Optical Rack-Cluster Links for Long-Reach High-Bandwidth Switching
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Solution Overview
Problem
High-bandwidth copper cables used in data centers have high loss per unit length, limiting the number of racks that can be directly connected to a single switch, which restricts communication efficiency and scalability.
Innovation Solution
Implementing an optical communication system using dual-mode optical switches and optical fibers to connect sleds within data centers, enabling high-bandwidth, low-latency connections across multiple racks through a unified network architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If copper cables are used for high-bandwidth communication, then communication bandwidth is improved, but cable length is limited due to high loss per unit length
Solution Approach 1:
The patent introduces optical cables as an intermediary medium to replace copper cables for connections exceeding the copper cable length limit. Optical cables serve as a mediator that enables long-distance, high-bandwidth communication without the signal loss constraints of copper cables, while copper cables continue to be used for shorter connections where they remain effective.
2Loss of energy
If copper cables with limited length are used, then cable loss is controlled, but the number of racks that can be directly connected to a single switch is limited
Solution Approach 1:
The patent creates a universal communication infrastructure that supports both copper and optical cable connections. The system can adaptively select the appropriate cable type based on distance requirements, enabling a single switch to connect to a larger number of racks by using optical cables for distant connections and copper cables for nearby connections, thus increasing overall system versatility.
3Adaptability or versatility
If optical communication system is implemented, then scalability and connectivity are improved, but system complexity increases
Solution Approach 1:
The patent implements a dynamic cable selection mechanism where the system automatically chooses between copper and optical cables based on the specific connection requirements. This dynamic adaptation allows the system to scale efficiently without requiring complex manual configuration, as the system intelligently determines the optimal cable type for each connection scenario.
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 solution allows for increased scalability and performance by enabling longer cable lengths and improved connectivity among sleds, supporting both Ethernet and high-performance computing protocols, while allowing for dynamic resource pooling and efficient maintenance automation.
Implementation Method 1
Implementing an optical communication system using dual-mode optical switches and optical fibers to connect sleds within data centers
Data Source
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AI summary
Technologies for optical communication in a rack cluster in a data center are disclosed. In the illustrative embodiment, a network switch is connected to each of 1,024 sleds by an optical cable that enables communication at a rate of 200 gigabits per second. The optical cable has low loss, allowing for long cable lengths, which in turn allows for connecting to a large number of sleds. The optical cable also has a very high intrinsic bandwidth limit, allowing for the bandwidth to be upgraded without upgrading the optical infrastructure.