Networking Shelf Card Cooling via Segmented Air Paths
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Solution Overview
Problem
Current networking equipment faces challenges in maintaining compliance with specifications like NEBS while supporting high-density card deployment and efficient cooling, as existing systems struggle to optimize card arrangement for maximum cooling effectiveness and minimize backplane trace lengths without compromising card cooling or violating operational requirements.
Innovation Solution
The proposed high-density networking shelf and system utilize separate air paths for different sets of cards with varying depths, featuring recessed portions and strategically placed fans for efficient airflow, ensuring that interface and switch cards are cooled effectively while maintaining full compliance with NEBS standards through front and rear air intake/outtake without side ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cards are arranged vertically in a conventional rack, then compliance with rack standards (19/21/23 inches) is maintained, but cooling effectiveness is reduced and space utilization is inefficient
Solution Approach 1:
The patent transitions from conventional vertical card arrangement to a horizontal card arrangement within a shelf unit. This dimensional change allows for improved airflow patterns and cooling effectiveness while maintaining compliance with rack standards through the overall shelf structure. The horizontal orientation enables better thermal management without increasing rack configuration complexity.
Solution Approach 2:
The system divides the networking equipment into separate shelf units that can be mounted in conventional racks. Each shelf is a self-contained module with its own cooling system, allowing independent optimization of cooling effectiveness while maintaining compliance with overall rack standards. This segmentation enables flexible deployment and simplified thermal management.
2Productivity
If high-density card deployment is implemented, then bandwidth capacity increases, but space allocation and power consumption increase
Solution Approach 1:
Multiple card functions are integrated into consolidated shelf units with shared cooling infrastructure. By merging individual card cooling requirements into a unified shelf-level cooling system, the patent achieves high-density card deployment without linearly increasing space allocation or power consumption. The shared cooling resources improve overall space utilization efficiency.
Solution Approach 2:
The patent optimizes card arrangement parameters within the shelf, including horizontal positioning and depth variations, to maximize density while maintaining adequate cooling airflow. By carefully controlling card placement parameters, high bandwidth capacity is achieved without excessive space or power requirements.
3Temperature
If cards of different depths are used to optimize cooling, then cooling effectiveness improves, but card insertion and removal operations become more complex
Solution Approach 1:
Cards with different depths are positioned in specific locations within the shelf where they provide optimal cooling airflow paths. The shallower cards are placed in positions that allow better airflow access, while deeper cards are positioned where they can be easily accessed for insertion and removal. This localized optimization maintains ease of operation while improving cooling effectiveness.
4Temperature
If separate air paths are implemented for different card sets, then cooling effectiveness improves, but system complexity increases
Solution Approach 1:
The cooling system is segmented into separate air paths for different card sets, with each path independently optimized for its specific card group. This segmentation improves cooling effectiveness by preventing thermal interference between different card types while maintaining manageable system complexity through modular air path design. Each air path can be independently controlled and maintained.
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
This design optimizes card cooling, maintains NEBS compliance, and allows for scalable systems that double in size without compromising backplane trace lengths for communication, while ensuring all cards are flush for easy insertion and removal, enhancing operational efficiency and visibility of indicators.
Implementation Method 1
a first air path for air flow cools the first set a second air path for air flow cools the second set
Data Source
AI summary
A system, a shelf, and a high density platform optimize the physical arrangement of cards to maximize cooling effectiveness and line card pitch while minimizing backplane trace lengths between line interface and switch fabric cards. The shelf and system and associated card arrangement supports scaling to a larger, double-size system that maintains the required length of backplane traces for card communications without compromising card cooling. Advantageously, the shelf and system maintains full NEBS compliance through an arrangement supporting full air intake/outtake through a front and/or back of the shelf or system, i.e. no side ventilation, and includes a false front to ensure all cards (switch fabric and line interface cards) are substantially flush with one another.