Subscriber Line Interface Circuit Power Dissipation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Subscriber line interface circuits (SLICs) face significant power dissipation challenges during ringing events, leading to heat generation issues that compromise device density and cost-effectiveness in line cards, particularly due to high power dissipation in short loops with heavy REN loads and ring-trip conditions.
Innovation Solution
A method involving a feedback control loop that measures power parameters during ringing cycles, compares them to target values, and adjusts ringing signal parameters to minimize power dissipation, including battery switching and reduced ringing signals upon identifying ring-trip precursors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the SLIC drives maximum ringing signal to meet long loop specifications, then ringing voltage is sufficient for long loops, but power dissipation in the SLIC becomes excessive causing heat generation
Solution Approach 1:
The patent implements dynamic control of the ringing signal by continuously monitoring loop conditions and adjusting the ringing voltage in real-time. The system transitions from static maximum ringing voltage to a dynamic system that adapts ringing parameters based on actual loop characteristics, thereby reducing power dissipation while maintaining adequate ringing voltage when needed.
Solution Approach 2:
The system changes multiple parameters including ringing voltage level, frequency, and duration based on detected loop conditions. By measuring loop voltage drop and power dissipation, the system adjusts these parameters to optimize the balance between delivering sufficient ringing voltage and minimizing excessive power dissipation that causes heat generation.
2Adaptability or versatility
If the SLIC uses resistive feed characteristics to drive heavy REN loads in short loops, then ringing signal is delivered to heavy loads, but current increases compounding power dissipation
Solution Approach 1:
The patent employs feedback control by continuously monitoring loop current, voltage drop, and power dissipation during ringing. The system uses this feedback information to detect when power dissipation exceeds thresholds and to adjust ringing parameters accordingly, creating a closed-loop control system that adapts to heavy REN load conditions and prevents excessive power dissipation.
Solution Approach 2:
The system performs preliminary measurements of loop characteristics before delivering the full ringing signal. By initially measuring voltage drop and power dissipation, the system can predict potential excessive power conditions and preemptively adjust ringing parameters to prevent compounding power dissipation while still delivering adequate ringing to heavy loads.
3Ease of manufacture
If device density is increased to reduce line card cost, then cost-effectiveness improves, but heat generation from power dissipation causes device failures
Solution Approach 1:
The patent converts the potentially harmful effect of power dissipation into a useful measurement parameter. By monitoring power dissipation and using it as feedback to dynamically adjust ringing parameters, the system prevents excessive heat generation that would cause device failures, thereby enabling higher device density while maintaining reliability and cost-effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces SLIC power dissipation, mitigating heat generation and enabling higher device densities while maintaining cost-effectiveness by dynamically controlling ringing voltage and employing adaptive battery selection.
Implementation Method 1
the loop voltage drop is low, resulting in a high voltage drop and consequently high power dissipation in the SLIC
Data Source
AI summary
A method for controlling power dissipated in a subscriber line interface circuit includes measuring a power parameter of the subscriber line interface circuit during a ringing cycle, comparing the measured power parameter to a target power parameter and adjusting at least one ringing parameter of a ringing signal generated by the subscriber line interface circuit based on the comparison. A line card includes a subscriber line interface circuit operable to generate a ringing signal, and a subscriber line audio-processing circuit operable to measure a power parameter of the subscriber line interface circuit during a ringing cycle, compare the measured power parameter to a target power parameter, and adjust at least one ringing parameter of the ringing signal based on the comparison.