.
3Extent of automation
If automatic attenuation adjustment is implemented, then S/N ratio is improved and manual intervention is reduced, but device complexity increases
Solution Approach 1:
The CMTS performs multiple functions: it acts as a communication gateway, collects signal strength measurements from cable modems, calculates attenuation values, and controls attenuators. By making the CMTS a multi-functional device that handles both communication and signal level management, the patent avoids adding separate dedicated measurement and control equipment, thereby reducing overall system complexity while achieving high automation.
Data Source
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AI summary
The invention relates to a use of an apparatus (200) for improving signal to noise ratio in a cable modem system. The apparatus (200) comprises a processor (204), an attenuator (218) and a cable modem termination system unit (210) for providing access to a communication network (104).