Compact USB Repeater Assembly for Aircraft Entertainment Systems
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Solution Overview
Problem
Current USB technologies for in-flight entertainment systems are limited to five-meter cable lengths, and existing USB repeaters are bulky, unreliable, and fail to meet aerospace regulations for weight and robustness, limiting the range and reliability of USB connections between the personal control unit (PCU) and the seat electronics box (SEB).
Innovation Solution
A compact, lightweight USB repeater/hub assembly that extends USB connectivity beyond five meters by using a USB repeater assembly with industrial-grade components, including a host and device connector, USB repeater circuitry, and a conductive shell for shielding, designed to meet aerospace regulations and accommodate additional signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If USB cable length is extended beyond five meters, then the range of USB connectivity is improved, but communication reliability deteriorates
Solution Approach 1:
A USB repeater assembly is introduced as an intermediary device between the personal control unit (PCU) and the seat electronics box (SEB). The repeater receives USB signals from the PCU, regenerates and retransmits them to the SEB, thereby extending the effective communication distance beyond the standard five-meter USB cable limitation while maintaining signal integrity and communication reliability
Solution Approach 2:
The USB communication path is segmented into multiple sections: PCU to repeater, repeater to SEB, and repeater internal signal regeneration stages. This segmentation allows each segment to operate within reliable signal transmission parameters while the overall system achieves extended range through the intermediate repeater node
2Length of moving object
If known USB repeaters are used to extend USB range, then connectivity range is improved, but weight and size increase
Solution Approach 1:
The USB repeater assembly is designed with modified physical parameters including compact housing dimensions, lightweight materials, and minimized component footprint. These parameter changes enable the repeater to extend USB connectivity range while maintaining weight and size suitable for aircraft applications where payload mass is critical
Solution Approach 2:
The repeater employs a compact, thin-profile housing design that encloses all necessary USB repeater circuitry in a space-efficient manner. This shell design reduces overall device volume and weight while providing necessary mechanical protection and structural integrity
3Length of moving object
If known USB repeaters are used to extend USB range, then connectivity range is improved, but robustness and reliability for aerospace applications deteriorate
Solution Approach 1:
The USB repeater assembly incorporates pre-installed protective elements including electrostatic discharge (ESD) protection circuits, electromagnetic interference (EMI) shielding, and mechanical shock resistance features. These cushioning measures are built into the design beforehand to protect against the harsh aerospace environment, ensuring reliable operation during flight conditions without requiring post-deployment modifications
Solution Approach 2:
The repeater is designed to operate reliably in the inert aerospace environment by incorporating EMI/RFI shielding, grounding schemes, and ESD protection that create an electrically stable internal environment. This protects sensitive USB circuitry from external electromagnetic disturbances common in aircraft environments, maintaining signal integrity and system reliability
4Weight of stationary object
If SEB is located further away from passenger seat, then space and weight are saved, but USB connection reliability deteriorates
Solution Approach 1:
The USB repeater serves as a mediator that enables reliable USB communication over the extended distance between the relocated SEB and the PCU. By placing repeaters at strategic locations in the cabling path, the system maintains signal integrity across the longer physical separation, allowing SEB consolidation for weight and space savings without sacrificing connection reliability
Data Source
AI summary
A USB repeater assembly is provided for connecting a vehicle passenger entertainment system to a seat electronics box that may be at some distance from the entertainment system. The assembly comprises a host connector that connects with the seat electronics box and a device connector that connects with the passenger entertainment system. The passenger entertainment system comprises a USB personal control unit. The repeater assembly is housed within a shell, preferably a hardened one, enclosing a portion of the connectors as well as USB repeater circuitry and through-connects for connections associated with other components of the passenger entertainment system.