Self-Terminating Backplane Connector Signal Termination
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Solution Overview
Problem
High-speed backplane connectors continue to transmit data after service cards are removed, causing harmful crosstalk to adjacent active links due to the delay in system software disabling transceivers, which increases link failure rates as data rates increase and modulation schemes transition to higher orders like PAM4.
Innovation Solution
Implementing self-terminating elements within connectors that automatically engage when uncoupled and disengage when coupled, terminating signals to ground when service cards are removed to prevent crosstalk and reduce transition time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system software disables transceivers after service card removal, then signal transmission stops, but harmful crosstalk occurs during the delay period
Solution Approach 1:
The self-terminating element performs signal termination in advance of the software disabling the transceiver. When the service card is removed, the self-terminating element immediately engages to terminate signals on the open link, preventing crosstalk before it can occur during the software delay period. This preliminary action eliminates the harmful window between card removal and transceiver disablement.
2Speed
If transceivers continue transmitting after card removal, then system response time is reduced, but crosstalk noise increases
Solution Approach 1:
The self-terminating element acts as an intermediary between the open link and the transmitting transceiver. It provides a controlled termination path that allows the transceiver to stop transmitting immediately when the service card is removed, eliminating crosstalk while maintaining fast system response. The intermediary mechanism bridges the gap between mechanical card removal and electrical signal cessation.
3Object-affected harmful factors
If self-terminating elements are added to connectors, then crosstalk is reduced, but device complexity increases
Solution Approach 1:
The self-terminating element is merged with the connector structure itself, integrating the termination function directly into the connector housing. The termination element is positioned within the connector body and automatically engages with the contact when the service card is removed, combining multiple functions (connection and termination) into a single integrated component rather than adding separate external termination devices.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Instantaneous termination of signals upon uncoupling service cards reduces crosstalk noise and link failure rates, improving network device performance by ensuring proper signal termination before system software can disable transceivers.
Implementation Method 1
a self-terminating element connected to one of the contact and the ground shroud and configured for engagement with the other of the contact and the ground shroud when in an engaged position with the connector uncoupled from the mating connection to terminate signals transmitted to the connector
Data Source
AI summary
In one embodiment, an apparatus includes a contact contained within a connector configured to couple with a mating connection to provide a communications data path through the connector, a ground shroud extending over a portion of the contact, and a self-terminating element connected to one of the contact and the ground shroud and configured for engagement with the other of the contact and the ground shroud when in an engaged position with the connector uncoupled from the mating connection to terminate signals transmitted to the connector, and disengagement when in a disengaged position with the connector coupled with the mating connection.