Optical Link Signal Communication Protocol Adaptation
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Solution Overview
Problem
Existing systems fail to efficiently transmit low-speed signals over optical fibers due to incompatibilities between DisplayPort and HDMI protocols, leading to communication bottlenecks and delays, particularly with AUX+, AUX-, SDA, SCL, and CEC signals, which are crucial for real-time functions like I2C and HDCP.
Innovation Solution
The implementation of a source and sink interface that analyzes configuration signals to determine the protocol mode and prioritizes communication direction, enabling seamless transmission of low-speed DP or HDMI signals over optical links, ensuring wire-speed forwarding and compatibility between DP and HDMI protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fiber optic communication is used to transmit low-speed signals, then data transmission rate is improved, but compatibility between DP and HDMI protocols deteriorates
Solution Approach 1:
The optical interface is designed to support multiple protocols (DP and HDMI) by implementing a unified signal transmission mechanism. The system can dynamically identify and adapt to different protocol types, allowing the same physical interface to handle both DP AUX+/AUX- signals and HDMI SDA/SCL/CEC signals, thereby achieving multi-functionality and protocol compatibility while maintaining high transmission rates over optical fibers.
Solution Approach 2:
The system changes transmission parameters dynamically based on the detected protocol type. When DP protocol is detected, the interface configures itself to handle AUX+/AUX- differential signaling; when HDMI protocol is detected, it switches to handling SDA/SCL/CEC single-ended signaling. This parameter adaptation allows the optical interface to maintain compatibility across different protocols while preserving high-speed transmission capabilities.
2Device complexity
If half-duplex communication mode is used for AUX+/AUX- signals, then device complexity is reduced, but communication delay increases
Solution Approach 1:
The system implements periodic polling and time-division multiplexing for half-duplex optical communication. By establishing regular communication intervals and using structured packet-based data exchange, the system efficiently manages bidirectional communication over the same channel. This periodic action reduces idle waiting time and optimizes the use of the shared communication resource, minimizing delays while maintaining simple half-duplex hardware architecture.
3Adaptability or versatility
If store-and-forward mode is used for AUX communication, then protocol compatibility is improved, but response delay increases
Solution Approach 1:
The system extracts and processes protocol-specific control signals separately from the main data stream. By identifying and handling protocol type indicators early in the communication process, the system can dynamically switch between DP and HDMI protocol modes without requiring complete store-and-forward buffering of all data. This extraction approach enables faster protocol adaptation and reduces overall response delay while maintaining compatibility.
Solution Approach 2:
The system performs preliminary protocol identification and configuration before full data transmission begins. By detecting the protocol type upfront and pre-configuring the appropriate transmission parameters and signal handling modes, the system avoids delays that would occur during mid-transmission protocol switching. This preliminary action ensures both compatibility and responsive performance.
Data Source
AI summary
Systems and methods for signal communication over an optical link are described. One aspect includes receiving a source CONFIG1 signal from a DP master device and a sink CONFIG1 signal from a sink terminal. The source and sink CONFIG1 signals are analyzed. It is determined whether a signal transmission mode is a DP protocol. For a DP protocol, a pair of source AUX signals is received from the DP master device. A pair of sink AUX signals is received from the sink terminal. Communication resource contention between the source and sink AUX signals is identified. A communication direction of the communication resources is transitioned to give the source AUX signals precedence over the sink AUX signals. The source AUX signals are transferred to the sink terminal via the communication resources. The direction of the communication resources is again transitioned. The sink AUX signals are transferred to the DP master device.