Reduced-Pair Twinax Duplex Transmission for 100 Gbps Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional twinax cable systems face challenges in achieving high-speed, low-latency data transmission with low power dissipation, particularly in applications like Storage Area Networks and High Performance Computing, due to limitations in media analog bandwidth and the need for sophisticated coding techniques.
Innovation Solution
The implementation of a system using a reduced number of twinax pairs integrated with a processor and transceiver for digital signal processing, enabling full-duplex communication at speeds greater than 100 Gbps over four or less twinax copper pairs, with the option for passive or active cable configurations and power management through integrated processors or external power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional twinax cable systems use traditional baseband digital communication to achieve low latency and low power dissipation, then power consumption is reduced, but media analog bandwidth capacity is insufficient for high data rates
Solution Approach 1:
The patent changes the fundamental transmission parameter from baseband digital communication to pass-through PAM4 (Pulse Amplitude Modulation with 4 levels) signaling. This parameter change enables the cable to support higher data rates (100 Gbps and above) while maintaining low power dissipation, as the PAM4 scheme is more power-efficient at high speeds compared to traditional modulation schemes
2Speed
If twinax cable systems support 10 Gbps data communication with sufficient analog bandwidth, then data rate is achieved, but cable design and coding become complex to address performance parameters
Solution Approach 1:
The patent extracts the complex signal processing functions from the cable itself and relocates them to the end devices (transceivers). The cable becomes a simple passive or active transmission medium without embedded coding/decoding complexity, while the transceivers handle all the sophisticated PAM4 signal processing, equalization, and error correction algorithms
Solution Approach 2:
Instead of placing intelligence and complexity in the cable (as in traditional adaptive equalization and coding schemes), the patent inverts the architecture by making the cable dumb/passive and concentrating all smart functions in the end devices. This inversion simplifies cable design while maintaining high performance through advanced transceiver capabilities
3Productivity
If twinax cable systems use reduced pairs for high-speed transmission, then bandwidth capacity is optimized, but achieving full-duplex communication at speeds greater than 100 Gbps becomes challenging
Solution Approach 1:
The patent transitions from traditional single-direction baseband signaling to bidirectional PAM4 signaling across the same reduced cable pairs. By utilizing multiple voltage levels (4 levels in PAM4) and advanced signal processing dimensions, the system achieves 100 Gbps+ full-duplex communication over fewer pairs, effectively adding capacity in the signal dimension rather than requiring more physical pairs
Data Source
AI summary
Cable systems and assemblies integrate a reduced number of twin axial copper pairs to transmit and received in a full-duplex transmission signals at transmission speeds greater than or equal to one hundred Giga bytes per second. The reduced number of twin axial copper pairs comprise four or less twin axial copper pairs, in which each pair forms a single twin axial full-duplex cable for passive or active communication of the signals. A processor can be integrated with the twin axial copper pairs operate to encode the signals for fast transmission speeds.