GTL Backplane Bus Diode Isolation for Termination Card Faults

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Solution Overview

Problem

Redundant GTL backplane buses face reliability issues due to potential open or short circuit failures in termination cards, leading to unequal termination voltages and impaired data communication, especially when inactive cards are inserted, causing voltage levels to drop below operational thresholds.

Innovation Solution

Incorporating isolation components in series between backplane connections and termination voltage sources to prevent current flow, providing fault isolation and maintaining voltage levels even if one termination card fails or is inserted incorrectly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If redundant termination cards are used to improve system reliability, then system availability is improved, but voltage instability and communication failures occur when inactive cards are inserted or fail

Engineering Contradiction:

Improvesystem availabilityVSAvoidtermination voltage stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

Diode isolation components are introduced as intermediary elements between the termination cards and the GTL bus. These diodes act as mediators that allow the active termination card to drive the bus while blocking any harmful current paths from the inactive termination card, thus preventing voltage instability without compromising the redundancy architecture

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical connection between termination cards and the GTL bus is segmented into separate, isolated paths using diode isolation. Each termination card operates in an electrically independent path, preventing interference between active and inactive cards while maintaining the ability to switch between them for redundancy

Inventive Principle:

Principle #1Segmentation

2Reliability

If inactive termination cards are connected to the bus for redundancy, then fault tolerance is improved, but current flow from inactive cards causes voltage drops below operational thresholds

Engineering Contradiction:

Improvefault toleranceVSAvoidbus voltage level

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Diode isolation components serve as intermediary elements that control current flow between the inactive termination card and the GTL bus. The diodes permit voltage levels to be maintained by blocking reverse current flow from the inactive card while allowing the active card to drive the bus, thus preventing voltage drops below operational thresholds

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful current flow path from inactive termination cards is extracted or removed from the system by using diode isolation to block these current paths. This extraction eliminates the source of voltage drops while preserving the beneficial redundancy capability

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS7675325B2GTL backplane bus with improved reliability

Publication Date: 2010.03.09 WSOU INVESTMENTS LLC

AI summary

Isolation components such as p-n junction or Schottky diodes are provided at pull-up resistors of each signal line of a Gunning Transceiver Logic (GTL) backplane bus in an electronic system for improved reliability, specifically to prevent momentary termination of the bus to ground when a circuit card incorporating the pull-up resistors is inserted into the system.