Reduced Pair Ethernet Transmission via Interleaving
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Solution Overview
Problem
The existing Gigabit Ethernet transmission systems require four twisted pairs of wires, which increases the size and weight of Ethernet wiring and limits the form-factor of Ethernet interfaces, while also being susceptible to error bursts due to electromagnetic interference (EMI).
Innovation Solution
A reduced pair Ethernet transmission system that uses either one or two twisted pairs of wires, employing a physical layer compatible with IEEE 802.3 standards, utilizing 4D 8-state Trellis-Code Modulation (TCM) and convolutional interleaving to mitigate error bursts by separating code symbols in time, allowing for error correction and maintaining interoperability with standard Gigabit Ethernet systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If four twisted pairs of wires are used for Gigabit Ethernet transmission, then data transmission reliability is improved through inherent error burst mitigation, but the size and weight of Ethernet wiring increases and form-factor is limited
Solution Approach 1:
The patent extracts and removes two of the four twisted pairs from the traditional Gigabit Ethernet configuration, reducing the wiring from four pairs to two pairs. This extraction maintains the essential data transmission function while eliminating the excess wiring that contributes to weight and size, directly resolving the contradiction between reliability and weight.
Solution Approach 2:
The patent merges the data transmission functions that were previously distributed across four separate twisted pairs into a consolidated two-pair configuration. By combining the transmission channels and using advanced modulation techniques, the system achieves the same reliability with fewer physical pairs, thereby reducing weight while maintaining data transmission integrity.
2Reliability
If four twisted pairs of wires are used for Gigabit Ethernet transmission, then error burst mitigation is improved through separate channel transmission, but the device complexity and form-factor are limited
Solution Approach 1:
The patent extracts the error mitigation functionality from the physical separation of four twisted pairs and relocates it to signal processing techniques in the physical layer. By removing two pairs and implementing advanced error correction and interleaving algorithms, the system maintains error burst mitigation capability while reducing the physical complexity and form-factor constraints.
Solution Approach 2:
The patent replaces the mechanical/physical solution of using four separate twisted pairs for error mitigation with an electronic/software-based solution implemented in the physical layer. Through signal processing, error correction codes, and interleaving techniques, the system achieves the same error mitigation effect without the physical complexity of four pairs, thereby reducing form-factor constraints.
3Weight of stationary object
If the number of twisted pairs is reduced to one or two, then the size and weight of Ethernet wiring is minimized, but the system becomes more susceptible to error bursts
Solution Approach 1:
The patent applies preliminary error correction measures by implementing forward error correction (FEC) codes and interleaving techniques before data transmission. These preliminary actions prepare the data stream to withstand potential error bursts that may occur on the reduced two-pair configuration, proactively compensating for the increased susceptibility to EMI and crosstalk.
Solution Approach 2:
The patent implements beforehand cushioning through robust error correction codes and redundancy mechanisms in the physical layer. These cushioning measures are built into the transmission protocol in advance, providing a buffer against error bursts that may affect the reduced two-pair configuration, ensuring that temporary interference does not result in data loss.
Data Source
AI summary
A system for reduced pair Ethernet transmission. The system includes an interleaver that is operable to receive sets of four code symbols from a physical channel sub-layer (PCS) encoder, wherein each code symbol of each set of four code symbols is associated with one of four channels, and interleave the sets of four code symbols to generate a plurality of interleaved code symbols. The system further includes a serializer that is operable to serialize the plurality of interleaved code symbols to generate a plurality of interleaved and serialized code symbols. The system further includes a transmitter that is operable to transmit the plurality of interleaved and serialized code symbols over an Ethernet medium comprising a single twisted pair of wires.