Untwisted Screened Cable Pairs for High-Speed Crosstalk Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing data transmission cables, such as Category 8 cables, experience distortion effects that limit the use of common mode for high-speed data transmission, preventing further increases in data rate without reducing maximum reach.
Innovation Solution
A data transmission cable design featuring untwisted balanced pairs with a metallic screen surrounding each conductor, allowing simultaneous operation in both differential and common modes, and differing structural parameters between pairs to reduce crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Cat8 cable design is used to increase bandwidth and data rate, then data rate increases, but maximum reach is significantly reduced
Solution Approach 1:
The cable structure is segmented into four separate balanced untwisted pairs, each surrounded by its own metallic screen. This segmentation isolates each pair's electromagnetic field, reducing crosstalk and allowing higher data rates to be achieved without proportionally increasing signal attenuation, thereby extending maximum reach.
Solution Approach 2:
A metallic screen is introduced as an intermediary element between each conductor pair and the external environment. This screen acts as a shield that blocks electromagnetic interference from external sources and contains the electromagnetic fields generated by each pair, reducing distortion effects and enabling both common and differential mode operation at high speeds over longer distances.
2Productivity
If conventional balanced twisted pairs are used, then noise and interference are reduced, but data rate cannot exceed 40 Gbps due to distortion effects
Solution Approach 1:
The cable design creates an asymmetric configuration where each of the four conductors is individually screened, while the pairs themselves remain balanced. This asymmetric screening approach allows each conductor to operate independently in both common and differential modes, eliminating the distortion effects that limit conventional balanced pairs to 40 Gbps while maintaining noise reduction benefits.
Solution Approach 2:
Each balanced untwisted pair is designed to support multiple transmission modes simultaneously - both differential mode (for noise rejection) and common mode (for additional data channels). This multi-functionality allows the cable to achieve data rates up to 80 Gbps by utilizing both modes, whereas conventional cables can only effectively use differential mode.
3Object-generated harmful factors
If metallic screen is added around each conductor, then crosstalk is reduced, but device complexity increases
Solution Approach 1:
Instead of applying a single complex shielding structure to the entire cable or to twisted pairs, the solution applies localized metallic screens around each individual conductor. This local quality approach provides targeted crosstalk reduction at each conductor level while maintaining overall cable simplicity and manufacturability.
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
The cable achieves data rates up to 80 Gbps with a maximum reach greater than 30 meters, doubling the data transmission rate without reducing the maximum length, by effectively managing crosstalk through unbalanced untwisted pairs and metallic screening.
Implementation Method 1
a metallic screen separating and at least partially surrounding each of said first, second, third and fourth insulated conductor
Implementation Method 2
the insulated conductors of each pair being untwisted one another, and including a metallic screen wrapped around each insulated conductor
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Data transmission cable (300) comprising: a first balanced untwisted cable pair (100) including a first insulated conductor (1) comprising a first conductor (5) surrounded by a first insulation layer (6), and a second insulated conductor (4) comprising a second conductor (14) surrounded by a second in insulation layer (15); at least one second balanced untwisted cable pair (200) including a third insulated conductor (3) comprising a third conductor (9) surrounded by a third insulation layer (10), and a fourth insulated conductor (2) comprising a fourth conductor (7) surrounded by a fourth insulation layer (8); wherein: the cable further comprises a metallic screen (11) separating and at least partially surrounding each of said first, second, third and fourth insulated conductor (1, 4, 3, 2); and the first balanced untwisted cable pair (100) is configured to be unbalanced with respect to the second balanced untwisted cable pair (200).