PoE Twisted Pair Cables With 22 AWG Conductors and Asymmetric Twist Lays
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Solution Overview
Problem
Existing twisted pair communication cables face challenges in meeting increased power requirements and electrical performance standards, particularly in Power over Ethernet (PoE) applications, due to conductor size limitations and increased bandwidth demands, which affect crosstalk and noise issues.
Innovation Solution
The development of twisted pair communication cables with larger conductors (22 AWG or greater) and varying twist lays to optimize power transmission efficiency and electrical performance, including the use of separators and shield layers to reduce crosstalk and meet Category 6A standards, enabling efficient power delivery and data transmission up to 100 Watts over 100 meters with high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If larger conductor sizes are used to meet increased power requirements, then power transmission capability is improved, but cable complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the conductor size parameter from conventional smaller gauges to 22 AWG or larger, directly increasing power transmission capability while maintaining compatibility with existing PoE standards and infrastructure
Solution Approach 2:
The patent employs composite cable construction combining larger conductors with specific insulation materials, separators, and shield layers to achieve both high power transmission and electrical performance without excessive complexity
2Power
If larger conductor sizes are used to meet increased power requirements, then power transmission capability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent segments the cable construction into distinct functional layers (conductors, insulation, separators, shield layers, jacket) that can be manufactured and assembled independently, facilitating production of cables with larger conductors
Solution Approach 2:
The patent standardizes the conductor size parameter at 22 AWG or larger, which balances power transmission requirements with manufacturability by using commercially available conductor sizes that do not require specialized manufacturing processes
3Speed
If bandwidth requirements increase, then data transmission capability is improved, but crosstalk and noise issues worsen
Solution Approach 1:
The patent employs asymmetric twist lay configurations where different twisted pairs have different twist rates and directions, which helps cancel out crosstalk and noise signals while maintaining high bandwidth capability
Solution Approach 2:
The patent introduces separator elements and shield layers as intermediary components between twisted pairs to physically isolate and electrically shield against crosstalk and noise, enabling high-speed data transmission
4Reliability
If separator and shield layer components are added to reduce crosstalk, then electrical performance is improved, but device complexity increases
Solution Approach 1:
The patent applies separators and shield layers selectively to specific twisted pairs or cable sections where crosstalk and noise are most problematic, rather than uniformly throughout the entire cable, optimizing electrical performance while minimizing added complexity
Data Source
AI summary
A communication cable suitable for Power over Ethernet applications may include a jacket that defines a cable core and a plurality of twisted pairs of conductors disposed within the cable core. Each of the conductors may have a diameter of at least approximately 0.0240 inches or the equivalent of a 22 American Wire Gauge conductor. Additionally, each of the plurality of twisted pairs may have a different twist lay, and the respective twist lays may be selected such that the communications cable satisfies the requirements of a Category 6A cabling standard. The communications cable may have a delay skew of less than approximately 45 nanoseconds per 100 meters and a direct current resistance unbalance between pairs of less than approximately 100 milliohms per 100 meters.