Communications Bus Isolator for Fault Segmentation
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Solution Overview
Problem
Communications bus systems are vulnerable to faults and tampering, which can render them inoperable, especially when external cabling is affected, and existing solutions require additional resources or dedicated devices that not all control panels can support.
Innovation Solution
A communications bus line isolator using a passive transparent repeater that automatically isolates internal bus cabling from external cabling, preventing out-of-specification signals from disrupting communication and protecting the control panel from potential noise and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single communications bus is used to transmit signals between control panel and peripheral devices, then system simplicity and cost are reduced, but the system becomes vulnerable to faults and tampering on external cabling that can render the entire bus inoperable
Solution Approach 1:
The patent divides the communications bus into two separate buses: a first communications bus for connecting the control panel to internal devices, and a second communications bus for connecting to external peripheral devices. This segmentation isolates the internal bus from external faults, allowing the control panel to maintain communication with internal devices even when the external bus experiences tampering or interference.
Solution Approach 2:
The patent introduces a communications bus isolator as an intermediary device between the control panel and the second communications bus. This isolator acts as a mediator that blocks out-of-specification signals from the external bus from reaching the control panel, while still allowing legitimate communications to pass through, thus protecting the system without completely isolating external device connectivity.
2Reliability
If a dedicated communications device is added to the control panel to report faults when bus tampering occurs, then system reliability is improved, but device complexity and resource requirements increase
Solution Approach 1:
The control panel's existing communications device is made multi-functional by enabling it to report both normal operational data and fault conditions (such as bus tampering) through the same device. This eliminates the need for a dedicated fault-reporting device, as the existing communications infrastructure is utilized for dual purposes: routine communications and alarm/fault reporting.
Solution Approach 2:
The patent combines the fault reporting function with the existing communications device, merging multiple functions (normal communications and fault reporting) into a single device. This consolidation reduces the overall device count and resource requirements while maintaining the ability to report both operational status and security faults.
3Adaptability or versatility
If external communications bus cabling is used to connect peripheral devices, then system versatility and device connectivity are improved, but the system becomes susceptible to faults and tampering that can disrupt internal communications
Solution Approach 1:
The patent segments the communications infrastructure into internal and external bus systems, allowing peripheral devices to be connected via the external bus while the internal bus remains protected. This physical and logical segmentation enables versatility in connecting external devices without exposing internal communications to external hazards.
Solution Approach 2:
The communications bus isolator serves as an intermediary that selectively filters signals between the external and internal bus systems. It allows legitimate external communications to pass through while blocking out-of-specification signals from external cabling, thus maintaining peripheral device connectivity while protecting against external faults and tampering.
Data Source
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AI summary
A communications bus line isolator is provided. In some embodiments, a first side of the communications bus isolator can be coupled to a first device via first communications bus cabling, a second side of the communications bus isolator can be coupled to a second device via second communications bus cabling, and, when the communications bus isolator detects a fault on or tampering or interference with the second communications bus cabling or the second device, the communications bus isolator can isolate the first communications bus cabling from the second communications bus cabling. In some embodiments, when the first device detects a continuous fault on or continuous tampering or interference with the second communications bus cabling or the second device, the first device can transmit a signal to the communications bus isolator, instructing the communications bus isolator to actively disable receivers on the second side of the communications bus isolator.