Serial Cable Diagnostic Encoding via Voltage Level Modulation
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Solution Overview
Problem
Existing serial communication cables lack mechanisms to monitor and store diagnostic data, making it difficult to determine whether a communication failure is due to a host or a serial cable, as both can produce similar degradation symptoms.
Innovation Solution
A powered serial communication bus system with modules that include a power interface, controller, memory, and interfaces to encode and decode digital diagnostic data onto a serial data signal, allowing for the transmission and storage of operational characteristics, enabling diagnosis of serial communication bus or link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If serial cables are used for communication between hosts, then communication capability is provided, but the ability to diagnose communication failures is lost
Solution Approach 1:
A diagnostic device is introduced as an intermediary component between hosts and serial cables. This device includes a cable interface that couples to the serial cable and a host interface that couples to the host, allowing it to monitor and diagnose communication signals without disrupting the existing communication function. The intermediary nature enables simultaneous communication and diagnostic capabilities.
Solution Approach 2:
The serial cable itself is equipped with self-diagnostic capabilities through integrated sensors that monitor cable conditions (voltage, current, temperature) and embedded storage that records diagnostic information. This allows the cable to self-monitor and provide diagnostic data about its own operational status without requiring external monitoring equipment.
2Difficulty of detecting and measuring
If diagnostic data is monitored and stored in the serial cable, then diagnostic capability is improved, but the serial cable complexity increases
Solution Approach 1:
The diagnostic functionality is segmented into separate functional modules: sensors for monitoring physical conditions, embedded storage for data recording, and a controller for data management. This modular segmentation allows the diagnostic capabilities to be added without requiring complete redesign of the cable architecture, thereby managing complexity through functional separation.
Solution Approach 2:
The serial cable is designed with multi-functionality, serving both as a communication medium and as a diagnostic device. By integrating sensors, storage, and monitoring capabilities into the cable itself, it performs multiple functions (data transmission and self-diagnosis) without requiring separate dedicated diagnostic equipment, thus managing complexity through functional integration.
3Loss of information
If voltage levels are adjusted to encode diagnostic data, then diagnostic information transmission is enabled, but signal integrity may be compromised
Solution Approach 1:
Diagnostic data is encoded by periodically adjusting voltage levels at specific time intervals during the communication protocol. The voltage controller modifies voltage levels in a periodic manner that aligns with the communication timing, allowing diagnostic information to be embedded without creating continuous interference with the primary data signal, thus preserving signal integrity while enabling information transmission.
Data Source
AI summary
A serial communications device comprises a controller to obtain digital diagnostic data representative of operational characteristics of the serial communications device, memory to store the digital diagnostic data and at least one interface, including an interface to serially communicate data via a serial cable. The serial communications device also comprises a signal controller configured to encode the digital diagnostic data onto a serial data signal for transmission via the serial cable by adjusting signal levels of the serial data signal while preserving original data in the serial data signal. Encoding the digital diagnostic data includes serializing the digital diagnostic data, determining a series of signal levels for the serialized digital diagnostic data based on a signal encoding map, and adjusting signal levels for the serial data signal based on the determined series of signal levels.