High Speed Data Cable Outer Braid Signal Carrying
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Solution Overview
Problem
The existing high-speed data cables, such as HDMI and DisplayPort cables, are complex and expensive to manufacture due to their numerous wires, some of which are individually shielded, leading to a need for a more economical and simplified design that can effectively carry high-speed differential digital signals and auxiliary signals.
Innovation Solution
A high-speed data cable design featuring dual and split dual shielded cable elements, where the shields are used to carry auxiliary signals and power, reducing the number of wires required, and incorporating a boost device for signal equalization and boosting, while also using the cable braid for carrying certain signals to simplify the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional HDMI/DisplayPort cable construction with multiple individually shielded wires is used, then signal transmission reliability is improved, but manufacturing cost and device complexity increase significantly
Solution Approach 1:
The cable braid, traditionally used only for electromagnetic shielding, is repurposed to carry auxiliary signals (CEC, SCL, SDA, HPD, EDID). This multi-functional use of the braid reduces the need for separate dedicated conductors for these auxiliary functions, thereby simplifying the overall cable construction while maintaining reliable signal transmission for both video/data and auxiliary functions
2Reliability
If multiple individually shielded wires are used to carry auxiliary signals and power, then signal integrity is improved, but manufacturing cost increases
Solution Approach 1:
The individual wire shields are utilized to carry auxiliary signals and power in addition to their primary shielding function. This approach allows the cable to support multiple functions (video transmission, audio transmission, auxiliary control, power delivery) using the same physical infrastructure, thereby reducing manufacturing cost by eliminating the need for additional dedicated conductors
Solution Approach 2:
Multiple functions (shielding and signal carrying) are merged into single components. The shields that were previously used solely for electromagnetic protection are now combined with auxiliary signal transmission and power delivery functions, reducing the total number of separate components needed and simplifying the manufacturing process
3Device complexity
If the cable braid is used to carry auxiliary signals, then wire count is reduced, but signal transmission reliability may be compromised
Solution Approach 1:
The cable structure is designed with different functional zones: the inner shielded pairs are optimized for high-speed differential video signals requiring strict impedance control, while the outer braid is utilized for lower-speed auxiliary signals that are less sensitive to impedance variations. This local differentiation allows each component to operate in its optimal performance range, maintaining overall system reliability while reducing wire count
Data Source
AI summary
A high speed video cable carries signals according to the High-Definition Multimedia Interface (HDMI), and includes a raw cable and may include a boost device. The raw cable includes coaxial lines which are covered by an outer metallic braid. Each of four high speed video signals is carried on the inner conductors of a pair of coaxial lines. Lower speed signals are carried on the galvanically or capacitively coupled shields of a pair of coaxial lines, as well as the braid of the cable.