Chained KVM Switching Arrays for Analog Signal Sharing
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Solution Overview
Problem
Conventional KVM switches are limited in connecting and managing multiple computers and input/output devices, and they fail to provide high-quality transmission of analog signals, especially in large-scale systems, leading to increased costs and reduced system performance.
Innovation Solution
A KVM switch with a chain switching array and a local switching array, utilizing crosspoint chips for parallel connections and switches, and an ID auto-setting circuit to manage and prevent simultaneous transmissions to the same destination, allowing high-speed switching of analog signals between multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional KVM switches are used to connect multiple computers and I/O devices, then the number of connected devices is limited by hardware design, but the cost and space requirements increase with more devices
Solution Approach 1:
The system is divided into multiple KVM switch units, each capable of independently switching between a subset of computers and I/O devices. These segmented units can be chained together through daisy-chain connections, allowing the system to scale from small to large configurations without requiring a single complex switch. Each unit maintains its own switching matrix and control logic, enabling modular expansion.
Solution Approach 2:
Multiple KVM switch units are nested in a hierarchical structure where smaller switching matrices are combined through chaining to form larger switching capabilities. The daisy-chain architecture allows output ports of one switch unit to connect to input ports of another, creating a nested configuration where the overall system capacity exceeds that of individual units while maintaining manageable complexity at each level.
2Adaptability or versatility
If multiple KVM switches are connected to manage more devices, then the connection capacity increases, but the analog signal transmission quality deteriorates
Solution Approach 1:
The patent introduces dedicated signal path management and impedance matching circuits as intermediaries between chained KVM switch units. These intermediary components actively maintain signal integrity by compensating for signal degradation over multiple chaining segments, using techniques such as signal boosting, equalization, and controlled impedance routing to preserve analog video and audio quality across extended connections.
Solution Approach 2:
The system dynamically adjusts transmission parameters such as signal level, impedance, and frequency response based on the number of chaining segments and signal type. By changing these parameters adaptively, the system optimizes analog signal transmission quality for each specific configuration, whether one switch unit or multiple units are chained together, preventing signal degradation regardless of system size.
3Adaptability or versatility
If conventional KVM switches are used for large-scale systems, then the system can handle more computers, but the costs of system settings and maintenance increase
Solution Approach 1:
The KVM switch system incorporates automatic discovery and configuration capabilities that eliminate manual setup for each additional unit. When new switch units are chained into the system, they automatically register themselves, negotiate their addresses and capabilities, and integrate into the existing configuration without requiring administrator intervention. This self-service approach maintains ease of operation even as system scale increases to dozens or hundreds of devices.
Solution Approach 2:
The patent implements a universal control interface and standardized chaining protocol that works identically regardless of system size or configuration. The same user interface, connection methods, and control commands function whether managing 4 or 256 devices, reducing the learning curve and operational complexity. This universal design allows administrators to manage large-scale systems with the same simplicity as small systems.
4Adaptability or versatility
If multiple sets of operating devices manage multiple computers simultaneously, then device sharing is achieved, but parallel connection and switching of analog signals becomes difficult
Solution Approach 1:
The patent extends the traditional two-dimensional switching matrix into a three-dimensional switching architecture by adding the chaining dimension. This allows multiple independent switching planes to operate in parallel across chained units, with each unit handling a subset of I/O devices while collectively providing access to all connected computers. The daisy-chain topology adds a spatial dimension that enables parallel signal paths without increasing the complexity of individual switching matrices.
Data Source
AI summary
A local electrical signal and a remote electrical signal are received for switching. When destinations of the local and remote electrical signals are the same local signal input device, only one of them is allowed to be transmitted to the destined local signal input device. When destinations of the local and remote electrical signals are at least one remote signal input device, only one of them is allowed to be transmitted to the destined remote signal input device.