Overlapped Tape Telecom Cable for Low Crosstalk and Delay
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Solution Overview
Problem
Conventional telecommunication cables with tape exhibit higher mutual capacitance and propagation delay due to the placement of the tape near specific twisted pairs, leading to bulkiness and increased costs, with existing solutions failing to provide controlled overlapping of the tape over these pairs.
Innovation Solution
A telecommunication cable design featuring a plurality of twisted pairs with at least two tapes helically wrapped around them, where the tapes overlap and are encapsulated by a sheath, with a controlled lay length ratio of 0.8 to 1.2, and optionally using a separator to minimize cross-talk and maintain compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulation thickness of conductors is increased to distant the tape from the specific twisted pair, then the mutual capacitance is stabilized, but the propagation delay increases and the cable becomes bulky and costly
Solution Approach 1:
The patent applies local quality by creating controlled variations in the cable structure at specific locations. Different twisted pairs have different lay lengths (ratio 0.8-1.2), and the tape is positioned to overlap specifically on certain pairs rather than uniformly on all pairs. This localized differentiation allows the tape to be close to some pairs (stabilizing capacitance) without being close to others (avoiding excessive propagation delay and bulkiness).
Solution Approach 2:
The patent changes physical parameters of the cable structure, specifically the lay length of twisted pairs (maintaining ratio 0.8-1.2) and the positioning of the tape. By adjusting these parameters, the patent achieves optimal mutual capacitance stability while controlling propagation delay and cable dimensions, avoiding the need to increase insulation thickness.
2Reliability
If the insulation thickness of conductors is increased to distant the tape from the specific twisted pair, then the mutual capacitance is stabilized, but the cable becomes bulky and costly
Solution Approach 1:
The patent creates localized differentiation where only specific twisted pairs have the tape positioned close to them, while other pairs maintain normal spacing. This selective positioning stabilizes mutual capacitance for critical pairs without increasing the overall cable diameter, avoiding the need to uniformly increase insulation thickness across all conductors.
Solution Approach 2:
By changing the lay length parameters of twisted pairs (ratio 0.8-1.2) and adjusting tape positioning, the patent achieves optimal capacitance stability while maintaining compact cable dimensions. These parameter adjustments eliminate the need for increased insulation thickness that would otherwise be required to distant the tape.
3Device complexity
If conventional tape placement methods are used, then the cable structure is simple, but the tape causes higher mutual capacitance and propagation delay due to uncontrolled overlapping
Solution Approach 1:
The patent introduces specific parameter controls for twisted pair lay lengths (ratio 0.8-1.2) and tape positioning to optimize performance. These controlled parameter variations achieve low propagation delay and stable mutual capacitance while maintaining relatively simple cable construction, avoiding complex multi-layer shielding or increased insulation thickness.
Data Source
AI summary
A telecommunication cable (100) including a plurality of twisted pairs (102) stranded helically around a cable axis, at least two tapes (104, 106) helically wrapped around the plurality of twisted pairs (102) such that that the at least two tapes (104, 106) overlap over the plurality of twisted pair (102), and a sheath (114) encapsulating the at least two tapes (104, 106) wrapped around the plurality of twisted pair (102). In particular, a ratio of first lay length of a first specific twisted pair to second lay length of a second specific twisted pair is in the range of 0.8 to 1.2. Furthermore, a ratio of first lay length of a first specific twisted pair to second lay length of a second specific twisted pair is in the range of 0.5 to 1.5.